Average Annual Total Returns |
12 Months Ended | 19 Months Ended | |
|---|---|---|---|
Aug. 31, 2025 |
Dec. 31, 2024 |
Dec. 31, 2024 |
|
| Russell 2000® Index (reflects no deduction for fees, expenses or taxes)[Member] | |||
| Prospectus [Line Items] | |||
| Average Annual Return, Percent | 11.54% | 16.91% | |
| Russell 3000® Index (reflects no deduction for fees, expenses or taxes)[Member] | |||
| Prospectus [Line Items] | |||
| Average Annual Return, Percent | 23.81% | 24.72% | |
| FT Vest U.S. Small Cap Moderate Buffer ETF - May | |||
| Prospectus [Line Items] | |||
| Average Annual Return, Percent | 12.61% | 13.98% | |
| Performance Inception Date | May 19, 2023 | ||
| FT Vest U.S. Small Cap Moderate Buffer ETF - May | After Taxes on Distributions | |||
| Prospectus [Line Items] | |||
| Average Annual Return, Percent | 12.61% | 13.98% | |
| FT Vest U.S. Small Cap Moderate Buffer ETF - May | After Taxes on Distributions and Sales | |||
| Prospectus [Line Items] | |||
| Average Annual Return, Percent | 7.47% | 10.76% |