v3.26.1
S000000715 [Member] Expense Example - Western Asset Inflation Indexed Plus Bond Fund
Dec. 31, 2025
USD ($)
Class FI  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year $ 87
Expense Example, with Redemption, 3 Years 356
Expense Example, with Redemption, 5 Years 645
Expense Example, with Redemption, 10 Years 1,467
Class I  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 90
Expense Example, with Redemption, 3 Years 281
Expense Example, with Redemption, 5 Years 488
Expense Example, with Redemption, 10 Years 1,084
Class IS  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 79
Expense Example, with Redemption, 3 Years 246
Expense Example, with Redemption, 5 Years 428
Expense Example, with Redemption, 10 Years 955
CLASS A  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 463
Expense Example, with Redemption, 3 Years 696
Expense Example, with Redemption, 5 Years 947
Expense Example, with Redemption, 10 Years 1,666
CLASS C  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 268
Expense Example, with Redemption, 3 Years 575
Expense Example, with Redemption, 5 Years 1,008
Expense Example, with Redemption, 10 Years 2,006
CLASS R  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 117
Expense Example, with Redemption, 3 Years 493
Expense Example, with Redemption, 5 Years 893
Expense Example, with Redemption, 10 Years 2,014
Class C1  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 143
Expense Example, with Redemption, 3 Years 3,320
Expense Example, with Redemption, 5 Years 5,756
Expense Example, with Redemption, 10 Years $ 8,484