Shareholder Report, Line Graph (Details) 74200007100_Franklin Federal Limited-Term Tax-Free Income Fund_Advisor Class_TSR Annual {Advisor Class} - USD ($) |
12 Months Ended | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
Feb. 28, 2025 |
Feb. 29, 2024 |
Feb. 28, 2023 |
Feb. 28, 2022 |
Feb. 28, 2021 |
Feb. 29, 2020 |
Feb. 28, 2019 |
Feb. 28, 2018 |
Feb. 28, 2017 |
Feb. 29, 2016 |
Feb. 28, 2026 |
|
| Advisor Class | |||||||||||
| Account Value [Line Items] | |||||||||||
| Line Graph and Table Measure Name | Advisor Class | ||||||||||
| Accumulated Value | $ 11,444 | $ 10,965 | $ 10,508 | $ 10,680 | $ 10,793 | $ 10,686 | $ 10,261 | $ 10,044 | $ 10,028 | $ 10,000 | $ 11,953 |
| Bloomberg Municipal Bond Index [Member] | |||||||||||
| Account Value [Line Items] | |||||||||||
| Line Graph and Table Measure Name | Bloomberg Municipal Bond Index | ||||||||||
| Accumulated Value | 12,112 | 11,764 | 11,159 | 11,759 | 11,837 | 11,713 | 10,700 | 10,276 | 10,025 | 10,000 | $ 12,713 |
| Bloomberg Municipal Short -5 Years Index [Member] | |||||||||||
| Account Value [Line Items] | |||||||||||
| Line Graph and Table Measure Name | Bloomberg Municipal Short 1-5 Years Index | ||||||||||
| Accumulated Value | $ 11,355 | $ 10,991 | $ 10,606 | $ 10,769 | $ 10,908 | $ 10,735 | $ 10,342 | $ 10,090 | $ 10,034 | $ 10,000 | $ 11,849 |