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UBS Government Money Market Investments Fund (formerly, PACE® Government Money Market Investments)  
Risk/Return: rr_RiskReturnAbstract  
Risk/Return [Heading] rr_RiskReturnHeading UBS Government Money Market Investments Fund (formerly, PACE® Government Money Market Investments)
Objective [Heading] rr_ObjectiveHeading Investment objective
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock

Current income consistent with preservation of capital and liquidity.
Expense [Heading] rr_ExpenseHeading Fees and expenses of the fund
Expense Narrative [Text Block] rr_ExpenseNarrativeTextBlock

These tables describe the fees and expenses that you may pay if you buy and hold shares of the fund.
Shareholder Fees Caption [Text] rr_ShareholderFeesCaption Shareholder fees (fees paid directly from your investment)
Operating Expenses Caption [Text] rr_OperatingExpensesCaption Annual fund operating expenses (expenses that you pay each year as a percentage of the value of your investment)
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination Nov. 30, 2020
Expenses Restated to Reflect Current [Text] rr_ExpensesRestatedToReflectCurrent "Other expenses" have been restated to reflect current fees and are based on estimated amounts for the current fiscal year.
Expense Example [Heading] rr_ExpenseExampleHeading Example
Expense Example Narrative [Text Block] rr_ExpenseExampleNarrativeTextBlock

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:
Strategy [Heading] rr_StrategyHeading Principal strategies
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock

Principal investments


The fund is a money market mutual fund and seeks to maintain a stable price of $1.00 per share. To do this, the fund invests in a diversified portfolio of high quality, U.S. government money market instruments and in related repurchase agreements.


Money market instruments generally are short-term debt obligations and similar securities. They also may include longer-term bonds that have variable interest rates or other special features that give them the financial characteristics of short-term debt. The fund has adopted a policy to invest 99.5% or more of its total assets in cash, government securities, and/or repurchase agreements that are collateralized fully (i.e., collateralized by cash and/or government securities) in order to qualify as a "government money market fund" under federal regulations. By operating as a government money market fund, the fund is exempt from requirements that permit the imposition of a liquidity fee and/or temporary redemption gates. While the fund's board may elect to subject the fund to liquidity fee and gate requirements in the future, the board has not elected to do so at this time. Many US government money market instruments pay income that is generally exempt from state and local income tax, although they may be subject to corporate franchise tax in some states. In addition, under normal circumstances, the fund invests at least 80% of its net assets in US government securities, including government securities subject to repurchase agreements.


The fund may invest a significant percentage of its assets in repurchase agreements. Repurchase agreements are transactions in which the fund purchases government securities and simultaneously commits to resell them to the same counterparty at a future time and at a price reflecting a market rate of interest. Income from repurchase agreements may not be exempt from state and local income taxation. Repurchase agreements often offer a higher yield than investments directly in government securities. In deciding whether an investment in a repurchase agreement is more attractive than a direct investment in government securities, the fund considers the possible loss of this tax advantage.


Management process


UBS Asset Management (Americas) Inc. ("UBS AM"), the fund's manager and investment advisor, selects money market instruments for the fund based on its assessment of relative values and changes in market and economic conditions. UBS AM considers safety of principal and liquidity in selecting securities for the fund and thus may not buy securities that pay the highest yield.
Risk [Heading] rr_RiskHeading Principal risks
Risk Narrative [Text Block] rr_RiskNarrativeTextBlock

All investments carry a certain amount of risk, and the fund cannot guarantee that it will achieve its investment objective.


You could lose money by investing in the fund. Although the fund seeks to preserve the value of your investment at $1.00 per share, it cannot guarantee it will do so. An investment in the fund is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. The fund's sponsor has no legal obligation to provide financial support to the fund, and you should not expect that the sponsor will provide financial support to the fund at any time.


Money market instruments generally have a low risk of loss, but they are not risk-free. The principal risks presented by an investment in the fund are:


Credit risk: Issuers of money market instruments or financial institutions that have entered into repurchase agreements with the fund may fail to make payments when due or complete transactions or they may become less willing or less able to do so.


Interest rate risk: The value of the fund's investments generally will fall when short term interest rates rise, and its yield will tend to lag behind prevailing rates. The fund may face a heightened level of interest rate risk due to certain changes in monetary policy, such as certain types of interest rate changes by the Federal Reserve.


US government securities risk: There are different types of US government securities with different levels of credit risk, including the risk of default, depending on the nature of the particular government support for that security. For example, a US government-sponsored entity, such as Federal National Mortgage Association ("Fannie Mae") or Federal Home Loan Mortgage Corporation ("Freddie Mac"), although chartered or sponsored by an Act of Congress, may issue securities that are neither insured nor guaranteed by the US Treasury and are therefore riskier than those that are.


Market risk: The risk that the market value of the fund's investments may fluctuate, sometimes rapidly or unpredictably, as the markets fluctuate, which may affect the fund's ability to maintain a $1.00 share price. Market risk may affect a single issuer, industry, or sector of the economy, or it may affect the market as a whole. Moreover, changing market, economic, political and social conditions in one country or geographic region could adversely impact market, economic, political and social conditions in other countries or regions.


Liquidity risk: Although the fund invests in a diversified portfolio of high quality instruments, the fund's investments may become less liquid as a result of market developments or adverse investor perception.


Management risk: The risk that the investment strategies, techniques and risk analyses employed by UBS AM may not produce the desired results.
Risk Lose Money [Text] rr_RiskLoseMoney You could lose money by investing in the fund.
Risk Not Insured Depository Institution [Text] rr_RiskNotInsuredDepositoryInstitution An investment in the fund is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.
Risk Money Market Fund May Not Preserve Dollar [Text] rr_RiskMoneyMarketFundMayNotPreserveDollar Although the fund seeks to preserve the value of your investment at $1.00 per share, it cannot guarantee it will do so.
Risk Money Market Fund Price Fluctuates [Text] rr_RiskMoneyMarketFundPriceFluctuates The risk that the market value of the fund's investments may fluctuate, sometimes rapidly or unpredictably, as the markets fluctuate, which may affect the fund's ability to maintain a $1.00 share price.
Risk Money Market Fund Sponsor May Not Provide Support [Text] rr_RiskMoneyMarketFundSponsorMayNotProvideSupport The fund's sponsor has no legal obligation to provide financial support to the fund, and you should not expect that the sponsor will provide financial support to the fund at any time.
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading Performance
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock

Risk/return bar chart and table


The performance information that follows shows the fund's performance information in a bar chart and an average annual total returns table. The bar chart does not reflect any program fee or similar fee charged by advisory programs through which Class P shares of the fund may be held; if it did, the total returns shown would be lower. The information provides some indication of the risks of investing in the fund by showing changes in the fund's performance from year to year. The fund's past performance is not necessarily an indication of how the fund will perform in the future. Prior to November 27, 2019, the fund was named PACE Government Money Market Investments. Prior to November 28, 2015, the fund was named PACE Money Market Investments, and the fund operated under certain different investment policies. The fund's historical performance may not represent its current investment policies. Updated performance information is available by contacting your Financial Advisor or by calling 1-888-793 8637 (Option #1).

Performance Information Illustrates Variability of Returns [Text] rr_PerformanceInformationIllustratesVariabilityOfReturns The information provides some indication of the risks of investing in the fund by showing changes in the fund's performance from year to year.
Performance Past Does Not Indicate Future [Text] rr_PerformancePastDoesNotIndicateFuture The fund's past performance is not necessarily an indication of how the fund will perform in the future.
Bar Chart [Heading] rr_BarChartHeading UBS Government Money Market Investments Fund (formerly, PACE Government Money Market Investments) Annual Total Returns of Class P Shares
Bar Chart Does Not Reflect Sales Loads [Text] rr_BarChartDoesNotReflectSalesLoads The bar chart does not reflect any program fee or similar fee charged by advisory programs through which Class P shares of the fund may be held; if it did, the total returns shown would be lower.
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock

Total return January 1 - September 30, 2019: 1.34%
Best quarter during calendar years shown—4Q 2018: 0.41%
Worst quarters during calendar years shown—3Q 2009 & 1Q, 2Q & 3Q, 2010 & 1Q, 2011: 0.00%
(Actual total return was 0.0024%)
Year to Date Return, Label rr_YearToDateReturnLabel Total return
Bar Chart, Year to Date Return, Date rr_BarChartYearToDateReturnDate Sep. 30, 2019
Bar Chart, Year to Date Return rr_BarChartYearToDateReturn 1.34%
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Best quarter during calendar years shown
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Dec. 31, 2018
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 0.41%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Worst quarters during calendar years shown
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Mar. 31, 2011
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn 0.0024%
Average Annual Return, Caption rr_AverageAnnualReturnCaption Average annual total returns (figures do not reflect the deduction of the PACE Select Advisors Program Fee)(for the periods ended December 31, 2018)
UBS Government Money Market Investments Fund (formerly, PACE® Government Money Market Investments) | Class P  
Risk/Return: rr_RiskReturnAbstract  
Maximum front-end sales charge (load) imposed on purchases (as a % of the offering price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none [1]
Maximum deferred sales charge (load) rr_MaximumDeferredSalesChargeOverOfferingPrice none [1]
Management fees rr_ManagementFeesOverAssets 0.15% [2]
Distribution and/or service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets none
Other expenses (includes administration fee of 0.10%) rr_Component2OtherExpensesOverAssets 0.55% [3]
Total annual fund operating expenses rr_ExpensesOverAssets 0.70%
Management fee waiver/expense reimbursements rr_FeeWaiverOrReimbursementOverAssets 0.10% [4]
Total annual fund operating expenses after fee waiver and/or expense reimbursements rr_NetExpensesOverAssets 0.60% [4]
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 61 [5]
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 214 [5]
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 380 [5]
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 861 [5]
Annual Return 2009 rr_AnnualReturn2009 0.13%
Annual Return 2010 rr_AnnualReturn2010 0.01%
Annual Return 2011 rr_AnnualReturn2011 0.01%
Annual Return 2012 rr_AnnualReturn2012 0.01%
Annual Return 2013 rr_AnnualReturn2013 0.01%
Annual Return 2014 rr_AnnualReturn2014 0.01%
Annual Return 2015 rr_AnnualReturn2015 0.01%
Annual Return 2016 rr_AnnualReturn2016 0.01%
Annual Return 2017 rr_AnnualReturn2017 0.32%
Annual Return 2018 rr_AnnualReturn2018 1.27%
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 1.27%
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 0.32%
Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10 0.18%
Average Annual Returns, Inception Date rr_AverageAnnualReturnInceptionDate Aug. 24, 1995
[1] Class P shares held through the PACE Select Advisors Program are subject to a maximum Program fee of 2.50%. Class P shares held through other advisory programs also may be subject to a program fee.
[2] "Management fees" have been restated to reflect that, effective November 27, 2019, the management fee rate was reduced from 0.25% to 0.15%.
[3] "Other expenses" have been restated to reflect current fees and are based on estimated amounts for the current fiscal year.
[4] The fund and UBS Asset Management (Americas) Inc. ("UBS AM") have entered into a written fee waiver/expense reimbursement agreement pursuant to which UBS AM is contractually obligated to waive its management fees and/or reimburse expenses so that the fund's ordinary total operating expenses through November 30, 2020 (excluding dividend expense, borrowing costs, and interest expense relating to short sales, and expenses attributable to investment in other investment companies, interest, taxes, brokerage commissions and extraordinary expenses) would not exceed 0.60% for Class P. "Management fee waiver/expense reimbursements" are based on estimated amounts for the current fiscal year. The fund has agreed to repay UBS AM for any waived fees/reimbursed expenses to the extent that it can do so over the following three fiscal years without causing the class expenses in any of those three years to exceed this expense cap and that UBS AM has not waived the right to do so. The fee waiver/expense reimbursement agreement may be terminated by the fund's board at any time and also will terminate automatically upon the expiration or termination of the fund's advisory contract with UBS AM. Upon termination of the agreement, however, UBS AM's three year recoupment rights will survive.
[5] Except that the expenses reflect the effects of the fund's fee waiver/expense reimbursement agreement for the first year only.