v3.26.1
S000016626 [Member] Expense Example - Western Asset Intermediate-Term Municipals Fund
Mar. 31, 2026
USD ($)
Class A  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year $ 291
Expense Example, with Redemption, 3 Years 432
Expense Example, with Redemption, 5 Years 585
Expense Example, with Redemption, 10 Years 1,031
Class C  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 128
Expense Example, with Redemption, 3 Years 399
Expense Example, with Redemption, 5 Years 691
Expense Example, with Redemption, 10 Years 1,355
Class I  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 49
Expense Example, with Redemption, 3 Years 169
Expense Example, with Redemption, 5 Years 300
Expense Example, with Redemption, 10 Years 682
Class FI  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 87
Expense Example, with Redemption, 3 Years 280
Expense Example, with Redemption, 5 Years 490
Expense Example, with Redemption, 10 Years 1,093
Class IS  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 45
Expense Example, with Redemption, 3 Years 141
Expense Example, with Redemption, 5 Years 246
Expense Example, with Redemption, 10 Years $ 553