Average Annual Total Returns |
12 Months Ended | 56 Months Ended | |
|---|---|---|---|
Aug. 31, 2025 |
Dec. 31, 2024 |
Dec. 31, 2024 |
|
| S&P 500® Index (reflects no deduction for fees, expenses or taxes)[Member] | |||
| Prospectus [Line Items] | |||
| Average Annual Return, Percent | 25.02% | 18.64% | |
| FT Vest U.S. Equity Deep Buffer ETF - May | |||
| Prospectus [Line Items] | |||
| Average Annual Return, Percent | 12.99% | 6.60% | |
| Performance Inception Date | May 15, 2020 | ||
| FT Vest U.S. Equity Deep Buffer ETF - May | After Taxes on Distributions | |||
| Prospectus [Line Items] | |||
| Average Annual Return, Percent | 12.99% | 6.60% | |
| FT Vest U.S. Equity Deep Buffer ETF - May | After Taxes on Distributions and Sales | |||
| Prospectus [Line Items] | |||
| Average Annual Return, Percent | 7.69% | 5.16% |