v3.25.3
First Trust Multi Cap Value AlphaDEX Fund Expense Example, No Redemption - First Trust Multi Cap Value AlphaDEX Fund - First Trust Multi Cap Value AlphaDEX Fund
Jul. 31, 2025
USD ($)
Prospectus [Line Items]  
Expense Example, No Redemption, 1 Year $ 67
Expense Example, No Redemption, 3 Years 211
Expense Example, No Redemption, 5 Years 368
Expense Example, No Redemption, 10 Years $ 822