FT Vest U.S. Equity Buffer & Premium Income ETF - December Investment Objectives and Goals - FT Vest U.S. Equity Buffer & Premium Income ETF - December	Aug. 31, 2025
Prospectus [Line Items]
Risk/Return [Heading]	<span style="font-family:Arial;font-size:12.60pt;font-weight:bold;">FT Vest U.S. Equity Buffer & Premium Income ETF </span><span style="font-family:Arial;font-size:12.60pt;font-weight:bold;margin-left:3.5pt;">– December (XIDE)</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 Buffer & Premium Income ETF – December (the “Fund”) is to seek to provide investors with a consistent level of income that, when annualized, is approximately 7.08% (before fees and expenses) while providing a buffer against the first 10% of Underlying ETF losses, over the period from December 22, 2025 through December 18, 2026.