Shareholder Report, Average Annual Return (Details) 74200007100_Franklin Federal Limited-Term Tax-Free Income Fund_Class R6_TSR Annual {Class R6} |
12 Months Ended | 60 Months Ended | 120 Months Ended |
|---|---|---|---|
Feb. 28, 2026 |
Feb. 28, 2026 |
Feb. 28, 2026 |
|
| Class R6 | |||
| Average Annual Return [Line Items] | |||
| Line Graph and Table Measure Name | Class R6 | ||
| Average Annual Return, Percent | 4.58% | 2.09% | 1.83% |
| Bloomberg Municipal Bond Index [Member] | |||
| Average Annual Return [Line Items] | |||
| Line Graph and Table Measure Name | Bloomberg Municipal Bond Index | ||
| Average Annual Return, Percent | 4.96% | 1.44% | 2.43% |
| Bloomberg Municipal Short -5 Years Index [Member] | |||
| Average Annual Return [Line Items] | |||
| Line Graph and Table Measure Name | Bloomberg Municipal Short 1-5 Years Index | ||
| Average Annual Return, Percent | 4.35% | 1.67% | 1.71% |