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UBS U.S. Sustainable Equity Fund  
Risk/Return: rr_RiskReturnAbstract  
Risk/Return [Heading] rr_RiskReturnHeading UBS U.S. Sustainable Equity Fund
Objective [Heading] rr_ObjectiveHeading Investment objective
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock

The Fund seeks to maximize total return, consisting of capital appreciation and current income.
Expense [Heading] rr_ExpenseHeading Fees and expenses
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. 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 73 of the Fund's prospectus and in "Reduced sales charges, additional purchase, exchange and redemption information and other services" on page 99 of the Fund's statement of additional information ("SAI"). Different intermediaries and financial professionals may make available different sales charge waivers or discounts. These variations are described in Appendix A on page A-1 of the prospectus (Intermediary-Specific Sales Charge Waivers and Discounts).
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 Oct. 29, 2018
Portfolio Turnover [Heading] rr_PortfolioTurnoverHeading Portfolio turnover
Portfolio Turnover [Text Block] rr_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 78% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 78.00%
Expense Breakpoint Discounts [Text] rr_ExpenseBreakpointDiscounts 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.
Expense Breakpoint, Minimum Investment Required [Amount] rr_ExpenseBreakpointMinimumInvestmentRequiredAmount $ 50,000
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 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:
Strategy [Heading] rr_StrategyHeading Principal strategies
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock

Principal investments


To achieve its investment objective, the Fund invests in, or seeks exposure to companies based on various financial factors and fundamental sustainability factors such as environmental, social and governance performance of such companies.


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 companies. Investments in equity securities may include, but are not limited to, dividend-paying securities, common stock, preferred stock, shares of investment companies, convertible securities, warrants and rights.


The Fund may, but is not required to, use exchange-traded derivative instruments for risk management purposes or as part of the Fund's investment strategies. Generally, derivatives are financial contracts whose value depends upon, or is derived from, the value of an underlying asset, reference rate, index or other market factor and may relate to stocks, bonds, interest rates, credit, currencies or currency exchange rates, commodities and related indexes. 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.


Management process


The Advisor's investment decisions are based upon price/value discrepancies as identified by the Advisor's fundamental valuation process. In selecting securities, the Advisor focuses on, among other things, identifying discrepancies between a security's fundamental value and its market price. In this context, the fundamental value of a given security is the Advisor's assessment of what a security is worth. The Advisor will select a security whose fundamental value it estimates to be greater than its market value at any given time. For each stock under analysis, the Advisor bases its estimates of value upon economic, industry and company analysis, as well as upon a company's management team, competitive advantage and core competencies. The Advisor then compares its assessment of a security's value against the prevailing market prices, with the aim of constructing a portfolio of stocks with attractive relative price/value characteristics.


The Advisor will employ both a positive and negative screening process in selecting securities for the Fund. The positive screening process will identify securities of companies that are fundamentally attractive and that have superior valuation characteristics. In addition, the positive screening process will also include material, fundamental sustainability factors that the Advisor believes confirm the fundamental investment case and can enhance the ability to make good investment decisions. The sustainability factors are material extra-financial factors that evaluate the environmental, social and governance performance of companies that, along with more traditional financial analytics, identify companies that the Advisor believes will provide sustained, long-term value. The Advisor believes that the sustainability strategy provides the Fund with a high quality portfolio and mitigates risk.


The Advisor also applies a negative screening process that will exclude from the Fund's portfolio securities with more than 5% of sales in industries such as alcohol, tobacco, defense, nuclear, GMO (Genetically Modified Organisms), gambling and pornography. The Advisor may modify this list of negative screens at any time, without prior shareholder approval or notice.
Risk [Heading] rr_RiskHeading Main 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 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.


Small- and mid-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.


Sustainability factor risk: The Fund's sustainability factors used in its investment process will likely make the Fund perform differently from a fund that relies solely or primarily on financial metrics. The sustainability factors may cause the Fund's industry allocation to deviate from that of funds without these considerations.


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. 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 risk, management risk, counterparty risk (which is the risk that a counterparty to a derivative contract is unable or unwilling to meet its financial obligations) and the risk that changes in the value of a derivative may not correlate perfectly with the underlying asset, rate, index or overall market securities. 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.


Focused investment risk: The risk that investing in a select group of securities could subject the Fund to greater risk of loss and could be considerably more volatile than the Fund's primary benchmark or other mutual funds that are diversified across a greater number of securities.


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 Money [Text] rr_RiskLoseMoney You may lose money by investing in the Fund.
Risk Not Insured Depository Institution [Text] rr_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 [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 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. Indices 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. On or about October 27, 2017, the Fund's investment strategies changed. The performance below for periods prior to that date is attributable to the Fund's performance before the strategy change. Updated performance for the Fund is available at www.ubs.com/us-mutualfundperformance.


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 P shares' after-tax returns shown.
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 and by showing how the Fund's average annual total returns compare with those of a broad measure of market performance.
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress www.ubs.com/us-mutualfundperformance
Performance Past Does Not Indicate Future [Text] rr_PerformancePastDoesNotIndicateFuture The Fund's past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future.
Bar Chart [Heading] rr_BarChartHeading Total return (Class P)
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock

Total return January 1 - September 30, 2017: 16.73%
Best quarter during calendar years shown—2Q 2009: 19.55%
Worst quarter during calendar years shown—4Q 2008: (26.34)%
Year to Date Return, Label rr_YearToDateReturnLabel Total return
Bar Chart, Year to Date Return, Date rr_BarChartYearToDateReturnDate Sep. 30, 2017
Bar Chart, Year to Date Return rr_BarChartYearToDateReturn 16.73%
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Best quarter
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Jun. 30, 2009
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 19.55%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Worst quarter
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Dec. 31, 2008
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (26.34%)
Performance Table Market Index Changed rr_PerformanceTableMarketIndexChanged Effective October 27, 2017, the S&P 500 Index replaced the Russell 1000 Index as the Fund's primary benchmark because it more closely aligns with the Fund's investment strategy.
Index No Deduction for Fees, Expenses, Taxes [Text] rr_IndexNoDeductionForFeesExpensesTaxes Indices reflects no deduction for fees, expenses or taxes.
Performance Table Uses Highest Federal Rate rr_PerformanceTableUsesHighestFederalRate 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.
Performance Table Not Relevant to Tax Deferred rr_PerformanceTableNotRelevantToTaxDeferred 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.
Performance Table One Class of after Tax Shown [Text] rr_PerformanceTableOneClassOfAfterTaxShown After-tax returns for other classes will vary from the Class P shares' after-tax returns shown.
Caption rr_AverageAnnualReturnCaption Average annual total returns (figures reflect sales charges) (for the periods ended December 31, 2016)
UBS U.S. Sustainable Equity Fund | S&P 500 Index1  
Risk/Return: rr_RiskReturnAbstract  
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 11.96% [1]
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 14.66% [1]
Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10 6.95% [1]
UBS U.S. Sustainable Equity Fund | Russell 1000 Index1  
Risk/Return: rr_RiskReturnAbstract  
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 12.05% [1]
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 14.69% [1]
Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10 7.08% [1]
UBS U.S. Sustainable Equity Fund | Class A  
Risk/Return: rr_RiskReturnAbstract  
Maximum front-end sales charge (load) imposed on purchases (as a % of offering price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice 5.50%
Maximum contingent deferred sales charge (load) (CDSC) (as a % of purchase or sales price, whichever is less) rr_MaximumDeferredSalesChargeOverOther none [2]
Management fees rr_ManagementFeesOverAssets 0.70%
Distribution and/or service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Other expenses rr_OtherExpensesOverAssets 1.09% [3]
Total annual fund operating expenses rr_ExpensesOverAssets 2.04%
Less management fee waiver/expense reimbursements rr_FeeWaiverOrReimbursementOverAssets 1.09%
Total annual fund operating expenses after management fee waiver/expense reimbursements rr_NetExpensesOverAssets 0.95% [4]
Expenses Deferred Charges [Text Block] rr_ExpensesDeferredChargesTextBlock Purchases of $1 million or more that were not subject to a front-end sales charge are subject to a 1% CDSC if sold within one year of the purchase date.
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 642
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 1,055
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 1,493
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 2,706
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 4.79%
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 12.68%
Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10 4.63%
Average Annual Returns, Inception Date rr_AverageAnnualReturnInceptionDate Jun. 30, 1997
UBS U.S. Sustainable Equity Fund | Class A | After Taxes on Distributions  
Risk/Return: rr_RiskReturnAbstract  
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 10.80%
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 13.95%
Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10 5.10%
UBS U.S. Sustainable Equity Fund | Class A | After Taxes on Distributions and Sale of Fund Shares  
Risk/Return: rr_RiskReturnAbstract  
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 6.56%
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 11.44%
Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10 4.33%
UBS U.S. Sustainable Equity 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_MaximumDeferredSalesChargeOverOther 1.00%
Management fees rr_ManagementFeesOverAssets 0.70%
Distribution and/or service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets 1.00%
Other expenses rr_OtherExpensesOverAssets 1.11% [3]
Total annual fund operating expenses rr_ExpensesOverAssets 2.81%
Less management fee waiver/expense reimbursements rr_FeeWaiverOrReimbursementOverAssets 1.11%
Total annual fund operating expenses after management fee waiver/expense reimbursements rr_NetExpensesOverAssets 1.70% [4]
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 273
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 766
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 1,386
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 3,057
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 173
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 766
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 1,386
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 3,057
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 9.07%
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 13.11%
Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10 4.44%
Average Annual Returns, Inception Date rr_AverageAnnualReturnInceptionDate Nov. 13, 2001
UBS U.S. Sustainable Equity Fund | CLASS P  
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_MaximumDeferredSalesChargeOverOther none
Management fees rr_ManagementFeesOverAssets 0.70%
Distribution and/or service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets none
Other expenses rr_OtherExpensesOverAssets 1.06% [3]
Total annual fund operating expenses rr_ExpensesOverAssets 1.76%
Less management fee waiver/expense reimbursements rr_FeeWaiverOrReimbursementOverAssets 1.06%
Total annual fund operating expenses after management fee waiver/expense reimbursements rr_NetExpensesOverAssets 0.70% [4]
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 72
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 451
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 855
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,985
Annual Return 2007 rr_AnnualReturn2007 1.02%
Annual Return 2008 rr_AnnualReturn2008 (40.28%)
Annual Return 2009 rr_AnnualReturn2009 32.07%
Annual Return 2010 rr_AnnualReturn2010 13.39%
Annual Return 2011 rr_AnnualReturn2011 (2.83%)
Annual Return 2012 rr_AnnualReturn2012 13.05%
Annual Return 2013 rr_AnnualReturn2013 35.62%
Annual Return 2014 rr_AnnualReturn2014 15.13%
Annual Return 2015 rr_AnnualReturn2015 (0.83%)
Annual Return 2016 rr_AnnualReturn2016 11.12%
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 11.12%
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 14.23%
Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10 5.50%
Average Annual Returns, Inception Date rr_AverageAnnualReturnInceptionDate Feb. 22, 1994
[1] Effective October 27, 2017, the S&P 500 Index replaced the Russell 1000 Index as the Fund's primary benchmark because it more closely aligns with the Fund's investment strategy.
[2] Purchases of $1 million or more that were not subject to a front-end sales charge are subject to a 1% CDSC if sold within one year of the purchase date.
[3] "Other expenses" include "Acquired fund fees and expenses," which were less than 0.01% of the average net assets of the Fund.
[4] The Trust, with respect to the Fund, and UBS Asset Management (Americas) Inc., the Fund's investment advisor ("UBS 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 and extraordinary expenses) 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 and extraordinary expenses), through the period ending October 29, 2018, do not exceed 0.95% for Class A shares, 1.70% for Class C shares and 0.70% for Class P shares. Pursuant to the written agreement, the Advisor is entitled to be reimbursed for any fees it waives and expenses it reimburses to the extent such reimbursement can be made during the three years following the date on which such fee waivers and expense reimbursements were made, provided that the reimbursement of the Advisor by the Fund will not cause the Fund to exceed the lesser of any applicable expense limit that is in place for the Fund (i) at the time of the waiver or reimbursement, or (ii) at the time of the recoupment. The fee waiver/expense reimbursement agreement may be terminated by the Fund's Board of Trustees at any time and also will terminate automatically upon the expiration or termination of the Fund's advisory contract with the Advisor. Upon termination of the fee waiver/expense reimbursement agreement, however, UBS AM (Americas)'s three year recoupment rights will survive.