Investment Objectives and Goals - FT Vest U.S. Equity Quarterly Dynamic 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 Dynamic Buffer ETF (FHDG)</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 Dynamic 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 while seeking to provide a dynamic buffer of either 5.0% or 7.5% (before fees and expenses) against Underlying ETF losses over an approximate period of three months (the "Target Outcome Period"). |