Shareholder Report, Average Annual Return (Details) 9057872_Franklin Massachusetts Municipal Income ETF_Single Class_TSR Annual {Single Class} |
12 Months Ended | 60 Months Ended | 120 Months Ended |
|---|---|---|---|
May 31, 2026 |
May 31, 2026 |
May 31, 2026 |
|
| Franklin Massachusetts Municipal Income ETF | |||
| Average Annual Return [Line Items] | |||
| Line Graph and Table Measure Name | Franklin Massachusetts Municipal Income ETF (NAV) | ||
| Average Annual Return, Percent | 7.03% | 0.71% | 2.00% |
| Bloomberg Municipal Bond Index [Member] | |||
| Average Annual Return [Line Items] | |||
| Line Graph and Table Measure Name | Bloomberg Municipal Bond Index | ||
| Average Annual Return, Percent | 6.67% | 0.92% | 2.21% |