S000000714 [Member] Annual Fund Operating Expenses - Western Asset Core Plus Bond Fund |
Dec. 31, 2025 |
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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) | 0.41% | |||||
| Distribution and Service (12b-1) Fees | 0.00% | |||||
| Other Expenses (as a percentage of Assets): | 0.03% | [1] | ||||
| Expenses (as a percentage of Assets) | 0.44% | |||||
| Fee Waiver or Reimbursement | [2] | |||||
| Net Expenses (as a percentage of Assets) | 0.44% | |||||
| Class FI | ||||||
| Prospectus [Line Items] | ||||||
| Management Fees (as a percentage of Assets) | 0.41% | |||||
| Distribution and Service (12b-1) Fees | 0.25% | |||||
| Other Expenses (as a percentage of Assets): | 0.15% | |||||
| Expenses (as a percentage of Assets) | 0.81% | |||||
| Fee Waiver or Reimbursement | [2] | |||||
| Net Expenses (as a percentage of Assets) | 0.81% | |||||
| Class IS | ||||||
| Prospectus [Line Items] | ||||||
| Management Fees (as a percentage of Assets) | 0.41% | |||||
| Distribution and Service (12b-1) Fees | 0.00% | |||||
| Other Expenses (as a percentage of Assets): | 0.02% | |||||
| Expenses (as a percentage of Assets) | 0.43% | |||||
| Fee Waiver or Reimbursement | [2] | |||||
| Net Expenses (as a percentage of Assets) | 0.43% | |||||
| CLASS A | ||||||
| Prospectus [Line Items] | ||||||
| Management Fees (as a percentage of Assets) | 0.41% | |||||
| Distribution and Service (12b-1) Fees | 0.25% | |||||
| Other Expenses (as a percentage of Assets): | 0.15% | [1] | ||||
| Expenses (as a percentage of Assets) | 0.81% | |||||
| Fee Waiver or Reimbursement | [2] | |||||
| Net Expenses (as a percentage of Assets) | 0.81% | |||||
| CLASS C | ||||||
| Prospectus [Line Items] | ||||||
| Management Fees (as a percentage of Assets) | 0.41% | |||||
| Distribution and Service (12b-1) Fees | 1.00% | |||||
| Other Expenses (as a percentage of Assets): | 0.11% | |||||
| Expenses (as a percentage of Assets) | 1.52% | |||||
| Fee Waiver or Reimbursement | [2] | |||||
| Net Expenses (as a percentage of Assets) | 1.52% | |||||
| CLASS R | ||||||
| Prospectus [Line Items] | ||||||
| Management Fees (as a percentage of Assets) | 0.41% | |||||
| Distribution and Service (12b-1) Fees | 0.50% | |||||
| Other Expenses (as a percentage of Assets): | 0.22% | |||||
| Expenses (as a percentage of Assets) | 1.13% | |||||
| Fee Waiver or Reimbursement | [2] | |||||
| Net Expenses (as a percentage of Assets) | 1.13% | |||||
| Class C1 | ||||||
| Prospectus [Line Items] | ||||||
| Management Fees (as a percentage of Assets) | 0.41% | |||||
| Distribution and Service (12b-1) Fees | 0.70% | |||||
| Other Expenses (as a percentage of Assets): | 16.84% | |||||
| Expenses (as a percentage of Assets) | 17.95% | |||||
| Fee Waiver or Reimbursement | (16.44%) | [2] | ||||
| Net Expenses (as a percentage of Assets) | 1.51% | |||||
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