v3.26.1
FT Confluence BDC & Specialty Finance Income ETF Average Annual Total Returns
 12 Months Ended 60 Months Ended 120 Months Ended 171 Months Ended 223 Months Ended
Nov. 30, 2025
Dec. 31, 2025
Dec. 31, 2025
Dec. 31, 2025
Dec. 31, 2025
Dec. 31, 2025
MarketVector™ US Business Development Companies Liquid Index (reflects no deduction for fees, expenses or taxes)[Member]            
Prospectus [Line Items]            
Average Annual Return, Percent [1]   (3.51%) 11.91% 9.43%  
MSCI USA IMI Financials Index (reflects no deduction for fees, expenses or taxes)[Member]            
Prospectus [Line Items]            
Average Annual Return, Percent [1]   14.97% 15.26% 13.07%  
FBDC Blended Benchmark (reflects no deduction for fees, expenses or taxes)[Member]            
Prospectus [Line Items]            
Average Annual Return, Percent [2]   1.52% 9.97% 8.80%  
S&P 500® Index (reflects no deduction for fees, expenses or taxes)[Member]            
Prospectus [Line Items]            
Average Annual Return, Percent   17.88% 14.42% 14.82% 15.27% 10.56%
FT Confluence BDC & Specialty Finance Income ETF            
Prospectus [Line Items]            
Average Annual Return, Percent [3]   (2.45%) 11.68% 5.93%   1.77%
Performance Inception Date [3] May 25, 2007          
FT Confluence BDC & Specialty Finance Income ETF | After Taxes on Distributions            
Prospectus [Line Items]            
Average Annual Return, Percent   (6.28%) 7.54% 1.57%   (2.27%)
FT Confluence BDC & Specialty Finance Income ETF | After Taxes on Distributions and Sales            
Prospectus [Line Items]            
Average Annual Return, Percent   (1.41%) 7.19% 2.49%   (0.64%)
[1] Because the index has an inception date after the Fund's inception, performance data is not available for all the periods shown.
[2] The Blended Benchmark consists of a 70/20/10 blend of the MVIS U.S. Business Development Companies Index, the FTSE NARIET Mortgage REIT Index and the S&P SmallCap Financials Index. The Blended Benchmark returns are calculated by using the monthly return of the three indices during each period shown above. At the beginning of each month, the three indices are rebalanced, to account for divergence from that ratio that occurred during the course of each month to the ratios noted above. The monthly returns are then compounded for each period shown above, giving the performance for the Blended Benchmark for each period shown above. Since the MVIS U.S. Business Development Companies Index had an inception date of August 4, 2011, the performance of the Blended Benchmark is not available for all of the periods disclosed.
[3] 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.