v3.25.2
Class A C F I I And Class I S [Member] Expense Example, No Redemption - Class A, C, FI, I and Class IS - Western Asset Short Duration Municipal Income Fund
Feb. 28, 2025
USD ($)
Class A  
Prospectus [Line Items]  
Expense Example, No Redemption, 1 Year $ 280
Expense Example, No Redemption, 3 Years 408
Expense Example, No Redemption, 5 Years 547
Expense Example, No Redemption, 10 Years 953
Class C  
Prospectus [Line Items]  
Expense Example, No Redemption, 1 Year 97
Expense Example, No Redemption, 3 Years 303
Expense Example, No Redemption, 5 Years 526
Expense Example, No Redemption, 10 Years 1,067
Class FI  
Prospectus [Line Items]  
Expense Example, No Redemption, 1 Year 77
Expense Example, No Redemption, 3 Years 257
Expense Example, No Redemption, 5 Years 453
Expense Example, No Redemption, 10 Years 1,018
Class I  
Prospectus [Line Items]  
Expense Example, No Redemption, 1 Year 41
Expense Example, No Redemption, 3 Years 144
Expense Example, No Redemption, 5 Years 256
Expense Example, No Redemption, 10 Years 586
Class IS  
Prospectus [Line Items]  
Expense Example, No Redemption, 1 Year 36
Expense Example, No Redemption, 3 Years 122
Expense Example, No Redemption, 5 Years 216
Expense Example, No Redemption, 10 Years $ 490