First Trust NYSE Arca Biotechnology Index Fund Expense Example, No Redemption - First Trust NYSE Arca Biotechnology Index Fund - First Trust NYSE Arca Biotechnology 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 |