v3.26.1
S000000713 [Member] Expense Example - Western Asset Core Bond Fund
Dec. 31, 2025
USD ($)
Class R  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year $ 116
Expense Example, with Redemption, 3 Years 362
Expense Example, with Redemption, 5 Years 627
Expense Example, with Redemption, 10 Years 1,384
Class I  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 44
Expense Example, with Redemption, 3 Years 138
Expense Example, with Redemption, 5 Years 241
Expense Example, with Redemption, 10 Years 543
Class IS  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 43
Expense Example, with Redemption, 3 Years 139
Expense Example, with Redemption, 5 Years 244
Expense Example, with Redemption, 10 Years 552
Class A  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 456
Expense Example, with Redemption, 3 Years 627
Expense Example, with Redemption, 5 Years 813
Expense Example, with Redemption, 10 Years 1,350
Class C  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 257
Expense Example, with Redemption, 3 Years 487
Expense Example, with Redemption, 5 Years 839
Expense Example, with Redemption, 10 Years 1,640
Class C1  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 245
Expense Example, with Redemption, 3 Years 754
Expense Example, with Redemption, 5 Years 1,389
Expense Example, with Redemption, 10 Years 2,599
Class FI  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 82
Expense Example, with Redemption, 3 Years 256
Expense Example, with Redemption, 5 Years 444
Expense Example, with Redemption, 10 Years $ 990