Investment Objectives and Goals - FT Vest Nasdaq-100 Quarterly 15 Buffer ETF |
Sep. 11, 2026 |
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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 Nasdaq-100</span><span style="color:#000000;font-family:Arial;font-size:7.38pt;font-weight:bold;position:relative;top:-4.25pt;">®</span><span style="color:#000000;font-family:Arial;font-size:12.60pt;font-weight:bold;"> Quarterly 15 Buffer ETF (QQBF)</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 Nasdaq-100® Quarterly 15 Buffer ETF (the “Fund”) is to seek to provide investors with returns (before fees and expenses) that match the price return of the Invesco QQQ TrustSM, Series 1 (the "Underlying ETF"), up to a predetermined upside cap of ___% while providing a buffer (before fees and expenses) against the first 15% of Underlying ETF losses over the period from September 21, 2026 through December 18, 2026. |