Investment Objectives and Goals - FT Vest U.S. Equity Quarterly Max Buffer ETF	Dec. 20, 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 Quarterly Max Buffer ETF (SQMX)</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 Max Buffer ETF (the “Fund”) is to seek to provide investors with returns (before fees and expenses) that match the price return of the SPDR® S&P 500® ETF Trust (the "Underlying ETF") up to a predetermined upside cap while seeking to provide the maximum available buffer (before fees and expenses), as described below, against Underlying ETF losses over an approximate period of three months (the "Target Outcome Period").