v3.25.3
First Trust AAA CMBS ETF Annual Fund Operating Expenses - First Trust AAA CMBS ETF - First Trust AAA CMBS ETF
Jul. 31, 2025
Prospectus [Line Items]  
Management Fees (as a percentage of Assets) 0.45%
Distribution and Service (12b-1) Fees 0.00%
Other Expenses (as a percentage of Assets): 0.00%
Acquired Fund Fees and Expenses 0.01%
Expenses (as a percentage of Assets) 0.46%