Average Annual Total Returns |
12 Months Ended | 42 Months Ended | |
|---|---|---|---|
Aug. 31, 2024 |
Dec. 31, 2023 |
Dec. 31, 2023 |
|
| S&P 500® Index (reflects no deduction for fees, expenses or taxes)[Member] | |||
| Prospectus [Line Items] | |||
| Average Annual Return, Percent | 26.29% | 14.78% | |
| FT Vest U.S. Equity Buffer ETF - June | |||
| Prospectus [Line Items] | |||
| Average Annual Return, Percent | 22.11% | 11.28% | |
| Performance Inception Date | Jun. 19, 2020 | ||
| FT Vest U.S. Equity Buffer ETF - June | After Taxes on Distributions | |||
| Prospectus [Line Items] | |||
| Average Annual Return, Percent | 22.11% | 11.28% | |
| FT Vest U.S. Equity Buffer ETF - June | After Taxes on Distributions and Sales | |||
| Prospectus [Line Items] | |||
| Average Annual Return, Percent | 13.09% | 8.85% |