Average Annual Total Returns |
12 Months Ended | 45 Months Ended | |
|---|---|---|---|
Aug. 31, 2025 |
Dec. 31, 2024 |
Dec. 31, 2024 |
|
| Nasdaq-100 Index® (reflects no deduction for fees, expenses or taxes)[Member] | |||
| Prospectus [Line Items] | |||
| Average Annual Return, Percent | 25.88% | 14.75% | |
| S&P 500® Index (reflects no deduction for fees, expenses or taxes)[Member] | |||
| Prospectus [Line Items] | |||
| Average Annual Return, Percent | 25.02% | 13.06% | |
| FT Vest Nasdaq-100 Buffer ETF - March | |||
| Prospectus [Line Items] | |||
| Average Annual Return, Percent | 16.54% | 11.06% | |
| Performance Inception Date | Mar. 19, 2021 | ||
| FT Vest Nasdaq-100 Buffer ETF - March | After Taxes on Distributions | |||
| Prospectus [Line Items] | |||
| Average Annual Return, Percent | 16.54% | 11.06% | |
| FT Vest Nasdaq-100 Buffer ETF - March | After Taxes on Distributions and Sales | |||
| Prospectus [Line Items] | |||
| Average Annual Return, Percent | 9.79% | 8.70% |