Shareholder Report, Average Annual Return (Details) LMF5900_Western Asset Short Duration High Income Fund_Class C_TSR Annual {Class C} |
12 Months Ended | 60 Months Ended | 120 Months Ended |
|---|---|---|---|
Jul. 31, 2026 |
Jul. 31, 2026 |
Jul. 31, 2026 |
|
| Class C | |||
| Average Annual Return [Line Items] | |||
| Line Graph and Table Measure Name | Class C (with sales charge) | ||
| Average Annual Return, Percent | 3.53% | 3.76% | 4.53% |
| Without Sales Load [Member] | Class C | |||
| Average Annual Return [Line Items] | |||
| Line Graph and Table Measure Name | Class C | ||
| Average Annual Return, Percent | 4.51% | 3.76% | 4.53% |
| 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% |