First Trust AAA CMBS ETF Expense Example, No Redemption - First Trust AAA CMBS ETF - First Trust AAA CMBS ETF |
Jul. 31, 2025
USD ($)
|
|---|---|
| Prospectus [Line Items] | |
| Expense Example, No Redemption, 1 Year | $ 47 |
| Expense Example, No Redemption, 3 Years | 148 |
| Expense Example, No Redemption, 5 Years | 258 |
| Expense Example, No Redemption, 10 Years | $ 579 |