First Trust Ultra Short Duration Municipal ETF Expense Example, No Redemption - First Trust Ultra Short Duration Municipal ETF - First Trust Ultra Short Duration Municipal ETF |
Jul. 31, 2025
USD ($)
|
|---|---|
| Prospectus [Line Items] | |
| Expense Example, No Redemption, 1 Year | $ 46 |
| Expense Example, No Redemption, 3 Years | 144 |
| Expense Example, No Redemption, 5 Years | 252 |
| Expense Example, No Redemption, 10 Years | $ 567 |