Shareholder Report, Line Graph (Details) LMF5100_Western Asset Municipal High Income Fund_Class I_TSR Annual {Class I} - USD ($) |
12 Months Ended | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
Jul. 31, 2025 |
Jul. 31, 2024 |
Jul. 31, 2023 |
Jul. 31, 2022 |
Jul. 31, 2021 |
Jul. 31, 2020 |
Jul. 31, 2019 |
Jul. 31, 2018 |
Jul. 31, 2017 |
Jul. 31, 2016 |
Jul. 31, 2026 |
|
| Class I | |||||||||||
| Account Value [Line Items] | |||||||||||
| Line Graph and Table Measure Name | Class I | ||||||||||
| Accumulated Value | $ 1,182,718 | $ 1,203,674 | $ 1,126,418 | $ 1,118,961 | $ 1,213,459 | $ 1,121,653 | $ 1,094,373 | $ 1,030,391 | $ 1,005,448 | $ 1,000,000 | $ 1,270,524 |
| Bloomberg Municipal Bond Index [Member] | |||||||||||
| Account Value [Line Items] | |||||||||||
| Line Graph and Table Measure Name | Bloomberg Municipal Bond Index | ||||||||||
| Accumulated Value | $ 1,152,226 | $ 1,152,257 | $ 1,110,684 | $ 1,100,466 | $ 1,182,379 | $ 1,144,719 | $ 1,086,501 | $ 1,012,527 | $ 1,002,565 | $ 1,000,000 | $ 1,212,892 |