v3.25.3
First Trust Municipal High Income ETF Investment Objectives and Goals - First Trust Municipal High Income ETF
Jul. 31, 2025
Prospectus [Line Items]  
Risk/Return [Heading] <span style="font-family:Arial;font-size:12.60pt;font-weight:bold;">First Trust Municipal High Income ETF (FMHI)</span>
Objective [Heading] <span style="color:#000000;font-family:Arial;font-size:9.90pt;font-weight:bold;">Investment Objectives</span>
Objective, Primary [Text Block] The First Trust Municipal High Income ETF’s (the “Fund”) primary investment objective is to provide federally tax-exempt income, and its secondary objective is long-term capital appreciation.