v3.25.2
Average Annual Total Returns
 12 Months Ended 60 Months Ended 120 Months Ended 149 Months Ended
Jun. 20, 2025
Nov. 30, 2024
Nov. 30, 2024
Nov. 30, 2024
May 25, 2027
S&P 500® Index (reflects no deduction for fees, expenses or taxes)[Member]          
Prospectus [Line Items]          
Average Annual Return, Percent  
S&P BDC Index (reflects no deduction for fees, expenses or taxes)[Member]          
Prospectus [Line Items]          
Average Annual Return, Percent  
FT Confluence BDC & Specialty Finance Income ETF          
Prospectus [Line Items]          
Average Annual Return, Percent [1]  
Performance Inception Date [1] May 25, 2007        
FT Confluence BDC & Specialty Finance Income ETF | After Taxes on Distributions          
Prospectus [Line Items]          
Average Annual Return, Percent  
FT Confluence BDC & Specialty Finance Income ETF | After Taxes on Distributions and Sales          
Prospectus [Line Items]          
Average Annual Return, Percent  
[1] [Total return is based on the combination of reinvested dividend, capital gain, and return of capital distributions, if any, at prices obtained by the Predecessor Fund’s Dividend Reinvestment Plan and changes in NAV per share for NAV returns and changes in Common Share Price for market value returns. Total returns do not reflect sales load and are not annualized for periods of less than one year. Past performance is not indicative of future results.]