v3.25.3
First Trust California Municipal High Income ETF Expense Example, No Redemption - First Trust California Municipal High Income ETF - First Trust California Municipal High Income ETF
Jul. 31, 2025
USD ($)
Prospectus [Line Items]  
Expense Example, No Redemption, 1 Year $ 66
Expense Example, No Redemption, 3 Years 208
Expense Example, No Redemption, 5 Years 362
Expense Example, No Redemption, 10 Years $ 810