v3.26.1
S000016637 [Member] Expense Example - Western Asset Pennsylvania Municipals Fund
Mar. 31, 2026
USD ($)
Class A  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year $ 463
Expense Example, with Redemption, 3 Years 651
Expense Example, with Redemption, 5 Years 855
Expense Example, with Redemption, 10 Years 1,442
Class C  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 250
Expense Example, with Redemption, 3 Years 465
Expense Example, with Redemption, 5 Years 803
Expense Example, with Redemption, 10 Years 1,603
Class FI  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 87
Expense Example, with Redemption, 3 Years 332
Expense Example, with Redemption, 5 Years 595
Expense Example, with Redemption, 10 Years 1,350
Class I  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 56
Expense Example, with Redemption, 3 Years 217
Expense Example, with Redemption, 5 Years 392
Expense Example, with Redemption, 10 Years 899
Class IS  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 53
Expense Example, with Redemption, 3 Years 202
Expense Example, with Redemption, 5 Years 363
Expense Example, with Redemption, 10 Years $ 833