v3.26.1
Annual Total Returns
12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
FT Vest International Equity Moderate Buffer ETF - June | FT Vest International Equity Moderate Buffer ETF - June      
Prospectus [Line Items]      
Annual Return [Percent] 1.46% 15.04% (8.47%)