Class C2 [Member] Performance Management - Class C2 - Western Asset Short Duration Municipal Income Fund |
Feb. 28, 2025 |
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| Prospectus [Line Items] | |
| Bar Chart and Performance Table [Heading] | Performance |
| Performance Narrative [Text Block] | The accompanying bar chart and table provide some indication of the risks of investing in the fund. The bar chart shows changes in the fund’s performance from year to year for Class C2 shares. The table shows the average annual total returns of Class C2 shares of the fund and also compares the fund’s performance with the average annual total returns of a broad measure of market performance and an additional index with characteristics relevant to the fund. Performance for classes other than those shown may vary from the performance shown to the extent the expenses for those classes differ. The fund makes updated performance information, including its current net asset value, available at www.franklintempleton.com/prospectus (select fund and share class), or by calling the fund at 877‑6LM‑FUND/656‑3863. The fund’s past performance (before and after taxes) is not necessarily an indication of how the fund will perform in the future. Sales charges are not reflected in the accompanying bar chart, and if those charges were included, returns would be less than those shown.
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| Performance Past Does Not Indicate Future [Text] | The fund’s past performance (before and after taxes) is not necessarily an indication of how the fund will perform in the future. |
| Performance Information Illustrates Variability of Returns [Text] | The bar chart shows changes in the fund’s performance from year to year for Class C2 shares. The table shows the average annual total returns of Class C2 shares of the fund and also compares the fund’s performance with the average annual total returns of a broad measure of market performance and an additional index with characteristics relevant to the fund. |
| Bar Chart Does Not Reflect Sales Loads [Text] | Sales charges are not reflected in the accompanying bar chart, and if those charges were included, returns would be less than those shown. |
| Bar Chart [Heading] | Total returns (%) Before taxes |
| Bar Chart Closing [Text Block] | Calendar Years ended December 31 Best Quarter (12/31/2023): 3.29 Worst Quarter (03/31/2022): (3.21) The year-to-date return as of the most recent calendar quarter, which ended 03/31/2025, was 0.88 |
| Performance Table Heading | Average annual total returns (%)(for periods ended December 31, 2024) |
| Performance Table Narrative | After‑tax returns are calculated using the historical highest individual U.S. federal marginal income tax rates and do not reflect the impact of state and local taxes. Actual after‑tax returns depend on an investor’s tax situation and may differ from those shown. After‑tax returns for classes other than Class C2 will vary from returns shown for Class C2. Returns after taxes on distributions and sale of fund shares are higher than returns before taxes for certain periods shown because they reflect the tax benefit of capital losses realized on the redemption of fund shares. Important data provider notices and terms are available at www.franklintempletondatasources.com. All data is subject to change.
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| Performance Table Uses Highest Federal Rate | After‑tax returns are calculated using the historical highest individual U.S. federal marginal income tax rates and do not reflect the impact of state and local taxes. |
| Performance Table Explanation after Tax Higher | Returns after taxes on distributions and sale of fund shares are higher than returns before taxes for certain periods shown because they reflect the tax benefit of capital losses realized on the redemption of fund shares. |
| Performance Table One Class of after Tax Shown [Text] | After‑tax returns are calculated using the historical highest individual U.S. federal marginal income tax rates and do not reflect the impact of state and local taxes. Actual after‑tax returns depend on an investor’s tax situation and may differ from those shown. After‑tax returns for classes other than Class C2 will vary from returns shown for Class C2. Returns after taxes on distributions and sale of fund shares are higher than returns before taxes for certain periods shown because they reflect the tax benefit of capital losses realized on the redemption of fund shares. |
| Performance Availability Website Address [Text] | www.franklintempleton.com/prospectus (select fund and share class) |
| Performance Availability Phone [Text] | 877‑6LM‑FUND/656‑3863 |
| Class C2 | |
| Prospectus [Line Items] | |
| Year to Date Return, Label [Optional Text] | year‑to‑date return |
| Bar Chart, Year to Date Return | 0.88% |
| Bar Chart, Year to Date Return, Date | Mar. 31, 2025 |
| Highest Quarterly Return, Label [Optional Text] | Best Quarter |
| Highest Quarterly Return | 3.29% |
| Highest Quarterly Return, Date | Dec. 31, 2023 |
| Lowest Quarterly Return, Label [Optional Text] | Worst Quarter |
| Lowest Quarterly Return | (3.21%) |
| Lowest Quarterly Return, Date | Mar. 31, 2022 |