v3.26.1
S000000714 [Member] Expense Example, No Redemption - Western Asset Core Plus Bond Fund
Dec. 31, 2025
USD ($)
Class I  
Prospectus [Line Items]  
Expense Example, No Redemption, 1 Year $ 45
Expense Example, No Redemption, 3 Years 141
Expense Example, No Redemption, 5 Years 246
Expense Example, No Redemption, 10 Years 553
Class FI  
Prospectus [Line Items]  
Expense Example, No Redemption, 1 Year 83
Expense Example, No Redemption, 3 Years 259
Expense Example, No Redemption, 5 Years 450
Expense Example, No Redemption, 10 Years 1,003
Class IS  
Prospectus [Line Items]  
Expense Example, No Redemption, 1 Year 44
Expense Example, No Redemption, 3 Years 138
Expense Example, No Redemption, 5 Years 241
Expense Example, No Redemption, 10 Years 543
CLASS A  
Prospectus [Line Items]  
Expense Example, No Redemption, 1 Year 455
Expense Example, No Redemption, 3 Years 624
Expense Example, No Redemption, 5 Years 808
Expense Example, No Redemption, 10 Years 1,340
CLASS C  
Prospectus [Line Items]  
Expense Example, No Redemption, 1 Year 155
Expense Example, No Redemption, 3 Years 481
Expense Example, No Redemption, 5 Years 829
Expense Example, No Redemption, 10 Years 1,620
CLASS R  
Prospectus [Line Items]  
Expense Example, No Redemption, 1 Year 115
Expense Example, No Redemption, 3 Years 359
Expense Example, No Redemption, 5 Years 622
Expense Example, No Redemption, 10 Years 1,374
Class C1  
Prospectus [Line Items]  
Expense Example, No Redemption, 1 Year 154
Expense Example, No Redemption, 3 Years 3,403
Expense Example, No Redemption, 5 Years 5,866
Expense Example, No Redemption, 10 Years $ 8,554