v3.25.2
First Trust SMID Growth Strength ETF Expense Example, No Redemption - First Trust SMID Growth Strength ETF - First Trust SMID Growth Strength ETF
Mar. 31, 2025
USD ($)
Prospectus [Line Items]  
Expense Example, No Redemption, 1 Year $ 62
Expense Example, No Redemption, 3 Years 195
Expense Example, No Redemption, 5 Years 340
Expense Example, No Redemption, 10 Years $ 762