Investment Objectives and Goals - FT Vest US Equity Enhance & Moderate Buffer ETF - May	Aug. 31, 2024
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 Enhance & Moderate Buffer ETF </span><span style="color:#000000;font-family:Arial;font-size:12.60pt;font-weight:bold;margin-left:3.5pt;">– May (XMAY)</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 Enhance & Moderate Buffer ETF – May (the “Fund”) is to seek to provide investors with returns (before fees and expenses) of approximately twice any positive price return of the SPDR® S&P 500® ETF Trust (the “Underlying ETF”), up to a predetermined upside cap of 10.38% while providing a buffer (before fees and expenses) against the first 15% of Underlying ETF losses, over the period from May 19, 2025 through May 15, 2026.