Shareholder Report, Line Graph (Details) LMF5100_Western Asset Municipal High Income Fund_Class A_TSR Annual {Class A} - 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 A | |||||||||||
| Account Value [Line Items] | |||||||||||
| Line Graph and Table Measure Name | Class A (with sales charge) | ||||||||||
| Accumulated Value | $ 11,157 | $ 11,374 | $ 10,657 | $ 10,612 | $ 11,529 | $ 10,677 | $ 10,435 | $ 9,837 | $ 9,614 | $ 9,575 | $ 11,948 |
| Bloomberg Municipal Bond Index [Member] | |||||||||||
| Account Value [Line Items] | |||||||||||
| Line Graph and Table Measure Name | Bloomberg Municipal Bond Index | ||||||||||
| Accumulated Value | $ 11,522 | $ 11,523 | $ 11,107 | $ 11,005 | $ 11,824 | $ 11,447 | $ 10,865 | $ 10,125 | $ 10,026 | $ 10,000 | $ 12,129 |