Shareholder Report, Average Annual Return (Details) LMF5900_Western Asset Short Duration High Income Fund_Class R_TSR Annual {Class R} |
12 Months Ended | 60 Months Ended | 120 Months Ended |
|---|---|---|---|
Jul. 31, 2026 |
Jul. 31, 2026 |
Jul. 31, 2026 |
|
| Class R | |||
| Average Annual Return [Line Items] | |||
| Line Graph and Table Measure Name | Class R | ||
| Average Annual Return, Percent | 4.98% | 4.03% | 4.86% |
| Bloomberg U.S. Aggregate Index [Member] | |||
| Average Annual Return [Line Items] | |||
| Line Graph and Table Measure Name | Bloomberg U.S. Aggregate Index | ||
| Average Annual Return, Percent | 2.71% | (0.40%) | 1.35% |
| Bloomberg US High Yield 1-5 Year Cash Pay 2% Constrained Index [Member] | |||
| Average Annual Return [Line Items] | |||
| Line Graph and Table Measure Name | Bloomberg U.S. High Yield 1-5 Year Cash Pay 2% Constrained Index | ||
| Average Annual Return, Percent | 4.96% | 5.02% | 5.56% |