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Risk/Return: rr_RiskReturnAbstract  
ProspectusDate rr_ProspectusDate Jun. 28, 2011
UBS Money Market Fund (Prospectus Summary) | UBS Money Market Fund
  
Risk/Return: rr_RiskReturnAbstract  
Risk/Return, Heading rr_RiskReturnHeading UBS Money Market Fund
Investment Objective, Heading rr_ObjectiveHeading Investment objective
investment Objective, Primary rr_ObjectivePrimaryTextBlock 
Maximum current income consistent with liquidity and conservation of capital.
Expense, Heading rr_ExpenseHeading Fees and expenses of the fund
Expense, Narrative 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 rr_ShareholderFeesCaption Shareholder fees (fees paid directly from your investment)
Operating Expenses, Caption rr_OperatingExpensesCaption Annual fund operating expenses (expenses that you pay each year as a percentage of the value of your investment)
Expense Example, Heading rr_ExpenseExampleHeading Example
Expense Example, Narrative 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:
Investment Strategy, Heading rr_StrategyHeading Principal strategies
Investment Strategy, Narrative rr_StrategyNarrativeTextBlock 
Principal investments

The fund is a money market 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 money market instruments of governmental and private issuers.

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 invests in foreign money market instruments only if
they are denominated in US dollars.

Management process

UBS Global Asset Management (Americas) Inc. ("UBS Global AM") selects money
market instruments for the fund based on its assessment of relative values and
changes in market and economic conditions. UBS Global 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 rr_RiskNarrativeTextBlock 
All investments carry a certain amount of risk, and the fund cannot guarantee
that it will achieve its investment objective. While the fund seeks to maintain
the value of your investment at $1.00 per share, you may lose money by investing
in the fund. An investment in the fund is not a bank deposit and is neither
insured nor guaranteed by the Federal Deposit Insurance Corporation or any other
government agency. 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 may fail to make payments when
due, 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
interest rates rise, and its yield will tend to lag behind prevailing rates.

Foreign investing risk: The value of the fund's investments in foreign
securities may fall due to adverse political, social and economic developments
abroad. However, because the fund's foreign investments must be denominated in
US dollars, it generally is not subject to the risk of changes in currency
valuations.

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, 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.

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 the investment advisor may not produce the desired results.
Risk, Money Market Fund rr_RiskMoneyMarketFund While the fund seeks to maintain the value of your investment at $1.00 per share, you may lose money by investing in the fund.
Risk, Not Insured Depository Institution rr_RiskNotInsuredDepositoryInstitution An investment in the fund is not a bank deposit and is neither insured nor guaranteed by the Federal Deposit Insurance Corporation or any other government agency.
Bar Chart and Performance Table, Heading rr_BarChartAndPerformanceTableHeading Performance
Performance, Narrative rr_PerformanceNarrativeTextBlock 
Risk/return bar chart and table

The following bar chart and table provide information about the fund's
performance and thus give some indication of the risks of an investment in the
fund.

The bar chart shows how the fund's performance has varied from year to year. The
bar chart shows Class B shares because they have the longest performance history
of any class of fund shares. The bar chart does not reflect the effect of sales
charges; if it did, the total returns shown would be lower.

The table that follows the bar chart shows the average annual returns over
various time periods for each class of the fund's shares. That table does
reflect fund sales charges.

The fund's past performance does not necessarily indicate how the fund will
perform in the future.
Performance, Information Illustrates Variability of Returns rr_PerformanceInformationIllustratesVariabilityOfReturns The following bar chart and table provide information about the fund's performance and thus give some indication of the risks of an investment in the fund.
Performance, Availability Phone Number rr_PerformanceAvailabilityPhone 1-888-793-8637
Performance, Past Does Not Indicate Future rr_PerformancePastDoesNotIndicateFuture The fund's past performance does not necessarily indicate how the fund will perform in the future.
Bar Chart, Heading rr_BarChartHeading Total Return on Class B shares
Bar Chart, Does Not Reflect Sales Loads rr_BarChartDoesNotReflectSalesLoads The bar chart does not reflect the effect of sales charges; if it did, the total returns shown would be lower.
Bar Chart, Footnotes rr_BarChartFootnotesTextBlock 
Updated performance information is available by contacting your Financial
Advisor or by calling 1-888-793-8637 (Option #1).
Bar Chart, Closing rr_BarChartClosingTextBlock 
Total return January 1 to March 31, 2011: 0.01%
Best quarter during years shown: first quarter, 2001: 1.04%
Worst quarter during years shown: second quarter, 2009: 0.00% (Actual total
return was 0.0025%)
Performance Table, Does Reflect Sales Loads rr_PerformanceTableDoesReflectSalesLoads The table that follows the bar chart shows the average annual returns over various time periods for each class of the fund's shares. That table does reflect fund sales charges.
Average Annual Returns, Caption rr_AverageAnnualReturnCaption Average annual total returns (for the periods ended December 31, 2010)
UBS Money Market Fund (Prospectus Summary) | UBS Money Market Fund | Class B
  
Risk/Return: rr_RiskReturnAbstract  
Year to Date Return, Label rr_YearToDateReturnLabel Total return January 1 to March 31, 2011:
Bar Chart, Year to Date Return, Date rr_BarChartYearToDateReturnDate Mar. 31, 2011
Bar Chart, Year to Date Return rr_BarChartYearToDateReturn 0.01%
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Best quarter
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Mar. 31, 2001
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 1.04%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Worst quarter
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Jun. 30, 2009
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn 0.00%
UBS Money Market Fund | Class A
  
Risk/Return: rr_RiskReturnAbstract  
Maximum front-end sales charge (load) imposed on purchases (as a % of the offering price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum deferred sales charge (load) (as a % of the lesser of the offering price or the redemption price) rr_MaximumDeferredSalesChargeOverOfferingPrice none
Exchange fee rr_ExchangeFee none
Management fees rr_ManagementFeesOverAssets 0.50%
Distribution and/or service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Other expenses rr_OtherExpensesOverAssets 1.20%
Total annual fund operating expenses rr_ExpensesOverAssets 1.95%
Management fee waiver/expense reimbursements rr_FeeWaiverOrReimbursementOverAssets (1.00%) [1]
Total annual fund operating expenses after fee waiver and/or expense reimbursement rr_NetExpensesOverAssets 0.95% [1]
Expense Example, With Redemption, 1 Year rr_ExpenseExampleYear01 97
Expense Example, With Redemption, 3 Years rr_ExpenseExampleYear03 515
Expense Example, With Redemption, 5 Years rr_ExpenseExampleYear05 959
Expense Example, With Redemption, 10 Years rr_ExpenseExampleYear10 2,194
Average Annual Returns, Label rr_AverageAnnualReturnLabel Class A
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 0.01%
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 1.91%
Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10 1.60%
Average Annual Returns, Inception Date rr_AverageAnnualReturnInceptionDate Jul. 01, 1991
UBS Money Market Fund | Class B
  
Risk/Return: rr_RiskReturnAbstract  
Maximum front-end sales charge (load) imposed on purchases (as a % of the offering price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum deferred sales charge (load) (as a % of the lesser of the offering price or the redemption price) rr_MaximumDeferredSalesChargeOverOfferingPrice 5.00%
Exchange fee rr_ExchangeFee none
Management fees rr_ManagementFeesOverAssets 0.50%
Distribution and/or service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets 0.75%
Other expenses rr_OtherExpensesOverAssets 1.37%
Total annual fund operating expenses rr_ExpensesOverAssets 2.62%
Management fee waiver/expense reimbursements rr_FeeWaiverOrReimbursementOverAssets (1.17%) [1]
Total annual fund operating expenses after fee waiver and/or expense reimbursement rr_NetExpensesOverAssets 1.45% [1]
Expense Example, With Redemption, 1 Year rr_ExpenseExampleYear01 648
Expense Example, With Redemption, 3 Years rr_ExpenseExampleYear03 1,003
Expense Example, With Redemption, 5 Years rr_ExpenseExampleYear05 1,486
Expense Example, With Redemption, 10 Years rr_ExpenseExampleYear10 2,553 [2]
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 148
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 703
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 1,286
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 2,553 [2]
Annual Return 2001 rr_AnnualReturn2001 2.54%
Annual Return 2002 rr_AnnualReturn2002 0.16%
Annual Return 2003 rr_AnnualReturn2003 0.14%
Annual Return 2004 rr_AnnualReturn2004 0.13%
Annual Return 2005 rr_AnnualReturn2005 0.94%
Annual Return 2006 rr_AnnualReturn2006 3.06%
Annual Return 2007 rr_AnnualReturn2007 3.79%
Annual Return 2008 rr_AnnualReturn2008 1.02%
Annual Return 2009 rr_AnnualReturn2009 0.02%
Annual Return 2010 rr_AnnualReturn2010 0.01%
Average Annual Returns, Label rr_AverageAnnualReturnLabel Class B [3]
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 (4.99%)
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 1.19%
Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10 1.29%
Average Annual Returns, Inception Date rr_AverageAnnualReturnInceptionDate Sep. 26, 1986
UBS Money Market Fund | Class C
  
Risk/Return: rr_RiskReturnAbstract  
Maximum front-end sales charge (load) imposed on purchases (as a % of the offering price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum deferred sales charge (load) (as a % of the lesser of the offering price or the redemption price) rr_MaximumDeferredSalesChargeOverOfferingPrice 1.00%
Exchange fee rr_ExchangeFee none
Management fees rr_ManagementFeesOverAssets 0.50%
Distribution and/or service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets 0.75%
Other expenses rr_OtherExpensesOverAssets 1.23%
Total annual fund operating expenses rr_ExpensesOverAssets 2.48%
Management fee waiver/expense reimbursements rr_FeeWaiverOrReimbursementOverAssets (1.03%) [1]
Total annual fund operating expenses after fee waiver and/or expense reimbursement rr_NetExpensesOverAssets 1.45% [1]
Expense Example, With Redemption, 1 Year rr_ExpenseExampleYear01 248
Expense Example, With Redemption, 3 Years rr_ExpenseExampleYear03 674
Expense Example, With Redemption, 5 Years rr_ExpenseExampleYear05 1,228
Expense Example, With Redemption, 10 Years rr_ExpenseExampleYear10 2,738
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 148
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 674
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 1,228
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 2,738
Average Annual Returns, Label rr_AverageAnnualReturnLabel Class C
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 (0.99%)
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 1.57%
Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10 1.17%
Average Annual Returns, Inception Date rr_AverageAnnualReturnInceptionDate Jul. 14, 1992
[1] The fund and UBS Global Asset Management (Americas) Inc. ("UBS Global AM") have entered into a written fee waiver/expense reimbursement agreement pursuant to which UBS Global AM is contractually obligated to waive its management fees and/or reimburse the fund so that the fund's operating expenses through June 30, 2012 (excluding interest expense, if any, and extraordinary items) would not exceed the following: Class A, 0.95%, Class B, 1.45%, and Class C, 1.45%. The fund has agreed to repay UBS Global AM for any waived fees/reimbursed expenses to the extent that it can do so over the three years following such waived fees/reimbursed expenses without causing the fund's expenses in any of those three years to exceed the expense cap. 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 Global AM. Upon termination of the agreement, however, UBS Global AM's three year recoupment rights will survive.
[2] Reflects conversion to Class A shares after a maximum of 6 years.
[3] Assumes conversion of Class B shares to Class A shares after six years.