v3.26.1
Shareholder Report, Line Graph (Details) 1014019_Franklin U.S. Large Cap Multifactor Index ETF_Single Class_TSR Annual {Single Class} - USD ($)
12 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Mar. 31, 2023
Mar. 31, 2022
Mar. 31, 2021
Mar. 31, 2020
Mar. 31, 2019
Mar. 31, 2018
Apr. 26, 2017
Mar. 31, 2026
Franklin U.S. Large Cap Multifactor Index ETF                    
Account Value [Line Items]                    
Line Graph and Table Measure Name                   Franklin U.S. Large Cap Multifactor Index ETF (NAV)
Accumulated Value $ 25,558 $ 23,831 $ 18,237 $ 19,357 $ 16,952 $ 11,437 $ 12,747 $ 11,384 $ 10,000 $ 30,995
Russell 3000 Index [Member]                    
Account Value [Line Items]                    
Line Graph and Table Measure Name                   Russell 3000 Index
Accumulated Value 25,662 23,934 18,512 20,249 18,092 11,131 12,249 11,262 10,000 $ 30,303
Russell 1000 Index [Member]                    
Account Value [Line Items]                    
Line Graph and Table Measure Name                   Russell 1000 Index
Accumulated Value 26,455 24,536 18,893 20,624 18,208 11,338 12,328 11,279 10,000 $ 31,149
LibertyQ U.S. Large Cap Equity Index [Member]                    
Account Value [Line Items]                    
Line Graph and Table Measure Name                   LibertyQ U.S. Large Cap Equity Index
Accumulated Value $ 26,002 $ 24,208 $ 18,500 $ 19,612 $ 17,155 $ 11,558 $ 12,859 $ 11,454 $ 10,000 $ 31,589