v3.26.1
First Trust NASDAQ-100-Technology Sector Index Fund Expense Example, No Redemption - First Trust NASDAQ-100-Technology Sector Index Fund - First Trust NASDAQ-100-Technology Sector Index Fund
Dec. 31, 2025
USD ($)
Prospectus [Line Items]  
Expense Example, No Redemption, 1 Year $ 56
Expense Example, No Redemption, 3 Years 176
Expense Example, No Redemption, 5 Years 307
Expense Example, No Redemption, 10 Years $ 689