Class Aand Class P [Member] Fees and Expenses - Class A and Class P - UBS Ultra Short Income Fund |
Apr. 30, 2026 |
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| Prospectus [Line Items] | |||
| Expense Heading [Optional Text] | Fees and expenses | ||
| Expense Narrative [Text Block] | These tables describe the fees and expenses that you may pay if you buy, hold and sell shares of the fund. In addition to the fees and expenses described below, you may also be required to pay commissions or other fees to your broker for transactions in Class P shares. Shares of the fund are available in classes other than Class P that have different fees and expenses.
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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) | ||
| Expenses Deferred Charges [Text Block] | Shares of the fund acquired through the exchange of shares of another Family Fund (“Family Funds” include PACE® Select funds, series of The UBS Funds and other funds for which UBS Asset Management (US) Inc. serves as principal underwriter) may be subject to a deferred sales charge if you later sell the fund shares acquired in the exchange, based on the terms of the shares of the Family Fund you originally held. | ||
| 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 that you invest $10,000 in the fund for the time periods indicated and then redeem all of your shares at the end of those periods unless otherwise stated. The example also assumes that your investment has a 5% return each year and that the fund’s operating expenses remain the same.* Although your actual costs may be higher or lower, based on these assumptions your costs would be:
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| Expense Example Footnotes [Text Block] |
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| Portfolio Turnover [Heading] | Portfolio turnover | ||
| Portfolio Turnover [Text Block] | The fund pays transaction costs, such as commissions or dealer spreads, 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 fund 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 fiscal year ended April 30, 2026, the fund’s portfolio turnover rate was 56% of the average value of its portfolio.
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| Portfolio Turnover, Rate | 56.00% |