Shareholder Report, Line Graph (Details) 1014018_Franklin U.S. Mid 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. Mid Cap Multifactor Index ETF | ||||||||||
| Account Value [Line Items] | ||||||||||
| Line Graph and Table Measure Name | Franklin U.S. Mid Cap Multifactor Index ETF (NAV) | |||||||||
| Accumulated Value | $ 23,072 | $ 22,978 | $ 18,376 | $ 18,784 | $ 16,894 | $ 10,196 | $ 12,211 | $ 11,009 | $ 10,000 | $ 24,300 |
| 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 Midcap Index [Member] | ||||||||||
| Account Value [Line Items] | ||||||||||
| Line Graph and Table Measure Name | Russell Midcap Index | |||||||||
| Accumulated Value | 20,586 | 20,065 | 16,400 | 17,979 | 16,816 | 9,684 | 11,854 | 11,134 | 10,000 | $ 23,875 |
| LibertyQ U.S. Mid Cap Equity Index [Member] | ||||||||||
| Account Value [Line Items] | ||||||||||
| Line Graph and Table Measure Name | LibertyQ U.S. Mid Cap Equity Index | |||||||||
| Accumulated Value | $ 23,716 | $ 23,554 | $ 18,777 | $ 19,148 | $ 17,176 | $ 10,334 | $ 12,348 | $ 11,099 | $ 10,000 | $ 25,055 |