First Trust Merger Arbitrage ETF Expense Example, No Redemption - First Trust Merger Arbitrage ETF - First Trust Merger Arbitrage ETF |
Jul. 31, 2025
USD ($)
|
|---|---|
| Prospectus [Line Items] | |
| Expense Example, No Redemption, 1 Year | $ 172 |
| Expense Example, No Redemption, 3 Years | 533 |
| Expense Example, No Redemption, 5 Years | 918 |
| Expense Example, No Redemption, 10 Years | $ 1,998 |