IRA RMA Program [Member] Fees and Expenses - UBS Liquid Assets Government Fund	Apr. 30, 2026
Prospectus [Line Items]
Expense Heading [Optional Text]	Fees and expenses of the fund
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. You may pay other fees, such as fees to financial intermediaries, which are not reflected in the table or example below.
Expenses Restated to Reflect Current [Text]	“Management fees” have been restated to reflect amounts for the current fiscal year.
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 Footnotes [Text Block]	UBS Financial Services Inc. may charge other account fees for certain other features offered through its programs. Please contact your Financial Advisor for more information, including the timing of the assessment of any applicable fee to your account. Certain types of accounts are not subject to the above referenced program fees.
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. 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:
Expense Example Closing [Text Block]	This example does not reflect the above referenced program fees.

IRA RMA Program [Member] Fees and Expenses - UBS Liquid Assets Government Fund

Apr. 30, 2026

Fees and expenses of the fund

These tables describe the fees and expenses that you may pay if you buy, hold and sell shares of the fund. You may pay other fees, such as fees to financial intermediaries, which are not reflected in the table or example below.

Expenses Restated to Reflect Current [Text]

“Management fees” have been restated to reflect amounts for the current fiscal year.

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 Footnotes [Text Block]

UBS Financial Services Inc. may charge other account fees for certain other features offered through its programs. Please contact your Financial Advisor for more information, including the timing of the assessment of any applicable fee to your account. Certain types of accounts are not subject to the above referenced program fees.

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. 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:

Expense Example Closing [Text Block]

This example does not reflect the above referenced program fees.