S000016626 [Member] Annual Fund Operating Expenses - Western Asset Intermediate-Term Municipals Fund |
Mar. 31, 2026 |
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| Prospectus [Line Items] | ||||||||
| Fee Waiver or Reimbursement over Assets, Date of Termination | December 31, 2027 | |||||||
| Class A | ||||||||
| Prospectus [Line Items] | ||||||||
| Management Fees (as a percentage of Assets) | 0.35% | |||||||
| Distribution and Service (12b-1) Fees | 0.15% | |||||||
| Component1 Other Expenses | 0.05% | |||||||
| Component2 Other Expenses | 0.11% | |||||||
| Other Expenses (as a percentage of Assets): | 0.16% | |||||||
| Expenses (as a percentage of Assets) | 0.66% | |||||||
| Fee Waiver or Reimbursement | [1] | |||||||
| Net Expenses (as a percentage of Assets) | 0.66% | |||||||
| Class C | ||||||||
| Prospectus [Line Items] | ||||||||
| Management Fees (as a percentage of Assets) | 0.35% | |||||||
| Distribution and Service (12b-1) Fees | 0.75% | |||||||
| Component1 Other Expenses | 0.05% | |||||||
| Component2 Other Expenses | 0.11% | |||||||
| Other Expenses (as a percentage of Assets): | 0.16% | |||||||
| Expenses (as a percentage of Assets) | 1.26% | |||||||
| Fee Waiver or Reimbursement | [1] | |||||||
| Net Expenses (as a percentage of Assets) | 1.26% | |||||||
| Class I | ||||||||
| Prospectus [Line Items] | ||||||||
| Management Fees (as a percentage of Assets) | 0.35% | |||||||
| Distribution and Service (12b-1) Fees | 0.00% | |||||||
| Component1 Other Expenses | 0.05% | |||||||
| Component2 Other Expenses | 0.15% | |||||||
| Other Expenses (as a percentage of Assets): | 0.20% | |||||||
| Expenses (as a percentage of Assets) | 0.55% | |||||||
| Fee Waiver or Reimbursement | (0.07%) | [1] | ||||||
| Net Expenses (as a percentage of Assets) | 0.48% | [2] | ||||||
| Class FI | ||||||||
| Prospectus [Line Items] | ||||||||
| Management Fees (as a percentage of Assets) | 0.35% | |||||||
| Distribution and Service (12b-1) Fees | 0.25% | |||||||
| Component1 Other Expenses | 0.05% | |||||||
| Component2 Other Expenses | 0.24% | [3] | ||||||
| Other Expenses (as a percentage of Assets): | 0.29% | |||||||
| Expenses (as a percentage of Assets) | 0.89% | |||||||
| Fee Waiver or Reimbursement | (0.04%) | [1] | ||||||
| Net Expenses (as a percentage of Assets) | 0.85% | [2] | ||||||
| Class IS | ||||||||
| Prospectus [Line Items] | ||||||||
| Management Fees (as a percentage of Assets) | 0.35% | |||||||
| Distribution and Service (12b-1) Fees | 0.00% | |||||||
| Component1 Other Expenses | 0.05% | |||||||
| Component2 Other Expenses | 0.04% | |||||||
| Other Expenses (as a percentage of Assets): | 0.09% | |||||||
| Expenses (as a percentage of Assets) | 0.44% | |||||||
| Fee Waiver or Reimbursement | [1] | |||||||
| Net Expenses (as a percentage of Assets) | 0.44% | [2] | ||||||
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