Shareholder Report, Average Annual Return (Details) 1014020_Franklin Dynamic Municipal Bond ETF_Single Class_TSR Annual {Single Class} |
12 Months Ended | 60 Months Ended | 103 Months Ended |
|---|---|---|---|
Mar. 31, 2026 |
Mar. 31, 2026 |
Mar. 31, 2026 |
|
| Franklin Dynamic Municipal Bond ETF | |||
| Average Annual Return [Line Items] | |||
| Line Graph and Table Measure Name | Franklin Dynamic Municipal Bond ETF (NAV) | ||
| Average Annual Return, Percent | 5.63% | 2.21% | 2.88% |
| Bloomberg Municipal Bond Index [Member] | |||
| Average Annual Return [Line Items] | |||
| Line Graph and Table Measure Name | Bloomberg Municipal Bond Index | ||
| Average Annual Return, Percent | 4.29% | 0.84% | 2.08% |
| Bloomberg Municipal 1-15 Year Index [Member] | |||
| Average Annual Return [Line Items] | |||
| Line Graph and Table Measure Name | Bloomberg Municipal 1-15 Year Index | ||
| Average Annual Return, Percent | 4.49% | 1.17% | 2.07% |