S000014682 [Member] Fees and Expenses - Western Asset SMASh Series C Fund |
Feb. 28, 2025 |
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| Prospectus [Line Items] | ||||||||||
| Expense Heading [Optional Text] | Fees and expenses of the fund | |||||||||
| Expense Narrative [Text Block] | The accompanying table describes the fees and expenses that you may pay if you buy and hold shares of the fund. Shareholders should be aware that, as shown under “Management fees” in the table below, the fund pays no fees under its management and advisory agreements to the fund’s manager and subadviser. However, fund shares are only offered to participants in separately managed account programs who pay fees to program sponsors for the costs and expenses of the programs, including fees for investment advice, custody and portfolio execution. When a program participant, alone or with his or her program sponsor, elects to allocate assets to an investment strategy managed or advised by the fund’s subadviser or an affiliate of the subadviser, the subadviser or that affiliate typically receives a fee from the program sponsor for providing such management or advisory services to the managed account, including with respect to assets that may be invested in the fund. In certain cases, a program participant will pay a fee for investment advice directly to the subadviser or an affiliate in its capacity as manager, adviser or subadviser to the participant’s managed account.
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| Shareholder Fees Caption [Optional Text] | Shareholder fees(fees paid directly from your investment) | |||||||||
| Operating Expenses Caption [Optional Text] | Annual fund operating expenses (%)(expenses that you pay each year as a percentage of the value of your investment) | |||||||||
| Expense Example [Heading] | Example | |||||||||
| Expense Example Narrative [Text Block] | This example is intended to help you compare the cost of investing in the fund with the cost of investing in other mutual funds. The example assumes:
Although your actual costs may be higher or lower, based on these assumptions your costs would be:
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| Expense Example by, Year, Caption [Text] | Number of years you own your shares ($) | |||||||||
| Expense Example, No Redemption, By Year, Caption [Text] | Number of years you own your shares ($) | |||||||||
| Portfolio Turnover [Heading] | Portfolio turnover. | |||||||||
| Portfolio Turnover [Text Block] | The fund pays transaction costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when shares are held in a taxable account. These costs, which are not reflected in annual fund operating expenses or in the example, affect the fund’s performance. During the most recent fiscal year, the fund’s portfolio turnover rate was 6% of the average value of its portfolio. | |||||||||
| Portfolio Turnover, Rate | 6.00% |