Average Annual Total Returns |
12 Months Ended | 50 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% | 13.00% | |
| FT Vest U.S. Equity Buffer ETF - August | |||
| Prospectus [Line Items] | |||
| Average Annual Return, Percent | 16.76% | 7.44% | |
| Performance Inception Date | Nov. 06, 2019 | ||
| FT Vest U.S. Equity Buffer ETF - August | After Taxes on Distributions | |||
| Prospectus [Line Items] | |||
| Average Annual Return, Percent | 16.76% | 7.44% | |
| FT Vest U.S. Equity Buffer ETF - August | After Taxes on Distributions and Sales | |||
| Prospectus [Line Items] | |||
| Average Annual Return, Percent | 9.92% | 5.81% |