Shareholder Report, Average Annual Return (Details) 1014017_Franklin U.S. Small Cap Multifactor Index ETF_Single Class_TSR Annual {Single Class} |
12 Months Ended | 60 Months Ended | 107 Months Ended |
|---|---|---|---|
Mar. 31, 2026 |
Mar. 31, 2026 |
Mar. 31, 2026 |
|
| Franklin U.S. Small Cap Multifactor Index ETF | |||
| Average Annual Return [Line Items] | |||
| Line Graph and Table Measure Name | Franklin U.S. Small Cap Multifactor Index ETF (NAV) | ||
| Average Annual Return, Percent | 10.14% | 4.62% | 7.46% |
| Russell 3000 Index [Member] | |||
| Average Annual Return [Line Items] | |||
| Line Graph and Table Measure Name | Russell 3000 Index | ||
| Average Annual Return, Percent | 18.09% | 10.87% | 13.19% |
| Russell 2000 Index [Member] | |||
| Average Annual Return [Line Items] | |||
| Line Graph and Table Measure Name | Russell 2000 Index | ||
| Average Annual Return, Percent | 25.72% | 3.77% | 7.98% |
| LibertyQ U.S. Small Cap Equity Index [Member] | |||
| Average Annual Return [Line Items] | |||
| Line Graph and Table Measure Name | LibertyQ U.S. Small Cap Equity Index | ||
| Average Annual Return, Percent | 10.52% | 4.95% | 7.81% |