S000000711 [Member] Annual Fund Operating Expenses - Western Asset Intermediate Bond Fund |
May 31, 2026 |
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| Prospectus [Line Items] | ||||||
| Fee Waiver or Reimbursement over Assets, Date of Termination | December 31, 2027 | |||||
| Class I | ||||||
| Prospectus [Line Items] | ||||||
| Management Fees (as a percentage of Assets) | 0.40% | |||||
| Distribution and Service (12b-1) Fees | 0.00% | |||||
| Other Expenses (as a percentage of Assets): | 0.25% | |||||
| Acquired Fund Fees and Expenses | 0.01% | |||||
| Expenses (as a percentage of Assets) | 0.66% | [1] | ||||
| Fee Waiver or Reimbursement | [2] | |||||
| Net Expenses (as a percentage of Assets) | 0.66% | |||||
| Class IS | ||||||
| Prospectus [Line Items] | ||||||
| Management Fees (as a percentage of Assets) | 0.40% | |||||
| Distribution and Service (12b-1) Fees | 0.00% | |||||
| Other Expenses (as a percentage of Assets): | 0.15% | |||||
| Acquired Fund Fees and Expenses | 0.01% | |||||
| Expenses (as a percentage of Assets) | 0.56% | [1] | ||||
| Fee Waiver or Reimbursement | (0.10%) | [2] | ||||
| Net Expenses (as a percentage of Assets) | 0.46% | |||||
| Class A | ||||||
| Prospectus [Line Items] | ||||||
| Management Fees (as a percentage of Assets) | 0.40% | |||||
| Distribution and Service (12b-1) Fees | 0.25% | |||||
| Other Expenses (as a percentage of Assets): | 0.21% | |||||
| Acquired Fund Fees and Expenses | 0.01% | |||||
| Expenses (as a percentage of Assets) | 0.87% | [1] | ||||
| Fee Waiver or Reimbursement | [2] | |||||
| Net Expenses (as a percentage of Assets) | 0.87% | |||||
| Class C | ||||||
| Prospectus [Line Items] | ||||||
| Management Fees (as a percentage of Assets) | 0.40% | |||||
| Distribution and Service (12b-1) Fees | 1.00% | |||||
| Other Expenses (as a percentage of Assets): | 0.23% | |||||
| Acquired Fund Fees and Expenses | 0.01% | |||||
| Expenses (as a percentage of Assets) | 1.64% | [1] | ||||
| Fee Waiver or Reimbursement | [2] | |||||
| Net Expenses (as a percentage of Assets) | 1.64% | |||||
| Class R | ||||||
| Prospectus [Line Items] | ||||||
| Management Fees (as a percentage of Assets) | 0.40% | |||||
| Distribution and Service (12b-1) Fees | 0.50% | |||||
| Other Expenses (as a percentage of Assets): | 0.35% | |||||
| Acquired Fund Fees and Expenses | 0.01% | |||||
| Expenses (as a percentage of Assets) | 1.26% | [1] | ||||
| Fee Waiver or Reimbursement | (0.10%) | [2] | ||||
| Net Expenses (as a percentage of Assets) | 1.16% | |||||
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