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Risk/Return:rr_RiskReturnAbstract 
ProspectusDaterr_ProspectusDateOct. 28, 2011
UBS U.S. SMALL CAP GROWTH FUND (Prospectus Summary) | UBS U.S. SMALL CAP GROWTH FUND
 
Risk/Return:rr_RiskReturnAbstract 
Risk/Return, Headingrr_RiskReturnHeadingUBS U.S. Small Cap Growth Fund Summary
Investment Objective, Headingrr_ObjectiveHeadingInvestment objective
investment Objective, Primaryrr_ObjectivePrimaryTextBlock
The Fund seeks to provide long-term capital appreciation.
Expense, Headingrr_ExpenseHeadingFees and expenses
Expense, Narrativerr_ExpenseNarrativeTextBlock
These tables describe the fees and expenses that you may pay if you buy and hold
shares of the Fund. You may qualify for a sales charge waiver or discount if you
and your family invest, or agree to invest in the future, at least $50,000 in
the Fund. More information about these and other discounts and waivers, as well
as eligibility requirements for each share class, is available from your
financial advisor and in "Managing your fund account" on page 36 of the Fund's
prospectus and in "Reduced sales charges, additional purchase, exchange and
redemption information and other services" on page 103 of the Fund's statement
of additional information ("SAI").
Shareholder Fees, Captionrr_ShareholderFeesCaptionShareholder fees (fees paid directly from your investment)
Operating Expenses, Captionrr_OperatingExpensesCaptionAnnual fund operating expenses (expenses that you pay each year as a percentage of the value of your investment)
Portfolio Turnover, Headingrr_PortfolioTurnoverHeadingPortfolio turnover
Portfolio Turnoverrr_PortfolioTurnoverTextBlock
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 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 most recent fiscal year, the Fund's portfolio turnover rate was 55%
of the average value of its portfolio.
Portfolio Turnover, Raterr_PortfolioTurnoverRate55.00%
Expense Breakpoint, Discountsrr_ExpenseBreakpointDiscountsYou may qualify for a sales charge waiver or discount if you and your family invest, or agree to invest in the future, at least $50,000 in the Fund.
Expense Breakpoint, Minimum Investment Required Amountrr_ExpenseBreakpointMinimumInvestmentRequiredAmount$ 50,000
Acquired Fund Fees and Expenses, Based on Estimatesrr_AcquiredFundFeesAndExpensesBasedOnEstimatesSince the "Acquired fund fees and expenses" are not directly borne by the Fund, they are not reflected in the Fund's financial statements, and therefore the amounts listed in "Total annual fund operating expenses" and "Total annual fund operating expenses after management fee waiver/expense reimbursements" will differ from those presented in the Financial highlights.
Expense Example, Headingrr_ExpenseExampleHeadingExample
Expense Example, Narrativerr_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 sell 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. The costs described in the example reflect
the expenses of the Fund that would result from the contractual fee waiver and
expense reimbursement agreement with the Advisor for the first year only.
Although your actual costs may be higher or lower, based on these assumptions,
your costs would be:
Investment Strategy, Headingrr_StrategyHeadingPrincipal strategies
Investment Strategy, Narrativerr_StrategyNarrativeTextBlock
Principal investments

Under normal circumstances, the Fund invests at least 80% of its net assets
(plus borrowings for investment purposes, if any) in equity securities of US
small capitalization companies. Small capitalization companies are those
companies with market capitalizations of less than $3 billion. However, the Fund
may invest a portion of its assets in securities outside of this range.
Investments in equity securities may include, but are not limited to, common
stock and preferred stock. The Fund may invest up to 20% of its net assets in
foreign securities.

The Fund may, but is not required to, use exchange-traded or over-the-counter
derivative instruments for risk management purposes or as part of the Fund's
investment strategies. The derivatives in which the Fund may invest include
futures and forward currency agreements. These derivatives may be used for risk
management purposes to manage or adjust the risk profile of the Fund. Futures on
currencies and forward currency agreements may also be used to hedge against a
specific currency. In addition, futures on indices may be used for investment
(non-hedging) purposes to earn income; to enhance returns; to replace more
traditional direct investments; or to obtain exposure to certain markets.

Under certain market conditions, the Fund may invest in companies at the time of
their initial public offering ("IPO").

Management process

In selecting securities, the Advisor seeks to invest in companies that possess
dominant market positions or franchises, a major technological edge, or a unique
competitive advantage. To this end, the Advisor considers earnings revision
trends, positive stock price momentum and sales acceleration when selecting
securities. The Fund may invest in emerging growth companies, which are
companies that the Advisor expects to experience above-average earnings or cash
flow growth or meaningful changes in underlying asset values.
Risk, Headingrr_RiskHeadingMain risks
Risk, Narrativerr_RiskNarrativeTextBlock
All investments carry a certain amount of risk and the Fund cannot guarantee
that it will achieve its investment objective. You may lose money by investing
in the Fund. An investment in the Fund is not a deposit of the bank and is not
insured or guaranteed by the Federal Deposit Insurance Corporation or any other
government agency. Below are some of the specific risks of investing in the
Fund.

Market risk: The market value of the Fund's investments may fluctuate, sometimes
rapidly or unpredictably, as the stock and bond markets fluctuate. Market risk
may affect a single issuer, industry, or sector of the economy, or it may affect
the market as a whole.

Limited capitalization risk: The risk that securities of smaller capitalization
companies tend to be more volatile and less liquid than securities of larger
capitalization companies. This can have a disproportionate effect on the market
price of smaller capitalization companies and affect the Fund's ability to
purchase or sell these securities. In general, smaller capitalization companies
are more vulnerable than larger companies to adverse business or economic
developments and they may have more limited resources.

Management risk: The risk that the investment strategies, techniques and risk
analyses employed by the Advisor may not produce the desired results.

IPOs risk: The purchase of shares issued in IPOs may expose the Fund to the
risks associated with issuers that have no operating history as public
companies, as well as to the risks associated with the sectors of the market in
which the issuer operates. The market for IPO shares may be volatile, and share
prices of newly-public companies may fluctuate significantly over a short period
of time.

Derivatives risk: The value of "derivatives"-so called because their value
"derives" from the value of an underlying asset, reference rate or index-may
rise or fall more rapidly than other investments. When using derivatives for
non-hedging purposes, it is possible for the Fund to lose more than the amount
it invested in the derivative. The risks of investing in derivative instruments
also include market and management risks. In addition, non-exchange traded
derivatives may be subject to liquidity risk, credit risk and mispricing or
valuation complexity. These derivatives risks are different from, and may be
greater than, the risks associated with investing directly in securities and
other instruments.

Leverage risk associated with financial instruments: The use of financial
instruments to increase potential returns, including derivatives used for
investment (non-hedging) purposes, may cause the Fund to be more volatile than
if it had not been leveraged. The use of leverage may also accelerate the
velocity of losses and can result in losses to the Fund that exceed the amount
originally invested.

Foreign investing risk: The value of the Fund's investments in foreign
securities may fall due to adverse political, social and economic developments
abroad and due to decreases in foreign currency values relative to the US
dollar. Also, foreign securities are sometimes less liquid and more difficult to
sell and to value than securities of US issuers.
Risk, Lose Moneyrr_RiskLoseMoneyYou may lose money by investing in the Fund.
Risk, Not Insured Depository Institutionrr_RiskNotInsuredDepositoryInstitution An investment in the Fund is not a deposit of the bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.
Bar Chart and Performance Table, Headingrr_BarChartAndPerformanceTableHeadingPerformance
Performance, Narrativerr_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
information provides some indication of the risks of investing in the Fund by
showing changes in the Fund's performance from year to year and by showing how
the Fund's average annual total returns compare with those of a broad measure of
market performance. Index reflects no deduction for fees, expenses or taxes. The
Fund's past performance (before and after taxes) is not necessarily an
indication of how the Fund will perform in the future. Updated performance for
the Fund is available at http://globalam-us.ubs.com/corpweb/performance.do.

After-tax returns are calculated using the historical highest individual federal
marginal income tax rates and do not reflect the impact of state and local
taxes. Actual after-tax returns depend on an investor's tax situation and may
differ from those shown. In addition, the after-tax returns shown are not
relevant to investors who hold Fund shares through tax-deferred arrangements,
such as 401(k) plans or individual retirement accounts. After-tax returns for
other classes will vary from the Class Y shares' after-tax returns shown.
Performance, Information Illustrates Variability of Returnsrr_PerformanceInformationIllustratesVariabilityOfReturnsThe performance information that follows shows the Fund's performance information in a bar chart and an average annual total returns table. 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 and by showing how the Fund's average annual total returns compare with those of a broad measure of market performance.
Performance, Availability Website Addressrr_PerformanceAvailabilityWebSiteAddresshttp://globalam-us.ubs.com/corpweb/performance.do
Performance, Past Does Not Indicate Futurerr_PerformancePastDoesNotIndicateFutureThe Fund's past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future.
Bar Chart, Headingrr_BarChartHeadingUBS U.S. Small Cap Growth Fund Annual Total Returns Of Class Y Shares
Bar Chart, Closingrr_BarChartClosingTextBlock
Total return January 1 - September 30, 2011: (11.71)%
Best quarter during calendar years shown-4Q 2010: 20.11%
Worst quarter during calendar years shown-4Q 2008: (32.03)%
Index No Deduction for Fees, Expenses, Taxesrr_IndexNoDeductionForFeesExpensesTaxesIndex reflects no deduction for fees, expenses or taxes.
Performance Table, Uses Highest Federal Raterr_PerformanceTableUsesHighestFederalRateAfter-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes.
Performance Table, Not Relevant to Tax Deferredrr_PerformanceTableNotRelevantToTaxDeferredthe after-tax returns shown are not relevant to investors who hold Fund shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts.
Performance Table, One Class of after Tax Shownrr_PerformanceTableOneClassOfAfterTaxShownAfter-tax returns for other classes will vary from the Class Y shares' after-tax returns shown.
Average Annual Returns, Captionrr_AverageAnnualReturnCaptionAverage annual total returns (for the periods ended December 31, 2010)
UBS U.S. SMALL CAP GROWTH FUND (Prospectus Summary) | UBS U.S. SMALL CAP GROWTH FUND | CLASS A
 
Risk/Return:rr_RiskReturnAbstract 
Fee Waiver or Reimbursement and Recoupments over Assets, Date of Terminationck0000886244_FeeWaiverOrReimbursementAndRecoupmentsOverAssetsDateOfTermination2012-10-27
UBS U.S. SMALL CAP GROWTH FUND (Prospectus Summary) | UBS U.S. SMALL CAP GROWTH FUND | CLASS B
 
Risk/Return:rr_RiskReturnAbstract 
Fee Waiver or Reimbursement and Recoupments over Assets, Date of Terminationck0000886244_FeeWaiverOrReimbursementAndRecoupmentsOverAssetsDateOfTermination2012-10-27
UBS U.S. SMALL CAP GROWTH FUND (Prospectus Summary) | UBS U.S. SMALL CAP GROWTH FUND | CLASS C
 
Risk/Return:rr_RiskReturnAbstract 
Fee Waiver or Reimbursement and Recoupments over Assets, Date of Terminationck0000886244_FeeWaiverOrReimbursementAndRecoupmentsOverAssetsDateOfTermination2012-10-27
UBS U.S. SMALL CAP GROWTH FUND (Prospectus Summary) | UBS U.S. SMALL CAP GROWTH FUND | CLASS Y
 
Risk/Return:rr_RiskReturnAbstract 
Fee Waiver or Reimbursement and Recoupments over Assets, Date of Terminationck0000886244_FeeWaiverOrReimbursementAndRecoupmentsOverAssetsDateOfTermination2012-10-27
Year to Date Return, Labelrr_YearToDateReturnLabelTotal return January 1 - September 30, 2011:
Bar Chart, Year to Date Return, Daterr_BarChartYearToDateReturnDateSep. 30, 2011
Bar Chart, Year to Date Returnrr_BarChartYearToDateReturn(11.71%)
Highest Quarterly Return, Labelrr_HighestQuarterlyReturnLabelBest quarter during calendar years shown-4Q 2010:
Highest Quarterly Return, Daterr_BarChartHighestQuarterlyReturnDateDec. 31, 2010
Highest Quarterly Returnrr_BarChartHighestQuarterlyReturn20.11%
Lowest Quarterly Return, Labelrr_LowestQuarterlyReturnLabelWorst quarter during calendar years shown-4Q 2008:
Lowest Quarterly Return, Daterr_BarChartLowestQuarterlyReturnDateDec. 31, 2008
Lowest Quarterly Returnrr_BarChartLowestQuarterlyReturn(32.03%)
UBS U.S. SMALL CAP GROWTH FUND | Russell 2000 Growth Index
 
Risk/Return:rr_RiskReturnAbstract 
Average Annual Returns, Labelrr_AverageAnnualReturnLabelRussell 2000 Growth Index
Average Annual Returns, 1 Yearrr_AverageAnnualReturnYear0129.09%
Average Annual Returns, 5 Yearsrr_AverageAnnualReturnYear055.30%
Average Annual Returns, 10 Yearsrr_AverageAnnualReturnYear103.78%
Average Annual Returns, Since Inceptionrr_AverageAnnualReturnSinceInception [1]
UBS U.S. SMALL CAP GROWTH FUND | CLASS A
 
Risk/Return:rr_RiskReturnAbstract 
Maximum front-end sales charge (load) imposed on purchases (as a % of offering price)rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice5.50%
Maximum contingent deferred sales charge (load) (CDSC) (as a % of purchase or sales price, whichever is less)rr_MaximumDeferredSalesChargeOverOfferingPrice none
Redemption fee (as a % of amount redeemed within 90 days of purchase, if applicable)rr_RedemptionFeeOverRedemption(1.00%)
Management feesrr_ManagementFeesOverAssets0.85%
Distribution and/or service (12b-1) feesrr_DistributionAndService12b1FeesOverAssets0.25%
Other expensesrr_OtherExpensesOverAssets0.44%
Acquired fund fees and expensesrr_AcquiredFundFeesAndExpensesOverAssets0.01%
Total annual fund operating expensesrr_ExpensesOverAssets1.55%[2]
Less management fee waiver/expense reimbursements or (recoupment)ck0000886244_FeeWaiverOrReimbursementAndRecoupmentsOverAssets0.0014
Total annual fund operating expenses after management fee waiver/expense reimbursements or (recoupment)rr_NetExpensesOverAssets1.41%[2],[3]
Expense Example, With Redemption, 1 Yearrr_ExpenseExampleYear01686
Expense Example, With Redemption, 3 Yearsrr_ExpenseExampleYear031,000
Expense Example, With Redemption, 5 Yearsrr_ExpenseExampleYear051,336
Expense Example, With Redemption, 10 Yearsrr_ExpenseExampleYear102,283
Average Annual Returns, Labelrr_AverageAnnualReturnLabelClass A Return before taxes
Average Annual Returns, 1 Yearrr_AverageAnnualReturnYear0130.64%
Average Annual Returns, 5 Yearsrr_AverageAnnualReturnYear051.89%
Average Annual Returns, 10 Yearsrr_AverageAnnualReturnYear103.12%
Average Annual Returns, Since Inceptionrr_AverageAnnualReturnSinceInception7.36%
Average Annual Returns, Inception Daterr_AverageAnnualReturnInceptionDateDec. 31, 1998
UBS U.S. SMALL CAP GROWTH FUND | CLASS B
 
Risk/Return:rr_RiskReturnAbstract 
Maximum front-end sales charge (load) imposed on purchases (as a % of offering price)rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum contingent deferred sales charge (load) (CDSC) (as a % of purchase or sales price, whichever is less)rr_MaximumDeferredSalesChargeOverOfferingPrice5.00%
Redemption fee (as a % of amount redeemed within 90 days of purchase, if applicable)rr_RedemptionFeeOverRedemption(1.00%)
Management feesrr_ManagementFeesOverAssets0.85%
Distribution and/or service (12b-1) feesrr_DistributionAndService12b1FeesOverAssets1.00%
Other expensesrr_OtherExpensesOverAssets0.40%
Acquired fund fees and expensesrr_AcquiredFundFeesAndExpensesOverAssets0.01%
Total annual fund operating expensesrr_ExpensesOverAssets2.26%[2]
Less management fee waiver/expense reimbursements or (recoupment)ck0000886244_FeeWaiverOrReimbursementAndRecoupmentsOverAssets0.0010
Total annual fund operating expenses after management fee waiver/expense reimbursements or (recoupment)rr_NetExpensesOverAssets2.16%[2],[3]
Expense Example, With Redemption, 1 Yearrr_ExpenseExampleYear01719
Expense Example, With Redemption, 3 Yearsrr_ExpenseExampleYear03997
Expense Example, With Redemption, 5 Yearsrr_ExpenseExampleYear051,401
Expense Example, With Redemption, 10 Yearsrr_ExpenseExampleYear102,245
Expense Example, No Redemption, 1 Yearrr_ExpenseExampleNoRedemptionYear01219
Expense Example, No Redemption, 3 Yearsrr_ExpenseExampleNoRedemptionYear03697
Expense Example, No Redemption, 5 Yearsrr_ExpenseExampleNoRedemptionYear051,201
Expense Example, No Redemption, 10 Yearsrr_ExpenseExampleNoRedemptionYear102,245
Average Annual Returns, Labelrr_AverageAnnualReturnLabelClass B Return before taxes
Average Annual Returns, 1 Yearrr_AverageAnnualReturnYear0132.26%
Average Annual Returns, 5 Yearsrr_AverageAnnualReturnYear051.96%
Average Annual Returns, 10 Yearsrr_AverageAnnualReturnYear10 
Average Annual Returns, Since Inceptionrr_AverageAnnualReturnSinceInception5.79%
Average Annual Returns, Inception Daterr_AverageAnnualReturnInceptionDateNov. 07, 2001
UBS U.S. SMALL CAP GROWTH FUND | CLASS C
 
Risk/Return:rr_RiskReturnAbstract 
Maximum front-end sales charge (load) imposed on purchases (as a % of offering price)rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum contingent deferred sales charge (load) (CDSC) (as a % of purchase or sales price, whichever is less)rr_MaximumDeferredSalesChargeOverOfferingPrice1.00%
Redemption fee (as a % of amount redeemed within 90 days of purchase, if applicable)rr_RedemptionFeeOverRedemption(1.00%)
Management feesrr_ManagementFeesOverAssets0.85%
Distribution and/or service (12b-1) feesrr_DistributionAndService12b1FeesOverAssets1.00%
Other expensesrr_OtherExpensesOverAssets0.52%
Acquired fund fees and expensesrr_AcquiredFundFeesAndExpensesOverAssets0.01%
Total annual fund operating expensesrr_ExpensesOverAssets2.38%[2]
Less management fee waiver/expense reimbursements or (recoupment)ck0000886244_FeeWaiverOrReimbursementAndRecoupmentsOverAssets0.0022
Total annual fund operating expenses after management fee waiver/expense reimbursements or (recoupment)rr_NetExpensesOverAssets2.16%[2],[3]
Expense Example, With Redemption, 1 Yearrr_ExpenseExampleYear01319
Expense Example, With Redemption, 3 Yearsrr_ExpenseExampleYear03722
Expense Example, With Redemption, 5 Yearsrr_ExpenseExampleYear051,251
Expense Example, With Redemption, 10 Yearsrr_ExpenseExampleYear102,700
Expense Example, No Redemption, 1 Yearrr_ExpenseExampleNoRedemptionYear01219
Expense Example, No Redemption, 3 Yearsrr_ExpenseExampleNoRedemptionYear03722
Expense Example, No Redemption, 5 Yearsrr_ExpenseExampleNoRedemptionYear051,251
Expense Example, No Redemption, 10 Yearsrr_ExpenseExampleNoRedemptionYear102,700
Average Annual Returns, Labelrr_AverageAnnualReturnLabelClass C Return before taxes[4]
Average Annual Returns, 1 Yearrr_AverageAnnualReturnYear0136.27%
Average Annual Returns, 5 Yearsrr_AverageAnnualReturnYear052.30%
Average Annual Returns, 10 Yearsrr_AverageAnnualReturnYear10 
Average Annual Returns, Since Inceptionrr_AverageAnnualReturnSinceInception5.31%
Average Annual Returns, Inception Daterr_AverageAnnualReturnInceptionDateNov. 19, 2001
UBS U.S. SMALL CAP GROWTH FUND | CLASS Y
 
Risk/Return:rr_RiskReturnAbstract 
Maximum front-end sales charge (load) imposed on purchases (as a % of offering price)rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum contingent deferred sales charge (load) (CDSC) (as a % of purchase or sales price, whichever is less)rr_MaximumDeferredSalesChargeOverOfferingPrice none
Redemption fee (as a % of amount redeemed within 90 days of purchase, if applicable)rr_RedemptionFeeOverRedemption(1.00%)
Management feesrr_ManagementFeesOverAssets0.85%
Distribution and/or service (12b-1) feesrr_DistributionAndService12b1FeesOverAssets none
Other expensesrr_OtherExpensesOverAssets0.28%
Acquired fund fees and expensesrr_AcquiredFundFeesAndExpensesOverAssets0.01%
Total annual fund operating expensesrr_ExpensesOverAssets1.14%[2]
Less management fee waiver/expense reimbursements or (recoupment)ck0000886244_FeeWaiverOrReimbursementAndRecoupmentsOverAssets(0.0002)
Total annual fund operating expenses after management fee waiver/expense reimbursements or (recoupment)rr_NetExpensesOverAssets1.16%[2],[3]
Expense Example, With Redemption, 1 Yearrr_ExpenseExampleYear01118
Expense Example, With Redemption, 3 Yearsrr_ExpenseExampleYear03364
Expense Example, With Redemption, 5 Yearsrr_ExpenseExampleYear05630
Expense Example, With Redemption, 10 Yearsrr_ExpenseExampleYear10$ 1,388
Annual Return 2001rr_AnnualReturn2001(10.23%)
Annual Return 2002rr_AnnualReturn2002(18.42%)
Annual Return 2003rr_AnnualReturn200344.75%
Annual Return 2004rr_AnnualReturn200410.92%
Annual Return 2005rr_AnnualReturn20056.63%
Annual Return 2006rr_AnnualReturn20068.59%
Annual Return 2007rr_AnnualReturn20074.96%
Annual Return 2008rr_AnnualReturn2008(44.11%)
Annual Return 2009rr_AnnualReturn200933.41%
Annual Return 2010rr_AnnualReturn201038.62%
Average Annual Returns, Labelrr_AverageAnnualReturnLabelClass Y Return before taxes
Average Annual Returns, 1 Yearrr_AverageAnnualReturnYear0138.62%
Average Annual Returns, 5 Yearsrr_AverageAnnualReturnYear053.33%
Average Annual Returns, 10 Yearsrr_AverageAnnualReturnYear103.98%
Average Annual Returns, Since Inceptionrr_AverageAnnualReturnSinceInception6.34%
Average Annual Returns, Inception Daterr_AverageAnnualReturnInceptionDateSep. 30, 1997
UBS U.S. SMALL CAP GROWTH FUND | CLASS Y | After Taxes on Distributions
 
Risk/Return:rr_RiskReturnAbstract 
Average Annual Returns, Labelrr_AverageAnnualReturnLabelClass Y Return after taxes on distributions
Average Annual Returns, 1 Yearrr_AverageAnnualReturnYear0138.62%
Average Annual Returns, 5 Yearsrr_AverageAnnualReturnYear052.91%
Average Annual Returns, 10 Yearsrr_AverageAnnualReturnYear103.58%
Average Annual Returns, Since Inceptionrr_AverageAnnualReturnSinceInception5.47%
Average Annual Returns, Inception Daterr_AverageAnnualReturnInceptionDateSep. 30, 1997
UBS U.S. SMALL CAP GROWTH FUND | CLASS Y | After Taxes on Distributions and Sales
 
Risk/Return:rr_RiskReturnAbstract 
Average Annual Returns, Labelrr_AverageAnnualReturnLabelClass Y Return after taxes on distributions and sale of fund shares
Average Annual Returns, 1 Yearrr_AverageAnnualReturnYear0125.11%
Average Annual Returns, 5 Yearsrr_AverageAnnualReturnYear052.73%
Average Annual Returns, 10 Yearsrr_AverageAnnualReturnYear103.32%
Average Annual Returns, Since Inceptionrr_AverageAnnualReturnSinceInception5.12%
Average Annual Returns, Inception Daterr_AverageAnnualReturnInceptionDateSep. 30, 1997
[1]Average annual total returns for the Russell 2000 Growth Index for the life of each class were as follows: Class A--4.04%; Class B--6.47%; Class C--6.03%; Class Y--3.08%.
[2]Since the "Acquired fund fees and expenses" are not directly borne by the Fund, they are not reflected in the Fund's financial statements, and therefore the amounts listed in "Total annual fund operating expenses" and "Total annual fund operating expenses after management fee waiver/expense reimbursements" will differ from those presented in the Financial highlights.
[3]The Trust, with respect to the Fund, and UBS Global Asset Management (Americas) Inc., the Fund's investment advisor ("UBS Global AM (Americas)" or the "Advisor"), have entered into a written agreement pursuant to which the Advisor has agreed to waive a portion of its management fees and/or to reimburse expenses (excluding expenses incurred through investment in other investment companies, interest, taxes, brokerage commissions, extraordinary expenses, dividend expense and security loan fees for securities sold short) to the extent necessary so that the Fund's ordinary operating expenses (excluding expenses incurred through investment in other investment companies, interest, taxes, brokerage commissions , extraordinary expenses, dividend expense and security loan fees for securities sold short), through the period ending October 27, 2012, do not exceed 1.40% for Class A shares, 2.15% for Class B shares, 2.15% for Class C shares and 1.15% for Class Y shares. Pursuant to the written agreement, the Advisor is entitled to be reimbursed for any fees it waives and expenses it reimburses for a period of three years following such fee waivers and expense reimbursements to the extent that such reimbursement of the Advisor by the Fund will not cause the Fund to exceed any applicable expense limit that is in place for the Fund.
[4]Prior to September 30, 2003, Class C shares were subject to a maximum front-end sales charge of 1.00%; this front-end sales charge is not reflected in the average annual total returns presented for the Class C shares shown above.