Investment Objectives and Goals - FT Vest U.S. Equity Quarterly 2.5 to 15 Buffer ETF |
May 31, 2025 |
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| Prospectus [Line Items] | |
| Risk/Return [Heading] | <span style="color:#000000;font-family:Arial;font-size:12.60pt;font-weight:bold;">FT Vest U.S. Equity Quarterly 2.5 to 15 Buffer ETF (DHDG)</span> |
| Objective [Heading] | <span style="color:#000000;font-family:Arial;font-size:9.90pt;font-weight:bold;">Investment Objective</span> |
| Objective, Primary [Text Block] | The investment objective of the FT Vest U.S. Equity Quarterly 2.5 to 15 Buffer ETF (the “Fund”) is to seek to provide investors with returns (before fees and expenses) that match the price return of the State Street® SPDR® S&P 500® ETF Trust (the "Underlying ETF"), up to a predetermined upside cap of 4.30% while providing a buffer (before fees and expenses) against Underlying ETF losses between -2.5% and -15% over the period from July 20, 2026 through October 16, 2026. |