Investment Objectives and Goals - FT Vest Nasdaq-100 Conservative Buffer ETF - July	Aug. 31, 2025
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;"> Conservative Buffer ETF </span><span style="color:#000000;font-family:Arial;font-size:12.60pt;font-weight:bold;margin-left:3.5pt;">– July (QCJL)</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® Conservative Buffer ETF – July (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 16.40% while providing a buffer (before fees and expenses) against the first 20% of Underlying ETF losses, over the period from July 20, 2026 through July 16, 2027.