Shareholder Report, Line Graph (Details) LMF5900_Western Asset Short Duration High Income Fund_Class R_TSR Annual {Class R} - 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 R | |||||||||||
| Account Value [Line Items] | |||||||||||
| Line Graph and Table Measure Name | Class R | ||||||||||
| Accumulated Value | $ 15,313 | $ 14,258 | $ 13,160 | $ 12,380 | $ 13,192 | $ 11,800 | $ 11,871 | $ 11,446 | $ 11,021 | $ 10,000 | $ 16,076 |
| Bloomberg U.S. Aggregate Index [Member] | |||||||||||
| Account Value [Line Items] | |||||||||||
| Line Graph and Table Measure Name | Bloomberg U.S. Aggregate Index | ||||||||||
| Accumulated Value | 11,130 | 10,766 | 10,243 | 10,600 | 11,664 | 11,746 | 10,666 | 9,869 | 9,949 | 10,000 | $ 11,431 |
| Bloomberg US High Yield 1-5 Year Cash Pay 2% Constrained Index [Member] | |||||||||||
| Account Value [Line Items] | |||||||||||
| Line Graph and Table Measure Name | Bloomberg U.S. High Yield 1-5 Year Cash Pay 2% Constrained Index | ||||||||||
| Accumulated Value | $ 16,362 | $ 15,053 | $ 13,634 | $ 12,866 | $ 13,447 | $ 12,039 | $ 12,041 | $ 11,508 | $ 11,041 | $ 10,000 | $ 17,174 |