Ticker   | 
                                    Series  | 
                                    Reference Asset  | 
                                    Benchmark  | 
                                    Predetermined Net Cap  | 
                                    Net Return  | 
                                    Reference Asset Return  | 
                                    Beta  | 
                                    Standard Deviation  | 
                                    Reference Asset Standard Deviation  | 
                                    Max Drawdown  | 
                                    Reference Asset Max Drawdown  | 
                                    Period Start Date  | 
                                    Period End Date  | 
                                
                    
                        
                            | 
                                AUGM
                                AUGM
                                FT Vest U.S. Equity Max Buffer ETF - August
                             | 
                            
                                August
                             | 
                            
                                SPY
                             | 
                            
                                S&P 500® Index
                             | 
                            
                                7.17%
                             | 
                            
                                7.22%
                             | 
                            
                                16.08%
                             | 
                            
                                0.22
                             | 
                            
                                4.40%
                             | 
                            
                                19.78%
                             | 
                            
                                -4.25%
                             | 
                            
                                -19.00%
                             | 
                            
                                08/19/24
                             | 
                            
                                08/15/25
                             | 
                        
                    
                        
                            | 
                                DAPR
                                DAPR
                                FT Vest U.S. Equity Deep Buffer ETF - April
                             | 
                            
                                April
                             | 
                            
                                SPY
                             | 
                            
                                S&P 500® Index
                             | 
                            
                                6.65%
                             | 
                            
                                4.14%
                             | 
                            
                                4.92%
                             | 
                            
                                0.44
                             | 
                            
                                7.13%
                             | 
                            
                                15.19%
                             | 
                            
                                -5.00%
                             | 
                            
                                -12.87%
                             | 
                            
                                04/19/21
                             | 
                            
                                04/14/22
                             | 
                        
                    
                        
                            | 
                                DAPR
                                DAPR
                                FT Vest U.S. Equity Deep Buffer ETF - April
                             | 
                            
                                April
                             | 
                            
                                SPY
                             | 
                            
                                S&P 500® Index
                             | 
                            
                                10.09%
                             | 
                            
                                -5.70%
                             | 
                            
                                -5.85%
                             | 
                            
                                0.41
                             | 
                            
                                9.85%
                             | 
                            
                                23.10%
                             | 
                            
                                -9.01%
                             | 
                            
                                -19.88%
                             | 
                            
                                04/18/22
                             | 
                            
                                04/21/23
                             | 
                        
                    
                        
                            | 
                                DAPR
                                DAPR
                                FT Vest U.S. Equity Deep Buffer ETF - April
                             | 
                            
                                April
                             | 
                            
                                SPY
                             | 
                            
                                S&P 500® Index
                             | 
                            
                                13.20%
                             | 
                            
                                13.27%
                             | 
                            
                                20.13%
                             | 
                            
                                0.38
                             | 
                            
                                5.48%
                             | 
                            
                                11.84%
                             | 
                            
                                -4.85%
                             | 
                            
                                -10.29%
                             | 
                            
                                04/24/23
                             | 
                            
                                04/19/24
                             | 
                        
                    
                        
                            | 
                                DAPR
                                DAPR
                                FT Vest U.S. Equity Deep Buffer ETF - April
                             | 
                            
                                April
                             | 
                            
                                SPY
                             | 
                            
                                S&P 500® Index
                             | 
                            
                                14.66%
                             | 
                            
                                5.52%
                             | 
                            
                                6.31%
                             | 
                            
                                0.61
                             | 
                            
                                12.55%
                             | 
                            
                                19.72%
                             | 
                            
                                -10.66%
                             | 
                            
                                -19.00%
                             | 
                            
                                04/22/24
                             | 
                            
                                04/17/25
                             | 
                        
                    
                        
                            | 
                                DAUG
                                DAUG
                                FT Vest U.S. Equity Deep Buffer ETF - August
                             | 
                            
                                August
                             | 
                            
                                SPY
                             | 
                            
                                S&P 500® Index
                             | 
                            
                                5.90%
                             | 
                            
                                5.98%
                             | 
                            
                                10.54%
                             | 
                            
                                0.45
                             | 
                            
                                17.27%
                             | 
                            
                                35.87%
                             | 
                            
                                -15.23%
                             | 
                            
                                -34.10%
                             | 
                            
                                11/07/19
                             | 
                            
                                08/21/20
                             | 
                        
                    
                        
                            | 
                                DAUG
                                DAUG
                                FT Vest U.S. Equity Deep Buffer ETF - August
                             | 
                            
                                August
                             | 
                            
                                SPY
                             | 
                            
                                S&P 500® Index
                             | 
                            
                                7.78%
                             | 
                            
                                7.86%
                             | 
                            
                                30.60%
                             | 
                            
                                0.31
                             | 
                            
                                8.44%
                             | 
                            
                                14.98%
                             | 
                            
                                -3.26%
                             | 
                            
                                -9.80%
                             | 
                            
                                08/24/20
                             | 
                            
                                08/20/21
                             | 
                        
                    
                        
                            | 
                                DAUG
                                DAUG
                                FT Vest U.S. Equity Deep Buffer ETF - August
                             | 
                            
                                August
                             | 
                            
                                SPY
                             | 
                            
                                S&P 500® Index
                             | 
                            
                                6.52%
                             | 
                            
                                -5.56%
                             | 
                            
                                -4.79%
                             | 
                            
                                0.37
                             | 
                            
                                8.23%
                             | 
                            
                                20.71%
                             | 
                            
                                -9.30%
                             | 
                            
                                -23.41%
                             | 
                            
                                08/23/21
                             | 
                            
                                08/19/22
                             | 
                        
                    
                        
                            | 
                                DAUG
                                DAUG
                                FT Vest U.S. Equity Deep Buffer ETF - August
                             | 
                            
                                August
                             | 
                            
                                SPY
                             | 
                            
                                S&P 500® Index
                             | 
                            
                                13.62%
                             | 
                            
                                2.68%
                             | 
                            
                                3.40%
                             | 
                            
                                0.55
                             | 
                            
                                10.87%
                             | 
                            
                                18.69%
                             | 
                            
                                -8.11%
                             | 
                            
                                -15.54%
                             | 
                            
                                08/22/22
                             | 
                            
                                08/18/23
                             | 
                        
                    
                        
                            | 
                                DAUG
                                DAUG
                                FT Vest U.S. Equity Deep Buffer ETF - August
                             | 
                            
                                August
                             | 
                            
                                SPY
                             | 
                            
                                S&P 500® Index
                             | 
                            
                                14.39%
                             | 
                            
                                14.45%
                             | 
                            
                                26.99%
                             | 
                            
                                0.38
                             | 
                            
                                5.63%
                             | 
                            
                                12.56%
                             | 
                            
                                -5.25%
                             | 
                            
                                -8.98%
                             | 
                            
                                08/21/23
                             | 
                            
                                08/16/24
                             | 
                        
                    
                        
                            | 
                                DAUG
                                DAUG
                                FT Vest U.S. Equity Deep Buffer ETF - August
                             | 
                            
                                August
                             | 
                            
                                SPY
                             | 
                            
                                S&P 500® Index
                             | 
                            
                                11.85%
                             | 
                            
                                11.93%
                             | 
                            
                                16.08%
                             | 
                            
                                0.56
                             | 
                            
                                10.74%
                             | 
                            
                                19.78%
                             | 
                            
                                -10.47%
                             | 
                            
                                -19.00%
                             | 
                            
                                08/19/24
                             | 
                            
                                08/15/25
                             | 
                        
                    
                        
                            | 
                                DDEC
                                DDEC
                                FT Vest U.S. Equity Deep Buffer ETF - December
                             | 
                            
                                December
                             | 
                            
                                SPY
                             | 
                            
                                S&P 500® Index
                             | 
                            
                                7.15%
                             | 
                            
                                7.21%
                             | 
                            
                                24.57%
                             | 
                            
                                0.26
                             | 
                            
                                3.98%
                             | 
                            
                                12.90%
                             | 
                            
                                -1.78%
                             | 
                            
                                -5.42%
                             | 
                            
                                12/21/20
                             | 
                            
                                12/17/21
                             | 
                        
                    
                        
                            | 
                                DDEC
                                DDEC
                                FT Vest U.S. Equity Deep Buffer ETF - December
                             | 
                            
                                December
                             | 
                            
                                SPY
                             | 
                            
                                S&P 500® Index
                             | 
                            
                                7.25%
                             | 
                            
                                -5.74%
                             | 
                            
                                -16.66%
                             | 
                            
                                0.30
                             | 
                            
                                8.32%
                             | 
                            
                                24.23%
                             | 
                            
                                -9.94%
                             | 
                            
                                -25.36%
                             | 
                            
                                12/20/21
                             | 
                            
                                12/16/22
                             | 
                        
                    
                        
                            | 
                                DDEC
                                DDEC
                                FT Vest U.S. Equity Deep Buffer ETF - December
                             | 
                            
                                December
                             | 
                            
                                SPY
                             | 
                            
                                S&P 500® Index
                             | 
                            
                                15.83%
                             | 
                            
                                15.90%
                             | 
                            
                                22.45%
                             | 
                            
                                0.51
                             | 
                            
                                7.36%
                             | 
                            
                                13.45%
                             | 
                            
                                -5.58%
                             | 
                            
                                -10.29%
                             | 
                            
                                12/19/22
                             | 
                            
                                12/15/23
                             | 
                        
                    
                        
                            | 
                                DDEC
                                DDEC
                                FT Vest U.S. Equity Deep Buffer ETF - December
                             | 
                            
                                December
                             | 
                            
                                SPY
                             | 
                            
                                S&P 500® Index
                             | 
                            
                                13.49%
                             | 
                            
                                13.55%
                             | 
                            
                                25.96%
                             | 
                            
                                0.34
                             | 
                            
                                4.88%
                             | 
                            
                                12.49%
                             | 
                            
                                -3.24%
                             | 
                            
                                -8.41%
                             | 
                            
                                12/18/23
                             | 
                            
                                12/20/24
                             | 
                        
                    
                        
                            | 
                                DFEB
                                DFEB
                                FT Vest U.S. Equity Deep Buffer ETF - February
                             | 
                            
                                February
                             | 
                            
                                SPY
                             | 
                            
                                S&P 500® Index
                             | 
                            
                                6.65%
                             | 
                            
                                6.76%
                             | 
                            
                                16.96%
                             | 
                            
                                0.44
                             | 
                            
                                16.32%
                             | 
                            
                                33.77%
                             | 
                            
                                -15.36%
                             | 
                            
                                -33.14%
                             | 
                            
                                02/24/20
                             | 
                            
                                02/19/21
                             | 
                        
                    
                        
                            | 
                                DFEB
                                DFEB
                                FT Vest U.S. Equity Deep Buffer ETF - February
                             | 
                            
                                February
                             | 
                            
                                SPY
                             | 
                            
                                S&P 500® Index
                             | 
                            
                                8.00%
                             | 
                            
                                8.04%
                             | 
                            
                                11.33%
                             | 
                            
                                0.28
                             | 
                            
                                4.73%
                             | 
                            
                                14.08%
                             | 
                            
                                -1.75%
                             | 
                            
                                -9.73%
                             | 
                            
                                02/22/21
                             | 
                            
                                02/18/22
                             | 
                        
                    
                        
                            | 
                                DFEB
                                DFEB
                                FT Vest U.S. Equity Deep Buffer ETF - February
                             | 
                            
                                February
                             | 
                            
                                SPY
                             | 
                            
                                S&P 500® Index
                             | 
                            
                                8.45%
                             | 
                            
                                -5.73%
                             | 
                            
                                -6.21%
                             | 
                            
                                0.39
                             | 
                            
                                9.80%
                             | 
                            
                                23.97%
                             | 
                            
                                -9.36%
                             | 
                            
                                -22.75%
                             | 
                            
                                02/22/22
                             | 
                            
                                02/17/23
                             | 
                        
                    
                        
                            | 
                                DFEB
                                DFEB
                                FT Vest U.S. Equity Deep Buffer ETF - February
                             | 
                            
                                February
                             | 
                            
                                SPY
                             | 
                            
                                S&P 500® Index
                             | 
                            
                                14.12%
                             | 
                            
                                14.20%
                             | 
                            
                                22.65%
                             | 
                            
                                0.51
                             | 
                            
                                7.04%
                             | 
                            
                                12.53%
                             | 
                            
                                -5.75%
                             | 
                            
                                -10.29%
                             | 
                            
                                02/21/23
                             | 
                            
                                02/16/24
                             | 
                        
                    
                        
                            | 
                                DFEB
                                DFEB
                                FT Vest U.S. Equity Deep Buffer ETF - February
                             | 
                            
                                February
                             | 
                            
                                SPY
                             | 
                            
                                S&P 500® Index
                             | 
                            
                                14.19%
                             | 
                            
                                14.25%
                             | 
                            
                                20.11%
                             | 
                            
                                0.42
                             | 
                            
                                5.94%
                             | 
                            
                                12.75%
                             | 
                            
                                -4.18%
                             | 
                            
                                -8.41%
                             | 
                            
                                02/20/24
                             | 
                            
                                02/21/25
                             | 
                        
                    
                        
                            | 
                                DJAN
                                DJAN
                                FT Vest U.S. Equity Deep Buffer ETF - January
                             | 
                            
                                January
                             | 
                            
                                SPY
                             | 
                            
                                S&P 500® Index
                             | 
                            
                                7.34%
                             | 
                            
                                7.38%
                             | 
                            
                                16.58%
                             | 
                            
                                0.25
                             | 
                            
                                3.97%
                             | 
                            
                                13.43%
                             | 
                            
                                -1.74%
                             | 
                            
                                -8.32%
                             | 
                            
                                01/19/21
                             | 
                            
                                01/21/22
                             | 
                        
                    
                        
                            | 
                                DJAN
                                DJAN
                                FT Vest U.S. Equity Deep Buffer ETF - January
                             | 
                            
                                January
                             | 
                            
                                SPY
                             | 
                            
                                S&P 500® Index
                             | 
                            
                                8.18%
                             | 
                            
                                -5.74%
                             | 
                            
                                -9.61%
                             | 
                            
                                0.36
                             | 
                            
                                9.42%
                             | 
                            
                                24.34%
                             | 
                            
                                -9.49%
                             | 
                            
                                -22.75%
                             | 
                            
                                01/24/22
                             | 
                            
                                01/20/23
                             | 
                        
                    
                        
                            | 
                                DJAN
                                DJAN
                                FT Vest U.S. Equity Deep Buffer ETF - January
                             | 
                            
                                January
                             | 
                            
                                SPY
                             | 
                            
                                S&P 500® Index
                             | 
                            
                                13.85%
                             | 
                            
                                13.93%
                             | 
                            
                                21.86%
                             | 
                            
                                0.48
                             | 
                            
                                6.73%
                             | 
                            
                                12.81%
                             | 
                            
                                -5.30%
                             | 
                            
                                -10.29%
                             | 
                            
                                01/23/23
                             | 
                            
                                01/19/24
                             | 
                        
                    
                        
                            | 
                                DJAN
                                DJAN
                                FT Vest U.S. Equity Deep Buffer ETF - January
                             | 
                            
                                January
                             | 
                            
                                SPY
                             | 
                            
                                S&P 500® Index
                             | 
                            
                                13.09%
                             | 
                            
                                13.15%
                             | 
                            
                                23.87%
                             | 
                            
                                0.35
                             | 
                            
                                5.22%
                             | 
                            
                                12.78%
                             | 
                            
                                -3.59%
                             | 
                            
                                -8.41%
                             | 
                            
                                01/22/24
                             | 
                            
                                01/17/25
                             | 
                        
                    
                        
                            | 
                                DJUL
                                DJUL
                                FT Vest U.S. Equity Deep Buffer ETF - July
                             | 
                            
                                July
                             | 
                            
                                SPY
                             | 
                            
                                S&P 500® Index
                             | 
                            
                                7.55%
                             | 
                            
                                7.66%
                             | 
                            
                                34.07%
                             | 
                            
                                0.26
                             | 
                            
                                4.33%
                             | 
                            
                                14.96%
                             | 
                            
                                -2.68%
                             | 
                            
                                -9.80%
                             | 
                            
                                07/20/20
                             | 
                            
                                07/16/21
                             | 
                        
                    
                        
                            | 
                                DJUL
                                DJUL
                                FT Vest U.S. Equity Deep Buffer ETF - July
                             | 
                            
                                July
                             | 
                            
                                SPY
                             | 
                            
                                S&P 500® Index
                             | 
                            
                                6.45%
                             | 
                            
                                -5.80%
                             | 
                            
                                -10.71%
                             | 
                            
                                0.37
                             | 
                            
                                8.03%
                             | 
                            
                                20.09%
                             | 
                            
                                -9.47%
                             | 
                            
                                -23.41%
                             | 
                            
                                07/19/21
                             | 
                            
                                07/15/22
                             | 
                        
                    
                        
                            | 
                                DJUL
                                DJUL
                                FT Vest U.S. Equity Deep Buffer ETF - July
                             | 
                            
                                July
                             | 
                            
                                SPY
                             | 
                            
                                S&P 500® Index
                             | 
                            
                                14.16%
                             | 
                            
                                14.24%
                             | 
                            
                                17.41%
                             | 
                            
                                0.48
                             | 
                            
                                9.88%
                             | 
                            
                                19.18%
                             | 
                            
                                -7.89%
                             | 
                            
                                -17.02%
                             | 
                            
                                07/18/22
                             | 
                            
                                07/21/23
                             | 
                        
                    
                        
                            | 
                                DJUL
                                DJUL
                                FT Vest U.S. Equity Deep Buffer ETF - July
                             | 
                            
                                July
                             | 
                            
                                SPY
                             | 
                            
                                S&P 500® Index
                             | 
                            
                                13.94%
                             | 
                            
                                14.02%
                             | 
                            
                                21.41%
                             | 
                            
                                0.53
                             | 
                            
                                6.61%
                             | 
                            
                                11.36%
                             | 
                            
                                -5.96%
                             | 
                            
                                -10.29%
                             | 
                            
                                07/24/23
                             | 
                            
                                07/19/24
                             | 
                        
                    
                        
                            | 
                                DJUL
                                DJUL
                                FT Vest U.S. Equity Deep Buffer ETF - July
                             | 
                            
                                July
                             | 
                            
                                SPY
                             | 
                            
                                S&P 500® Index
                             | 
                            
                                13.18%
                             | 
                            
                                13.26%
                             | 
                            
                                14.32%
                             | 
                            
                                0.57
                             | 
                            
                                11.58%
                             | 
                            
                                20.50%
                             | 
                            
                                -11.30%
                             | 
                            
                                -19.00%
                             | 
                            
                                07/22/24
                             | 
                            
                                07/18/25
                             | 
                        
                    
                        
                            | 
                                DJUN
                                DJUN
                                FT Vest U.S. Equity Deep Buffer ETF - June
                             | 
                            
                                June
                             | 
                            
                                SPY
                             | 
                            
                                S&P 500® Index
                             | 
                            
                                9.43%
                             | 
                            
                                9.52%
                             | 
                            
                                34.43%
                             | 
                            
                                0.28
                             | 
                            
                                4.90%
                             | 
                            
                                15.64%
                             | 
                            
                                -2.68%
                             | 
                            
                                -9.80%
                             | 
                            
                                06/22/20
                             | 
                            
                                06/18/21
                             | 
                        
                    
                        
                            | 
                                DJUN
                                DJUN
                                FT Vest U.S. Equity Deep Buffer ETF - June
                             | 
                            
                                June
                             | 
                            
                                SPY
                             | 
                            
                                S&P 500® Index
                             | 
                            
                                6.21%
                             | 
                            
                                -5.82%
                             | 
                            
                                -11.82%
                             | 
                            
                                0.40
                             | 
                            
                                8.45%
                             | 
                            
                                19.41%
                             | 
                            
                                -9.95%
                             | 
                            
                                -23.41%
                             | 
                            
                                06/21/21
                             | 
                            
                                06/17/22
                             | 
                        
                    
                        
                            | 
                                DJUN
                                DJUN
                                FT Vest U.S. Equity Deep Buffer ETF - June
                             | 
                            
                                June
                             | 
                            
                                SPY
                             | 
                            
                                S&P 500® Index
                             | 
                            
                                14.74%
                             | 
                            
                                14.82%
                             | 
                            
                                20.12%
                             | 
                            
                                0.47
                             | 
                            
                                9.95%
                             | 
                            
                                19.99%
                             | 
                            
                                -7.29%
                             | 
                            
                                -17.02%
                             | 
                            
                                06/21/22
                             | 
                            
                                06/16/23
                             | 
                        
                    
                        
                            | 
                                DJUN
                                DJUN
                                FT Vest U.S. Equity Deep Buffer ETF - June
                             | 
                            
                                June
                             | 
                            
                                SPY
                             | 
                            
                                S&P 500® Index
                             | 
                            
                                13.84%
                             | 
                            
                                13.92%
                             | 
                            
                                23.90%
                             | 
                            
                                0.50
                             | 
                            
                                6.28%
                             | 
                            
                                11.29%
                             | 
                            
                                -6.21%
                             | 
                            
                                -10.29%
                             | 
                            
                                06/20/23
                             | 
                            
                                06/21/24
                             | 
                        
                    
                        
                            | 
                                DJUN
                                DJUN
                                FT Vest U.S. Equity Deep Buffer ETF - June
                             | 
                            
                                June
                             | 
                            
                                SPY
                             | 
                            
                                S&P 500® Index
                             | 
                            
                                13.78%
                             | 
                            
                                8.37%
                             | 
                            
                                9.14%
                             | 
                            
                                0.62
                             | 
                            
                                12.75%
                             | 
                            
                                20.54%
                             | 
                            
                                -11.93%
                             | 
                            
                                -19.00%
                             | 
                            
                                06/24/24
                             | 
                            
                                06/20/25
                             | 
                        
                    
                        
                            | 
                                DMAR
                                DMAR
                                FT Vest U.S. Equity Deep Buffer ETF - March
                             | 
                            
                                March
                             | 
                            
                                SPY
                             | 
                            
                                S&P 500® Index
                             | 
                            
                                8.45%
                             | 
                            
                                8.50%
                             | 
                            
                                14.13%
                             | 
                            
                                0.34
                             | 
                            
                                5.73%
                             | 
                            
                                14.84%
                             | 
                            
                                -2.89%
                             | 
                            
                                -12.87%
                             | 
                            
                                03/22/21
                             | 
                            
                                03/18/22
                             | 
                        
                    
                        
                            | 
                                DMAR
                                DMAR
                                FT Vest U.S. Equity Deep Buffer ETF - March
                             | 
                            
                                March
                             | 
                            
                                SPY
                             | 
                            
                                S&P 500® Index
                             | 
                            
                                9.17%
                             | 
                            
                                -5.72%
                             | 
                            
                                -12.27%
                             | 
                            
                                0.37
                             | 
                            
                                9.27%
                             | 
                            
                                23.46%
                             | 
                            
                                -9.73%
                             | 
                            
                                -22.75%
                             | 
                            
                                03/21/22
                             | 
                            
                                03/17/23
                             | 
                        
                    
                        
                            | 
                                DMAR
                                DMAR
                                FT Vest U.S. Equity Deep Buffer ETF - March
                             | 
                            
                                March
                             | 
                            
                                SPY
                             | 
                            
                                S&P 500® Index
                             | 
                            
                                13.51%
                             | 
                            
                                13.57%
                             | 
                            
                                30.73%
                             | 
                            
                                0.31
                             | 
                            
                                4.59%
                             | 
                            
                                11.86%
                             | 
                            
                                -3.72%
                             | 
                            
                                -10.29%
                             | 
                            
                                03/20/23
                             | 
                            
                                03/15/24
                             | 
                        
                    
                        
                            | 
                                DMAR
                                DMAR
                                FT Vest U.S. Equity Deep Buffer ETF - March
                             | 
                            
                                March
                             | 
                            
                                SPY
                             | 
                            
                                S&P 500® Index
                             | 
                            
                                14.55%
                             | 
                            
                                9.82%
                             | 
                            
                                10.62%
                             | 
                            
                                0.53
                             | 
                            
                                7.79%
                             | 
                            
                                13.56%
                             | 
                            
                                -5.88%
                             | 
                            
                                -10.04%
                             | 
                            
                                03/18/24
                             | 
                            
                                03/21/25
                             | 
                        
                    
                        
                            | 
                                DMAY
                                DMAY
                                FT Vest U.S. Equity Deep Buffer ETF - May
                             | 
                            
                                May
                             | 
                            
                                SPY
                             | 
                            
                                S&P 500® Index
                             | 
                            
                                9.08%
                             | 
                            
                                9.16%
                             | 
                            
                                44.94%
                             | 
                            
                                0.24
                             | 
                            
                                4.88%
                             | 
                            
                                17.35%
                             | 
                            
                                -2.80%
                             | 
                            
                                -9.80%
                             | 
                            
                                05/18/20
                             | 
                            
                                05/21/21
                             | 
                        
                    
                        
                            | 
                                DMAY
                                DMAY
                                FT Vest U.S. Equity Deep Buffer ETF - May
                             | 
                            
                                May
                             | 
                            
                                SPY
                             | 
                            
                                S&P 500® Index
                             | 
                            
                                6.75%
                             | 
                            
                                -5.80%
                             | 
                            
                                -6.10%
                             | 
                            
                                0.47
                             | 
                            
                                9.04%
                             | 
                            
                                17.79%
                             | 
                            
                                -10.74%
                             | 
                            
                                -18.47%
                             | 
                            
                                05/24/21
                             | 
                            
                                05/20/22
                             | 
                        
                    
                        
                            | 
                                DMAY
                                DMAY
                                FT Vest U.S. Equity Deep Buffer ETF - May
                             | 
                            
                                May
                             | 
                            
                                SPY
                             | 
                            
                                S&P 500® Index
                             | 
                            
                                13.08%
                             | 
                            
                                6.69%
                             | 
                            
                                7.44%
                             | 
                            
                                0.51
                             | 
                            
                                11.36%
                             | 
                            
                                21.36%
                             | 
                            
                                -7.99%
                             | 
                            
                                -17.02%
                             | 
                            
                                05/23/22
                             | 
                            
                                05/19/23
                             | 
                        
                    
                        
                            | 
                                DMAY
                                DMAY
                                FT Vest U.S. Equity Deep Buffer ETF - May
                             | 
                            
                                May
                             | 
                            
                                SPY
                             | 
                            
                                S&P 500® Index
                             | 
                            
                                12.82%
                             | 
                            
                                12.89%
                             | 
                            
                                26.48%
                             | 
                            
                                0.36
                             | 
                            
                                5.16%
                             | 
                            
                                11.60%
                             | 
                            
                                -4.90%
                             | 
                            
                                -10.29%
                             | 
                            
                                05/22/23
                             | 
                            
                                05/17/24
                             | 
                        
                    
                        
                            | 
                                DMAY
                                DMAY
                                FT Vest U.S. Equity Deep Buffer ETF - May
                             | 
                            
                                May
                             | 
                            
                                SPY
                             | 
                            
                                S&P 500® Index
                             | 
                            
                                14.57%
                             | 
                            
                                11.47%
                             | 
                            
                                12.23%
                             | 
                            
                                0.65
                             | 
                            
                                13.21%
                             | 
                            
                                20.34%
                             | 
                            
                                -12.52%
                             | 
                            
                                -19.00%
                             | 
                            
                                05/20/24
                             | 
                            
                                05/16/25
                             | 
                        
                    
                        
                            | 
                                DNOV
                                DNOV
                                FT Vest U.S. Equity Deep Buffer ETF - November
                             | 
                            
                                November
                             | 
                            
                                SPY
                             | 
                            
                                S&P 500® Index
                             | 
                            
                                7.26%
                             | 
                            
                                7.32%
                             | 
                            
                                13.96%
                             | 
                            
                                0.45
                             | 
                            
                                16.30%
                             | 
                            
                                33.25%
                             | 
                            
                                -15.91%
                             | 
                            
                                -34.10%
                             | 
                            
                                11/18/19
                             | 
                            
                                11/20/20
                             | 
                        
                    
                        
                            | 
                                DNOV
                                DNOV
                                FT Vest U.S. Equity Deep Buffer ETF - November
                             | 
                            
                                November
                             | 
                            
                                SPY
                             | 
                            
                                S&P 500® Index
                             | 
                            
                                6.90%
                             | 
                            
                                6.96%
                             | 
                            
                                31.96%
                             | 
                            
                                0.25
                             | 
                            
                                3.49%
                             | 
                            
                                12.08%
                             | 
                            
                                -1.61%
                             | 
                            
                                -5.42%
                             | 
                            
                                11/23/20
                             | 
                            
                                11/19/21
                             | 
                        
                    
                        
                            | 
                                DNOV
                                DNOV
                                FT Vest U.S. Equity Deep Buffer ETF - November
                             | 
                            
                                November
                             | 
                            
                                SPY
                             | 
                            
                                S&P 500® Index
                             | 
                            
                                6.75%
                             | 
                            
                                -5.74%
                             | 
                            
                                -15.54%
                             | 
                            
                                0.29
                             | 
                            
                                8.01%
                             | 
                            
                                24.13%
                             | 
                            
                                -9.47%
                             | 
                            
                                -25.36%
                             | 
                            
                                11/22/21
                             | 
                            
                                11/18/22
                             | 
                        
                    
                        
                            | 
                                DNOV
                                DNOV
                                FT Vest U.S. Equity Deep Buffer ETF - November
                             | 
                            
                                November
                             | 
                            
                                SPY
                             | 
                            
                                S&P 500® Index
                             | 
                            
                                16.34%
                             | 
                            
                                13.08%
                             | 
                            
                                13.83%
                             | 
                            
                                0.61
                             | 
                            
                                9.33%
                             | 
                            
                                14.49%
                             | 
                            
                                -7.92%
                             | 
                            
                                -10.29%
                             | 
                            
                                11/21/22
                             | 
                            
                                11/17/23
                             | 
                        
                    
                        
                            | 
                                DNOV
                                DNOV
                                FT Vest U.S. Equity Deep Buffer ETF - November
                             | 
                            
                                November
                             | 
                            
                                SPY
                             | 
                            
                                S&P 500® Index
                             | 
                            
                                14.21%
                             | 
                            
                                14.26%
                             | 
                            
                                29.94%
                             | 
                            
                                0.30
                             | 
                            
                                4.30%
                             | 
                            
                                12.26%
                             | 
                            
                                -2.67%
                             | 
                            
                                -8.41%
                             | 
                            
                                11/20/23
                             | 
                            
                                11/15/24
                             | 
                        
                    
                        
                            | 
                                DOCT
                                DOCT
                                FT Vest U.S. Equity Deep Buffer ETF - October
                             | 
                            
                                October
                             | 
                            
                                SPY
                             | 
                            
                                S&P 500® Index
                             | 
                            
                                8.49%
                             | 
                            
                                8.57%
                             | 
                            
                                28.39%
                             | 
                            
                                0.29
                             | 
                            
                                4.51%
                             | 
                            
                                13.57%
                             | 
                            
                                -2.47%
                             | 
                            
                                -5.97%
                             | 
                            
                                10/19/20
                             | 
                            
                                10/15/21
                             | 
                        
                    
                        
                            | 
                                DOCT
                                DOCT
                                FT Vest U.S. Equity Deep Buffer ETF - October
                             | 
                            
                                October
                             | 
                            
                                SPY
                             | 
                            
                                S&P 500® Index
                             | 
                            
                                6.36%
                             | 
                            
                                -5.78%
                             | 
                            
                                -16.05%
                             | 
                            
                                0.32
                             | 
                            
                                8.08%
                             | 
                            
                                22.73%
                             | 
                            
                                -9.30%
                             | 
                            
                                -25.36%
                             | 
                            
                                10/18/21
                             | 
                            
                                10/21/22
                             | 
                        
                    
                        
                            | 
                                DOCT
                                DOCT
                                FT Vest U.S. Equity Deep Buffer ETF - October
                             | 
                            
                                October
                             | 
                            
                                SPY
                             | 
                            
                                S&P 500® Index
                             | 
                            
                                18.35%
                             | 
                            
                                11.76%
                             | 
                            
                                12.53%
                             | 
                            
                                0.53
                             | 
                            
                                8.89%
                             | 
                            
                                15.86%
                             | 
                            
                                -4.26%
                             | 
                            
                                -7.99%
                             | 
                            
                                10/24/22
                             | 
                            
                                10/20/23
                             | 
                        
                    
                        
                            | 
                                DOCT
                                DOCT
                                FT Vest U.S. Equity Deep Buffer ETF - October
                             | 
                            
                                October
                             | 
                            
                                SPY
                             | 
                            
                                S&P 500® Index
                             | 
                            
                                14.53%
                             | 
                            
                                14.58%
                             | 
                            
                                38.79%
                             | 
                            
                                0.24
                             | 
                            
                                3.69%
                             | 
                            
                                12.32%
                             | 
                            
                                -1.72%
                             | 
                            
                                -8.41%
                             | 
                            
                                10/23/23
                             | 
                            
                                10/18/24
                             | 
                        
                    
                        
                            | 
                                DOCT
                                DOCT
                                FT Vest U.S. Equity Deep Buffer ETF - October
                             | 
                            
                                October
                             | 
                            
                                SPY
                             | 
                            
                                S&P 500® Index
                             | 
                            
                                11.10%
                             | 
                            
                                11.18%
                             | 
                            
                                13.65%
                             | 
                            
                                0.52
                             | 
                            
                                9.96%
                             | 
                            
                                19.67%
                             | 
                            
                                -9.99%
                             | 
                            
                                -19.00%
                             | 
                            
                                10/21/24
                             | 
                            
                                10/17/25
                             | 
                        
                    
                        
                            | 
                                DSEP
                                DSEP
                                FT Vest U.S. Equity Deep Buffer ETF - September
                             | 
                            
                                September
                             | 
                            
                                SPY
                             | 
                            
                                S&P 500® Index
                             | 
                            
                                8.40%
                             | 
                            
                                8.49%
                             | 
                            
                                33.49%
                             | 
                            
                                0.28
                             | 
                            
                                4.30%
                             | 
                            
                                13.84%
                             | 
                            
                                -2.76%
                             | 
                            
                                -7.35%
                             | 
                            
                                09/21/20
                             | 
                            
                                09/17/21
                             | 
                        
                    
                        
                            | 
                                DSEP
                                DSEP
                                FT Vest U.S. Equity Deep Buffer ETF - September
                             | 
                            
                                September
                             | 
                            
                                SPY
                             | 
                            
                                S&P 500® Index
                             | 
                            
                                6.58%
                             | 
                            
                                -5.78%
                             | 
                            
                                -12.65%
                             | 
                            
                                0.35
                             | 
                            
                                8.22%
                             | 
                            
                                21.75%
                             | 
                            
                                -9.35%
                             | 
                            
                                -23.41%
                             | 
                            
                                09/20/21
                             | 
                            
                                09/16/22
                             | 
                        
                    
                        
                            | 
                                DSEP
                                DSEP
                                FT Vest U.S. Equity Deep Buffer ETF - September
                             | 
                            
                                September
                             | 
                            
                                SPY
                             | 
                            
                                S&P 500® Index
                             | 
                            
                                16.13%
                             | 
                            
                                14.23%
                             | 
                            
                                14.99%
                             | 
                            
                                0.54
                             | 
                            
                                9.74%
                             | 
                            
                                17.58%
                             | 
                            
                                -4.35%
                             | 
                            
                                -8.23%
                             | 
                            
                                09/19/22
                             | 
                            
                                09/15/23
                             | 
                        
                    
                        
                            | 
                                DSEP
                                DSEP
                                FT Vest U.S. Equity Deep Buffer ETF - September
                             | 
                            
                                September
                             | 
                            
                                SPY
                             | 
                            
                                S&P 500® Index
                             | 
                            
                                14.44%
                             | 
                            
                                14.51%
                             | 
                            
                                28.17%
                             | 
                            
                                0.37
                             | 
                            
                                5.49%
                             | 
                            
                                12.68%
                             | 
                            
                                -4.49%
                             | 
                            
                                -8.41%
                             | 
                            
                                09/18/23
                             | 
                            
                                09/20/24
                             | 
                        
                    
                        
                            | 
                                DSEP
                                DSEP
                                FT Vest U.S. Equity Deep Buffer ETF - September
                             | 
                            
                                September
                             | 
                            
                                SPY
                             | 
                            
                                S&P 500® Index
                             | 
                            
                                10.63%
                             | 
                            
                                10.72%
                             | 
                            
                                16.80%
                             | 
                            
                                0.52
                             | 
                            
                                9.80%
                             | 
                            
                                19.49%
                             | 
                            
                                -9.90%
                             | 
                            
                                -19.00%
                             | 
                            
                                09/23/24
                             | 
                            
                                09/19/25
                             | 
                        
                    
                        
                            | 
                                FAPR
                                FAPR
                                FT Vest U.S. Equity Buffer ETF - April
                             | 
                            
                                April
                             | 
                            
                                SPY
                             | 
                            
                                S&P 500® Index
                             | 
                            
                                11.15%
                             | 
                            
                                4.15%
                             | 
                            
                                4.92%
                             | 
                            
                                0.59
                             | 
                            
                                9.96%
                             | 
                            
                                15.19%
                             | 
                            
                                -7.08%
                             | 
                            
                                -12.87%
                             | 
                            
                                04/19/21
                             | 
                            
                                04/14/22
                             | 
                        
                    
                        
                            | 
                                FAPR
                                FAPR
                                FT Vest U.S. Equity Buffer ETF - April
                             | 
                            
                                April
                             | 
                            
                                SPY
                             | 
                            
                                S&P 500® Index
                             | 
                            
                                15.48%
                             | 
                            
                                -0.70%
                             | 
                            
                                -5.85%
                             | 
                            
                                0.64
                             | 
                            
                                15.03%
                             | 
                            
                                23.10%
                             | 
                            
                                -12.77%
                             | 
                            
                                -19.88%
                             | 
                            
                                04/18/22
                             | 
                            
                                04/21/23
                             | 
                        
                    
                        
                            | 
                                FAPR
                                FAPR
                                FT Vest U.S. Equity Buffer ETF - April
                             | 
                            
                                April
                             | 
                            
                                SPY
                             | 
                            
                                S&P 500® Index
                             | 
                            
                                17.63%
                             | 
                            
                                17.69%
                             | 
                            
                                20.13%
                             | 
                            
                                0.54
                             | 
                            
                                7.36%
                             | 
                            
                                11.84%
                             | 
                            
                                -6.61%
                             | 
                            
                                -10.29%
                             | 
                            
                                04/24/23
                             | 
                            
                                04/19/24
                             | 
                        
                    
                        
                            | 
                                FAPR
                                FAPR
                                FT Vest U.S. Equity Buffer ETF - April
                             | 
                            
                                April
                             | 
                            
                                SPY
                             | 
                            
                                S&P 500® Index
                             | 
                            
                                16.88%
                             | 
                            
                                5.51%
                             | 
                            
                                6.31%
                             | 
                            
                                0.68
                             | 
                            
                                13.66%
                             | 
                            
                                19.72%
                             | 
                            
                                -11.76%
                             | 
                            
                                -19.00%
                             | 
                            
                                04/22/24
                             | 
                            
                                04/17/25
                             | 
                        
                    
                        
                            | 
                                FAUG
                                FAUG
                                FT Vest U.S. Equity Buffer ETF - August
                             | 
                            
                                August
                             | 
                            
                                SPY
                             | 
                            
                                S&P 500® Index
                             | 
                            
                                7.93%
                             | 
                            
                                8.06%
                             | 
                            
                                10.54%
                             | 
                            
                                0.66
                             | 
                            
                                24.77%
                             | 
                            
                                35.87%
                             | 
                            
                                -22.90%
                             | 
                            
                                -34.10%
                             | 
                            
                                11/07/19
                             | 
                            
                                08/21/20
                             | 
                        
                    
                        
                            | 
                                FAUG
                                FAUG
                                FT Vest U.S. Equity Buffer ETF - August
                             | 
                            
                                August
                             | 
                            
                                SPY
                             | 
                            
                                S&P 500® Index
                             | 
                            
                                13.86%
                             | 
                            
                                13.97%
                             | 
                            
                                30.60%
                             | 
                            
                                0.50
                             | 
                            
                                8.44%
                             | 
                            
                                14.98%
                             | 
                            
                                -5.21%
                             | 
                            
                                -9.80%
                             | 
                            
                                08/24/20
                             | 
                            
                                08/20/21
                             | 
                        
                    
                        
                            | 
                                FAUG
                                FAUG
                                FT Vest U.S. Equity Buffer ETF - August
                             | 
                            
                                August
                             | 
                            
                                SPY
                             | 
                            
                                S&P 500® Index
                             | 
                            
                                10.79%
                             | 
                            
                                -0.76%
                             | 
                            
                                -4.79%
                             | 
                            
                                0.58
                             | 
                            
                                12.63%
                             | 
                            
                                20.71%
                             | 
                            
                                -13.41%
                             | 
                            
                                -23.41%
                             | 
                            
                                08/23/21
                             | 
                            
                                08/19/22
                             | 
                        
                    
                        
                            | 
                                FAUG
                                FAUG
                                FT Vest U.S. Equity Buffer ETF - August
                             | 
                            
                                August
                             | 
                            
                                SPY
                             | 
                            
                                S&P 500® Index
                             | 
                            
                                19.61%
                             | 
                            
                                2.72%
                             | 
                            
                                3.40%
                             | 
                            
                                0.68
                             | 
                            
                                13.02%
                             | 
                            
                                18.69%
                             | 
                            
                                -10.75%
                             | 
                            
                                -15.54%
                             | 
                            
                                08/22/22
                             | 
                            
                                08/18/23
                             | 
                        
                    
                        
                            | 
                                FAUG
                                FAUG
                                FT Vest U.S. Equity Buffer ETF - August
                             | 
                            
                                August
                             | 
                            
                                SPY
                             | 
                            
                                S&P 500® Index
                             | 
                            
                                17.85%
                             | 
                            
                                17.92%
                             | 
                            
                                26.99%
                             | 
                            
                                0.49
                             | 
                            
                                7.00%
                             | 
                            
                                12.56%
                             | 
                            
                                -5.97%
                             | 
                            
                                -8.98%
                             | 
                            
                                08/21/23
                             | 
                            
                                08/16/24
                             | 
                        
                    
                        
                            | 
                                FAUG
                                FAUG
                                FT Vest U.S. Equity Buffer ETF - August
                             | 
                            
                                August
                             | 
                            
                                SPY
                             | 
                            
                                S&P 500® Index
                             | 
                            
                                13.70%
                             | 
                            
                                13.78%
                             | 
                            
                                16.08%
                             | 
                            
                                0.68
                             | 
                            
                                13.06%
                             | 
                            
                                19.78%
                             | 
                            
                                -12.55%
                             | 
                            
                                -19.00%
                             | 
                            
                                08/19/24
                             | 
                            
                                08/15/25
                             | 
                        
                    
                        
                            | 
                                FDEC
                                FDEC
                                FT Vest U.S. Equity Buffer ETF - December
                             | 
                            
                                December
                             | 
                            
                                SPY
                             | 
                            
                                S&P 500® Index
                             | 
                            
                                13.15%
                             | 
                            
                                13.21%
                             | 
                            
                                24.57%
                             | 
                            
                                0.44
                             | 
                            
                                6.51%
                             | 
                            
                                12.90%
                             | 
                            
                                -2.80%
                             | 
                            
                                -5.42%
                             | 
                            
                                12/21/20
                             | 
                            
                                12/17/21
                             | 
                        
                    
                        
                            | 
                                FDEC
                                FDEC
                                FT Vest U.S. Equity Buffer ETF - December
                             | 
                            
                                December
                             | 
                            
                                SPY
                             | 
                            
                                S&P 500® Index
                             | 
                            
                                12.25%
                             | 
                            
                                -7.37%
                             | 
                            
                                -16.66%
                             | 
                            
                                0.67
                             | 
                            
                                16.78%
                             | 
                            
                                24.23%
                             | 
                            
                                -15.89%
                             | 
                            
                                -25.36%
                             | 
                            
                                12/20/21
                             | 
                            
                                12/16/22
                             | 
                        
                    
                        
                            | 
                                FDEC
                                FDEC
                                FT Vest U.S. Equity Buffer ETF - December
                             | 
                            
                                December
                             | 
                            
                                SPY
                             | 
                            
                                S&P 500® Index
                             | 
                            
                                22.25%
                             | 
                            
                                21.69%
                             | 
                            
                                22.45%
                             | 
                            
                                0.76
                             | 
                            
                                10.49%
                             | 
                            
                                13.45%
                             | 
                            
                                -8.08%
                             | 
                            
                                -10.29%
                             | 
                            
                                12/19/22
                             | 
                            
                                12/15/23
                             | 
                        
                    
                        
                            | 
                                FDEC
                                FDEC
                                FT Vest U.S. Equity Buffer ETF - December
                             | 
                            
                                December
                             | 
                            
                                SPY
                             | 
                            
                                S&P 500® Index
                             | 
                            
                                15.79%
                             | 
                            
                                15.84%
                             | 
                            
                                25.96%
                             | 
                            
                                0.41
                             | 
                            
                                6.00%
                             | 
                            
                                12.49%
                             | 
                            
                                -4.04%
                             | 
                            
                                -8.41%
                             | 
                            
                                12/18/23
                             | 
                            
                                12/20/24
                             | 
                        
                    
                        
                            | 
                                FFEB
                                FFEB
                                FT Vest U.S. Equity Buffer ETF - February
                             | 
                            
                                February
                             | 
                            
                                SPY
                             | 
                            
                                S&P 500® Index
                             | 
                            
                                9.90%
                             | 
                            
                                10.04%
                             | 
                            
                                16.96%
                             | 
                            
                                0.71
                             | 
                            
                                25.12%
                             | 
                            
                                33.77%
                             | 
                            
                                -24.71%
                             | 
                            
                                -33.14%
                             | 
                            
                                02/24/20
                             | 
                            
                                02/19/21
                             | 
                        
                    
                        
                            | 
                                FFEB
                                FFEB
                                FT Vest U.S. Equity Buffer ETF - February
                             | 
                            
                                February
                             | 
                            
                                SPY
                             | 
                            
                                S&P 500® Index
                             | 
                            
                                15.00%
                             | 
                            
                                10.51%
                             | 
                            
                                11.33%
                             | 
                            
                                0.54
                             | 
                            
                                8.70%
                             | 
                            
                                14.08%
                             | 
                            
                                -4.00%
                             | 
                            
                                -9.73%
                             | 
                            
                                02/22/21
                             | 
                            
                                02/18/22
                             | 
                        
                    
                        
                            | 
                                FFEB
                                FFEB
                                FT Vest U.S. Equity Buffer ETF - February
                             | 
                            
                                February
                             | 
                            
                                SPY
                             | 
                            
                                S&P 500® Index
                             | 
                            
                                13.40%
                             | 
                            
                                -0.71%
                             | 
                            
                                -6.21%
                             | 
                            
                                0.61
                             | 
                            
                                15.10%
                             | 
                            
                                23.97%
                             | 
                            
                                -13.54%
                             | 
                            
                                -22.75%
                             | 
                            
                                02/22/22
                             | 
                            
                                02/17/23
                             | 
                        
                    
                        
                            | 
                                FFEB
                                FFEB
                                FT Vest U.S. Equity Buffer ETF - February
                             | 
                            
                                February
                             | 
                            
                                SPY
                             | 
                            
                                S&P 500® Index
                             | 
                            
                                18.40%
                             | 
                            
                                18.48%
                             | 
                            
                                22.65%
                             | 
                            
                                0.69
                             | 
                            
                                9.05%
                             | 
                            
                                12.53%
                             | 
                            
                                -7.14%
                             | 
                            
                                -10.29%
                             | 
                            
                                02/21/23
                             | 
                            
                                02/16/24
                             | 
                        
                    
                        
                            | 
                                FFEB
                                FFEB
                                FT Vest U.S. Equity Buffer ETF - February
                             | 
                            
                                February
                             | 
                            
                                SPY
                             | 
                            
                                S&P 500® Index
                             | 
                            
                                15.96%
                             | 
                            
                                16.02%
                             | 
                            
                                20.11%
                             | 
                            
                                0.50
                             | 
                            
                                6.98%
                             | 
                            
                                12.75%
                             | 
                            
                                -5.04%
                             | 
                            
                                -8.41%
                             | 
                            
                                02/20/24
                             | 
                            
                                02/21/25
                             | 
                        
                    
                        
                            | 
                                FJAN
                                FJAN
                                FT Vest U.S. Equity Buffer ETF - January
                             | 
                            
                                January
                             | 
                            
                                SPY
                             | 
                            
                                S&P 500® Index
                             | 
                            
                                13.64%
                             | 
                            
                                13.67%
                             | 
                            
                                16.58%
                             | 
                            
                                0.42
                             | 
                            
                                6.49%
                             | 
                            
                                13.43%
                             | 
                            
                                -2.72%
                             | 
                            
                                -8.32%
                             | 
                            
                                01/19/21
                             | 
                            
                                01/21/22
                             | 
                        
                    
                        
                            | 
                                FJAN
                                FJAN
                                FT Vest U.S. Equity Buffer ETF - January
                             | 
                            
                                January
                             | 
                            
                                SPY
                             | 
                            
                                S&P 500® Index
                             | 
                            
                                13.35%
                             | 
                            
                                -0.73%
                             | 
                            
                                -9.61%
                             | 
                            
                                0.64
                             | 
                            
                                15.81%
                             | 
                            
                                24.34%
                             | 
                            
                                -13.77%
                             | 
                            
                                -22.75%
                             | 
                            
                                01/24/22
                             | 
                            
                                01/20/23
                             | 
                        
                    
                        
                            | 
                                FJAN
                                FJAN
                                FT Vest U.S. Equity Buffer ETF - January
                             | 
                            
                                January
                             | 
                            
                                SPY
                             | 
                            
                                S&P 500® Index
                             | 
                            
                                18.19%
                             | 
                            
                                18.27%
                             | 
                            
                                21.86%
                             | 
                            
                                0.66
                             | 
                            
                                8.84%
                             | 
                            
                                12.81%
                             | 
                            
                                -6.68%
                             | 
                            
                                -10.29%
                             | 
                            
                                01/23/23
                             | 
                            
                                01/19/24
                             | 
                        
                    
                        
                            | 
                                FJAN
                                FJAN
                                FT Vest U.S. Equity Buffer ETF - January
                             | 
                            
                                January
                             | 
                            
                                SPY
                             | 
                            
                                S&P 500® Index
                             | 
                            
                                14.85%
                             | 
                            
                                14.91%
                             | 
                            
                                23.87%
                             | 
                            
                                0.41
                             | 
                            
                                5.99%
                             | 
                            
                                12.78%
                             | 
                            
                                -4.35%
                             | 
                            
                                -8.41%
                             | 
                            
                                01/22/24
                             | 
                            
                                01/17/25
                             | 
                        
                    
                        
                            | 
                                FJUL
                                FJUL
                                FT Vest U.S. Equity Buffer ETF - July
                             | 
                            
                                July
                             | 
                            
                                SPY
                             | 
                            
                                S&P 500® Index
                             | 
                            
                                14.10%
                             | 
                            
                                14.24%
                             | 
                            
                                34.07%
                             | 
                            
                                0.44
                             | 
                            
                                7.14%
                             | 
                            
                                14.96%
                             | 
                            
                                -4.54%
                             | 
                            
                                -9.80%
                             | 
                            
                                07/20/20
                             | 
                            
                                07/16/21
                             | 
                        
                    
                        
                            | 
                                FJUL
                                FJUL
                                FT Vest U.S. Equity Buffer ETF - July
                             | 
                            
                                July
                             | 
                            
                                SPY
                             | 
                            
                                S&P 500® Index
                             | 
                            
                                10.85%
                             | 
                            
                                -1.50%
                             | 
                            
                                -10.71%
                             | 
                            
                                0.58
                             | 
                            
                                11.95%
                             | 
                            
                                20.09%
                             | 
                            
                                -12.30%
                             | 
                            
                                -23.41%
                             | 
                            
                                07/19/21
                             | 
                            
                                07/15/22
                             | 
                        
                    
                        
                            | 
                                FJUL
                                FJUL
                                FT Vest U.S. Equity Buffer ETF - July
                             | 
                            
                                July
                             | 
                            
                                SPY
                             | 
                            
                                S&P 500® Index
                             | 
                            
                                20.44%
                             | 
                            
                                16.66%
                             | 
                            
                                17.41%
                             | 
                            
                                0.67
                             | 
                            
                                13.17%
                             | 
                            
                                19.18%
                             | 
                            
                                -10.76%
                             | 
                            
                                -17.02%
                             | 
                            
                                07/18/22
                             | 
                            
                                07/21/23
                             | 
                        
                    
                        
                            | 
                                FJUL
                                FJUL
                                FT Vest U.S. Equity Buffer ETF - July
                             | 
                            
                                July
                             | 
                            
                                SPY
                             | 
                            
                                S&P 500® Index
                             | 
                            
                                16.61%
                             | 
                            
                                16.69%
                             | 
                            
                                21.41%
                             | 
                            
                                0.64
                             | 
                            
                                7.97%
                             | 
                            
                                11.36%
                             | 
                            
                                -6.78%
                             | 
                            
                                -10.29%
                             | 
                            
                                07/24/23
                             | 
                            
                                07/19/24
                             | 
                        
                    
                        
                            | 
                                FJUL
                                FJUL
                                FT Vest U.S. Equity Buffer ETF - July
                             | 
                            
                                July
                             | 
                            
                                SPY
                             | 
                            
                                S&P 500® Index
                             | 
                            
                                14.84%
                             | 
                            
                                13.55%
                             | 
                            
                                14.32%
                             | 
                            
                                0.69
                             | 
                            
                                13.88%
                             | 
                            
                                20.50%
                             | 
                            
                                -13.03%
                             | 
                            
                                -19.00%
                             | 
                            
                                07/22/24
                             | 
                            
                                07/18/25
                             | 
                        
                    
                        
                            | 
                                FJUN
                                FJUN
                                FT Vest U.S. Equity Buffer ETF - June
                             | 
                            
                                June
                             | 
                            
                                SPY
                             | 
                            
                                S&P 500® Index
                             | 
                            
                                16.87%
                             | 
                            
                                16.99%
                             | 
                            
                                34.43%
                             | 
                            
                                0.48
                             | 
                            
                                8.34%
                             | 
                            
                                15.64%
                             | 
                            
                                -4.54%
                             | 
                            
                                -9.80%
                             | 
                            
                                06/22/20
                             | 
                            
                                06/18/21
                             | 
                        
                    
                        
                            | 
                                FJUN
                                FJUN
                                FT Vest U.S. Equity Buffer ETF - June
                             | 
                            
                                June
                             | 
                            
                                SPY
                             | 
                            
                                S&P 500® Index
                             | 
                            
                                10.85%
                             | 
                            
                                -2.65%
                             | 
                            
                                -11.82%
                             | 
                            
                                0.51
                             | 
                            
                                10.58%
                             | 
                            
                                19.41%
                             | 
                            
                                -9.95%
                             | 
                            
                                -23.41%
                             | 
                            
                                06/21/21
                             | 
                            
                                06/17/22
                             | 
                        
                    
                        
                            | 
                                FJUN
                                FJUN
                                FT Vest U.S. Equity Buffer ETF - June
                             | 
                            
                                June
                             | 
                            
                                SPY
                             | 
                            
                                S&P 500® Index
                             | 
                            
                                21.35%
                             | 
                            
                                19.37%
                             | 
                            
                                20.12%
                             | 
                            
                                0.66
                             | 
                            
                                13.63%
                             | 
                            
                                19.99%
                             | 
                            
                                -10.22%
                             | 
                            
                                -17.02%
                             | 
                            
                                06/21/22
                             | 
                            
                                06/16/23
                             | 
                        
                    
                        
                            | 
                                FJUN
                                FJUN
                                FT Vest U.S. Equity Buffer ETF - June
                             | 
                            
                                June
                             | 
                            
                                SPY
                             | 
                            
                                S&P 500® Index
                             | 
                            
                                17.39%
                             | 
                            
                                17.48%
                             | 
                            
                                23.90%
                             | 
                            
                                0.65
                             | 
                            
                                7.86%
                             | 
                            
                                11.29%
                             | 
                            
                                -6.99%
                             | 
                            
                                -10.29%
                             | 
                            
                                06/20/23
                             | 
                            
                                06/21/24
                             | 
                        
                    
                        
                            | 
                                FJUN
                                FJUN
                                FT Vest U.S. Equity Buffer ETF - June
                             | 
                            
                                June
                             | 
                            
                                SPY
                             | 
                            
                                S&P 500® Index
                             | 
                            
                                15.08%
                             | 
                            
                                8.38%
                             | 
                            
                                9.14%
                             | 
                            
                                0.69
                             | 
                            
                                13.96%
                             | 
                            
                                20.54%
                             | 
                            
                                -13.23%
                             | 
                            
                                -19.00%
                             | 
                            
                                06/24/24
                             | 
                            
                                06/20/25
                             | 
                        
                    
                        
                            | 
                                FMAR
                                FMAR
                                FT Vest U.S. Equity Buffer ETF - March
                             | 
                            
                                March
                             | 
                            
                                SPY
                             | 
                            
                                S&P 500® Index
                             | 
                            
                                13.35%
                             | 
                            
                                13.34%
                             | 
                            
                                14.13%
                             | 
                            
                                0.55
                             | 
                            
                                8.91%
                             | 
                            
                                14.84%
                             | 
                            
                                -5.66%
                             | 
                            
                                -12.87%
                             | 
                            
                                03/22/21
                             | 
                            
                                03/18/22
                             | 
                        
                    
                        
                            | 
                                FMAR
                                FMAR
                                FT Vest U.S. Equity Buffer ETF - March
                             | 
                            
                                March
                             | 
                            
                                SPY
                             | 
                            
                                S&P 500® Index
                             | 
                            
                                13.93%
                             | 
                            
                                -2.96%
                             | 
                            
                                -12.27%
                             | 
                            
                                0.64
                             | 
                            
                                15.34%
                             | 
                            
                                23.46%
                             | 
                            
                                -14.34%
                             | 
                            
                                -22.75%
                             | 
                            
                                03/21/22
                             | 
                            
                                03/17/23
                             | 
                        
                    
                        
                            | 
                                FMAR
                                FMAR
                                FT Vest U.S. Equity Buffer ETF - March
                             | 
                            
                                March
                             | 
                            
                                SPY
                             | 
                            
                                S&P 500® Index
                             | 
                            
                                18.50%
                             | 
                            
                                18.55%
                             | 
                            
                                30.73%
                             | 
                            
                                0.48
                             | 
                            
                                6.61%
                             | 
                            
                                11.86%
                             | 
                            
                                -5.45%
                             | 
                            
                                -10.29%
                             | 
                            
                                03/20/23
                             | 
                            
                                03/15/24
                             | 
                        
                    
                        
                            | 
                                FMAR
                                FMAR
                                FT Vest U.S. Equity Buffer ETF - March
                             | 
                            
                                March
                             | 
                            
                                SPY
                             | 
                            
                                S&P 500® Index
                             | 
                            
                                16.27%
                             | 
                            
                                9.82%
                             | 
                            
                                10.62%
                             | 
                            
                                0.60
                             | 
                            
                                8.68%
                             | 
                            
                                13.56%
                             | 
                            
                                -7.04%
                             | 
                            
                                -10.04%
                             | 
                            
                                03/18/24
                             | 
                            
                                03/21/25
                             | 
                        
                    
                        
                            | 
                                FMAY
                                FMAY
                                FT Vest U.S. Equity Buffer ETF - May
                             | 
                            
                                May
                             | 
                            
                                SPY
                             | 
                            
                                S&P 500® Index
                             | 
                            
                                16.21%
                             | 
                            
                                16.33%
                             | 
                            
                                44.94%
                             | 
                            
                                0.39
                             | 
                            
                                8.04%
                             | 
                            
                                17.35%
                             | 
                            
                                -4.25%
                             | 
                            
                                -9.80%
                             | 
                            
                                05/18/20
                             | 
                            
                                05/21/21
                             | 
                        
                    
                        
                            | 
                                FMAY
                                FMAY
                                FT Vest U.S. Equity Buffer ETF - May
                             | 
                            
                                May
                             | 
                            
                                SPY
                             | 
                            
                                S&P 500® Index
                             | 
                            
                                11.65%
                             | 
                            
                                -0.80%
                             | 
                            
                                -6.10%
                             | 
                            
                                0.54
                             | 
                            
                                10.33%
                             | 
                            
                                17.79%
                             | 
                            
                                -9.18%
                             | 
                            
                                -18.47%
                             | 
                            
                                05/24/21
                             | 
                            
                                05/20/22
                             | 
                        
                    
                        
                            | 
                                FMAY
                                FMAY
                                FT Vest U.S. Equity Buffer ETF - May
                             | 
                            
                                May
                             | 
                            
                                SPY
                             | 
                            
                                S&P 500® Index
                             | 
                            
                                19.60%
                             | 
                            
                                6.71%
                             | 
                            
                                7.44%
                             | 
                            
                                0.68
                             | 
                            
                                14.72%
                             | 
                            
                                21.36%
                             | 
                            
                                -11.18%
                             | 
                            
                                -17.02%
                             | 
                            
                                05/23/22
                             | 
                            
                                05/19/23
                             | 
                        
                    
                        
                            | 
                                FMAY
                                FMAY
                                FT Vest U.S. Equity Buffer ETF - May
                             | 
                            
                                May
                             | 
                            
                                SPY
                             | 
                            
                                S&P 500® Index
                             | 
                            
                                16.80%
                             | 
                            
                                16.87%
                             | 
                            
                                26.48%
                             | 
                            
                                0.50
                             | 
                            
                                6.63%
                             | 
                            
                                11.60%
                             | 
                            
                                -6.41%
                             | 
                            
                                -10.29%
                             | 
                            
                                05/22/23
                             | 
                            
                                05/17/24
                             | 
                        
                    
                        
                            | 
                                FMAY
                                FMAY
                                FT Vest U.S. Equity Buffer ETF - May
                             | 
                            
                                May
                             | 
                            
                                SPY
                             | 
                            
                                S&P 500® Index
                             | 
                            
                                15.07%
                             | 
                            
                                11.47%
                             | 
                            
                                12.23%
                             | 
                            
                                0.67
                             | 
                            
                                13.61%
                             | 
                            
                                20.34%
                             | 
                            
                                -12.87%
                             | 
                            
                                -19.00%
                             | 
                            
                                05/20/24
                             | 
                            
                                05/16/25
                             | 
                        
                    
                        
                            | 
                                FNOV
                                FNOV
                                FT Vest U.S. Equity Buffer ETF - November
                             | 
                            
                                November
                             | 
                            
                                SPY
                             | 
                            
                                S&P 500® Index
                             | 
                            
                                11.50%
                             | 
                            
                                11.64%
                             | 
                            
                                13.96%
                             | 
                            
                                0.72
                             | 
                            
                                25.00%
                             | 
                            
                                33.25%
                             | 
                            
                                -24.77%
                             | 
                            
                                -34.10%
                             | 
                            
                                11/18/19
                             | 
                            
                                11/20/20
                             | 
                        
                    
                        
                            | 
                                FNOV
                                FNOV
                                FT Vest U.S. Equity Buffer ETF - November
                             | 
                            
                                November
                             | 
                            
                                SPY
                             | 
                            
                                S&P 500® Index
                             | 
                            
                                12.87%
                             | 
                            
                                12.94%
                             | 
                            
                                31.96%
                             | 
                            
                                0.41
                             | 
                            
                                5.75%
                             | 
                            
                                12.08%
                             | 
                            
                                -2.50%
                             | 
                            
                                -5.42%
                             | 
                            
                                11/23/20
                             | 
                            
                                11/19/21
                             | 
                        
                    
                        
                            | 
                                FNOV
                                FNOV
                                FT Vest U.S. Equity Buffer ETF - November
                             | 
                            
                                November
                             | 
                            
                                SPY
                             | 
                            
                                S&P 500® Index
                             | 
                            
                                11.25%
                             | 
                            
                                -6.25%
                             | 
                            
                                -15.54%
                             | 
                            
                                0.69
                             | 
                            
                                17.07%
                             | 
                            
                                24.13%
                             | 
                            
                                -16.10%
                             | 
                            
                                -25.36%
                             | 
                            
                                11/22/21
                             | 
                            
                                11/18/22
                             | 
                        
                    
                        
                            | 
                                FNOV
                                FNOV
                                FT Vest U.S. Equity Buffer ETF - November
                             | 
                            
                                November
                             | 
                            
                                SPY
                             | 
                            
                                S&P 500® Index
                             | 
                            
                                22.92%
                             | 
                            
                                13.11%
                             | 
                            
                                13.83%
                             | 
                            
                                0.79
                             | 
                            
                                11.53%
                             | 
                            
                                14.49%
                             | 
                            
                                -9.51%
                             | 
                            
                                -10.29%
                             | 
                            
                                11/21/22
                             | 
                            
                                11/17/23
                             | 
                        
                    
                        
                            | 
                                FNOV
                                FNOV
                                FT Vest U.S. Equity Buffer ETF - November
                             | 
                            
                                November
                             | 
                            
                                SPY
                             | 
                            
                                S&P 500® Index
                             | 
                            
                                16.60%
                             | 
                            
                                16.64%
                             | 
                            
                                29.94%
                             | 
                            
                                0.38
                             | 
                            
                                5.31%
                             | 
                            
                                12.26%
                             | 
                            
                                -3.29%
                             | 
                            
                                -8.41%
                             | 
                            
                                11/20/23
                             | 
                            
                                11/15/24
                             | 
                        
                    
                        
                            | 
                                FOCT
                                FOCT
                                FT Vest U.S. Equity Buffer ETF - October
                             | 
                            
                                October
                             | 
                            
                                SPY
                             | 
                            
                                S&P 500® Index
                             | 
                            
                                15.37%
                             | 
                            
                                15.47%
                             | 
                            
                                28.39%
                             | 
                            
                                0.47
                             | 
                            
                                7.20%
                             | 
                            
                                13.57%
                             | 
                            
                                -3.98%
                             | 
                            
                                -5.97%
                             | 
                            
                                10/19/20
                             | 
                            
                                10/15/21
                             | 
                        
                    
                        
                            | 
                                FOCT
                                FOCT
                                FT Vest U.S. Equity Buffer ETF - October
                             | 
                            
                                October
                             | 
                            
                                SPY
                             | 
                            
                                S&P 500® Index
                             | 
                            
                                10.84%
                             | 
                            
                                -6.81%
                             | 
                            
                                -16.05%
                             | 
                            
                                0.63
                             | 
                            
                                14.92%
                             | 
                            
                                22.73%
                             | 
                            
                                -14.15%
                             | 
                            
                                -25.36%
                             | 
                            
                                10/18/21
                             | 
                            
                                10/21/22
                             | 
                        
                    
                        
                            | 
                                FOCT
                                FOCT
                                FT Vest U.S. Equity Buffer ETF - October
                             | 
                            
                                October
                             | 
                            
                                SPY
                             | 
                            
                                S&P 500® Index
                             | 
                            
                                26.27%
                             | 
                            
                                11.77%
                             | 
                            
                                12.53%
                             | 
                            
                                0.77
                             | 
                            
                                12.35%
                             | 
                            
                                15.86%
                             | 
                            
                                -7.30%
                             | 
                            
                                -7.99%
                             | 
                            
                                10/24/22
                             | 
                            
                                10/20/23
                             | 
                        
                    
                        
                            | 
                                FOCT
                                FOCT
                                FT Vest U.S. Equity Buffer ETF - October
                             | 
                            
                                October
                             | 
                            
                                SPY
                             | 
                            
                                S&P 500® Index
                             | 
                            
                                18.00%
                             | 
                            
                                18.04%
                             | 
                            
                                38.79%
                             | 
                            
                                0.32
                             | 
                            
                                4.71%
                             | 
                            
                                12.32%
                             | 
                            
                                -2.17%
                             | 
                            
                                -8.41%
                             | 
                            
                                10/23/23
                             | 
                            
                                10/18/24
                             | 
                        
                    
                        
                            | 
                                FOCT
                                FOCT
                                FT Vest U.S. Equity Buffer ETF - October
                             | 
                            
                                October
                             | 
                            
                                SPY
                             | 
                            
                                S&P 500® Index
                             | 
                            
                                13.24%
                             | 
                            
                                12.89%
                             | 
                            
                                13.65%
                             | 
                            
                                0.70
                             | 
                            
                                13.35%
                             | 
                            
                                19.67%
                             | 
                            
                                -13.01%
                             | 
                            
                                -19.00%
                             | 
                            
                                10/21/24
                             | 
                            
                                10/17/25
                             | 
                        
                    
                        
                            | 
                                FSEP
                                FSEP
                                FT Vest U.S. Equity Buffer ETF - September
                             | 
                            
                                September
                             | 
                            
                                SPY
                             | 
                            
                                S&P 500® Index
                             | 
                            
                                15.65%
                             | 
                            
                                15.76%
                             | 
                            
                                33.49%
                             | 
                            
                                0.48
                             | 
                            
                                7.20%
                             | 
                            
                                13.84%
                             | 
                            
                                -4.49%
                             | 
                            
                                -7.35%
                             | 
                            
                                09/21/20
                             | 
                            
                                09/17/21
                             | 
                        
                    
                        
                            | 
                                FSEP
                                FSEP
                                FT Vest U.S. Equity Buffer ETF - September
                             | 
                            
                                September
                             | 
                            
                                SPY
                             | 
                            
                                S&P 500® Index
                             | 
                            
                                11.35%
                             | 
                            
                                -3.42%
                             | 
                            
                                -12.65%
                             | 
                            
                                0.58
                             | 
                            
                                13.10%
                             | 
                            
                                21.75%
                             | 
                            
                                -13.65%
                             | 
                            
                                -23.41%
                             | 
                            
                                09/20/21
                             | 
                            
                                09/16/22
                             | 
                        
                    
                        
                            | 
                                FSEP
                                FSEP
                                FT Vest U.S. Equity Buffer ETF - September
                             | 
                            
                                September
                             | 
                            
                                SPY
                             | 
                            
                                S&P 500® Index
                             | 
                            
                                22.56%
                             | 
                            
                                14.26%
                             | 
                            
                                14.99%
                             | 
                            
                                0.75
                             | 
                            
                                13.35%
                             | 
                            
                                17.58%
                             | 
                            
                                -6.03%
                             | 
                            
                                -8.23%
                             | 
                            
                                09/19/22
                             | 
                            
                                09/15/23
                             | 
                        
                    
                        
                            | 
                                FSEP
                                FSEP
                                FT Vest U.S. Equity Buffer ETF - September
                             | 
                            
                                September
                             | 
                            
                                SPY
                             | 
                            
                                S&P 500® Index
                             | 
                            
                                17.34%
                             | 
                            
                                17.41%
                             | 
                            
                                28.17%
                             | 
                            
                                0.47
                             | 
                            
                                6.76%
                             | 
                            
                                12.68%
                             | 
                            
                                -5.17%
                             | 
                            
                                -8.41%
                             | 
                            
                                09/18/23
                             | 
                            
                                09/20/24
                             | 
                        
                    
                        
                            | 
                                FSEP
                                FSEP
                                FT Vest U.S. Equity Buffer ETF - September
                             | 
                            
                                September
                             | 
                            
                                SPY
                             | 
                            
                                S&P 500® Index
                             | 
                            
                                12.85%
                             | 
                            
                                12.94%
                             | 
                            
                                16.80%
                             | 
                            
                                0.68
                             | 
                            
                                12.78%
                             | 
                            
                                19.49%
                             | 
                            
                                -12.62%
                             | 
                            
                                -19.00%
                             | 
                            
                                09/23/24
                             | 
                            
                                09/19/25
                             | 
                        
                    
                        
                            | 
                                GAPR
                                GAPR
                                FT Vest U.S. Equity Moderate Buffer ETF - April
                             | 
                            
                                April
                             | 
                            
                                SPY
                             | 
                            
                                S&P 500® Index
                             | 
                            
                                13.83%
                             | 
                            
                                13.88%
                             | 
                            
                                20.13%
                             | 
                            
                                0.39
                             | 
                            
                                5.43%
                             | 
                            
                                11.84%
                             | 
                            
                                -4.78%
                             | 
                            
                                -10.29%
                             | 
                            
                                04/24/23
                             | 
                            
                                04/19/24
                             | 
                        
                    
                        
                            | 
                                GAPR
                                GAPR
                                FT Vest U.S. Equity Moderate Buffer ETF - April
                             | 
                            
                                April
                             | 
                            
                                SPY
                             | 
                            
                                S&P 500® Index
                             | 
                            
                                13.99%
                             | 
                            
                                5.50%
                             | 
                            
                                6.31%
                             | 
                            
                                0.55
                             | 
                            
                                11.19%
                             | 
                            
                                19.72%
                             | 
                            
                                -9.31%
                             | 
                            
                                -19.00%
                             | 
                            
                                04/22/24
                             | 
                            
                                04/17/25
                             | 
                        
                    
                        
                            | 
                                GAUG
                                GAUG
                                FT Vest U.S. Equity Moderate Buffer ETF - August
                             | 
                            
                                August
                             | 
                            
                                SPY
                             | 
                            
                                S&P 500® Index
                             | 
                            
                                14.42%
                             | 
                            
                                14.45%
                             | 
                            
                                26.99%
                             | 
                            
                                0.36
                             | 
                            
                                5.39%
                             | 
                            
                                12.56%
                             | 
                            
                                -4.73%
                             | 
                            
                                -8.98%
                             | 
                            
                                08/21/23
                             | 
                            
                                08/16/24
                             | 
                        
                    
                        
                            | 
                                GAUG
                                GAUG
                                FT Vest U.S. Equity Moderate Buffer ETF - August
                             | 
                            
                                August
                             | 
                            
                                SPY
                             | 
                            
                                S&P 500® Index
                             | 
                            
                                11.23%
                             | 
                            
                                11.30%
                             | 
                            
                                16.08%
                             | 
                            
                                0.52
                             | 
                            
                                10.12%
                             | 
                            
                                19.78%
                             | 
                            
                                -10.04%
                             | 
                            
                                -19.00%
                             | 
                            
                                08/19/24
                             | 
                            
                                08/15/25
                             | 
                        
                    
                        
                            | 
                                GDEC
                                GDEC
                                FT Vest U.S. Equity Moderate Buffer ETF - December
                             | 
                            
                                December
                             | 
                            
                                SPY
                             | 
                            
                                S&P 500® Index
                             | 
                            
                                12.45%
                             | 
                            
                                12.49%
                             | 
                            
                                25.96%
                             | 
                            
                                0.30
                             | 
                            
                                4.42%
                             | 
                            
                                12.49%
                             | 
                            
                                -2.99%
                             | 
                            
                                -8.41%
                             | 
                            
                                12/18/23
                             | 
                            
                                12/20/24
                             | 
                        
                    
                        
                            | 
                                GFEB
                                GFEB
                                FT Vest U.S. Equity Moderate Buffer ETF - February
                             | 
                            
                                February
                             | 
                            
                                SPY
                             | 
                            
                                S&P 500® Index
                             | 
                            
                                14.35%
                             | 
                            
                                14.43%
                             | 
                            
                                22.65%
                             | 
                            
                                0.51
                             | 
                            
                                6.88%
                             | 
                            
                                12.53%
                             | 
                            
                                -5.30%
                             | 
                            
                                -10.29%
                             | 
                            
                                02/21/23
                             | 
                            
                                02/16/24
                             | 
                        
                    
                        
                            | 
                                GFEB
                                GFEB
                                FT Vest U.S. Equity Moderate Buffer ETF - February
                             | 
                            
                                February
                             | 
                            
                                SPY
                             | 
                            
                                S&P 500® Index
                             | 
                            
                                13.10%
                             | 
                            
                                13.14%
                             | 
                            
                                20.11%
                             | 
                            
                                0.37
                             | 
                            
                                5.38%
                             | 
                            
                                12.75%
                             | 
                            
                                -3.93%
                             | 
                            
                                -8.41%
                             | 
                            
                                02/20/24
                             | 
                            
                                02/21/25
                             | 
                        
                    
                        
                            | 
                                GJAN
                                GJAN
                                FT Vest U.S. Equity Moderate Buffer ETF - January
                             | 
                            
                                January
                             | 
                            
                                SPY
                             | 
                            
                                S&P 500® Index
                             | 
                            
                                14.90%
                             | 
                            
                                14.99%
                             | 
                            
                                21.86%
                             | 
                            
                                0.51
                             | 
                            
                                6.93%
                             | 
                            
                                12.81%
                             | 
                            
                                -5.27%
                             | 
                            
                                -10.29%
                             | 
                            
                                01/23/23
                             | 
                            
                                01/19/24
                             | 
                        
                    
                        
                            | 
                                GJAN
                                GJAN
                                FT Vest U.S. Equity Moderate Buffer ETF - January
                             | 
                            
                                January
                             | 
                            
                                SPY
                             | 
                            
                                S&P 500® Index
                             | 
                            
                                12.11%
                             | 
                            
                                12.16%
                             | 
                            
                                23.87%
                             | 
                            
                                0.31
                             | 
                            
                                4.62%
                             | 
                            
                                12.78%
                             | 
                            
                                -3.09%
                             | 
                            
                                -8.41%
                             | 
                            
                                01/22/24
                             | 
                            
                                01/17/25
                             | 
                        
                    
                        
                            | 
                                GJUL
                                GJUL
                                FT Vest U.S. Equity Moderate Buffer ETF - July
                             | 
                            
                                July
                             | 
                            
                                SPY
                             | 
                            
                                S&P 500® Index
                             | 
                            
                                13.45%
                             | 
                            
                                13.49%
                             | 
                            
                                21.41%
                             | 
                            
                                0.51
                             | 
                            
                                6.38%
                             | 
                            
                                11.36%
                             | 
                            
                                -5.65%
                             | 
                            
                                -10.29%
                             | 
                            
                                07/24/23
                             | 
                            
                                07/19/24
                             | 
                        
                    
                        
                            | 
                                GJUL
                                GJUL
                                FT Vest U.S. Equity Moderate Buffer ETF - July
                             | 
                            
                                July
                             | 
                            
                                SPY
                             | 
                            
                                S&P 500® Index
                             | 
                            
                                12.33%
                             | 
                            
                                12.41%
                             | 
                            
                                14.32%
                             | 
                            
                                0.55
                             | 
                            
                                11.10%
                             | 
                            
                                20.50%
                             | 
                            
                                -10.65%
                             | 
                            
                                -19.00%
                             | 
                            
                                07/22/24
                             | 
                            
                                07/18/25
                             | 
                        
                    
                        
                            | 
                                GJUN
                                GJUN
                                FT Vest U.S. Equity Moderate Buffer ETF - June
                             | 
                            
                                June
                             | 
                            
                                SPY
                             | 
                            
                                S&P 500® Index
                             | 
                            
                                13.79%
                             | 
                            
                                13.86%
                             | 
                            
                                23.90%
                             | 
                            
                                0.50
                             | 
                            
                                6.17%
                             | 
                            
                                11.29%
                             | 
                            
                                -5.50%
                             | 
                            
                                -10.29%
                             | 
                            
                                06/20/23
                             | 
                            
                                06/21/24
                             | 
                        
                    
                        
                            | 
                                GJUN
                                GJUN
                                FT Vest U.S. Equity Moderate Buffer ETF - June
                             | 
                            
                                June
                             | 
                            
                                SPY
                             | 
                            
                                S&P 500® Index
                             | 
                            
                                12.66%
                             | 
                            
                                8.38%
                             | 
                            
                                9.14%
                             | 
                            
                                0.55
                             | 
                            
                                11.36%
                             | 
                            
                                20.54%
                             | 
                            
                                -10.87%
                             | 
                            
                                -19.00%
                             | 
                            
                                06/24/24
                             | 
                            
                                06/20/25
                             | 
                        
                    
                        
                            | 
                                GMAR
                                GMAR
                                FT Vest U.S. Equity Moderate Buffer ETF - March
                             | 
                            
                                March
                             | 
                            
                                SPY
                             | 
                            
                                S&P 500® Index
                             | 
                            
                                14.46%
                             | 
                            
                                14.53%
                             | 
                            
                                30.73%
                             | 
                            
                                0.35
                             | 
                            
                                4.85%
                             | 
                            
                                11.86%
                             | 
                            
                                -3.76%
                             | 
                            
                                -10.29%
                             | 
                            
                                03/20/23
                             | 
                            
                                03/15/24
                             | 
                        
                    
                        
                            | 
                                GMAR
                                GMAR
                                FT Vest U.S. Equity Moderate Buffer ETF - March
                             | 
                            
                                March
                             | 
                            
                                SPY
                             | 
                            
                                S&P 500® Index
                             | 
                            
                                13.51%
                             | 
                            
                                9.81%
                             | 
                            
                                10.62%
                             | 
                            
                                0.47
                             | 
                            
                                7.06%
                             | 
                            
                                13.56%
                             | 
                            
                                -5.06%
                             | 
                            
                                -10.04%
                             | 
                            
                                03/18/24
                             | 
                            
                                03/21/25
                             | 
                        
                    
                        
                            | 
                                GMAY
                                GMAY
                                FT Vest U.S. Equity Moderate Buffer ETF - May
                             | 
                            
                                May
                             | 
                            
                                SPY
                             | 
                            
                                S&P 500® Index
                             | 
                            
                                13.75%
                             | 
                            
                                13.80%
                             | 
                            
                                26.48%
                             | 
                            
                                0.38
                             | 
                            
                                5.24%
                             | 
                            
                                11.60%
                             | 
                            
                                -5.01%
                             | 
                            
                                -10.29%
                             | 
                            
                                05/22/23
                             | 
                            
                                05/17/24
                             | 
                        
                    
                        
                            | 
                                GMAY
                                GMAY
                                FT Vest U.S. Equity Moderate Buffer ETF - May
                             | 
                            
                                May
                             | 
                            
                                SPY
                             | 
                            
                                S&P 500® Index
                             | 
                            
                                12.75%
                             | 
                            
                                11.45%
                             | 
                            
                                12.23%
                             | 
                            
                                0.57
                             | 
                            
                                11.62%
                             | 
                            
                                20.34%
                             | 
                            
                                -10.62%
                             | 
                            
                                -19.00%
                             | 
                            
                                05/20/24
                             | 
                            
                                05/16/25
                             | 
                        
                    
                        
                            | 
                                GNOV
                                GNOV
                                FT Vest U.S. Equity Moderate Buffer ETF - November
                             | 
                            
                                November
                             | 
                            
                                SPY
                             | 
                            
                                S&P 500® Index
                             | 
                            
                                13.43%
                             | 
                            
                                13.46%
                             | 
                            
                                29.94%
                             | 
                            
                                0.28
                             | 
                            
                                4.00%
                             | 
                            
                                12.26%
                             | 
                            
                                -2.51%
                             | 
                            
                                -8.41%
                             | 
                            
                                11/20/23
                             | 
                            
                                11/15/24
                             | 
                        
                    
                        
                            | 
                                GOCT
                                GOCT
                                FT Vest U.S. Equity Moderate Buffer ETF - October
                             | 
                            
                                October
                             | 
                            
                                SPY
                             | 
                            
                                S&P 500® Index
                             | 
                            
                                14.66%
                             | 
                            
                                14.68%
                             | 
                            
                                38.79%
                             | 
                            
                                0.24
                             | 
                            
                                3.66%
                             | 
                            
                                12.32%
                             | 
                            
                                -1.70%
                             | 
                            
                                -8.41%
                             | 
                            
                                10/23/23
                             | 
                            
                                10/18/24
                             | 
                        
                    
                        
                            | 
                                GOCT
                                GOCT
                                FT Vest U.S. Equity Moderate Buffer ETF - October
                             | 
                            
                                October
                             | 
                            
                                SPY
                             | 
                            
                                S&P 500® Index
                             | 
                            
                                10.82%
                             | 
                            
                                10.90%
                             | 
                            
                                13.65%
                             | 
                            
                                0.54
                             | 
                            
                                10.30%
                             | 
                            
                                19.67%
                             | 
                            
                                -10.41%
                             | 
                            
                                -19.00%
                             | 
                            
                                10/21/24
                             | 
                            
                                10/17/25
                             | 
                        
                    
                        
                            | 
                                GSEP
                                GSEP
                                FT Vest U.S. Equity Moderate Buffer ETF - September
                             | 
                            
                                September
                             | 
                            
                                SPY
                             | 
                            
                                S&P 500® Index
                             | 
                            
                                13.90%
                             | 
                            
                                13.95%
                             | 
                            
                                28.17%
                             | 
                            
                                0.36
                             | 
                            
                                5.35%
                             | 
                            
                                12.68%
                             | 
                            
                                -3.88%
                             | 
                            
                                -8.41%
                             | 
                            
                                09/18/23
                             | 
                            
                                09/20/24
                             | 
                        
                    
                        
                            | 
                                GSEP
                                GSEP
                                FT Vest U.S. Equity Moderate Buffer ETF - September
                             | 
                            
                                September
                             | 
                            
                                SPY
                             | 
                            
                                S&P 500® Index
                             | 
                            
                                10.46%
                             | 
                            
                                10.54%
                             | 
                            
                                16.80%
                             | 
                            
                                0.52
                             | 
                            
                                9.89%
                             | 
                            
                                19.49%
                             | 
                            
                                -10.06%
                             | 
                            
                                -19.00%
                             | 
                            
                                09/23/24
                             | 
                            
                                09/19/25
                             | 
                        
                    
                        
                            | 
                                JULM
                                JULM
                                FT Vest U.S. Equity Max Buffer ETF - July
                             | 
                            
                                July
                             | 
                            
                                SPY
                             | 
                            
                                S&P 500® Index
                             | 
                            
                                7.61%
                             | 
                            
                                7.65%
                             | 
                            
                                15.95%
                             | 
                            
                                0.24
                             | 
                            
                                4.94%
                             | 
                            
                                20.46%
                             | 
                            
                                -4.52%
                             | 
                            
                                -19.00%
                             | 
                            
                                07/25/24
                             | 
                            
                                07/18/25
                             | 
                        
                    
                        
                            | 
                                JUNM
                                JUNM
                                FT Vest U.S. Equity Max Buffer ETF - June
                             | 
                            
                                June
                             | 
                            
                                SPY
                             | 
                            
                                S&P 500® Index
                             | 
                            
                                8.23%
                             | 
                            
                                8.25%
                             | 
                            
                                9.14%
                             | 
                            
                                0.28
                             | 
                            
                                6.07%
                             | 
                            
                                20.54%
                             | 
                            
                                -5.48%
                             | 
                            
                                -19.00%
                             | 
                            
                                06/24/24
                             | 
                            
                                06/20/25
                             | 
                        
                    
                        
                            | 
                                MARM
                                MARM
                                FT Vest U.S. Equity Max Buffer ETF - March
                             | 
                            
                                March
                             | 
                            
                                SPY
                             | 
                            
                                S&P 500® Index
                             | 
                            
                                8.39%
                             | 
                            
                                7.92%
                             | 
                            
                                8.71%
                             | 
                            
                                0.25
                             | 
                            
                                4.08%
                             | 
                            
                                13.70%
                             | 
                            
                                -2.72%
                             | 
                            
                                -10.04%
                             | 
                            
                                03/27/24
                             | 
                            
                                03/21/25
                             | 
                        
                    
                        
                            | 
                                OCTM
                                OCTM
                                FT Vest U.S. Equity Max Buffer ETF - October
                             | 
                            
                                October
                             | 
                            
                                SPY
                             | 
                            
                                S&P 500® Index
                             | 
                            
                                6.20%
                             | 
                            
                                6.26%
                             | 
                            
                                13.65%
                             | 
                            
                                0.17
                             | 
                            
                                3.42%
                             | 
                            
                                19.67%
                             | 
                            
                                -3.36%
                             | 
                            
                                -19.00%
                             | 
                            
                                10/21/24
                             | 
                            
                                10/17/25
                             | 
                        
                    
                        
                            | 
                                QCAP
                                QCAP
                                FT Vest Nasdaq-100® Conservative Buffer ETF - April
                             | 
                            
                                April
                             | 
                            
                                QQQ
                             | 
                            
                                Nasdaq-100 Index®
                             | 
                            
                                14.31%
                             | 
                            
                                6.22%
                             | 
                            
                                7.10%
                             | 
                            
                                0.44
                             | 
                            
                                12.15%
                             | 
                            
                                24.89%
                             | 
                            
                                -9.19%
                             | 
                            
                                -22.88%
                             | 
                            
                                04/22/24
                             | 
                            
                                04/17/25
                             | 
                        
                    
                        
                            | 
                                QCJL
                                QCJL
                                FT Vest Nasdaq-100® Conservative Buffer ETF - July
                             | 
                            
                                July
                             | 
                            
                                QQQ
                             | 
                            
                                Nasdaq-100 Index®
                             | 
                            
                                13.11%
                             | 
                            
                                13.16%
                             | 
                            
                                18.10%
                             | 
                            
                                0.45
                             | 
                            
                                11.58%
                             | 
                            
                                25.34%
                             | 
                            
                                -10.99%
                             | 
                            
                                -22.88%
                             | 
                            
                                07/22/24
                             | 
                            
                                07/18/25
                             | 
                        
                    
                        
                            | 
                                QCOC
                                QCOC
                                FT Vest Nasdaq-100® Conservative Buffer ETF - October
                             | 
                            
                                October
                             | 
                            
                                QQQ
                             | 
                            
                                Nasdaq-100 Index®
                             | 
                            
                                11.60%
                             | 
                            
                                11.66%
                             | 
                            
                                22.14%
                             | 
                            
                                0.42
                             | 
                            
                                10.30%
                             | 
                            
                                23.72%
                             | 
                            
                                -10.29%
                             | 
                            
                                -22.88%
                             | 
                            
                                10/21/24
                             | 
                            
                                10/17/25
                             | 
                        
                    
                        
                            | 
                                QDEC
                                QDEC
                                FT Vest Nasdaq-100® Buffer ETF - December
                             | 
                            
                                December
                             | 
                            
                                QQQ
                             | 
                            
                                Nasdaq-100 Index®
                             | 
                            
                                16.14%
                             | 
                            
                                16.20%
                             | 
                            
                                24.14%
                             | 
                            
                                0.48
                             | 
                            
                                10.11%
                             | 
                            
                                18.00%
                             | 
                            
                                -6.45%
                             | 
                            
                                -10.85%
                             | 
                            
                                12/21/20
                             | 
                            
                                12/17/21
                             | 
                        
                    
                        
                            | 
                                QDEC
                                QDEC
                                FT Vest Nasdaq-100® Buffer ETF - December
                             | 
                            
                                December
                             | 
                            
                                QQQ
                             | 
                            
                                Nasdaq-100 Index®
                             | 
                            
                                14.99%
                             | 
                            
                                -19.43%
                             | 
                            
                                -28.75%
                             | 
                            
                                0.74
                             | 
                            
                                24.43%
                             | 
                            
                                32.03%
                             | 
                            
                                -25.15%
                             | 
                            
                                -35.44%
                             | 
                            
                                12/20/21
                             | 
                            
                                12/16/22
                             | 
                        
                    
                        
                            | 
                                QDEC
                                QDEC
                                FT Vest Nasdaq-100® Buffer ETF - December
                             | 
                            
                                December
                             | 
                            
                                QQQ
                             | 
                            
                                Nasdaq-100 Index®
                             | 
                            
                                26.13%
                             | 
                            
                                26.18%
                             | 
                            
                                47.80%
                             | 
                            
                                0.44
                             | 
                            
                                9.16%
                             | 
                            
                                18.35%
                             | 
                            
                                -4.45%
                             | 
                            
                                -10.91%
                             | 
                            
                                12/19/22
                             | 
                            
                                12/15/23
                             | 
                        
                    
                        
                            | 
                                QDEC
                                QDEC
                                FT Vest Nasdaq-100® Buffer ETF - December
                             | 
                            
                                December
                             | 
                            
                                QQQ
                             | 
                            
                                Nasdaq-100 Index®
                             | 
                            
                                18.07%
                             | 
                            
                                18.14%
                             | 
                            
                                28.02%
                             | 
                            
                                0.44
                             | 
                            
                                8.58%
                             | 
                            
                                17.83%
                             | 
                            
                                -6.23%
                             | 
                            
                                -13.56%
                             | 
                            
                                12/18/23
                             | 
                            
                                12/20/24
                             | 
                        
                    
                        
                            | 
                                QJUN
                                QJUN
                                FT Vest Nasdaq-100® Buffer ETF - June
                             | 
                            
                                June
                             | 
                            
                                QQQ
                             | 
                            
                                Nasdaq-100 Index®
                             | 
                            
                                12.10%
                             | 
                            
                                -10.67%
                             | 
                            
                                -19.83%
                             | 
                            
                                0.55
                             | 
                            
                                15.42%
                             | 
                            
                                26.20%
                             | 
                            
                                -18.29%
                             | 
                            
                                -32.82%
                             | 
                            
                                06/21/21
                             | 
                            
                                06/17/22
                             | 
                        
                    
                        
                            | 
                                QJUN
                                QJUN
                                FT Vest Nasdaq-100® Buffer ETF - June
                             | 
                            
                                June
                             | 
                            
                                QQQ
                             | 
                            
                                Nasdaq-100 Index®
                             | 
                            
                                24.31%
                             | 
                            
                                24.41%
                             | 
                            
                                33.94%
                             | 
                            
                                0.63
                             | 
                            
                                16.89%
                             | 
                            
                                25.75%
                             | 
                            
                                -12.83%
                             | 
                            
                                -21.91%
                             | 
                            
                                06/21/22
                             | 
                            
                                06/16/23
                             | 
                        
                    
                        
                            | 
                                QJUN
                                QJUN
                                FT Vest Nasdaq-100® Buffer ETF - June
                             | 
                            
                                June
                             | 
                            
                                QQQ
                             | 
                            
                                Nasdaq-100 Index®
                             | 
                            
                                19.62%
                             | 
                            
                                19.71%
                             | 
                            
                                30.51%
                             | 
                            
                                0.57
                             | 
                            
                                9.46%
                             | 
                            
                                15.64%
                             | 
                            
                                -6.73%
                             | 
                            
                                -10.91%
                             | 
                            
                                06/20/23
                             | 
                            
                                06/21/24
                             | 
                        
                    
                        
                            | 
                                QJUN
                                QJUN
                                FT Vest Nasdaq-100® Buffer ETF - June
                             | 
                            
                                June
                             | 
                            
                                QQQ
                             | 
                            
                                Nasdaq-100 Index®
                             | 
                            
                                18.40%
                             | 
                            
                                8.93%
                             | 
                            
                                9.72%
                             | 
                            
                                0.66
                             | 
                            
                                17.12%
                             | 
                            
                                25.64%
                             | 
                            
                                -16.27%
                             | 
                            
                                -22.88%
                             | 
                            
                                06/24/24
                             | 
                            
                                06/20/25
                             | 
                        
                    
                        
                            | 
                                QMAG
                                QMAG
                                FT Vest Nasdaq-100® Moderate Buffer ETF - August
                             | 
                            
                                August
                             | 
                            
                                QQQ
                             | 
                            
                                Nasdaq-100 Index®
                             | 
                            
                                13.80%
                             | 
                            
                                13.85%
                             | 
                            
                                21.54%
                             | 
                            
                                0.51
                             | 
                            
                                12.64%
                             | 
                            
                                24.11%
                             | 
                            
                                -12.33%
                             | 
                            
                                -22.88%
                             | 
                            
                                08/19/24
                             | 
                            
                                08/15/25
                             | 
                        
                    
                        
                            | 
                                QMAR
                                QMAR
                                FT Vest Nasdaq-100® Buffer ETF - March
                             | 
                            
                                March
                             | 
                            
                                QQQ
                             | 
                            
                                Nasdaq-100 Index®
                             | 
                            
                                14.61%
                             | 
                            
                                11.42%
                             | 
                            
                                12.25%
                             | 
                            
                                0.48
                             | 
                            
                                11.19%
                             | 
                            
                                20.45%
                             | 
                            
                                -10.15%
                             | 
                            
                                -21.24%
                             | 
                            
                                03/22/21
                             | 
                            
                                03/18/22
                             | 
                        
                    
                        
                            | 
                                QMAR
                                QMAR
                                FT Vest Nasdaq-100® Buffer ETF - March
                             | 
                            
                                March
                             | 
                            
                                QQQ
                             | 
                            
                                Nasdaq-100 Index®
                             | 
                            
                                16.35%
                             | 
                            
                                -3.81%
                             | 
                            
                                -13.12%
                             | 
                            
                                0.70
                             | 
                            
                                21.90%
                             | 
                            
                                30.61%
                             | 
                            
                                -19.79%
                             | 
                            
                                -29.93%
                             | 
                            
                                03/21/22
                             | 
                            
                                03/17/23
                             | 
                        
                    
                        
                            | 
                                QMAR
                                QMAR
                                FT Vest Nasdaq-100® Buffer ETF - March
                             | 
                            
                                March
                             | 
                            
                                QQQ
                             | 
                            
                                Nasdaq-100 Index®
                             | 
                            
                                21.25%
                             | 
                            
                                21.32%
                             | 
                            
                                42.17%
                             | 
                            
                                0.35
                             | 
                            
                                6.98%
                             | 
                            
                                16.24%
                             | 
                            
                                -3.73%
                             | 
                            
                                -10.91%
                             | 
                            
                                03/20/23
                             | 
                            
                                03/15/24
                             | 
                        
                    
                        
                            | 
                                QMAR
                                QMAR
                                FT Vest Nasdaq-100® Buffer ETF - March
                             | 
                            
                                March
                             | 
                            
                                QQQ
                             | 
                            
                                Nasdaq-100 Index®
                             | 
                            
                                19.98%
                             | 
                            
                                9.97%
                             | 
                            
                                10.81%
                             | 
                            
                                0.59
                             | 
                            
                                12.03%
                             | 
                            
                                19.19%
                             | 
                            
                                -9.53%
                             | 
                            
                                -13.56%
                             | 
                            
                                03/18/24
                             | 
                            
                                03/21/25
                             | 
                        
                    
                        
                            | 
                                QMMY
                                QMMY
                                FT Vest Nasdaq-100® Moderate Buffer ETF - May
                             | 
                            
                                May
                             | 
                            
                                QQQ
                             | 
                            
                                Nasdaq-100 Index®
                             | 
                            
                                15.03%
                             | 
                            
                                14.57%
                             | 
                            
                                15.44%
                             | 
                            
                                0.52
                             | 
                            
                                13.88%
                             | 
                            
                                25.55%
                             | 
                            
                                -12.71%
                             | 
                            
                                -22.88%
                             | 
                            
                                05/20/24
                             | 
                            
                                05/16/25
                             | 
                        
                    
                        
                            | 
                                QSPT
                                QSPT
                                FT Vest Nasdaq-100® Buffer ETF - September
                             | 
                            
                                September
                             | 
                            
                                QQQ
                             | 
                            
                                Nasdaq-100 Index®
                             | 
                            
                                12.75%
                             | 
                            
                                -13.38%
                             | 
                            
                                -22.61%
                             | 
                            
                                0.68
                             | 
                            
                                20.66%
                             | 
                            
                                29.34%
                             | 
                            
                                -21.65%
                             | 
                            
                                -32.82%
                             | 
                            
                                09/20/21
                             | 
                            
                                09/16/22
                             | 
                        
                    
                        
                            | 
                                QSPT
                                QSPT
                                FT Vest Nasdaq-100® Buffer ETF - September
                             | 
                            
                                September
                             | 
                            
                                QQQ
                             | 
                            
                                Nasdaq-100 Index®
                             | 
                            
                                26.37%
                             | 
                            
                                26.47%
                             | 
                            
                                28.17%
                             | 
                            
                                0.65
                             | 
                            
                                15.63%
                             | 
                            
                                23.04%
                             | 
                            
                                -7.75%
                             | 
                            
                                -11.45%
                             | 
                            
                                09/19/22
                             | 
                            
                                09/15/23
                             | 
                        
                    
                        
                            | 
                                QSPT
                                QSPT
                                FT Vest Nasdaq-100® Buffer ETF - September
                             | 
                            
                                September
                             | 
                            
                                QQQ
                             | 
                            
                                Nasdaq-100 Index®
                             | 
                            
                                20.09%
                             | 
                            
                                20.15%
                             | 
                            
                                30.16%
                             | 
                            
                                0.42
                             | 
                            
                                8.36%
                             | 
                            
                                17.75%
                             | 
                            
                                -4.80%
                             | 
                            
                                -13.56%
                             | 
                            
                                09/18/23
                             | 
                            
                                09/20/24
                             | 
                        
                    
                        
                            | 
                                QSPT
                                QSPT
                                FT Vest Nasdaq-100® Buffer ETF - September
                             | 
                            
                                September
                             | 
                            
                                QQQ
                             | 
                            
                                Nasdaq-100 Index®
                             | 
                            
                                16.44%
                             | 
                            
                                16.53%
                             | 
                            
                                24.23%
                             | 
                            
                                0.63
                             | 
                            
                                15.02%
                             | 
                            
                                23.48%
                             | 
                            
                                -15.07%
                             | 
                            
                                -22.88%
                             | 
                            
                                09/23/24
                             | 
                            
                                09/19/25
                             | 
                        
                    
                        
                            | 
                                RSJN
                                RSJN
                                FT Vest U.S. Equity Equal Weight Buffer ETF - June
                             | 
                            
                                June
                             | 
                            
                                RSP
                             | 
                            
                                S&P 500® Equal Weight Index
                             | 
                            
                                18.18%
                             | 
                            
                                6.55%
                             | 
                            
                                7.28%
                             | 
                            
                                0.68
                             | 
                            
                                12.30%
                             | 
                            
                                17.55%
                             | 
                            
                                -12.06%
                             | 
                            
                                -18.49%
                             | 
                            
                                06/24/24
                             | 
                            
                                06/20/25
                             | 
                        
                    
                        
                            | 
                                RSSE
                                RSSE
                                FT Vest U.S. Equity Equal Weight Buffer ETF - September
                             | 
                            
                                September
                             | 
                            
                                RSP
                             | 
                            
                                S&P 500® Equal Weight Index
                             | 
                            
                                13.86%
                             | 
                            
                                5.93%
                             | 
                            
                                6.63%
                             | 
                            
                                0.65
                             | 
                            
                                11.52%
                             | 
                            
                                17.16%
                             | 
                            
                                -11.29%
                             | 
                            
                                -18.49%
                             | 
                            
                                09/23/24
                             | 
                            
                                09/19/25
                             | 
                        
                    
                        
                            | 
                                SAUG
                                SAUG
                                FT Vest U.S. Small Cap Moderate Buffer ETF - August
                             | 
                            
                                August
                             | 
                            
                                IWM
                             | 
                            
                                Russell 2000® Index
                             | 
                            
                                18.17%
                             | 
                            
                                14.33%
                             | 
                            
                                15.14%
                             | 
                            
                                0.60
                             | 
                            
                                12.78%
                             | 
                            
                                21.05%
                             | 
                            
                                -8.42%
                             | 
                            
                                -15.01%
                             | 
                            
                                08/21/23
                             | 
                            
                                08/16/24
                             | 
                        
                    
                        
                            | 
                                SAUG
                                SAUG
                                FT Vest U.S. Small Cap Moderate Buffer ETF - August
                             | 
                            
                                August
                             | 
                            
                                IWM
                             | 
                            
                                Russell 2000® Index
                             | 
                            
                                16.37%
                             | 
                            
                                6.06%
                             | 
                            
                                6.83%
                             | 
                            
                                0.54
                             | 
                            
                                12.98%
                             | 
                            
                                23.45%
                             | 
                            
                                -14.36%
                             | 
                            
                                -27.88%
                             | 
                            
                                08/19/24
                             | 
                            
                                08/15/25
                             | 
                        
                    
                        
                            | 
                                SEPM
                                SEPM
                                FT Vest U.S. Equity Max Buffer ETF - September
                             | 
                            
                                September
                             | 
                            
                                SPY
                             | 
                            
                                S&P 500® Index
                             | 
                            
                                6.15%
                             | 
                            
                                6.20%
                             | 
                            
                                16.80%
                             | 
                            
                                0.21
                             | 
                            
                                4.04%
                             | 
                            
                                19.49%
                             | 
                            
                                -3.97%
                             | 
                            
                                -19.00%
                             | 
                            
                                09/23/24
                             | 
                            
                                09/19/25
                             | 
                        
                    
                        
                            | 
                                SFEB
                                SFEB
                                FT Vest U.S. Small Cap Moderate Buffer ETF - February
                             | 
                            
                                February
                             | 
                            
                                IWM
                             | 
                            
                                Russell 2000® Index
                             | 
                            
                                18.37%
                             | 
                            
                                7.20%
                             | 
                            
                                8.00%
                             | 
                            
                                0.58
                             | 
                            
                                11.84%
                             | 
                            
                                19.86%
                             | 
                            
                                -5.69%
                             | 
                            
                                -10.55%
                             | 
                            
                                02/20/24
                             | 
                            
                                02/21/25
                             | 
                        
                    
                        
                            | 
                                SMAY
                                SMAY
                                FT Vest U.S. Small Cap Moderate Buffer ETF - May
                             | 
                            
                                May
                             | 
                            
                                IWM
                             | 
                            
                                Russell 2000® Index
                             | 
                            
                                16.86%
                             | 
                            
                                16.95%
                             | 
                            
                                18.15%
                             | 
                            
                                0.55
                             | 
                            
                                11.08%
                             | 
                            
                                19.66%
                             | 
                            
                                -9.21%
                             | 
                            
                                -18.37%
                             | 
                            
                                05/22/23
                             | 
                            
                                05/17/24
                             | 
                        
                    
                        
                            | 
                                SMAY
                                SMAY
                                FT Vest U.S. Small Cap Moderate Buffer ETF - May
                             | 
                            
                                May
                             | 
                            
                                IWM
                             | 
                            
                                Russell 2000® Index
                             | 
                            
                                17.03%
                             | 
                            
                                0.08%
                             | 
                            
                                0.85%
                             | 
                            
                                0.47
                             | 
                            
                                11.85%
                             | 
                            
                                24.40%
                             | 
                            
                                -14.07%
                             | 
                            
                                -27.88%
                             | 
                            
                                05/20/24
                             | 
                            
                                05/16/25
                             | 
                        
                    
                        
                            | 
                                SNOV
                                SNOV
                                FT Vest U.S. Small Cap Moderate Buffer ETF - November
                             | 
                            
                                November
                             | 
                            
                                IWM
                             | 
                            
                                Russell 2000® Index
                             | 
                            
                                17.02%
                             | 
                            
                                17.07%
                             | 
                            
                                28.15%
                             | 
                            
                                0.36
                             | 
                            
                                8.09%
                             | 
                            
                                21.11%
                             | 
                            
                                -4.13%
                             | 
                            
                                -10.07%
                             | 
                            
                                11/20/23
                             | 
                            
                                11/15/24
                             | 
                        
                    
                        
                            | 
                                TSEP
                                TSEP
                                FT Vest Emerging Markets Buffer ETF - September
                             | 
                            
                                September
                             | 
                            
                                EEM
                             | 
                            
                                MSCI Emerging Markets Index
                             | 
                            
                                15.30%
                             | 
                            
                                15.45%
                             | 
                            
                                21.33%
                             | 
                            
                                0.42
                             | 
                            
                                11.92%
                             | 
                            
                                18.56%
                             | 
                            
                                -9.97%
                             | 
                            
                                -18.67%
                             | 
                            
                                09/23/24
                             | 
                            
                                09/19/25
                             | 
                        
                    
                        
                            | 
                                XAPR
                                XAPR
                                FT Vest U.S. Equity Enhance & Moderate Buffer ETF - April
                             | 
                            
                                April
                             | 
                            
                                SPY
                             | 
                            
                                S&P 500® Index
                             | 
                            
                                11.18%
                             | 
                            
                                11.20%
                             | 
                            
                                6.31%
                             | 
                            
                                0.38
                             | 
                            
                                8.35%
                             | 
                            
                                19.72%
                             | 
                            
                                -6.05%
                             | 
                            
                                -19.00%
                             | 
                            
                                04/22/24
                             | 
                            
                                04/17/25
                             | 
                        
                    
                        
                            | 
                                XAUG
                                XAUG
                                FT Vest U.S. Equity Enhance & Moderate Buffer ETF - August
                             | 
                            
                                August
                             | 
                            
                                SPY
                             | 
                            
                                S&P 500® Index
                             | 
                            
                                11.48%
                             | 
                            
                                11.51%
                             | 
                            
                                26.99%
                             | 
                            
                                0.24
                             | 
                            
                                4.05%
                             | 
                            
                                12.56%
                             | 
                            
                                -4.11%
                             | 
                            
                                -8.98%
                             | 
                            
                                08/21/23
                             | 
                            
                                08/16/24
                             | 
                        
                    
                        
                            | 
                                XAUG
                                XAUG
                                FT Vest U.S. Equity Enhance & Moderate Buffer ETF - August
                             | 
                            
                                August
                             | 
                            
                                SPY
                             | 
                            
                                S&P 500® Index
                             | 
                            
                                9.09%
                             | 
                            
                                9.17%
                             | 
                            
                                16.08%
                             | 
                            
                                0.47
                             | 
                            
                                9.25%
                             | 
                            
                                19.78%
                             | 
                            
                                -8.73%
                             | 
                            
                                -19.00%
                             | 
                            
                                08/19/24
                             | 
                            
                                08/15/25
                             | 
                        
                    
                        
                            | 
                                XDEC
                                XDEC
                                FT Vest U.S. Equity Enhance & Moderate Buffer ETF - December
                             | 
                            
                                December
                             | 
                            
                                SPY
                             | 
                            
                                S&P 500® Index
                             | 
                            
                                7.73%
                             | 
                            
                                -2.40%
                             | 
                            
                                -16.66%
                             | 
                            
                                0.49
                             | 
                            
                                12.60%
                             | 
                            
                                24.23%
                             | 
                            
                                -11.85%
                             | 
                            
                                -25.36%
                             | 
                            
                                12/20/21
                             | 
                            
                                12/16/22
                             | 
                        
                    
                        
                            | 
                                XDEC
                                XDEC
                                FT Vest U.S. Equity Enhance & Moderate Buffer ETF - December
                             | 
                            
                                December
                             | 
                            
                                SPY
                             | 
                            
                                S&P 500® Index
                             | 
                            
                                14.45%
                             | 
                            
                                14.51%
                             | 
                            
                                22.45%
                             | 
                            
                                0.37
                             | 
                            
                                5.57%
                             | 
                            
                                13.45%
                             | 
                            
                                -2.90%
                             | 
                            
                                -10.29%
                             | 
                            
                                12/19/22
                             | 
                            
                                12/15/23
                             | 
                        
                    
                        
                            | 
                                XDEC
                                XDEC
                                FT Vest U.S. Equity Enhance & Moderate Buffer ETF - December
                             | 
                            
                                December
                             | 
                            
                                SPY
                             | 
                            
                                S&P 500® Index
                             | 
                            
                                9.90%
                             | 
                            
                                9.96%
                             | 
                            
                                25.96%
                             | 
                            
                                0.22
                             | 
                            
                                3.53%
                             | 
                            
                                12.49%
                             | 
                            
                                -2.26%
                             | 
                            
                                -8.41%
                             | 
                            
                                12/18/23
                             | 
                            
                                12/20/24
                             | 
                        
                    
                        
                            | 
                                XFEB
                                XFEB
                                FT Vest U.S. Equity Enhance & Moderate Buffer ETF - February
                             | 
                            
                                February
                             | 
                            
                                SPY
                             | 
                            
                                S&P 500® Index
                             | 
                            
                                10.16%
                             | 
                            
                                10.23%
                             | 
                            
                                20.11%
                             | 
                            
                                0.26
                             | 
                            
                                4.02%
                             | 
                            
                                12.75%
                             | 
                            
                                -2.93%
                             | 
                            
                                -8.41%
                             | 
                            
                                02/20/24
                             | 
                            
                                02/21/25
                             | 
                        
                    
                        
                            | 
                                XJAN
                                XJAN
                                FT Vest U.S. Equity Enhance & Moderate Buffer ETF - January
                             | 
                            
                                January
                             | 
                            
                                SPY
                             | 
                            
                                S&P 500® Index
                             | 
                            
                                9.59%
                             | 
                            
                                9.65%
                             | 
                            
                                23.87%
                             | 
                            
                                0.21
                             | 
                            
                                3.48%
                             | 
                            
                                12.78%
                             | 
                            
                                -2.39%
                             | 
                            
                                -8.41%
                             | 
                            
                                01/22/24
                             | 
                            
                                01/17/25
                             | 
                        
                    
                        
                            | 
                                XJUL
                                XJUL
                                FT Vest U.S. Equity Enhance & Moderate Buffer ETF - July
                             | 
                            
                                July
                             | 
                            
                                SPY
                             | 
                            
                                S&P 500® Index
                             | 
                            
                                10.37%
                             | 
                            
                                10.42%
                             | 
                            
                                21.41%
                             | 
                            
                                0.37
                             | 
                            
                                4.97%
                             | 
                            
                                11.36%
                             | 
                            
                                -4.70%
                             | 
                            
                                -10.29%
                             | 
                            
                                07/24/23
                             | 
                            
                                07/19/24
                             | 
                        
                    
                        
                            | 
                                XJUL
                                XJUL
                                FT Vest U.S. Equity Enhance & Moderate Buffer ETF - July
                             | 
                            
                                July
                             | 
                            
                                SPY
                             | 
                            
                                S&P 500® Index
                             | 
                            
                                9.88%
                             | 
                            
                                9.94%
                             | 
                            
                                14.32%
                             | 
                            
                                0.49
                             | 
                            
                                10.18%
                             | 
                            
                                20.50%
                             | 
                            
                                -9.04%
                             | 
                            
                                -19.00%
                             | 
                            
                                07/22/24
                             | 
                            
                                07/18/25
                             | 
                        
                    
                        
                            | 
                                XJUN
                                XJUN
                                FT Vest U.S. Equity Enhance & Moderate Buffer ETF - June
                             | 
                            
                                June
                             | 
                            
                                SPY
                             | 
                            
                                S&P 500® Index
                             | 
                            
                                5.37%
                             | 
                            
                                -2.04%
                             | 
                            
                                -16.29%
                             | 
                            
                                0.34
                             | 
                            
                                7.29%
                             | 
                            
                                19.84%
                             | 
                            
                                -5.62%
                             | 
                            
                                -23.41%
                             | 
                            
                                07/13/21
                             | 
                            
                                06/17/22
                             | 
                        
                    
                        
                            | 
                                XJUN
                                XJUN
                                FT Vest U.S. Equity Enhance & Moderate Buffer ETF - June
                             | 
                            
                                June
                             | 
                            
                                SPY
                             | 
                            
                                S&P 500® Index
                             | 
                            
                                13.95%
                             | 
                            
                                13.97%
                             | 
                            
                                20.12%
                             | 
                            
                                0.38
                             | 
                            
                                8.12%
                             | 
                            
                                19.99%
                             | 
                            
                                -6.54%
                             | 
                            
                                -17.02%
                             | 
                            
                                06/21/22
                             | 
                            
                                06/16/23
                             | 
                        
                    
                        
                            | 
                                XJUN
                                XJUN
                                FT Vest U.S. Equity Enhance & Moderate Buffer ETF - June
                             | 
                            
                                June
                             | 
                            
                                SPY
                             | 
                            
                                S&P 500® Index
                             | 
                            
                                10.74%
                             | 
                            
                                10.81%
                             | 
                            
                                23.90%
                             | 
                            
                                0.34
                             | 
                            
                                4.77%
                             | 
                            
                                11.29%
                             | 
                            
                                -4.48%
                             | 
                            
                                -10.29%
                             | 
                            
                                06/20/23
                             | 
                            
                                06/21/24
                             | 
                        
                    
                        
                            | 
                                XJUN
                                XJUN
                                FT Vest U.S. Equity Enhance & Moderate Buffer ETF - June
                             | 
                            
                                June
                             | 
                            
                                SPY
                             | 
                            
                                S&P 500® Index
                             | 
                            
                                9.85%
                             | 
                            
                                9.91%
                             | 
                            
                                9.14%
                             | 
                            
                                0.50
                             | 
                            
                                10.32%
                             | 
                            
                                20.54%
                             | 
                            
                                -8.98%
                             | 
                            
                                -19.00%
                             | 
                            
                                06/24/24
                             | 
                            
                                06/20/25
                             | 
                        
                    
                        
                            | 
                                XMAR
                                XMAR
                                FT Vest U.S. Equity Enhance & Moderate Buffer ETF - March
                             | 
                            
                                March
                             | 
                            
                                SPY
                             | 
                            
                                S&P 500® Index
                             | 
                            
                                12.16%
                             | 
                            
                                12.27%
                             | 
                            
                                30.73%
                             | 
                            
                                0.24
                             | 
                            
                                3.49%
                             | 
                            
                                11.86%
                             | 
                            
                                -2.18%
                             | 
                            
                                -10.29%
                             | 
                            
                                03/20/23
                             | 
                            
                                03/15/24
                             | 
                        
                    
                        
                            | 
                                XMAR
                                XMAR
                                FT Vest U.S. Equity Enhance & Moderate Buffer ETF - March
                             | 
                            
                                March
                             | 
                            
                                SPY
                             | 
                            
                                S&P 500® Index
                             | 
                            
                                10.70%
                             | 
                            
                                10.74%
                             | 
                            
                                10.62%
                             | 
                            
                                0.29
                             | 
                            
                                4.72%
                             | 
                            
                                13.56%
                             | 
                            
                                -3.35%
                             | 
                            
                                -10.04%
                             | 
                            
                                03/18/24
                             | 
                            
                                03/21/25
                             | 
                        
                    
                        
                            | 
                                XMAY
                                XMAY
                                FT Vest U.S. Equity Enhance & Moderate Buffer ETF - May
                             | 
                            
                                May
                             | 
                            
                                SPY
                             | 
                            
                                S&P 500® Index
                             | 
                            
                                9.94%
                             | 
                            
                                10.00%
                             | 
                            
                                12.23%
                             | 
                            
                                0.48
                             | 
                            
                                10.03%
                             | 
                            
                                20.34%
                             | 
                            
                                -8.12%
                             | 
                            
                                -19.00%
                             | 
                            
                                05/20/24
                             | 
                            
                                05/16/25
                             | 
                        
                    
                        
                            | 
                                XNOV
                                XNOV
                                FT Vest U.S. Equity Enhance & Moderate Buffer ETF - November
                             | 
                            
                                November
                             | 
                            
                                SPY
                             | 
                            
                                S&P 500® Index
                             | 
                            
                                10.45%
                             | 
                            
                                10.49%
                             | 
                            
                                29.94%
                             | 
                            
                                0.18
                             | 
                            
                                2.86%
                             | 
                            
                                12.26%
                             | 
                            
                                -1.75%
                             | 
                            
                                -8.41%
                             | 
                            
                                11/20/23
                             | 
                            
                                11/15/24
                             | 
                        
                    
                        
                            | 
                                XOCT
                                XOCT
                                FT Vest U.S. Equity Enhance & Moderate Buffer ETF - October
                             | 
                            
                                October
                             | 
                            
                                SPY
                             | 
                            
                                S&P 500® Index
                             | 
                            
                                11.96%
                             | 
                            
                                11.98%
                             | 
                            
                                38.79%
                             | 
                            
                                0.17
                             | 
                            
                                2.81%
                             | 
                            
                                12.32%
                             | 
                            
                                -1.48%
                             | 
                            
                                -8.41%
                             | 
                            
                                10/23/23
                             | 
                            
                                10/18/24
                             | 
                        
                    
                        
                            | 
                                XOCT
                                XOCT
                                FT Vest U.S. Equity Enhance & Moderate Buffer ETF - October
                             | 
                            
                                October
                             | 
                            
                                SPY
                             | 
                            
                                S&P 500® Index
                             | 
                            
                                8.83%
                             | 
                            
                                8.91%
                             | 
                            
                                13.65%
                             | 
                            
                                0.50
                             | 
                            
                                9.87%
                             | 
                            
                                19.67%
                             | 
                            
                                -9.82%
                             | 
                            
                                -19.00%
                             | 
                            
                                10/21/24
                             | 
                            
                                10/17/25
                             | 
                        
                    
                        
                            | 
                                XSEP
                                XSEP
                                FT Vest U.S. Equity Enhance & Moderate Buffer ETF - September
                             | 
                            
                                September
                             | 
                            
                                SPY
                             | 
                            
                                S&P 500® Index
                             | 
                            
                                14.07%
                             | 
                            
                                14.10%
                             | 
                            
                                17.48%
                             | 
                            
                                0.40
                             | 
                            
                                7.71%
                             | 
                            
                                17.53%
                             | 
                            
                                -3.04%
                             | 
                            
                                -7.61%
                             | 
                            
                                09/22/22
                             | 
                            
                                09/15/23
                             | 
                        
                    
                        
                            | 
                                XSEP
                                XSEP
                                FT Vest U.S. Equity Enhance & Moderate Buffer ETF - September
                             | 
                            
                                September
                             | 
                            
                                SPY
                             | 
                            
                                S&P 500® Index
                             | 
                            
                                10.94%
                             | 
                            
                                10.99%
                             | 
                            
                                28.17%
                             | 
                            
                                0.25
                             | 
                            
                                4.25%
                             | 
                            
                                12.68%
                             | 
                            
                                -3.66%
                             | 
                            
                                -8.41%
                             | 
                            
                                09/18/23
                             | 
                            
                                09/20/24
                             | 
                        
                    
                        
                            | 
                                XSEP
                                XSEP
                                FT Vest U.S. Equity Enhance & Moderate Buffer ETF - September
                             | 
                            
                                September
                             | 
                            
                                SPY
                             | 
                            
                                S&P 500® Index
                             | 
                            
                                8.57%
                             | 
                            
                                8.65%
                             | 
                            
                                16.80%
                             | 
                            
                                0.48
                             | 
                            
                                9.34%
                             | 
                            
                                19.49%
                             | 
                            
                                -9.07%
                             | 
                            
                                -19.00%
                             | 
                            
                                09/23/24
                             | 
                            
                                09/19/25
                             | 
                        
                    
                        
                            | 
                                YDEC
                                YDEC
                                FT Vest International Equity Moderate Buffer ETF - December
                             | 
                            
                                December
                             | 
                            
                                EFA
                             | 
                            
                                MSCI EAFE Index
                             | 
                            
                                12.89%
                             | 
                            
                                4.65%
                             | 
                            
                                5.48%
                             | 
                            
                                0.49
                             | 
                            
                                8.57%
                             | 
                            
                                13.16%
                             | 
                            
                                -6.29%
                             | 
                            
                                -6.98%
                             | 
                            
                                12/21/20
                             | 
                            
                                12/17/21
                             | 
                        
                    
                        
                            | 
                                YDEC
                                YDEC
                                FT Vest International Equity Moderate Buffer ETF - December
                             | 
                            
                                December
                             | 
                            
                                EFA
                             | 
                            
                                MSCI EAFE Index
                             | 
                            
                                9.85%
                             | 
                            
                                -5.37%
                             | 
                            
                                -14.65%
                             | 
                            
                                0.58
                             | 
                            
                                16.72%
                             | 
                            
                                22.63%
                             | 
                            
                                -20.79%
                             | 
                            
                                -30.28%
                             | 
                            
                                12/20/21
                             | 
                            
                                12/16/22
                             | 
                        
                    
                        
                            | 
                                YDEC
                                YDEC
                                FT Vest International Equity Moderate Buffer ETF - December
                             | 
                            
                                December
                             | 
                            
                                EFA
                             | 
                            
                                MSCI EAFE Index
                             | 
                            
                                21.97%
                             | 
                            
                                12.94%
                             | 
                            
                                13.64%
                             | 
                            
                                0.64
                             | 
                            
                                11.07%
                             | 
                            
                                13.84%
                             | 
                            
                                -9.86%
                             | 
                            
                                -11.58%
                             | 
                            
                                12/19/22
                             | 
                            
                                12/15/23
                             | 
                        
                    
                        
                            | 
                                YDEC
                                YDEC
                                FT Vest International Equity Moderate Buffer ETF - December
                             | 
                            
                                December
                             | 
                            
                                EFA
                             | 
                            
                                MSCI EAFE Index
                             | 
                            
                                17.49%
                             | 
                            
                                0.23%
                             | 
                            
                                1.02%
                             | 
                            
                                0.55
                             | 
                            
                                10.57%
                             | 
                            
                                13.33%
                             | 
                            
                                -9.91%
                             | 
                            
                                -11.05%
                             | 
                            
                                12/18/23
                             | 
                            
                                12/20/24
                             | 
                        
                    
                        
                            | 
                                YJUN
                                YJUN
                                FT Vest International Equity Moderate Buffer ETF - June
                             | 
                            
                                June
                             | 
                            
                                EFA
                             | 
                            
                                MSCI EAFE Index
                             | 
                            
                                10.91%
                             | 
                            
                                -12.47%
                             | 
                            
                                -21.70%
                             | 
                            
                                0.52
                             | 
                            
                                12.83%
                             | 
                            
                                18.29%
                             | 
                            
                                -15.49%
                             | 
                            
                                -25.14%
                             | 
                            
                                06/21/21
                             | 
                            
                                06/17/22
                             | 
                        
                    
                        
                            | 
                                YJUN
                                YJUN
                                FT Vest International Equity Moderate Buffer ETF - June
                             | 
                            
                                June
                             | 
                            
                                EFA
                             | 
                            
                                MSCI EAFE Index
                             | 
                            
                                23.31%
                             | 
                            
                                18.65%
                             | 
                            
                                19.37%
                             | 
                            
                                0.62
                             | 
                            
                                14.77%
                             | 
                            
                                19.02%
                             | 
                            
                                -13.05%
                             | 
                            
                                -16.81%
                             | 
                            
                                06/21/22
                             | 
                            
                                06/16/23
                             | 
                        
                    
                        
                            | 
                                YJUN
                                YJUN
                                FT Vest International Equity Moderate Buffer ETF - June
                             | 
                            
                                June
                             | 
                            
                                EFA
                             | 
                            
                                MSCI EAFE Index
                             | 
                            
                                18.03%
                             | 
                            
                                5.50%
                             | 
                            
                                6.21%
                             | 
                            
                                0.62
                             | 
                            
                                11.18%
                             | 
                            
                                12.74%
                             | 
                            
                                -8.43%
                             | 
                            
                                -11.58%
                             | 
                            
                                06/20/23
                             | 
                            
                                06/21/24
                             | 
                        
                    
                        
                            | 
                                YJUN
                                YJUN
                                FT Vest International Equity Moderate Buffer ETF - June
                             | 
                            
                                June
                             | 
                            
                                EFA
                             | 
                            
                                MSCI EAFE Index
                             | 
                            
                                15.51%
                             | 
                            
                                9.95%
                             | 
                            
                                10.75%
                             | 
                            
                                0.30
                             | 
                            
                                11.80%
                             | 
                            
                                17.66%
                             | 
                            
                                -8.65%
                             | 
                            
                                -14.05%
                             | 
                            
                                06/24/24
                             | 
                            
                                06/20/25
                             | 
                        
                    
                        
                            | 
                                YMAR
                                YMAR
                                FT Vest International Equity Moderate Buffer ETF - March
                             | 
                            
                                March
                             | 
                            
                                EFA
                             | 
                            
                                MSCI EAFE Index
                             | 
                            
                                13.29%
                             | 
                            
                                -0.72%
                             | 
                            
                                -3.48%
                             | 
                            
                                0.43
                             | 
                            
                                9.67%
                             | 
                            
                                15.58%
                             | 
                            
                                -10.36%
                             | 
                            
                                -18.62%
                             | 
                            
                                03/22/21
                             | 
                            
                                03/18/22
                             | 
                        
                    
                        
                            | 
                                YMAR
                                YMAR
                                FT Vest International Equity Moderate Buffer ETF - March
                             | 
                            
                                March
                             | 
                            
                                EFA
                             | 
                            
                                MSCI EAFE Index
                             | 
                            
                                19.80%
                             | 
                            
                                -0.70%
                             | 
                            
                                -8.93%
                             | 
                            
                                0.53
                             | 
                            
                                14.39%
                             | 
                            
                                21.39%
                             | 
                            
                                -17.91%
                             | 
                            
                                -26.09%
                             | 
                            
                                03/21/22
                             | 
                            
                                03/17/23
                             | 
                        
                    
                        
                            | 
                                YMAR
                                YMAR
                                FT Vest International Equity Moderate Buffer ETF - March
                             | 
                            
                                March
                             | 
                            
                                EFA
                             | 
                            
                                MSCI EAFE Index
                             | 
                            
                                23.89%
                             | 
                            
                                16.69%
                             | 
                            
                                17.43%
                             | 
                            
                                0.67
                             | 
                            
                                11.68%
                             | 
                            
                                12.94%
                             | 
                            
                                -9.77%
                             | 
                            
                                -11.58%
                             | 
                            
                                03/20/23
                             | 
                            
                                03/15/24
                             | 
                        
                    
                        
                            | 
                                YMAR
                                YMAR
                                FT Vest International Equity Moderate Buffer ETF - March
                             | 
                            
                                March
                             | 
                            
                                EFA
                             | 
                            
                                MSCI EAFE Index
                             | 
                            
                                14.89%
                             | 
                            
                                5.24%
                             | 
                            
                                6.05%
                             | 
                            
                                0.48
                             | 
                            
                                9.31%
                             | 
                            
                                13.82%
                             | 
                            
                                -7.03%
                             | 
                            
                                -11.35%
                             | 
                            
                                03/18/24
                             | 
                            
                                03/21/25
                             | 
                        
                    
                        
                            | 
                                YSEP
                                YSEP
                                FT Vest International Equity Moderate Buffer ETF - September
                             | 
                            
                                September
                             | 
                            
                                EFA
                             | 
                            
                                MSCI EAFE Index
                             | 
                            
                                12.03%
                             | 
                            
                                -15.72%
                             | 
                            
                                -24.97%
                             | 
                            
                                0.56
                             | 
                            
                                14.48%
                             | 
                            
                                20.02%
                             | 
                            
                                -17.23%
                             | 
                            
                                -26.29%
                             | 
                            
                                09/20/21
                             | 
                            
                                09/16/22
                             | 
                        
                    
                        
                            | 
                                YSEP
                                YSEP
                                FT Vest International Equity Moderate Buffer ETF - September
                             | 
                            
                                September
                             | 
                            
                                EFA
                             | 
                            
                                MSCI EAFE Index
                             | 
                            
                                24.10%
                             | 
                            
                                17.44%
                             | 
                            
                                18.18%
                             | 
                            
                                0.60
                             | 
                            
                                12.50%
                             | 
                            
                                17.51%
                             | 
                            
                                -6.41%
                             | 
                            
                                -8.36%
                             | 
                            
                                09/19/22
                             | 
                            
                                09/15/23
                             | 
                        
                    
                        
                            | 
                                YSEP
                                YSEP
                                FT Vest International Equity Moderate Buffer ETF - September
                             | 
                            
                                September
                             | 
                            
                                EFA
                             | 
                            
                                MSCI EAFE Index
                             | 
                            
                                19.69%
                             | 
                            
                                14.48%
                             | 
                            
                                15.24%
                             | 
                            
                                0.61
                             | 
                            
                                12.50%
                             | 
                            
                                13.43%
                             | 
                            
                                -6.42%
                             | 
                            
                                -8.33%
                             | 
                            
                                09/18/23
                             | 
                            
                                09/20/24
                             | 
                        
                    
                        
                            | 
                                YSEP
                                YSEP
                                FT Vest International Equity Moderate Buffer ETF - September
                             | 
                            
                                September
                             | 
                            
                                EFA
                             | 
                            
                                MSCI EAFE Index
                             | 
                            
                                12.57%
                             | 
                            
                                12.26%
                             | 
                            
                                13.06%
                             | 
                            
                                0.31
                             | 
                            
                                11.34%
                             | 
                            
                                16.96%
                             | 
                            
                                -7.30%
                             | 
                            
                                -14.05%
                             | 
                            
                                09/23/24
                             | 
                            
                                09/19/25
                             |