Shareholder Report, Average Annual Return (Details) 74200006200_Franklin Federal Intermediate-Term Tax-Free Income Fund_Class A1_TSR Annual {Class A1} |
12 Months Ended | 60 Months Ended | 120 Months Ended |
|---|---|---|---|
Feb. 28, 2026 |
Feb. 28, 2026 |
Feb. 28, 2026 |
|
| Class A1 | |||
| Average Annual Return [Line Items] | |||
| Line Graph and Table Measure Name | Class A1 (with sales charge) | ||
| Average Annual Return, Percent | 3.17% | 1.20% | 1.63% |
| Without Sales Load [Member] | Class A1 | |||
| Average Annual Return [Line Items] | |||
| Line Graph and Table Measure Name | Class A1 | ||
| Average Annual Return, Percent | 5.53% | 1.66% | 1.86% |
| 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 -5 Year Index [Member] | |||
| Average Annual Return [Line Items] | |||
| Line Graph and Table Measure Name | Bloomberg Municipal 1-15 Year Index | ||
| Average Annual Return, Percent | 5.61% | 1.74% | 2.34% |