Shareholder Report, Line Graph (Details) 1014017_Franklin U.S. Small 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. Small Cap Multifactor Index ETF | ||||||||||
| Account Value [Line Items] | ||||||||||
| Line Graph and Table Measure Name | Franklin U.S. Small Cap Multifactor Index ETF (NAV) | |||||||||
| Accumulated Value | $ 17,265 | $ 17,532 | $ 14,539 | $ 15,178 | $ 15,175 | $ 8,396 | $ 11,170 | $ 10,634 | $ 10,000 | $ 19,015 |
| 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 2000 Index [Member] | ||||||||||
| Account Value [Line Items] | ||||||||||
| Line Graph and Table Measure Name | Russell 2000 Index | |||||||||
| Accumulated Value | 15,994 | 16,662 | 13,919 | 15,746 | 16,713 | 8,578 | 11,285 | 11,058 | 10,000 | $ 20,109 |
| LibertyQ U.S. Small Cap Equity Index [Member] | ||||||||||
| Account Value [Line Items] | ||||||||||
| Line Graph and Table Measure Name | LibertyQ U.S. Small Cap Equity Index | |||||||||
| Accumulated Value | $ 17,898 | $ 18,110 | $ 14,961 | $ 15,579 | $ 15,533 | $ 8,561 | $ 11,361 | $ 10,788 | $ 10,000 | $ 19,781 |