Shareholder Report, Line Graph (Details) 9057873_Franklin Minnesota Municipal Income ETF_Single Class_TSR Annual {Single Class} - USD ($) |
12 Months Ended | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
May 31, 2025 |
May 31, 2024 |
May 31, 2023 |
May 31, 2022 |
May 31, 2021 |
May 31, 2020 |
May 31, 2019 |
May 31, 2018 |
May 31, 2017 |
May 31, 2016 |
May 31, 2026 |
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| Franklin Minnesota Municipal Income ETF | |||||||||||
| Account Value [Line Items] | |||||||||||
| Line Graph and Table Measure Name | Franklin Minnesota Municipal Income ETF (NAV) | ||||||||||
| Accumulated Value | $ 11,455 | $ 11,263 | $ 10,932 | $ 10,910 | $ 11,652 | $ 11,171 | $ 10,803 | $ 10,252 | $ 10,134 | $ 10,000 | $ 12,319 |
| Bloomberg Municipal Bond Index [Member] | |||||||||||
| Account Value [Line Items] | |||||||||||
| Line Graph and Table Measure Name | Bloomberg Municipal Bond Index | ||||||||||
| Accumulated Value | $ 11,664 | $ 11,432 | $ 11,134 | $ 11,080 | $ 11,888 | $ 11,350 | $ 10,916 | $ 10,259 | $ 10,146 | $ 10,000 | $ 12,442 |