485BPOS

As filed with the U.S. Securities and Exchange Commission on November 19, 2012

File No. 033-47287

File No. 811-06637

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, D.C.  20549

FORM N-1A

REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933	x
Pre-Effective Amendment No.	o
Post-Effective Amendment No. 106	x
and/or
REGISTRATION STATEMENT UNDER THE INVESTMENT COMPANY ACT OF 1940	x
Amendment No. 107

(Check appropriate box or boxes.)

THE UBS FUNDS

(Exact Name of Registrant as Specified in Charter)

One North Wacker, Chicago, Illinois 60606

(Address of Principal Executive Office) (Zip Code)

Registrant’s Telephone Number, including Area Code   312-525-7100

Mark F. Kemper

UBS Global Asset Management

One North Wacker

Chicago, Illinois  60606

(Name and Address of Agent for Service)

Please send copies of all communications to:

Bruce G. Leto, Esq.

Stradley, Ronon, Stevens & Young, LLP

2600 One Commerce Square

Philadelphia, PA 19103

(215) 564-8027

Approximate Date of Proposed Public Offering: As soon as practicable after the effective date of this registration statement.

It is proposed that this filing will become effective (check appropriate box):

x immediately upon filing pursuant to paragraph (b)

o on [Date] pursuant to paragraph (b)

o 60 days after filing pursuant to paragraph (a)(1)

o on [Date] pursuant to paragraph (a)(1)

o 75 days after filing pursuant to paragraph (a)(2)

o on [Date] pursuant to paragraph (a)(2) of Rule 485.

If appropriate, check the following box:

o This post-effective amendment designates a new effective date for a previously filed post-effective amendment.

SIGNATURES

Pursuant to the requirements of the Securities Act of 1933, as amended (the “Securities Act”) and the Investment Company Act of 1940, as amended, the Registrant certifies that it meets all of the requirements for effectiveness of this Registration Statement under Rule 485(b) under the Securities Act and has duly caused Post-Effective Amendment Nos. 106/107 to this registration statement to be signed on its behalf by the undersigned, duly authorized, in the City of New York, and the State of New York on the 19th day of November, 2012.

THE UBS FUNDS
By:	/s/ Mark E. Carver
	Mark E. Carver*
	President and Principal Executive Officer

Pursuant to the requirements of the Securities Act, this Registration Statement has been signed below by the following persons in the capacities and on the dates indicated:

Signature	Title	Date
/s/ Mark E. Carver	President and Principal	November 19, 2012
Mark E. Carver*	Executive Officer
/s/ Frank K. Reilly	Chairman and	November 19, 2012
Frank K. Reilly*	Trustee
/s/ Shawn Lytle	Trustee	November 19, 2012
Shawn Lytle*
/s/ Edward M. Roob	Trustee	November 19, 2012
Edward M. Roob*
/s/ Adela Cepeda	Trustee	November 19, 2012
Adela Cepeda*
/s/ J. Mikesell Thomas	Trustee	November 19, 2012
J. Mikesell Thomas*
/s/ Abbie J. Smith	Trustee	November 19, 2012
Abbie J. Smith*
/s/ John J. Murphy	Trustee	November 19, 2012
John J. Murphy*
/s/ Thomas Disbrow	Treasurer and Principal	November 19, 2012
Thomas Disbrow*	Accounting Officer

* By:	/s/ Tammie Lee
	Tammie Lee, Attorney-in-Fact
	(Pursuant to Powers of Attorney incorporated herein by reference.)

EXHIBIT INDEX

Index No.	Description of Exhibit
EX-101.INS	XBRL Instance Document
EX-101.SCH	XBRL Taxonomy Extension Schema Document
EX-101.CAL	XBRL Taxonomy Extension Calculation Linkbase
EX-101.DEF	XBRL Taxonomy Extension Definition Linkbase
EX-101.LAB	XBRL Taxonomy Extension Labels Linkbase
EX-101.PRE	XBRL Taxonomy Extension Presentation Linkbase

XML

Label	Element	Value
Risk Return [Abstract]	rr_RiskReturnAbstract
ProspectusDate	rr_ProspectusDate	Oct. 29, 2012
UBS Equity Long-Short Multi-Strategy Fund (Prospectus Summary) | UBS Equity Long-Short Multi-Strategy Fund
Risk Return [Abstract]	rr_RiskReturnAbstract
Risk/Return [Heading]	rr_RiskReturnHeading	UBS Equity Long-Short Multi-Strategy Fund (formerly, UBS Market Neutral Multi-Strategy Fund)
Objective [Heading]	rr_ObjectiveHeading	Investment objective
Objective, Primary [Text Block]	rr_ObjectivePrimaryTextBlock	The Fund seeks to preserve and grow capital with low correlation to the equity markets.
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 37 of the Fund's prospectus and in "Reduced sales charges, additional purchase, exchange and redemption information and other services" on page 107 of the Fund's statement of additional information ("SAI").
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)
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 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 242% of the average value of its portfolio.
Portfolio Turnover, Rate	rr_PortfolioTurnoverRate	242.00%
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 Under normal circumstances, the Fund invests at least 80% of its net assets (plus borrowings for investment purposes, if any) in equity and/or equity-related instruments. Equity-related instruments include securities or other instruments that derive their value from equity securities and may include such instruments as short sales of equity securities, swaps on equity securities, and futures and options on equity securities. Investments by the Fund in equity securities may include, but are not limited to, common stock and preferred stock of issuers in developed countries (including the United States) and emerging markets. The Fund's equity investments may include large, intermediate and small capitalization companies. The Fund will maintain both long positions and short positions in equity securities and securities with equity-like characteristics. The Fund also may invest in securities convertible into equity 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 options, futures, forward agreements, swap agreements (specifically, total return and currency swaps), equity participation notes and equity linked notes. All of these derivatives may be used for risk management purposes, such as hedging against a specific security or currency, or to manage or adjust the risk profile of the Fund. In addition, all of the derivative instruments listed above may be used for investment (non-hedging) purposes to earn income; to enhance returns; to replace more traditional direct investments; to obtain exposure to certain markets; or to establish net short positions for individual markets, currencies or securities. Under certain market conditions, the Fund may invest in companies at the time of their initial public offering ("IPO"). To the extent permitted by the Investment Company Act of 1940, as amended (the "1940 Act"), the Fund may borrow money from banks to purchase investments for the Fund. Management process The Fund seeks to maximize total returns by allocating its assets among one or more distinct equity investment strategies (each a "Fund component" and together, the "Fund components"), which are managed by portfolio management teams at the Advisor. Each Fund component is unique in terms of the source of its investment insight, its geographic focus, or both. A Fund component will purchase securities long that it believes will outperform the market, other Fund securities or both, and sell securities short that are expected to underperform the market, other Fund securities or both. The Fund engages in its long/short strategies in order to generate returns with low correlations to equity markets. The Advisor selects Fund components and allocates the Fund's assets among the Fund components based on each Fund component's expected contribution to the risk adjusted investment return of the Fund. Fund components are chosen by the Advisor in part because the Fund components demonstrate a low correlation of returns versus equity markets and among each other. The Advisor intends to allocate assets among the Fund components with the goal of providing returns for the Fund that are a function of the Advisor's stock-level investment insights rather than a function of broad market movements. In deciding the Fund's allocation to each Fund component, the Advisor utilizes analytical tools that enable the Advisor to view the entire investment portfolio of the Fund across all underlying components in order to best assess the allocation of Fund assets among these components based on alpha potential and contribution to volatility and to monitor the impact of individual stock positions, both long and short positions, on the Fund's entire portfolio. The Fund components utilize fundamental valuation, quantitative research or a combination of both to construct a portfolio. The investment decisions for certain Fund components are based on price/value discrepancies as identified by the Advisor's fundamental valuation process. In selecting securities utilizing the fundamental valuation process, 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 investment decisions for other Fund components are based on investment opportunities generated by quantitative research techniques that systematically exploit market anomalies to provide consistent excess returns for the Fund. The Fund's expected net equity market exposure (long market value - short market value) will typically range from 10% to 50%; however, in response to market conditions the Fund may adjust its net equity market exposure. The Fund's net equity market exposure may range from -25% to +75% and at the same time will comply with all leverage restrictions required by Section 18 of the 1940 Act and subsequent determinations of the SEC and any other regulatory limitations. The Fund may hold a substantial portion of its total assets in cash when the Fund maintains a net short equity market position. By taking both long and short positions, the Fund seeks to provide some protection in down markets when compared to a fund that takes only long positions.
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. Management risk: The risk that the investment strategies, techniques and risk analyses employed by the Advisor may not produce the desired results. Short sales risk: There are certain unique risks associated with the use of short sales strategies. When selling a security short, the Advisor will sell a security it does not own at the then-current market price and then borrow the security to deliver to the buyer. The Fund is then obligated to buy the security on a later date so it can return the security to the lender. Short sales therefore involve the risk that the Fund will incur a loss by subsequently buying a security at a higher price than the price at which the Fund previously sold the security short. This would occur if the securities lender required the Fund to deliver the securities the Fund had borrowed at the commencement of the short sale and the Fund was unable to either purchase the security at a favorable price or to borrow the security from another securities lender. If this occurs at a time when other short sellers of the security also want to close out their positions, a "short squeeze" can occur. A short squeeze occurs when demand is greater than supply for the security sold short. Moreover, because a Fund's loss on a short sale arises from increases in the value of the security sold short, such loss, like the price of the security sold short, is theoretically unlimited. By contrast, a Fund's loss on a long position arises from decreases in the value of the security and therefore is limited by the fact that a security's value cannot drop below zero. It is possible that the Fund's securities held long will decline in value at the same time that the value of the securities sold short increases, thereby increasing the potential for loss. 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. These risks are greater for investments in emerging market issuers. In addition, investments in emerging market issuers may decline in value because of unfavorable foreign government actions, greater risks of political instability or the absence of accurate information about emerging market issuers. Multi-strategy risk: The risk that the Fund may allocate assets to a Fund component that underperforms other strategy types. Market risk: The risk that 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.    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, many types of swaps and other 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. Leverage risk associated with borrowing: The Fund may borrow money from banks to purchase investments for the Fund, which is a form of leverage. If the Fund borrows money to purchase securities and the Fund's investments decrease in value, the Fund's losses will be greater than if the Fund did not borrow money for investment purposes. In addition, if the return on an investment purchased with borrowed funds is not sufficient to cover the cost of borrowing, then the net income of the Fund would be less than if borrowing were not used. 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. 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.
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. Below are some of the specific risks of investing in the Fund.
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 the Fund's performance for the year 2011 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. On September 5, 2012 the Fund's investment strategy changed. The performance information below, prior to that date, is attributable to the Fund's previous investment strategy. 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 Returns [Text]	rr_PerformanceInformationIllustratesVariabilityOfReturns	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 the Fund's performance for the year 2011 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	http://globalam-us.ubs.com/corpweb/performance.do
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	UBS Equity Long-Short Multi-Strategy Fund Annual Total Returns of Class Y Shares (2011 is Fund's first full year of operations)
Bar Chart Closing [Text Block]	rr_BarChartClosingTextBlock	Total return January 1 - September 30, 2012: (3.12)% Best quarter during calendar year shown-4Q 2011: (0.15)% Worst quarter during calendar year shown-3Q 2011: (0.82)%
Index No Deduction for Fees, Expenses, Taxes [Text]	rr_IndexNoDeductionForFeesExpensesTaxes	Index 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	In addition, the after-tax returns shown are not relevant to investors who old 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 Y shares' after-tax returns shown.
Caption	rr_AverageAnnualReturnCaption	Average annual total returns (for the periods ended December 31, 2011)
UBS Equity Long-Short Multi-Strategy Fund (Prospectus Summary) | UBS Equity Long-Short Multi-Strategy Fund | Citigroup Three-Month US Treasury Bill Index
Risk Return [Abstract]	rr_RiskReturnAbstract
Label	rr_AverageAnnualReturnLabel	Citigroup Three-Month US Treasury Bill Index
1 Year	rr_AverageAnnualReturnYear01	0.08%
Since Inception	rr_AverageAnnualReturnSinceInception	0.10%
UBS Equity Long-Short Multi-Strategy Fund (Prospectus Summary) | UBS Equity Long-Short Multi-Strategy Fund | Class A
Risk Return [Abstract]	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_MaximumDeferredSalesChargeOverOfferingPrice	none	[1]
Redemption fee (as a % of amount redeemed within 90 days of purchase, if applicable)	rr_RedemptionFeeOverRedemption	(1.00%)
Management fees	rr_ManagementFeesOverAssets	1.25%
Distribution and/or service (12b-1) fees	rr_DistributionAndService12b1FeesOverAssets	0.25%
Dividend expense and security loan fees for securities sold short	rr_Component1OtherExpensesOverAssets	1.50%	[2]
Other	rr_Component2OtherExpensesOverAssets	1.76%
Total other expenses	rr_OtherExpensesOverAssets	3.26%
Acquired fund fees and expenses	rr_AcquiredFundFeesAndExpensesOverAssets	0.01%	[2]
Total annual fund operating expenses	rr_ExpensesOverAssets	4.77%	[2],[3]
Less management fee waiver/expense reimbursements	rr_FeeWaiverOrReimbursementOverAssets	(1.51%)
Total annual fund operating expenses after management fee waiver/expense reimbursements	rr_NetExpensesOverAssets	3.26%	[2],[3],[4]
Fee Waiver or Reimbursement over Assets, Date of Termination	rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination	2013-10-28
Expense Example, with Redemption, 1 Year	rr_ExpenseExampleYear01	861
Expense Example, with Redemption, 3 Years	rr_ExpenseExampleYear03	1,780
Expense Example, with Redemption, 5 Years	rr_ExpenseExampleYear05	2,704
Expense Example, with Redemption, 10 Years	rr_ExpenseExampleYear10	5,031
Label	rr_AverageAnnualReturnLabel	Class A Return before taxes
1 Year	rr_AverageAnnualReturnYear01	(7.91%)
Since Inception	rr_AverageAnnualReturnSinceInception	(6.29%)
Inception Date	rr_AverageAnnualReturnInceptionDate	Jun. 30, 2010
UBS Equity Long-Short Multi-Strategy Fund (Prospectus Summary) | UBS Equity Long-Short Multi-Strategy Fund | Class C
Risk Return [Abstract]	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	1.00%
Redemption fee (as a % of amount redeemed within 90 days of purchase, if applicable)	rr_RedemptionFeeOverRedemption	(1.00%)
Management fees	rr_ManagementFeesOverAssets	1.25%
Distribution and/or service (12b-1) fees	rr_DistributionAndService12b1FeesOverAssets	1.00%
Dividend expense and security loan fees for securities sold short	rr_Component1OtherExpensesOverAssets	1.50%	[2]
Other	rr_Component2OtherExpensesOverAssets	1.67%
Total other expenses	rr_OtherExpensesOverAssets	3.17%
Acquired fund fees and expenses	rr_AcquiredFundFeesAndExpensesOverAssets	0.01%	[2]
Total annual fund operating expenses	rr_ExpensesOverAssets	5.43%	[2],[3]
Less management fee waiver/expense reimbursements	rr_FeeWaiverOrReimbursementOverAssets	(1.42%)
Total annual fund operating expenses after management fee waiver/expense reimbursements	rr_NetExpensesOverAssets	4.01%	[2],[3],[4]
Fee Waiver or Reimbursement over Assets, Date of Termination	rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination	2013-10-28
Expense Example, with Redemption, 1 Year	rr_ExpenseExampleYear01	503
Expense Example, with Redemption, 3 Years	rr_ExpenseExampleYear03	1,495
Expense Example, with Redemption, 5 Years	rr_ExpenseExampleYear05	2,578
Expense Example, with Redemption, 10 Years	rr_ExpenseExampleYear10	5,244
Expense Example, No Redemption, 1 Year	rr_ExpenseExampleNoRedemptionYear01	403
Expense Example, No Redemption, 3 Years	rr_ExpenseExampleNoRedemptionYear03	1,495
Expense Example, No Redemption, 5 Years	rr_ExpenseExampleNoRedemptionYear05	2,578
Expense Example, No Redemption, 10 Years	rr_ExpenseExampleNoRedemptionYear10	5,244
Label	rr_AverageAnnualReturnLabel	Class C Return before taxes
1 Year	rr_AverageAnnualReturnYear01	(4.27%)
Since Inception	rr_AverageAnnualReturnSinceInception	(3.38%)
Inception Date	rr_AverageAnnualReturnInceptionDate	Jun. 30, 2010
UBS Equity Long-Short Multi-Strategy Fund (Prospectus Summary) | UBS Equity Long-Short Multi-Strategy Fund | Class Y
Risk Return [Abstract]	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 fees	rr_ManagementFeesOverAssets	1.25%
Distribution and/or service (12b-1) fees	rr_DistributionAndService12b1FeesOverAssets	none
Dividend expense and security loan fees for securities sold short	rr_Component1OtherExpensesOverAssets	1.50%	[2]
Other	rr_Component2OtherExpensesOverAssets	1.50%
Total other expenses	rr_OtherExpensesOverAssets	3.00%
Acquired fund fees and expenses	rr_AcquiredFundFeesAndExpensesOverAssets	0.01%	[2]
Total annual fund operating expenses	rr_ExpensesOverAssets	4.26%	[2],[3]
Less management fee waiver/expense reimbursements	rr_FeeWaiverOrReimbursementOverAssets	(1.25%)
Total annual fund operating expenses after management fee waiver/expense reimbursements	rr_NetExpensesOverAssets	3.01%	[2],[3],[4]
Fee Waiver or Reimbursement over Assets, Date of Termination	rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination	2013-10-28
Expense Example, with Redemption, 1 Year	rr_ExpenseExampleYear01	304
Expense Example, with Redemption, 3 Years	rr_ExpenseExampleYear03	1,179
Expense Example, with Redemption, 5 Years	rr_ExpenseExampleYear05	2,068
Expense Example, with Redemption, 10 Years	rr_ExpenseExampleYear10	4,347
Annual Return 2011	rr_AnnualReturn2011	(2.38%)
Year to Date Return, Label	rr_YearToDateReturnLabel	Total return January 1 - September 30, 2012:
Bar Chart, Year to Date Return, Date	rr_BarChartYearToDateReturnDate	Sep. 30, 2012
Bar Chart, Year to Date Return	rr_BarChartYearToDateReturn	(3.12%)
Highest Quarterly Return, Label	rr_HighestQuarterlyReturnLabel	Best quarter during calendar year shown-4Q 2011:
Highest Quarterly Return, Date	rr_BarChartHighestQuarterlyReturnDate	Dec. 31, 2011
Highest Quarterly Return	rr_BarChartHighestQuarterlyReturn	(0.15%)
Lowest Quarterly Return, Label	rr_LowestQuarterlyReturnLabel	Worst quarter during calendar year shown-3Q 2011:
Lowest Quarterly Return, Date	rr_BarChartLowestQuarterlyReturnDate	Sep. 30, 2001
Lowest Quarterly Return	rr_BarChartLowestQuarterlyReturn	(0.82%)
Label	rr_AverageAnnualReturnLabel	Class Y Return before taxes
1 Year	rr_AverageAnnualReturnYear01	(2.38%)
Since Inception	rr_AverageAnnualReturnSinceInception	(2.44%)
Inception Date	rr_AverageAnnualReturnInceptionDate	Jun. 30, 2010
UBS Equity Long-Short Multi-Strategy Fund (Prospectus Summary) | UBS Equity Long-Short Multi-Strategy Fund | Class Y | After Taxes on Distributions
Risk Return [Abstract]	rr_RiskReturnAbstract
Label	rr_AverageAnnualReturnLabel	Class Y Return after taxes on distributions
1 Year	rr_AverageAnnualReturnYear01	(2.38%)
Since Inception	rr_AverageAnnualReturnSinceInception	(2.44%)
Inception Date	rr_AverageAnnualReturnInceptionDate	Jun. 30, 2010
UBS Equity Long-Short Multi-Strategy Fund (Prospectus Summary) | UBS Equity Long-Short Multi-Strategy Fund | Class Y | After Taxes on Distributions and Sales
Risk Return [Abstract]	rr_RiskReturnAbstract
Label	rr_AverageAnnualReturnLabel	Class Y Return after taxes on distributions and sale of fund shares
1 Year	rr_AverageAnnualReturnYear01	(1.53%)
Since Inception	rr_AverageAnnualReturnSinceInception	(2.07%)
Inception Date	rr_AverageAnnualReturnInceptionDate	Jun. 30, 2010

[1] 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.

[2] Due to the Fund's strategy change, the Fund has restated the "Dividend expense and security loan fees for securities sold short" and "Acquired fund fees and expenses" based on the anticipated expenses for the new strategy. These "Dividend expense and security loan fees for securities sold short" and "Acquired fund fees and expenses" are based on estimates and may vary based on actual investments. The actual "Dividend expense and security loan fees for securities sold short" for the Fund's fiscal year ended June 30, 2012 were 2.50% for Class A shares, 2.55% for Class C shares and 2.58% for Class Y shares. The actual "Acquired fund fees and expenses" for the Fund's fiscal year ended June 30, 2012 were 0.04% for Class A shares, 0.04% for Class C shares and 0.04% for Class Y shares. The actual "Total annual fund operating expenses" for the Fund's fiscal year ended June 30, 2012 were 5.80% for Class A shares, 6.51% for Class C shares and 5.37% for Class Y shares. The actual "Total annual fund operating expenses after management fee waiver/expense reimbursements" for the Fund's fiscal year ended June 30, 2012 were 4.29% for Class A shares, 5.08% for Class C shares and 4.12% for Class Y shares.

[3] 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.

[4] 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, and 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, and dividend expense and security loan fees for securities sold short), through the period ending October 28, 2013, do not exceed 1.75% for Class A shares, 2.50% for Class C shares and 1.50% 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. 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, the UBS Global AM (Americas)'s three year recoupment rights will survive.

XML

UBS U.S. Equity Opportunity Fund (Prospectus Summary) | UBS U.S. Equity Opportunity Fund

UBS U.S. Equity Opportunity Fund

Investment objective

The Fund seeks to maximize total return, consisting of capital appreciation and
current income.

Fees and expenses

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 37 of the Fund's
prospectus and in "Reduced sales charges, additional purchase, exchange and
redemption information and other services" on page 100 of the Fund's statement
of additional information ("SAI").

Shareholder fees (fees paid directly from your investment)

Shareholder Fees UBS U.S. Equity Opportunity Fund	Class A		Class C	Class Y
Maximum front-end sales charge (load) imposed on purchases (as a % of offering price)	5.50%		none	none
Maximum contingent deferred sales charge (load) (CDSC) (as a % of purchase or sales price, whichever is less)	none	[1]	1.00%	none
Redemption fee (as a % of amount redeemed within 90 days of purchase, if applicable)	1.00%		1.00%	1.00%

Annual fund operating expenses (expenses that you pay each year as a percentage of the value of your investment)

Annual Fund Operating Expenses UBS U.S. Equity Opportunity Fund		Class A	Class C	Class Y
Management fees		0.70%	0.70%	0.70%
Distribution and/or service (12b-1) fees		0.25%	1.00%	none
Other expenses		0.94%	0.97%	1.03%
Acquired fund fees and expenses		0.01%	0.01%	0.01%
Total annual fund operating expenses	[1]	1.90%	2.68%	1.74%
Less management fee waiver/expense reimbursements		0.69%	0.72%	0.78%
Total annual fund operating expenses after management fee waiver/expense reimbursements	[1][2]	1.21%	1.96%	0.96%

Example

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:

Expense Example UBS U.S. Equity Opportunity Fund (USD $)	Expense Example, with Redemption, 1 Year	Expense Example, with Redemption, 3 Years	Expense Example, with Redemption, 5 Years	Expense Example, with Redemption, 10 Years
Class A	667	1,051	1,459	2,597
Class C	299	764	1,356	2,960
Class Y	98	472	871	1,987

Expense Example, No Redemption (USD $)	Expense Example, No Redemption, 1 Year	Expense Example, No Redemption, 3 Years	Expense Example, No Redemption, 5 Years	Expense Example, No Redemption, 10 Years
UBS U.S. Equity Opportunity Fund Class C	199	764	1,356	2,960

Portfolio turnover

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 138%
of the average value of its portfolio.

Principal strategies

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
companies. The Fund primarily invests in large capitalization companies, but may
invest in companies of any size. The Fund may invest up to 20% of its net assets
in securities of foreign companies in both developed and emerging markets.
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 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 on indices or currencies and foward currency agreements, which 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

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 Fund 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 focused portfolio of stocks with
attractive relative price/value characteristics. Although the Fund is a
diversified fund under the Investment Company Act of 1940, as amended (the "1940
Act") the Fund employs a focused investment strategy that may result in the Fund
investing in a lesser number of issuers than other equity mutual funds.

Main risks

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.

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

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. Investments in foreign government bonds involve special risks because
the Fund may have limited legal recourse in the event of default. Also, foreign
securities are sometimes less liquid and more difficult to sell and to value than
securities of US issuers. These risks are greater for investments in emerging
market issuers. In addition, investments in emerging market issuers may decline
in value because of unfavorable foreign government actions, greater risks of
political instability or the absence of accurate information about emerging market
issuers.

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.

Limited number of issuers risk: The Fund may invest in a limited number of
issuers compared to other mutual funds and, consequently, may invest a greater
portion of its assets in one or more issuers than other mutual funds. The Fund,
therefore, may be more sensitive to a single economic, business, political,
regulatory or other occurrence, which may result in greater fluctuation in the
value of the Fund's shares and to a greater risk of loss.

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.

Performance

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. On December 30, 2011, the Fund's
investment strategy, including its 80% policy, changed. The performance
information below, prior to that date, is attributable to the Fund's previous
investment strategy. 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.

UBS U.S. Equity Opportunity Fund Annual Total Returns of Class Y Shares

Total return January 1 - September 30, 2012: 14.17%
Best quarter during calendar years shown-2Q 2009: 19.76%
Worst quarter during calendar years shown-4Q 2008: (25.45)%

Average annual total returns (for the periods ended December 31, 2011)

Average Annual Total Returns UBS U.S. Equity Opportunity Fund	Label		1 Year	5 Years	10 Years	Inception Date
Class A	Class A Return before taxes		(11.22%)	(6.35%)	1.58%	Dec. 07, 2001
Class C	Class C Return before taxes	[1]	(7.61%)	(5.98%)	1.41%	Dec. 12, 2001
Class Y	Class Y Return before taxes		(5.94%)	(5.03%)	2.43%	Jun. 29, 2001
After Taxes on Distributions Class Y	Class Y Return after taxes on distributions		(6.14%)	(5.95%)	1.30%	Jun. 29, 2001
After Taxes on Distributions and Sales Class Y	Class Y Return after taxes on distributions and sale of fund shares		(3.61%)	(4.23%)	2.07%	Jun. 29, 2001
Russell 1000 Index	Russell 1000 Index		1.50%	(0.02%)	3.35%

[1] 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.

[1] 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.

[2] 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 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 28, 2013, do not exceed 1.20% for Class A shares, 1.95% for Class C shares and 0.95% 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. 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, the UBS Global AM (Americas)'s three year recoupment rights will survive.

[1] 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.

XML

Label	Element	Value
Risk Return [Abstract]	rr_RiskReturnAbstract
ProspectusDate	rr_ProspectusDate	Oct. 29, 2012
UBS U.S. Equity Opportunity Fund (Prospectus Summary) | UBS U.S. Equity Opportunity Fund
Risk Return [Abstract]	rr_RiskReturnAbstract
Risk/Return [Heading]	rr_RiskReturnHeading	UBS U.S. Equity Opportunity 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 37 of the Fund's prospectus and in "Reduced sales charges, additional purchase, exchange and redemption information and other services" on page 100 of the Fund's statement of additional information ("SAI").
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)
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 138% of the average value of its portfolio.
Portfolio Turnover, Rate	rr_PortfolioTurnoverRate	138.00%
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 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. The Fund primarily invests in large capitalization companies, but may invest in companies of any size. The Fund may invest up to 20% of its net assets in securities of foreign companies in both developed and emerging markets. 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 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 on indices or currencies and foward currency agreements, which 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 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 Fund 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 focused portfolio of stocks with attractive relative price/value characteristics. Although the Fund is a diversified fund under the Investment Company Act of 1940, as amended (the "1940 Act") the Fund employs a focused investment strategy that may result in the Fund investing in a lesser number of issuers than other equity mutual funds.
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. Management risk: The risk that the investment strategies, techniques and risk analyses employed by the Advisor may not produce the desired results. 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. Investments in foreign government bonds involve special risks because the Fund may have limited legal recourse in the event of default. Also, foreign securities are sometimes less liquid and more difficult to sell and to value than securities of US issuers. These risks are greater for investments in emerging market issuers. In addition, investments in emerging market issuers may decline in value because of unfavorable foreign government actions, greater risks of political instability or the absence of accurate information about emerging market issuers. 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. Limited number of issuers risk: The Fund may invest in a limited number of issuers compared to other mutual funds and, consequently, may invest a greater portion of its assets in one or more issuers than other mutual funds. The Fund, therefore, may be more sensitive to a single economic, business, political, regulatory or other occurrence, which may result in greater fluctuation in the value of the Fund's shares and to a greater risk of loss. 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.
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. 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. On December 30, 2011, the Fund's investment strategy, including its 80% policy, changed. The performance information below, prior to that date, is attributable to the Fund's previous investment strategy. 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 Returns [Text]	rr_PerformanceInformationIllustratesVariabilityOfReturns	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.
Performance Availability Website Address [Text]	rr_PerformanceAvailabilityWebSiteAddress	http://globalam-us.ubs.com/corpweb/performance.do
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	UBS U.S. Equity Opportunity Fund Annual Total Returns of Class Y Shares
Bar Chart Closing [Text Block]	rr_BarChartClosingTextBlock	Total return January 1 - September 30, 2012: 14.17% Best quarter during calendar years shown-2Q 2009: 19.76% Worst quarter during calendar years shown-4Q 2008: (25.45)%
Index No Deduction for Fees, Expenses, Taxes [Text]	rr_IndexNoDeductionForFeesExpensesTaxes	Index 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	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 Y shares' after-tax returns shown.
Caption	rr_AverageAnnualReturnCaption	Average annual total returns (for the periods ended December 31, 2011)
UBS U.S. Equity Opportunity Fund (Prospectus Summary) | UBS U.S. Equity Opportunity Fund | Russell 1000 Index
Risk Return [Abstract]	rr_RiskReturnAbstract
Label	rr_AverageAnnualReturnLabel	Russell 1000 Index
1 Year	rr_AverageAnnualReturnYear01	1.50%
5 Years	rr_AverageAnnualReturnYear05	(0.02%)
10 Years	rr_AverageAnnualReturnYear10	3.35%
UBS U.S. Equity Opportunity Fund (Prospectus Summary) | UBS U.S. Equity Opportunity Fund | Class A
Risk Return [Abstract]	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_MaximumDeferredSalesChargeOverOfferingPrice	none	[1]
Redemption fee (as a % of amount redeemed within 90 days of purchase, if applicable)	rr_RedemptionFeeOverRedemption	(1.00%)
Management fees	rr_ManagementFeesOverAssets	0.70%
Distribution and/or service (12b-1) fees	rr_DistributionAndService12b1FeesOverAssets	0.25%
Other expenses	rr_OtherExpensesOverAssets	0.94%
Acquired fund fees and expenses	rr_AcquiredFundFeesAndExpensesOverAssets	0.01%
Total annual fund operating expenses	rr_ExpensesOverAssets	1.90%	[2]
Less management fee waiver/expense reimbursements	rr_FeeWaiverOrReimbursementOverAssets	(0.69%)
Total annual fund operating expenses after management fee waiver/expense reimbursements	rr_NetExpensesOverAssets	1.21%	[2],[3]
Fee Waiver or Reimbursement over Assets, Date of Termination	rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination	2013-10-28
Expense Example, with Redemption, 1 Year	rr_ExpenseExampleYear01	667
Expense Example, with Redemption, 3 Years	rr_ExpenseExampleYear03	1,051
Expense Example, with Redemption, 5 Years	rr_ExpenseExampleYear05	1,459
Expense Example, with Redemption, 10 Years	rr_ExpenseExampleYear10	2,597
Label	rr_AverageAnnualReturnLabel	Class A Return before taxes
1 Year	rr_AverageAnnualReturnYear01	(11.22%)
5 Years	rr_AverageAnnualReturnYear05	(6.35%)
10 Years	rr_AverageAnnualReturnYear10	1.58%
Inception Date	rr_AverageAnnualReturnInceptionDate	Dec. 07, 2001
UBS U.S. Equity Opportunity Fund (Prospectus Summary) | UBS U.S. Equity Opportunity Fund | Class C
Risk Return [Abstract]	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	1.00%
Redemption fee (as a % of amount redeemed within 90 days of purchase, if applicable)	rr_RedemptionFeeOverRedemption	(1.00%)
Management fees	rr_ManagementFeesOverAssets	0.70%
Distribution and/or service (12b-1) fees	rr_DistributionAndService12b1FeesOverAssets	1.00%
Other expenses	rr_OtherExpensesOverAssets	0.97%
Acquired fund fees and expenses	rr_AcquiredFundFeesAndExpensesOverAssets	0.01%
Total annual fund operating expenses	rr_ExpensesOverAssets	2.68%	[2]
Less management fee waiver/expense reimbursements	rr_FeeWaiverOrReimbursementOverAssets	(0.72%)
Total annual fund operating expenses after management fee waiver/expense reimbursements	rr_NetExpensesOverAssets	1.96%	[2],[3]
Fee Waiver or Reimbursement over Assets, Date of Termination	rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination	2013-10-28
Expense Example, with Redemption, 1 Year	rr_ExpenseExampleYear01	299
Expense Example, with Redemption, 3 Years	rr_ExpenseExampleYear03	764
Expense Example, with Redemption, 5 Years	rr_ExpenseExampleYear05	1,356
Expense Example, with Redemption, 10 Years	rr_ExpenseExampleYear10	2,960
Expense Example, No Redemption, 1 Year	rr_ExpenseExampleNoRedemptionYear01	199
Expense Example, No Redemption, 3 Years	rr_ExpenseExampleNoRedemptionYear03	764
Expense Example, No Redemption, 5 Years	rr_ExpenseExampleNoRedemptionYear05	1,356
Expense Example, No Redemption, 10 Years	rr_ExpenseExampleNoRedemptionYear10	2,960
Label	rr_AverageAnnualReturnLabel	Class C Return before taxes	[4]
1 Year	rr_AverageAnnualReturnYear01	(7.61%)
5 Years	rr_AverageAnnualReturnYear05	(5.98%)
10 Years	rr_AverageAnnualReturnYear10	1.41%
Inception Date	rr_AverageAnnualReturnInceptionDate	Dec. 12, 2001
UBS U.S. Equity Opportunity Fund (Prospectus Summary) | UBS U.S. Equity Opportunity Fund | Class Y
Risk Return [Abstract]	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 fees	rr_ManagementFeesOverAssets	0.70%
Distribution and/or service (12b-1) fees	rr_DistributionAndService12b1FeesOverAssets	none
Other expenses	rr_OtherExpensesOverAssets	1.03%
Acquired fund fees and expenses	rr_AcquiredFundFeesAndExpensesOverAssets	0.01%
Total annual fund operating expenses	rr_ExpensesOverAssets	1.74%	[2]
Less management fee waiver/expense reimbursements	rr_FeeWaiverOrReimbursementOverAssets	(0.78%)
Total annual fund operating expenses after management fee waiver/expense reimbursements	rr_NetExpensesOverAssets	0.96%	[2],[3]
Fee Waiver or Reimbursement over Assets, Date of Termination	rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination	2013-10-28
Expense Example, with Redemption, 1 Year	rr_ExpenseExampleYear01	98
Expense Example, with Redemption, 3 Years	rr_ExpenseExampleYear03	472
Expense Example, with Redemption, 5 Years	rr_ExpenseExampleYear05	871
Expense Example, with Redemption, 10 Years	rr_ExpenseExampleYear10	1,987
Annual Return 2002	rr_AnnualReturn2002	(15.56%)
Annual Return 2003	rr_AnnualReturn2003	30.85%
Annual Return 2004	rr_AnnualReturn2004	14.25%
Annual Return 2005	rr_AnnualReturn2005	10.00%
Annual Return 2006	rr_AnnualReturn2006	18.57%
Annual Return 2007	rr_AnnualReturn2007	0.47%
Annual Return 2008	rr_AnnualReturn2008	(40.09%)
Annual Return 2009	rr_AnnualReturn2009	23.00%
Annual Return 2010	rr_AnnualReturn2010	10.92%
Annual Return 2011	rr_AnnualReturn2011	(5.94%)
Year to Date Return, Label	rr_YearToDateReturnLabel	Total return January 1 - September 30, 2012:
Bar Chart, Year to Date Return, Date	rr_BarChartYearToDateReturnDate	Sep. 30, 2012
Bar Chart, Year to Date Return	rr_BarChartYearToDateReturn	14.17%
Highest Quarterly Return, Label	rr_HighestQuarterlyReturnLabel	Best quarter during calendar years shown-2Q 2009:
Highest Quarterly Return, Date	rr_BarChartHighestQuarterlyReturnDate	Jun. 30, 2009
Highest Quarterly Return	rr_BarChartHighestQuarterlyReturn	19.76%
Lowest Quarterly Return, Label	rr_LowestQuarterlyReturnLabel	Worst quarter during calendar years shown-4Q 2008:
Lowest Quarterly Return, Date	rr_BarChartLowestQuarterlyReturnDate	Dec. 31, 2008
Lowest Quarterly Return	rr_BarChartLowestQuarterlyReturn	(25.45%)
Label	rr_AverageAnnualReturnLabel	Class Y Return before taxes
1 Year	rr_AverageAnnualReturnYear01	(5.94%)
5 Years	rr_AverageAnnualReturnYear05	(5.03%)
10 Years	rr_AverageAnnualReturnYear10	2.43%
Inception Date	rr_AverageAnnualReturnInceptionDate	Jun. 29, 2001
UBS U.S. Equity Opportunity Fund (Prospectus Summary) | UBS U.S. Equity Opportunity Fund | Class Y | After Taxes on Distributions
Risk Return [Abstract]	rr_RiskReturnAbstract
Label	rr_AverageAnnualReturnLabel	Class Y Return after taxes on distributions
1 Year	rr_AverageAnnualReturnYear01	(6.14%)
5 Years	rr_AverageAnnualReturnYear05	(5.95%)
10 Years	rr_AverageAnnualReturnYear10	1.30%
Inception Date	rr_AverageAnnualReturnInceptionDate	Jun. 29, 2001
UBS U.S. Equity Opportunity Fund (Prospectus Summary) | UBS U.S. Equity Opportunity Fund | Class Y | After Taxes on Distributions and Sales
Risk Return [Abstract]	rr_RiskReturnAbstract
Label	rr_AverageAnnualReturnLabel	Class Y Return after taxes on distributions and sale of fund shares
1 Year	rr_AverageAnnualReturnYear01	(3.61%)
5 Years	rr_AverageAnnualReturnYear05	(4.23%)
10 Years	rr_AverageAnnualReturnYear10	2.07%
Inception Date	rr_AverageAnnualReturnInceptionDate	Jun. 29, 2001

[1] 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.

[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 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 28, 2013, do not exceed 1.20% for Class A shares, 1.95% for Class C shares and 0.95% 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. 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, the UBS Global AM (Americas)'s three year recoupment rights will survive.

[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.

XML

Label	Element	Value
Risk Return [Abstract]	rr_RiskReturnAbstract
ProspectusDate	rr_ProspectusDate	Oct. 29, 2012
UBS Core Plus Bond Fund (Prospectus Summary) | UBS Core Plus Bond Fund
Risk Return [Abstract]	rr_RiskReturnAbstract
Risk/Return [Heading]	rr_RiskReturnHeading	UBS Core Plus Bond 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 $100,000 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 34 of the Fund's prospectus and in "Reduced sales charges, additional purchase, exchange and redemption information and other services" on page 107 of the Fund's statement of additional information ("SAI").
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)
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 509% of the average value of its portfolio.
Portfolio Turnover, Rate	rr_PortfolioTurnoverRate	509.00%
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 $100,000 in the Fund.
Expense Breakpoint, Minimum Investment Required [Amount]	rr_ExpenseBreakpointMinimumInvestmentRequiredAmount	100,000
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 Under normal circumstances, the Fund invests at least 80% of its net assets (plus borrowings for investment purposes, if any) in bonds, which are defined as fixed income securities. The Fund may invest in fixed income securities of any maturity, but generally invests in securities having an initial maturity of greater than one year. The Fund's investments in fixed income securities may include, but are not limited to, securities of the US government, its agencies and government-sponsored enterprises, securities guaranteed by the US government, corporate debt securities of US and non-US issuers, including convertible securities, obligations of non-US governments or their subdivisions, agencies and government-sponsored enterprises, obligations of international agencies or supranational entities, mortgage-backed and asset-backed securities. The Fund may invest up 35% of its net assets in foreign fixed income securities, with up to 30% of its net assets in fixed income securities denominated in foreign currencies. Under normal conditions, the Fund expects to limit foreign currency exposure to 20% of the Fund's net assets. The Fund generally invests in investment grade securities. However, the Fund may invest up to 30% of its net assets in any combination of high yield (lower-rated or "junk bonds") securities, emerging market fixed income securities or other non-investment grade securities, provided that no more than 15% of its net assets may be invested in developed market high yield securities and no more than 15% of its net assets may be invested in emerging market securities. Depending on its assessment of market conditions, the Advisor may choose to allocate the Fund's assets in any combination among these types of investments or may choose not to invest in these types of investments. 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 options (including, but not limited to, options on futures, forwards and swap agreements), futures, forward agreements, swap agreements (specifically, interest rate, total return, currency, credit default and inflation swaps), credit-linked securities and structured investments. All of these derivatives may be used for risk management purposes, such as hedging against a specific security or currency, or to manage or adjust the risk profile of the Fund. In addition, all of the derivative instruments listed above may be used for investment (non-hedging) purposes to earn income; to enhance returns; to replace more traditional direct investments; to obtain exposure to certain markets; to establish net short positions for individual sectors, markets, currencies or securities; or to adjust the Fund's portfolio duration. Management process The Advisor uses an investment style focused on investment fundamentals. The Advisor believes that investment fundamentals determine and define investment value. The Advisor seeks to identify and exploit periodic differences between market prices and fundamental value. In analyzing price/value differences, the Advisor also takes into account cyclical market drivers that may influence near term dynamics of market prices. The Advisor considers various factors and incorporates numerous tools to construct and manage investment portfolios. Through a combination of top-down macroeconomic analysis and forecasting and intensive bottom-up issuer-specific research, the Advisor makes active decisions related to duration, yield curve positioning, relative sector, issuer, and quality exposures. Both quantitative and qualitative analysis is employed to all facets of portfolio construction and management with a comprehensive focus on risk management in both absolute and benchmark-relative terms.
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. Interest rate risk: An increase in prevailing interest rates typically causes the value of fixed income securities to fall. Changes in interest rates will likely affect the value of longer-duration fixed income securities more than shorter-duration securities and higher quality securities more than lower quality securities. When interest rates are falling, some fixed income securities provide that the issuer may repay them earlier than the maturity date, and if this occurs the Fund may have to reinvest these repayments at lower interest rates. Credit risk: The risk that the Fund could lose money if the issuer or guarantor of a fixed income security, or the counterparty to or guarantor of a derivative contract, is unable or unwilling to meet its financial obligations. This risk is likely greater for lower quality investments than for investments that are higher quality. 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. High yield bond risk: The risk that the issuer of bonds with ratings of BB (Standard & Poor's Ratings Group ("S&P")) or Ba (Moody's Investors Service, Inc. ("Moody's")) or below, or deemed of equivalent quality, will default or otherwise be unable to honor a financial obligation (also known as lower-rated or "junk bonds"). These securities are considered to be predominately speculative with respect to an issuer's capacity to pay interest and repay principal in accordance with the terms of the obligations. Lower-quality bonds are more likely to be subject to an issuer's default or downgrade than investment grade (higher-quality) bonds. Market risk: The risk that 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. 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. Investments in foreign government bonds involve special risks because the Fund may have limited legal recourse in the event of default. Also, foreign securities are sometimes less liquid and more difficult to sell and to value than securities of US issuers. These risks are greater for investments in emerging market issuers. In addition, investments in emerging market issuers may decline in value because of unfavorable foreign government actions, greater risks of political instability or the absence of accurate information about emerging market issuers. 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. Derivatives relating to fixed income markets are especially susceptible to interest rate risk and credit risk. In addition, many types of swaps and other 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. Management risk: The risk that the investment strategies, techniques and risk analyses employed by the Advisor may not produce the desired results.
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. 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 Returns [Text]	rr_PerformanceInformationIllustratesVariabilityOfReturns	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.
Performance Availability Website Address [Text]	rr_PerformanceAvailabilityWebSiteAddress	http://globalam-us.ubs.com/corpweb/performance.do
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	UBS Core Plus Bond Fund Annual Total Returns of Class Y Shares
Bar Chart Closing [Text Block]	rr_BarChartClosingTextBlock	Total return January 1 - September 30, 2012: 5.23% Best quarter during calendar years shown-3Q 2009: 5.28% Worst quarter during calendar years shown-1Q 2008: (6.16)%
Index No Deduction for Fees, Expenses, Taxes [Text]	rr_IndexNoDeductionForFeesExpensesTaxes	Index 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	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 Y shares' after-tax returns shown.
Caption	rr_AverageAnnualReturnCaption	Average annual total returns (for the periods ended December 31, 2011)
UBS Core Plus Bond Fund (Prospectus Summary) | UBS Core Plus Bond Fund | Barclays US Aggregate Index
Risk Return [Abstract]	rr_RiskReturnAbstract
Label	rr_AverageAnnualReturnLabel	Barclays US Aggregate Index
1 Year	rr_AverageAnnualReturnYear01	7.84%
5 Years	rr_AverageAnnualReturnYear05	6.50%
10 Years	rr_AverageAnnualReturnYear10	5.78%
UBS Core Plus Bond Fund (Prospectus Summary) | UBS Core Plus Bond Fund | Class A
Risk Return [Abstract]	rr_RiskReturnAbstract
Maximum front-end sales charge (load) imposed on purchases (as a % of offering price)	rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice	4.50%
Maximum contingent deferred sales charge (load) (CDSC) (as a % of purchase or sales price, whichever is less)	rr_MaximumDeferredSalesChargeOverOfferingPrice	none	[1]
Redemption fee (as a % of amount redeemed within 90 days of purchase, if applicable)	rr_RedemptionFeeOverRedemption	(1.00%)
Management fees	rr_ManagementFeesOverAssets	0.50%
Distribution and/or service (12b-1) fees	rr_DistributionAndService12b1FeesOverAssets	0.25%
Other expenses	rr_OtherExpensesOverAssets	0.70%
Acquired fund fees and expenses	rr_AcquiredFundFeesAndExpensesOverAssets	0.01%
Total annual fund operating expenses	rr_ExpensesOverAssets	1.46%	[2]
Less management fee waiver/expense reimbursements	rr_FeeWaiverOrReimbursementOverAssets	(0.81%)
Total annual fund operating expenses after management fee waiver/expense reimbursements	rr_NetExpensesOverAssets	0.65%	[2],[3]
Fee Waiver or Reimbursement over Assets, Date of Termination	rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination	2013-10-28
Expense Example, with Redemption, 1 Year	rr_ExpenseExampleYear01	513
Expense Example, with Redemption, 3 Years	rr_ExpenseExampleYear03	815
Expense Example, with Redemption, 5 Years	rr_ExpenseExampleYear05	1,138
Expense Example, with Redemption, 10 Years	rr_ExpenseExampleYear10	2,051
Label	rr_AverageAnnualReturnLabel	Class A Return before taxes
1 Year	rr_AverageAnnualReturnYear01	2.46%
5 Years	rr_AverageAnnualReturnYear05	1.28%
10 Years	rr_AverageAnnualReturnYear10	2.86%
Inception Date	rr_AverageAnnualReturnInceptionDate	Jun. 30, 1997
UBS Core Plus Bond Fund (Prospectus Summary) | UBS Core Plus Bond Fund | Class C
Risk Return [Abstract]	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	0.75%
Redemption fee (as a % of amount redeemed within 90 days of purchase, if applicable)	rr_RedemptionFeeOverRedemption	(1.00%)
Management fees	rr_ManagementFeesOverAssets	0.50%
Distribution and/or service (12b-1) fees	rr_DistributionAndService12b1FeesOverAssets	0.75%
Other expenses	rr_OtherExpensesOverAssets	0.66%
Acquired fund fees and expenses	rr_AcquiredFundFeesAndExpensesOverAssets	0.01%
Total annual fund operating expenses	rr_ExpensesOverAssets	1.92%	[2]
Less management fee waiver/expense reimbursements	rr_FeeWaiverOrReimbursementOverAssets	(0.77%)
Total annual fund operating expenses after management fee waiver/expense reimbursements	rr_NetExpensesOverAssets	1.15%	[2],[3]
Fee Waiver or Reimbursement over Assets, Date of Termination	rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination	2013-10-28
Expense Example, with Redemption, 1 Year	rr_ExpenseExampleYear01	192
Expense Example, with Redemption, 3 Years	rr_ExpenseExampleYear03	528
Expense Example, with Redemption, 5 Years	rr_ExpenseExampleYear05	965
Expense Example, with Redemption, 10 Years	rr_ExpenseExampleYear10	2,181
Expense Example, No Redemption, 1 Year	rr_ExpenseExampleNoRedemptionYear01	117
Expense Example, No Redemption, 3 Years	rr_ExpenseExampleNoRedemptionYear03	528
Expense Example, No Redemption, 5 Years	rr_ExpenseExampleNoRedemptionYear05	965
Expense Example, No Redemption, 10 Years	rr_ExpenseExampleNoRedemptionYear10	2,181
Label	rr_AverageAnnualReturnLabel	Class C Return before taxes	[4]
1 Year	rr_AverageAnnualReturnYear01	6.08%
5 Years	rr_AverageAnnualReturnYear05	1.67%
10 Years	rr_AverageAnnualReturnYear10	2.80%
Inception Date	rr_AverageAnnualReturnInceptionDate	Nov. 08, 2001
UBS Core Plus Bond Fund (Prospectus Summary) | UBS Core Plus Bond Fund | Class Y
Risk Return [Abstract]	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 fees	rr_ManagementFeesOverAssets	0.50%
Distribution and/or service (12b-1) fees	rr_DistributionAndService12b1FeesOverAssets	none
Other expenses	rr_OtherExpensesOverAssets	0.62%
Acquired fund fees and expenses	rr_AcquiredFundFeesAndExpensesOverAssets	0.01%
Total annual fund operating expenses	rr_ExpensesOverAssets	1.13%	[2]
Less management fee waiver/expense reimbursements	rr_FeeWaiverOrReimbursementOverAssets	(0.73%)
Total annual fund operating expenses after management fee waiver/expense reimbursements	rr_NetExpensesOverAssets	0.40%	[2],[3]
Fee Waiver or Reimbursement over Assets, Date of Termination	rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination	2013-10-28
Expense Example, with Redemption, 1 Year	rr_ExpenseExampleYear01	41
Expense Example, with Redemption, 3 Years	rr_ExpenseExampleYear03	287
Expense Example, with Redemption, 5 Years	rr_ExpenseExampleYear05	552
Expense Example, with Redemption, 10 Years	rr_ExpenseExampleYear10	1,309
Annual Return 2002	rr_AnnualReturn2002	9.31%
Annual Return 2003	rr_AnnualReturn2003	3.92%
Annual Return 2004	rr_AnnualReturn2004	4.10%
Annual Return 2005	rr_AnnualReturn2005	2.19%
Annual Return 2006	rr_AnnualReturn2006	4.35%
Annual Return 2007	rr_AnnualReturn2007	1.68%
Annual Return 2008	rr_AnnualReturn2008	(14.01%)
Annual Return 2009	rr_AnnualReturn2009	10.91%
Annual Return 2010	rr_AnnualReturn2010	8.01%
Annual Return 2011	rr_AnnualReturn2011	7.74%
Year to Date Return, Label	rr_YearToDateReturnLabel	Total return January 1 - September 30, 2012:
Bar Chart, Year to Date Return, Date	rr_BarChartYearToDateReturnDate	Sep. 30, 2012
Bar Chart, Year to Date Return	rr_BarChartYearToDateReturn	5.23%
Highest Quarterly Return, Label	rr_HighestQuarterlyReturnLabel	Best quarter during calendar years shown-3Q 2009:
Highest Quarterly Return, Date	rr_BarChartHighestQuarterlyReturnDate	Sep. 30, 2009
Highest Quarterly Return	rr_BarChartHighestQuarterlyReturn	5.28%
Lowest Quarterly Return, Label	rr_LowestQuarterlyReturnLabel	Worst quarter during calendar years shown-1Q 2008:
Lowest Quarterly Return, Date	rr_BarChartLowestQuarterlyReturnDate	Mar. 31, 2008
Lowest Quarterly Return	rr_BarChartLowestQuarterlyReturn	(6.16%)
Label	rr_AverageAnnualReturnLabel	Class Y Return before taxes
1 Year	rr_AverageAnnualReturnYear01	7.74%
5 Years	rr_AverageAnnualReturnYear05	2.45%
10 Years	rr_AverageAnnualReturnYear10	3.59%
Inception Date	rr_AverageAnnualReturnInceptionDate	Aug. 31, 1995
UBS Core Plus Bond Fund (Prospectus Summary) | UBS Core Plus Bond Fund | Class Y | After Taxes on Distributions
Risk Return [Abstract]	rr_RiskReturnAbstract
Label	rr_AverageAnnualReturnLabel	Class Y Return after taxes on distributions
1 Year	rr_AverageAnnualReturnYear01	6.61%
5 Years	rr_AverageAnnualReturnYear05	0.50%
10 Years	rr_AverageAnnualReturnYear10	1.77%
Inception Date	rr_AverageAnnualReturnInceptionDate	Aug. 31, 1995
UBS Core Plus Bond Fund (Prospectus Summary) | UBS Core Plus Bond Fund | Class Y | After Taxes on Distributions and Sales
Risk Return [Abstract]	rr_RiskReturnAbstract
Label	rr_AverageAnnualReturnLabel	Class Y Return after taxes on distributions and sale of fund shares
1 Year	rr_AverageAnnualReturnYear01	5.01%
5 Years	rr_AverageAnnualReturnYear05	0.91%
10 Years	rr_AverageAnnualReturnYear10	1.98%
Inception Date	rr_AverageAnnualReturnInceptionDate	Aug. 31, 1995

[1] 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.

[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 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 28, 2013, do not exceed 0.64% for Class A shares, 1.14% for Class C shares and 0.39% 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. 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, the UBS Global AM (Americas)'s three year recoupment rights will survive.

[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.

XML

UBS High Yield Fund (Prospectus Summary) | UBS High Yield Fund

UBS High Yield Fund

Investment objective

The Fund seeks to provide high current income, as well as capital growth when
consistent with high current income.

Fees and expenses

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 $100,000 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 17 of the Fund's
prospectus and in "Reduced sales charges, additional purchase, exchange and
redemption information and other services" on page 74 of the Fund's statement of
additional information ("SAI").

Shareholder fees (fees paid directly from your investment)

Shareholder Fees UBS High Yield Fund		Class A	Class C	Class Y
Maximum front-end sales charge (load) imposed on purchases (as a % of offering price)		4.50%	none	none
Maximum contingent deferred sales charge (load) (CDSC) (as a % of purchase or sales price, whichever is less)	[1]	none	0.75%	none
Redemption fee (as a % of amount redeemed within 90 days of purchase, if applicable)	[1]	1.00%	1.00%	1.00%

Annual fund operating expenses (expenses that you pay each year as a percentage of the value of your investment)

Annual Fund Operating Expenses UBS High Yield Fund		Class A		Class C		Class Y
Management fees		0.60%		0.60%		0.60%
Distribution and/or service (12b-1) fees		0.25%	[1]	0.75%	[1]	none
Other expenses	[2]	0.48%		0.48%		0.41%
Total annual fund operating expenses		1.33%		1.83%		1.01%
Less management fee waiver/expense reimbursements		0.13%		0.13%		0.06%
Total annual fund operating expenses after management fee waiver/expense reimbursements	[3]	1.20%		1.70%	[1]	0.95%

Example

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:

Expense Example UBS High Yield Fund (USD $)	Expense Example, with Redemption, 1 Year	Expense Example, with Redemption, 3 Years	Expense Example, with Redemption, 5 Years	Expense Example, with Redemption, 10 Years
Class A	567	840	1,134	1,969
Class C	248	563	978	2,137
Class Y	97	316	552	1,231

Expense Example, No Redemption (USD $)	Expense Example, No Redemption, 1 Year	Expense Example, No Redemption, 3 Years	Expense Example, No Redemption, 5 Years	Expense Example, No Redemption, 10 Years
UBS High Yield Fund Class C	173	563	978	2,137

Portfolio turnover

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 50%
of the average value of its portfolio.

Principal strategies

Principal investments

The Fund invests in a portfolio of higher yielding, lower-rated debt securities
issued by foreign and domestic companies. Under normal conditions, at least 80%
of the Fund's net assets (plus borrowings for investment purposes, if any) are
invested in fixed income securities that provide higher yields and are
lower-rated. The Fund may invest in fixed income securities of any maturity, but
generally invests in securities having an initial maturity of more than one
year. Investments in fixed income securities may include, but are not limited
to, mortgage-backed and asset-backed securities. Up to 25% of the Fund's total
assets may be invested in foreign securities, which may include securities of
issuers in emerging markets.

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
options, futures, forward agreements, swap agreements (specifically, interest
rate, total return, currency and credit default swaps), credit-linked securities
and structured investments. All of these derivatives may be used for risk
management purposes, such as hedging against a specific security or currency, or
to manage or adjust the risk profile of the Fund. In addition, all of the
derivative instruments listed above may be used for investment (non-hedging)
purposes to earn income; to enhance returns; to replace more traditional direct
investments; to obtain exposure to certain markets; to establish net short
positions for individual sectors, markets, currencies or securities; or to
adjust the Fund's portfolio duration.

Lower-rated bonds are bonds rated in the lower rating categories of Moody's
Investors Service, Inc. ("Moody's") and Standard & Poor's Ratings Group ("S&P"),
including securities rated Ba or lower by Moody's or BB or lower by S&P.
Securities rated in these categories are considered to be of poorer quality and
predominantly speculative. Bonds in these categories may also be called "high
yield bonds" or "junk bonds."

Management process

The Fund invests in securities that the Advisor expects will appreciate in value
as a result of declines in long-term interest rates or favorable developments
affecting the business or prospects of the issuer which may improve the issuer's
financial condition and credit rating. In selecting securities, the Advisor uses
a quantitative and qualitative credit review process that assesses the ways in
which macroeconomic forces (such as inflation, risk premiums and interest
rates), as well as certain quantitative factors, such as historical operating
results, calculation of credit ratios and expected future outlook, may affect
industry trends. Against the output of this model, the Advisor considers the
viability of specific debt securities, assessing management strength, market
position, competitive environment and financial flexibility.

The Advisor determines optimal sector, security and credit rating weightings
based on its assessment of macro and microeconomic factors. Depending on market
conditions, undervalued securities may be found in different sectors. Therefore,
all investment decisions are interrelated and made using ongoing sector,
security and rating evaluation.

Main risks

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.

Interest rate risk: An increase in prevailing interest rates typically causes
the value of fixed income securities to fall. Changes in interest rates will
likely affect the value of longer-duration fixed income securities more than
shorter-duration securities and higher quality securities more than lower
quality securities. When interest rates are falling, some fixed income
securities provide that the issuer may repay them earlier than the maturity
date, and if this occurs the Fund may have to reinvest these repayments at lower
interest rates.

Credit risk: The risk that the Fund could lose money if the issuer or guarantor
of a fixed income security, or the counterparty to or guarantor of a derivative
contract, is unable or unwilling to meet its financial obligations. This risk is
likely greater for lower quality investments than for investments that are
higher quality.

High yield bond risk: The risk that the issuer of bonds with ratings of BB (S&P)
or Ba (Moody's) or below, or deemed of equivalent quality, will default or
otherwise be unable to honor a financial obligation (also known as lower-rated
or "junk bonds"). These securities are considered to be predominately
speculative with respect to an issuer's capacity to pay interest and repay
principal in accordance with the terms of the obligations. Lower-quality bonds
are more likely to be subject to an issuer's default or downgrade than
investment grade (higher-quality) bonds.

Market risk: The risk that 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.

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. Investments in foreign government bonds involve special risks because
the Fund may have limited legal recourse in the event of default. Also, foreign
securities are sometimes less liquid and more difficult to sell and to value
than securities of US issuers. These risks are greater for investments in
emerging market issuers. In addition, investments in emerging market issuers may
decline in value because of unfavorable foreign government actions, greater
risks of political instability or the absence of accurate information about
emerging market issuers.

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. Derivatives relating to fixed income
markets are especially susceptible to interest rate risk and credit risk. In
addition, many types of swaps and other 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.

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

Performance

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.

UBS High Yield Fund Annual Total Returns of Class Y Shares

Total return January 1 - September 30, 2012: 11.60%
Best quarter during calendar years shown-2Q 2009: 19.58%
Worst quarter during calendar years shown-4Q 2008: (16.49)%

Average annual total returns (for the periods ended December 31, 2011)

Average Annual Total Returns UBS High Yield Fund	Label		1 Year	5 Years	10 Years	Inception Date
Class A	Class A Return before taxes		(2.16%)	4.35%	6.50%	Dec. 31, 1998
Class C	Class C Return before taxes	[1]	1.19%	4.81%	6.46%	Nov. 07, 2001
Class Y	Class Y Return before taxes		2.48%	5.57%	7.26%	Sep. 30, 1997
After Taxes on Distributions Class Y	Class Y Return after taxes on distributions		(0.24%)	2.35%	3.98%	Sep. 30, 1997
After Taxes on Distributions and Sales Class Y	Class Y Return after taxes on distributions and sale of fund shares		1.61%	2.78%	4.20%	Sep. 30, 1997
BofA Merrill Lynch US High Yield Cash Pay Constrained Index	BofA Merrill Lynch US High Yield Cash Pay Constrained Index		4.49%	7.43%	8.66%

[1] In connection with the proposed Reorganization of the Fund into the Nationwide High Yield Bond Fund series of Nationwide Mutual Funds, effective as of the close of business on July 16, 2012, the Fund's Board of Trustees approved the waiver of the annual Rule 12b-1 distribution fee of 0.50% of average net assets that is charged to the shareholders of Class C shares of the Fund. In addition, the Fund has voluntarily lowered the expense limit applicable to Class C shares to 1.20% to reflect the waiver of this Rule 12b-1 distribution fee. The annual service fee of 0.25% of average net assets that is charged on Class A and Class C shares of the Fund was not eliminated. The Board of Trustees also approved the waiver of the 1.00% redemption fee that is charged on sales or exchanges of any Class of shares of the Fund less than 90 days after purchase and the elimination of all contingent deferred sales charges (CDSC) assessed on redemptions that are charged on Class A shares (on purchases above $1 million) and Class C shares. With respect to exchanges of shares of the Fund for shares of another UBS Family Fund, the length of time you held your shares of the UBS Fund will still be considered when determining whether you must pay a CDSC when you sell the shares of the UBS Family Fund acquired in the exchange. These changes are not reflected in the fee and expense tables above or the expense example below.

[1] In connection with the proposed Reorganization of the Fund into the Nationwide High Yield Bond Fund series of Nationwide Mutual Funds, effective as of the close of business on July 16, 2012, the Fund's Board of Trustees approved the waiver of the annual Rule 12b-1 distribution fee of 0.50% of average net assets that is charged to the shareholders of Class C shares of the Fund. In addition, the Fund has voluntarily lowered the expense limit applicable to Class C shares to 1.20% to reflect the waiver of this Rule 12b-1 distribution fee. The annual service fee of 0.25% of average net assets that is charged on Class A and Class C shares of the Fund was not eliminated. The Board of Trustees also approved the waiver of the 1.00% redemption fee that is charged on sales or exchanges of any Class of shares of the Fund less than 90 days after purchase and the elimination of all contingent deferred sales charges (CDSC) assessed on redemptions that are charged on Class A shares (on purchases above $1 million) and Class C shares. With respect to exchanges of shares of the Fund for shares of another UBS Family Fund, the length of time you held your shares of the UBS Fund will still be considered when determining whether you must pay a CDSC when you sell the shares of the UBS Family Fund acquired in the exchange. These changes are not reflected in the fee and expense tables above or the expense example below.

[2] "Other expenses" include "Acquired fund fees and expenses," which were less than 0.01% of the average net assets of the Fund.

[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, and 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, and dividend expense and security loan fees for securities sold short), through the period ending October 28, 2013, do not exceed 1.20% for Class A shares, 1.70% for Class C shares and 0.95% 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. 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, the UBS Global AM (Americas)'s three year recoupment rights will survive.

[1] 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.

XML

Label	Element	Value
Risk Return [Abstract]	rr_RiskReturnAbstract
ProspectusDate	rr_ProspectusDate	Oct. 29, 2012
UBS U.S. Equity Alpha Fund (Prospectus Summary) | UBS U.S. Equity Alpha Fund
Risk Return [Abstract]	rr_RiskReturnAbstract
Risk/Return [Heading]	rr_RiskReturnHeading	UBS U.S. Equity Alpha 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, while controlling risk.
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 11 of the Fund's prospectus and in "Reduced sales charges, additional purchase, exchange and redemption information and other services" on page 53 of the Fund's statement of additional information ("SAI").
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)
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 85% of the average value of its portfolio.
Portfolio Turnover, Rate	rr_PortfolioTurnoverRate	85.00%
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 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. The Fund will generally invest in equity securities of large and mid capitalization companies but is permitted to invest up to 15% of its net assets in small capitalization companies. The Fund will maintain both long positions and short positions in equity securities and securities with equity-like characteristics. In addition, up to 20% of the Fund's net assets may be invested in securities of foreign companies in developed countries, including long and short positions in foreign equity securities and securities with equity-like characteristics. 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. The Fund may also invest in exchange-traded funds ("ETFs") and similarly structured pooled investments in order to provide exposure to the equity markets while maintaining liquidity. The Fund may also engage in short sales of ETFs and similarly structured pooled investments in order to reduce exposure to certain sectors of the equity markets. Management process The Advisor's investment style is singularly focused on investment fundamentals. The Advisor believes that investment fundamentals determine and describe future cash flows that define fundamental investment value. The Advisor tries to identify and exploit periodic discrepancies between market prices and fundamental value. These price/value discrepancies are used as the building blocks for portfolio construction. In constructing the Fund's portfolio, the Advisor primarily uses fundamental analysis and, to a lesser extent, quantitative analysis to identify securities that are underpriced and overpriced relative to their fundamental value. In general, the Advisor buys securities "long" for the Fund's portfolio that it believes are underpriced and will outperform, and sells securities "short" that it believes are overpriced and will underperform. The Fund anticipates that it will normally maintain long positions in equity securities and securities with equity-like characteristics equal to 120% to 140% of the value of its net assets, short positions in equity securities and securities with equity-like characteristics equal to 20% to 40% of the value of its net assets and cash positions equal to 0% to 10% of the value of its net assets. This active management process is intended to produce performance that outperforms the Fund's benchmark. The Fund's ability to fully implement its investment strategy may be affected by (i) regulatory restrictions prohibiting short sales of certain securities that may be imposed from time to time or (ii) the Advisor's written procedures designed to address potential conflicts that exist where the Advisor manages both long-only and long/short accounts and/or funds. In employing its investment strategies for the Fund, the Advisor attempts to outperform (before taking into account any Fund fees or expenses) the Russell 1000 Index by 2.50% to 5.00% per year with a similar level of market risk as the benchmark over a full market cycle. A typical market cycle is 4 to 7 years. The Advisor does not represent or guarantee that the Fund will meet this total return goal.
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. Management risk: The risk that the investment strategies, techniques and risk analyses employed by the Advisor may not produce the desired results. Short sales risk: There are certain unique risks associated with the use of short sales strategies. When selling a security short, the Advisor will sell a security it does not own at the then-current market price and then borrow the security to deliver to the buyer. The Fund is then obligated to buy the security on a later date so it can return the security to the lender. Short sales therefore involve the risk that the Fund will incur a loss by subsequently buying a security at a higher price than the price at which the Fund previously sold the security short. This would occur if the securities lender required the Fund to deliver the securities the Fund had borrowed at the commencement of the short sale and the Fund was unable to either purchase the security at a favorable price or to borrow the security from another securities lender. If this occurs at a time when other short sellers of the security also want to close out their positions, a "short squeeze" can occur. A short squeeze occurs when demand is greater than supply for the security sold short. Moreover, because the Fund's loss on a short sale arises from increases in the value of the security sold short, such loss, like the price of the security sold short, is theoretically unlimited. By contrast, the Fund's loss on a long position arises from decreases in the value of the security and therefore is limited by the fact that a security's value cannot drop below zero. It is possible that the Fund's securities held long will decline in value at the same time that the value of the securities sold short increases, thereby increasing the potential for loss. 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. 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. 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. Unseasoned company risk: The Fund may invest in relatively new or unseasoned companies that are in their early stages of development. Securities of unseasoned companies present greater risks than securities of larger, more established companies. The companies may have greater risks because they (i) may be dependent on a small number of products or services; (ii) may lack substantial capital reserves; and (iii) do not have proven track records.
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. 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 Returns [Text]	rr_PerformanceInformationIllustratesVariabilityOfReturns	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.
Performance Availability Website Address [Text]	rr_PerformanceAvailabilityWebSiteAddress	http://globalam-us.ubs.com/corpweb/performance.do
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	UBS U.S. Equity Alpha Fund Annual Total Returns of Class Y Shares (2007 is the Fund's first full year of operations)
Bar Chart Closing [Text Block]	rr_BarChartClosingTextBlock	Total return January 1 - September 30, 2012: 12.11% Best quarter during calendar years shown-2Q 2009: 23.05% Worst quarter during calendar years shown-4Q 2008: (27.94)%
Index No Deduction for Fees, Expenses, Taxes [Text]	rr_IndexNoDeductionForFeesExpensesTaxes	Index 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	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 Y shares' after-tax returns shown.
Caption	rr_AverageAnnualReturnCaption	Average annual total returns (for the periods ended December 31, 2011)
UBS U.S. Equity Alpha Fund (Prospectus Summary) | UBS U.S. Equity Alpha Fund | Russell 1000 Index
Risk Return [Abstract]	rr_RiskReturnAbstract
Label	rr_AverageAnnualReturnLabel	Russell 1000 Index
1 Year	rr_AverageAnnualReturnYear01	1.50%
5 Years	rr_AverageAnnualReturnYear05	(0.02%)
Since Inception	rr_AverageAnnualReturnSinceInception	1.25%
UBS U.S. Equity Alpha Fund (Prospectus Summary) | UBS U.S. Equity Alpha Fund | Class A
Risk Return [Abstract]	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_MaximumDeferredSalesChargeOverOfferingPrice	none	[1]
Redemption fee (as a % of amount redeemed within 90 days of purchase, if applicable)	rr_RedemptionFeeOverRedemption	(1.00%)
Management fees	rr_ManagementFeesOverAssets	1.00%
Distribution and/or service (12b-1) fees	rr_DistributionAndService12b1FeesOverAssets	0.25%
Dividend expense and security loan fees for securities sold short	rr_Component1OtherExpensesOverAssets	0.71%
Other	rr_Component2OtherExpensesOverAssets	1.25%
Total other expenses	rr_OtherExpensesOverAssets	1.96%
Acquired fund fees and expenses	rr_AcquiredFundFeesAndExpensesOverAssets	0.01%
Total annual fund operating expenses	rr_ExpensesOverAssets	3.22%	[2]
Less management fee waiver/expense reimbursements	rr_FeeWaiverOrReimbursementOverAssets	(1.00%)
Total annual fund operating expenses after management fee waiver/expense reimbursements	rr_NetExpensesOverAssets	2.22%	[2],[3]
Fee Waiver or Reimbursement over Assets, Date of Termination	rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination	2013-10-28
Expense Example, with Redemption, 1 Year	rr_ExpenseExampleYear01	763
Expense Example, with Redemption, 3 Years	rr_ExpenseExampleYear03	1,399
Expense Example, with Redemption, 5 Years	rr_ExpenseExampleYear05	2,059
Expense Example, with Redemption, 10 Years	rr_ExpenseExampleYear10	3,813
Label	rr_AverageAnnualReturnLabel	Class A Return before taxes
1 Year	rr_AverageAnnualReturnYear01	(8.30%)
5 Years	rr_AverageAnnualReturnYear05	(4.81%)
Since Inception	rr_AverageAnnualReturnSinceInception	(3.06%)
Inception Date	rr_AverageAnnualReturnInceptionDate	Sep. 26, 2006
UBS U.S. Equity Alpha Fund (Prospectus Summary) | UBS U.S. Equity Alpha Fund | Class C
Risk Return [Abstract]	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	1.00%
Redemption fee (as a % of amount redeemed within 90 days of purchase, if applicable)	rr_RedemptionFeeOverRedemption	(1.00%)
Management fees	rr_ManagementFeesOverAssets	1.00%
Distribution and/or service (12b-1) fees	rr_DistributionAndService12b1FeesOverAssets	1.00%
Dividend expense and security loan fees for securities sold short	rr_Component1OtherExpensesOverAssets	0.71%
Other	rr_Component2OtherExpensesOverAssets	1.33%
Total other expenses	rr_OtherExpensesOverAssets	2.04%
Acquired fund fees and expenses	rr_AcquiredFundFeesAndExpensesOverAssets	0.01%
Total annual fund operating expenses	rr_ExpensesOverAssets	4.05%	[2]
Less management fee waiver/expense reimbursements	rr_FeeWaiverOrReimbursementOverAssets	(1.08%)
Total annual fund operating expenses after management fee waiver/expense reimbursements	rr_NetExpensesOverAssets	2.97%	[2],[3]
Fee Waiver or Reimbursement over Assets, Date of Termination	rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination	2013-10-28
Expense Example, with Redemption, 1 Year	rr_ExpenseExampleYear01	400
Expense Example, with Redemption, 3 Years	rr_ExpenseExampleYear03	1,134
Expense Example, with Redemption, 5 Years	rr_ExpenseExampleYear05	1,985
Expense Example, with Redemption, 10 Years	rr_ExpenseExampleYear10	4,182
Expense Example, No Redemption, 1 Year	rr_ExpenseExampleNoRedemptionYear01	300
Expense Example, No Redemption, 3 Years	rr_ExpenseExampleNoRedemptionYear03	1,134
Expense Example, No Redemption, 5 Years	rr_ExpenseExampleNoRedemptionYear05	1,985
Expense Example, No Redemption, 10 Years	rr_ExpenseExampleNoRedemptionYear10	4,182
Label	rr_AverageAnnualReturnLabel	Class C Return before taxes
1 Year	rr_AverageAnnualReturnYear01	(4.76%)
5 Years	rr_AverageAnnualReturnYear05	(4.46%)
Since Inception	rr_AverageAnnualReturnSinceInception	(2.76%)
Inception Date	rr_AverageAnnualReturnInceptionDate	Sep. 26, 2006
UBS U.S. Equity Alpha Fund (Prospectus Summary) | UBS U.S. Equity Alpha Fund | Class Y
Risk Return [Abstract]	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 fees	rr_ManagementFeesOverAssets	1.00%
Distribution and/or service (12b-1) fees	rr_DistributionAndService12b1FeesOverAssets	none
Dividend expense and security loan fees for securities sold short	rr_Component1OtherExpensesOverAssets	0.68%
Other	rr_Component2OtherExpensesOverAssets	1.17%
Total other expenses	rr_OtherExpensesOverAssets	1.85%
Acquired fund fees and expenses	rr_AcquiredFundFeesAndExpensesOverAssets	0.01%
Total annual fund operating expenses	rr_ExpensesOverAssets	2.86%	[2]
Less management fee waiver/expense reimbursements	rr_FeeWaiverOrReimbursementOverAssets	(0.92%)
Total annual fund operating expenses after management fee waiver/expense reimbursements	rr_NetExpensesOverAssets	1.94%	[2],[3]
Fee Waiver or Reimbursement over Assets, Date of Termination	rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination	2013-10-28
Expense Example, with Redemption, 1 Year	rr_ExpenseExampleYear01	197
Expense Example, with Redemption, 3 Years	rr_ExpenseExampleYear03	799
Expense Example, with Redemption, 5 Years	rr_ExpenseExampleYear05	1,427
Expense Example, with Redemption, 10 Years	rr_ExpenseExampleYear10	3,119
Annual Return 2007	rr_AnnualReturn2007	0.51%
Annual Return 2008	rr_AnnualReturn2008	(41.89%)
Annual Return 2009	rr_AnnualReturn2009	36.55%
Annual Return 2010	rr_AnnualReturn2010	8.02%
Annual Return 2011	rr_AnnualReturn2011	(2.72%)
Year to Date Return, Label	rr_YearToDateReturnLabel	Total return January 1 - September 30, 2012:
Bar Chart, Year to Date Return, Date	rr_BarChartYearToDateReturnDate	Sep. 30, 2012
Bar Chart, Year to Date Return	rr_BarChartYearToDateReturn	12.11%
Highest Quarterly Return, Label	rr_HighestQuarterlyReturnLabel	Best quarter during calendar years shown-2Q 2009:
Highest Quarterly Return, Date	rr_BarChartHighestQuarterlyReturnDate	Jun. 30, 2009
Highest Quarterly Return	rr_BarChartHighestQuarterlyReturn	23.05%
Lowest Quarterly Return, Label	rr_LowestQuarterlyReturnLabel	Worst quarter during calendar years shown-4Q 2008:
Lowest Quarterly Return, Date	rr_BarChartLowestQuarterlyReturnDate	Dec. 31, 2008
Lowest Quarterly Return	rr_BarChartLowestQuarterlyReturn	(27.94%)
Label	rr_AverageAnnualReturnLabel	Class Y Return before taxes
1 Year	rr_AverageAnnualReturnYear01	(2.72%)
5 Years	rr_AverageAnnualReturnYear05	(3.47%)
Since Inception	rr_AverageAnnualReturnSinceInception	(1.78%)
Inception Date	rr_AverageAnnualReturnInceptionDate	Sep. 26, 2006
UBS U.S. Equity Alpha Fund (Prospectus Summary) | UBS U.S. Equity Alpha Fund | Class Y | After Taxes on Distributions
Risk Return [Abstract]	rr_RiskReturnAbstract
Label	rr_AverageAnnualReturnLabel	Class Y Return after taxes on distributions
1 Year	rr_AverageAnnualReturnYear01	(2.79%)
5 Years	rr_AverageAnnualReturnYear05	(3.90%)
Since Inception	rr_AverageAnnualReturnSinceInception	(2.20%)
Inception Date	rr_AverageAnnualReturnInceptionDate	Sep. 26, 2006
UBS U.S. Equity Alpha Fund (Prospectus Summary) | UBS U.S. Equity Alpha Fund | Class Y | After Taxes on Distributions and Sales
Risk Return [Abstract]	rr_RiskReturnAbstract
Label	rr_AverageAnnualReturnLabel	Class Y Return after taxes on distributions and sale of fund shares
1 Year	rr_AverageAnnualReturnYear01	(1.69%)
5 Years	rr_AverageAnnualReturnYear05	(3.06%)
Since Inception	rr_AverageAnnualReturnSinceInception	(1.64%)
Inception Date	rr_AverageAnnualReturnInceptionDate	Sep. 26, 2006

[1] 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.

[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, and 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, and dividend expense and security loan fees for securities sold short), through the period ending October 28, 2013, otherwise do not exceed 1.50% for Class A shares, 2.25% for Class C shares and 1.25% 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. 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, the UBS Global AM (Americas)'s three year recoupment rights will survive.

XML

UBS Fixed Income Opportunities Fund (Prospectus Summary) | UBS Fixed Income Opportunities Fund

UBS Fixed Income Opportunities Fund

Investment objective

The Fund seeks to maximize total return, consisting of capital appreciation and
current income.

Fees and expenses

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 34 of the Fund's
prospectus and in "Reduced sales charges, additional purchase, exchange and
redemption information and other services" on page 107 of the Fund's statement
of additional information ("SAI").

Shareholder fees (fees paid directly from your investment)

Shareholder Fees UBS Fixed Income Opportunities Fund	Class A		Class C	Class Y
Maximum front-end sales charge (load) imposed on purchases (as a % of offering price)	4.50%		none	none
Maximum contingent deferred sales charge (load) (CDSC) (as a % of purchase or sales price, whichever is less)	none	[1]	0.75%	none
Redemption fee (as a % of amount redeemed within 90 days of purchase, if applicable)	1.00%		1.00%	1.00%

Annual fund operating expenses (expenses that you pay each year as a percentage of the value of your investment)

Annual Fund Operating Expenses UBS Fixed Income Opportunities Fund		Class A	Class C	Class Y
Management fees		0.65%	0.65%	0.65%
Distribution and/or service (12b-1) fees		0.25%	0.75%	none
Other expenses		0.52%	0.53%	0.49%
Acquired fund fees and expenses		0.09%	0.09%	0.09%
Total annual fund operating expenses	[1]	1.51%	2.02%	1.23%
Less management fee waiver/expense reimbursements		0.47%	0.48%	0.44%
Total annual fund operating expenses after management fee waiver/expense reimbursements	[1][2]	1.04%	1.54%	0.79%

Example

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:

Expense Example UBS Fixed Income Opportunities Fund (USD $)	Expense Example, with Redemption, 1 Year	Expense Example, with Redemption, 3 Years	Expense Example, with Redemption, 5 Years	Expense Example, with Redemption, 10 Years
Class A	551	862	1,194	2,132
Class C	232	587	1,044	2,310
Class Y	81	347	633	1,450

Expense Example, No Redemption (USD $)	Expense Example, No Redemption, 1 Year	Expense Example, No Redemption, 3 Years	Expense Example, No Redemption, 5 Years	Expense Example, No Redemption, 10 Years
UBS Fixed Income Opportunities Fund Class C	157	587	1,044	2,310

Portfolio turnover

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 63%
of the average value of its portfolio.

Principal strategies

Principal investments

The Fund seeks to achieve its investment objective by investing its assets
across a wide range of fixed income securities, currencies and other investments
to generate total returns under a variety of market conditions and economic
cycles. The Fund may invest in fixed income securities of US and non-US issuers
located in developed and emerging market countries.

Under normal circumstances, the Fund invests at least 80% of its net assets
(plus borrowings for investment purposes, if any) in fixed income securities
and/or investments that provide exposure to fixed income securities. Investments
in fixed income securities may include, but are not limited to, securities of
governments throughout the world (including the United States), their agencies
and instrumentalities, cash equivalents, debt securities of supranationals and
corporations including trust-preferred securities, convertible securities,
mortgage-backed securities, asset-backed securities, inflation-linked
securities, equipment trusts and other securitized or collateralized debt
securities. The Fund's investments in fixed income securities may have all types
of interest rate payment and reset terms, including fixed rate, adjustable rate,
zero coupon, pay-in-kind and auction rate features. In addition, the fixed income
securities purchased by the Fund may be denominated in any currency, have coupons
payable in any currency and may be of any maturity or duration. The Fund may invest
in fixed income securities of any credit quality, including non-investment grade
securities (often referred to as high yield securities or "junk bonds").

The Fund expects to use exchange traded and/or over-the-counter derivative
instruments extensively in employing its long/short, globally-oriented fixed
income and currency strategy. Generally, derivatives are financial contracts
whose value depends upon, or is derived from, the value of an underlying asset,
reference rate, or index, and may relate to stocks, bonds, interest rates,
currencies or currency exchange rates, and related indexes. The derivatives in
which the Fund may invest include, but are not limited to, options (including,
but not limited to, options on futures, forwards and swap agreements), futures,
forward agreements, swap agreements (including, but not limited to, interest
rate, total return, currency, credit default and inflation swaps), credit-linked
securities, caps, floors, collars, structured notes and other derivative
instruments. The Fund may invest in derivatives to the extent permitted by the
Investment Company Act of 1940, as amended (the "1940 Act").

The Fund may use derivatives for hedging or non-hedging purposes. The Fund
intends to use derivatives to earn income and enhance returns, to manage or
adjust the risk profile of the Fund, to replace more traditional direct
investments, or to obtain exposure to certain markets. The Fund also may use
derivatives to establish net short positions for individual markets, currencies
and securities or to adjust the Fund's portfolio duration.

In addition, the Fund may establish short positions in fixed income securities
through the use of any of the derivative instruments listed above to achieve a
negative portfolio duration in an effort to take advantage of periods of rising
interest rates and provide the potential for appreciation. The Advisor expects
that the duration of the Fund's portfolio will be between approximately +5 years
and -5 years depending on the level and expected future direction of interest
rates. Duration measures a fixed income security's price sensitivity to interest
rates by indicating the approximate change in a fixed income security's price if
interest rates move up or down in 1% increments. For example, when the level of
interest rates increases by 1%, the price of a fixed income security or a
portfolio of fixed income securities having a positive duration of five years
generally will decrease by approximately 5% and the price of a fixed income
security or a portfolio of fixed income securities having a negative duration of
five years generally will increase by approximately 5%. Conversely when the
level of interest rates decreases by 1%, the price of a fixed income security or
a portfolio of fixed income securities having a positive duration of five years
generally will increase by approximately 5% and the price of a fixed income
security or a portfolio of fixed income securities having a negative duration of
five years generally will decrease by approximately 5%.

Management process

In employing its investment strategies for the Fund, the Advisor attempts to
generate total returns by managing the risks and market exposures of the Fund's
portfolio. The Fund utilizes a long/short, global fixed income and currency
strategy that emphasizes relative value investing. The Fund pursues a
diversified investment strategy and the Advisor has substantial latitude to
invest across broad fixed income and currency markets. At times, the
unconstrained investment approach may lead the Advisor to have sizable
allocations to particular markets, sectors and industries.

The Advisor implements the long/short strategy across multiple dimensions to
gain specific exposure to investments that it believes offer an attractive
risk-reward opportunity. Typically, the Advisor seeks to exploit opportunities,
both long and short, where the market valuation of a particular security differs
from the Advisor's valuation for the same security.

The Advisor actively manages the Fund's currency exposure and attempts to
generate total returns and manage risk by identifying relative valuation
discrepancies among global currencies as well as implementing hedging strategies
to limit unwanted currency risks. These decisions are integrated within the
macroeconomic framework analysis of global market and economic conditions.

In employing its investment strategies for the Fund, the Advisor attempts to
achieve a total rate of return for the Fund which exceeds the rate of return on
3 Month LIBOR (a short-term interest rate that banks charge one another and that
is generally representative of short-term interest rates) by 3% for Class A
shares, 2.5% for Class C shares, and 3.25% for Class Y shares, each net of fund
ordinary operating expenses over rolling five year time horizons. The Advisor
does not represent or guarantee that the Fund will meet this total return goal.

The Fund is not a money market, stable net asset value, cash alternative, or a
traditional long only fixed income fund. The Fund seeks to maximize total
return, consisting of capital appreciation and current income by investing in
global fixed income and currency markets. At times, the Fund may have exposures
to higher risk strategies within the fixed income and currency markets, and it
may take both long and short positions utilizing various instruments including
the extensive use of derivatives. Furthermore, given the Fund's less constrained
investment approach, it may maintain overall net short positions in any
particular market. While the Advisor will seek to manage the Fund's volatility
and overall risk exposure in a prudent manner, it is quite possible that the
Fund may exhibit negative returns in any particular month, quarter or a year.

Main risks

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 risk that 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.

Interest rate risk: An increase in prevailing interest rates typically causes
the value of fixed income securities to fall. When the Fund has a negative
portfolio duration, a decline in interest rates may negatively impact the Fund's
value. Changes in interest rates will likely affect the value of longer-duration
fixed income securities more than shorter-duration securities and higher quality
securities more than lower quality securities. When interest rates are falling,
some fixed income securities provide that the issuer may repay them earlier than
the maturity date, and if this occurs the Fund may have to reinvest these
repayments at lower interest rates.

Credit risk: The risk that the Fund could lose money if the issuer or guarantor
of a fixed income security, or the counterparty to or guarantor of a derivative
contract, is unable or unwilling to meet its financial obligations. This risk is
likely greater for lower quality investments than for investments that are
higher quality.

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. Investments in foreign government bonds involve special risks because
the Fund may have limited legal recourse in the event of default. Also, foreign
securities are sometimes less liquid and more difficult to sell and to value
than securities of US issuers. These risks are greater for investments in
emerging market issuers. In addition, investments in emerging market issuers may
decline in value because of unfavorable foreign government actions, greater
risks of political instability or the absence of accurate information about
emerging market issuers.
  
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.

High yield bond risk: The risk that the issuer of bonds with ratings of BB
(Standard & Poor's Ratings Group ("S&P")) or Ba (Moody's Investors Service, Inc.
("Moody's")) or below, or deemed of equivalent quality, will default or
otherwise be unable to honor a financial obligation (also known as lower-rated
or "junk bonds"). These securities are considered to be predominately
speculative with respect to an issuer's capacity to pay interest and repay
principal in accordance with the terms of the obligations. Lower-quality bonds
are more likely to be subject to an issuer's default or downgrade than
investment grade (higher-quality) bonds.

Illiquidity risk: The risk that investments cannot be readily sold at the
desired time or price, and the Fund may have to accept a lower price or may not
be able to sell the security at all. An inability to sell securities can
adversely affect the Fund's value or prevent the Fund from taking advantage of
other investment opportunities.

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. Derivatives relating to fixed income
markets are especially susceptible to interest rate risk and credit risk. In
addition, many types of swaps and other 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.

Investing in other funds risks: The Fund's investment performance is affected by
the investment performance of the underlying funds in which the Fund may invest.
Through its investment in the underlying funds, the Fund is subject to the risks
of the underlying funds' investments and subject to the underlying funds'
expenses.

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

Performance

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 the Fund's performance for the year 2011 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.

UBS Fixed Income Opportunities Fund Annual Total Returns of Class Y Shares (2011 is the Fund's first full year of operations)

Total return January 1 - September 30, 2012: 6.22%
Best quarter during calendar year shown-1Q 2011: 0.88%
Worst quarter during calendar year shown-2Q 2011: (2.20)%

Average annual total returns (for the periods ended December 31, 2011)

Average Annual Total Returns UBS Fixed Income Opportunities Fund	Label	1 Year	Since Inception	Inception Date
Class A	Class A Return before taxes	(6.17%)	(3.76%)	Nov. 29, 2010
Class C	Class C Return before taxes	(2.91%)	(0.14%)	Nov. 29, 2010
Class Y	Class Y Return before taxes	(1.53%)	0.71%	Nov. 29, 2010
After Taxes on Distributions Class Y	Class Y Return after taxes on distributions	(2.90%)	(0.65%)	Nov. 29, 2010
After Taxes on Distributions and Sales Class Y	Class Y Return after taxes on distributions and sale of fund shares	(0.62%)	(0.01%)	Nov. 29, 2010
BofA Merrill Lynch US Dollar 3-Month LIBOR Constant Maturity Index	BofA Merrill Lynch US Dollar 3-Month LIBOR Constant Maturity Index	0.27%	0.27%

[1] 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.

[1] 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.

[2] 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, and 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, and dividend expense and security loan fees for securities sold short), through the period ending October 28, 2013, do not exceed 0.95% for Class A shares, 1.45% for Class C shares and 0.70% 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. 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, the UBS Global AM (Americas)'s three year recoupment rights will survive.

XML

Label	Element	Value
Risk Return [Abstract]	rr_RiskReturnAbstract
ProspectusDate	rr_ProspectusDate	Oct. 29, 2012
UBS U.S. Small Cap Growth Fund (Prospectus Summary) | UBS U.S. Small Cap Growth Fund
Risk Return [Abstract]	rr_RiskReturnAbstract
Risk/Return [Heading]	rr_RiskReturnHeading	UBS U.S. Small Cap Growth Fund
Objective [Heading]	rr_ObjectiveHeading	Investment objective
Objective, Primary [Text Block]	rr_ObjectivePrimaryTextBlock	The Fund seeks to provide long-term capital appreciation.
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 37 of the Fund's prospectus and in "Reduced sales charges, additional purchase, exchange and redemption information and other services" on page 107 of the Fund's statement of additional information ("SAI").
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)
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 48% of the average value of its portfolio.
Portfolio Turnover, Rate	rr_PortfolioTurnoverRate	48.00%
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 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 [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. 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 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. 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 Returns [Text]	rr_PerformanceInformationIllustratesVariabilityOfReturns	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.
Performance Availability Website Address [Text]	rr_PerformanceAvailabilityWebSiteAddress	http://globalam-us.ubs.com/corpweb/performance.do
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	UBS U.S. Small Cap Growth Fund Annual Total Returns of Class Y Shares
Bar Chart Closing [Text Block]	rr_BarChartClosingTextBlock	Total return January 1 - September 30, 2012: 19.85% Best quarter during calendar years shown-2Q 2003: 20.83% Worst quarter during calendar years shown-4Q 2008: (32.03)%
Index No Deduction for Fees, Expenses, Taxes [Text]	rr_IndexNoDeductionForFeesExpensesTaxes	Index 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	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 Y shares' after-tax returns shown.
Caption	rr_AverageAnnualReturnCaption	Average annual total returns (for the periods ended December 31, 2011)
UBS U.S. Small Cap Growth Fund (Prospectus Summary) | UBS U.S. Small Cap Growth Fund | Russell 2000 Growth Index
Risk Return [Abstract]	rr_RiskReturnAbstract
Label	rr_AverageAnnualReturnLabel	Russell 2000 Growth Index
1 Year	rr_AverageAnnualReturnYear01	(2.91%)
5 Years	rr_AverageAnnualReturnYear05	2.09%
10 Years	rr_AverageAnnualReturnYear10	4.48%
UBS U.S. Small Cap Growth Fund (Prospectus Summary) | UBS U.S. Small Cap Growth Fund | Class A
Risk Return [Abstract]	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_MaximumDeferredSalesChargeOverOfferingPrice	none	[1]
Redemption fee (as a % of amount redeemed within 90 days of purchase, if applicable)	rr_RedemptionFeeOverRedemption	(1.00%)
Management fees	rr_ManagementFeesOverAssets	0.85%
Distribution and/or service (12b-1) fees	rr_DistributionAndService12b1FeesOverAssets	0.25%
Other expenses	rr_OtherExpensesOverAssets	0.47%
Acquired fund fees and expenses	rr_AcquiredFundFeesAndExpensesOverAssets	0.01%
Total annual fund operating expenses	rr_ExpensesOverAssets	1.58%	[2]
Less management fee waiver/expense reimbursements	rr_FeeWaiverOrReimbursementOverAssets	(0.17%)
Total annual fund operating expenses after management fee waiver/expense reimbursements	rr_NetExpensesOverAssets	1.41%	[2],[3]
Fee Waiver or Reimbursement over Assets, Date of Termination	rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination	2013-10-28
Expense Example, with Redemption, 1 Year	rr_ExpenseExampleYear01	686
Expense Example, with Redemption, 3 Years	rr_ExpenseExampleYear03	1,006
Expense Example, with Redemption, 5 Years	rr_ExpenseExampleYear05	1,348
Expense Example, with Redemption, 10 Years	rr_ExpenseExampleYear10	2,311
Label	rr_AverageAnnualReturnLabel	Class A Return before taxes
1 Year	rr_AverageAnnualReturnYear01	(6.04%)
5 Years	rr_AverageAnnualReturnYear05	0.17%
10 Years	rr_AverageAnnualReturnYear10	4.22%
Inception Date	rr_AverageAnnualReturnInceptionDate	Dec. 31, 1998
UBS U.S. Small Cap Growth Fund (Prospectus Summary) | UBS U.S. Small Cap Growth Fund | Class C
Risk Return [Abstract]	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	1.00%
Redemption fee (as a % of amount redeemed within 90 days of purchase, if applicable)	rr_RedemptionFeeOverRedemption	(1.00%)
Management fees	rr_ManagementFeesOverAssets	0.85%
Distribution and/or service (12b-1) fees	rr_DistributionAndService12b1FeesOverAssets	1.00%
Other expenses	rr_OtherExpensesOverAssets	0.50%
Acquired fund fees and expenses	rr_AcquiredFundFeesAndExpensesOverAssets	0.01%
Total annual fund operating expenses	rr_ExpensesOverAssets	2.36%	[2]
Less management fee waiver/expense reimbursements	rr_FeeWaiverOrReimbursementOverAssets	(0.20%)
Total annual fund operating expenses after management fee waiver/expense reimbursements	rr_NetExpensesOverAssets	2.16%	[2],[3]
Fee Waiver or Reimbursement over Assets, Date of Termination	rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination	2013-10-28
Expense Example, with Redemption, 1 Year	rr_ExpenseExampleYear01	319
Expense Example, with Redemption, 3 Years	rr_ExpenseExampleYear03	717
Expense Example, with Redemption, 5 Years	rr_ExpenseExampleYear05	1,242
Expense Example, with Redemption, 10 Years	rr_ExpenseExampleYear10	2,681
Expense Example, No Redemption, 1 Year	rr_ExpenseExampleNoRedemptionYear01	219
Expense Example, No Redemption, 3 Years	rr_ExpenseExampleNoRedemptionYear03	717
Expense Example, No Redemption, 5 Years	rr_ExpenseExampleNoRedemptionYear05	1,242
Expense Example, No Redemption, 10 Years	rr_ExpenseExampleNoRedemptionYear10	2,681
Label	rr_AverageAnnualReturnLabel	Class C Return before taxes	[4]
1 Year	rr_AverageAnnualReturnYear01	(2.25%)
5 Years	rr_AverageAnnualReturnYear05	0.57%
10 Years	rr_AverageAnnualReturnYear10	4.03%
Inception Date	rr_AverageAnnualReturnInceptionDate	Nov. 19, 2001
UBS U.S. Small Cap Growth Fund (Prospectus Summary) | UBS U.S. Small Cap Growth Fund | Class Y
Risk Return [Abstract]	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 fees	rr_ManagementFeesOverAssets	0.85%
Distribution and/or service (12b-1) fees	rr_DistributionAndService12b1FeesOverAssets	none
Other expenses	rr_OtherExpensesOverAssets	0.30%
Acquired fund fees and expenses	rr_AcquiredFundFeesAndExpensesOverAssets	0.01%
Total annual fund operating expenses	rr_ExpensesOverAssets	1.16%	[2]
Less management fee waiver/expense reimbursements	rr_FeeWaiverOrReimbursementOverAssets	none
Total annual fund operating expenses after management fee waiver/expense reimbursements	rr_NetExpensesOverAssets	1.16%	[2],[3]
Fee Waiver or Reimbursement over Assets, Date of Termination	rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination	2013-10-28
Expense Example, with Redemption, 1 Year	rr_ExpenseExampleYear01	118
Expense Example, with Redemption, 3 Years	rr_ExpenseExampleYear03	368
Expense Example, with Redemption, 5 Years	rr_ExpenseExampleYear05	638
Expense Example, with Redemption, 10 Years	rr_ExpenseExampleYear10	1,409
Annual Return 2002	rr_AnnualReturn2002	(18.42%)
Annual Return 2003	rr_AnnualReturn2003	44.75%
Annual Return 2004	rr_AnnualReturn2004	10.92%
Annual Return 2005	rr_AnnualReturn2005	6.63%
Annual Return 2006	rr_AnnualReturn2006	8.59%
Annual Return 2007	rr_AnnualReturn2007	4.96%
Annual Return 2008	rr_AnnualReturn2008	(44.11%)
Annual Return 2009	rr_AnnualReturn2009	33.41%
Annual Return 2010	rr_AnnualReturn2010	38.62%
Annual Return 2011	rr_AnnualReturn2011	(0.33%)
Year to Date Return, Label	rr_YearToDateReturnLabel	Total return January 1 - September 30, 2012:
Bar Chart, Year to Date Return, Date	rr_BarChartYearToDateReturnDate	Sep. 30, 2012
Bar Chart, Year to Date Return	rr_BarChartYearToDateReturn	19.85%
Highest Quarterly Return, Label	rr_HighestQuarterlyReturnLabel	Best quarter during calendar years shown-2Q 2003:
Highest Quarterly Return, Date	rr_BarChartHighestQuarterlyReturnDate	Jun. 30, 2003
Highest Quarterly Return	rr_BarChartHighestQuarterlyReturn	20.83%
Lowest Quarterly Return, Label	rr_LowestQuarterlyReturnLabel	Worst quarter during calendar years shown-4Q 2008:
Lowest Quarterly Return, Date	rr_BarChartLowestQuarterlyReturnDate	Dec. 31, 2008
Lowest Quarterly Return	rr_BarChartLowestQuarterlyReturn	(32.03%)
Label	rr_AverageAnnualReturnLabel	Class Y Return before taxes
1 Year	rr_AverageAnnualReturnYear01	(0.33%)
5 Years	rr_AverageAnnualReturnYear05	1.58%
10 Years	rr_AverageAnnualReturnYear10	5.07%
Inception Date	rr_AverageAnnualReturnInceptionDate	Sep. 30, 1997
UBS U.S. Small Cap Growth Fund (Prospectus Summary) | UBS U.S. Small Cap Growth Fund | Class Y | After Taxes on Distributions
Risk Return [Abstract]	rr_RiskReturnAbstract
Label	rr_AverageAnnualReturnLabel	Class Y Return after taxes on distributions
1 Year	rr_AverageAnnualReturnYear01	(0.33%)
5 Years	rr_AverageAnnualReturnYear05	1.26%
10 Years	rr_AverageAnnualReturnYear10	4.77%
Inception Date	rr_AverageAnnualReturnInceptionDate	Sep. 30, 1997
UBS U.S. Small Cap Growth Fund (Prospectus Summary) | UBS U.S. Small Cap Growth Fund | Class Y | After Taxes on Distributions and Sales
Risk Return [Abstract]	rr_RiskReturnAbstract
Label	rr_AverageAnnualReturnLabel	Class Y Return after taxes on distributions and sale of fund shares
1 Year	rr_AverageAnnualReturnYear01	(0.22%)
5 Years	rr_AverageAnnualReturnYear05	1.23%
10 Years	rr_AverageAnnualReturnYear10	4.36%
Inception Date	rr_AverageAnnualReturnInceptionDate	Sep. 30, 1997

[1] 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.

[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, and 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, and dividend expense and security loan fees for securities sold short), through the period ending October 28, 2013, do not exceed 1.40% for Class A 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. 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, the UBS Global AM (Americas)'s three year recoupment rights will survive.

[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.

XML

Label	Element	Value
Risk Return [Abstract]	rr_RiskReturnAbstract
ProspectusDate	rr_ProspectusDate	Oct. 29, 2012
UBS Global Frontier Fund (Prospectus Summary) | UBS Global Frontier Fund
Risk Return [Abstract]	rr_RiskReturnAbstract
Risk/Return [Heading]	rr_RiskReturnHeading	UBS Global Frontier Fund
Objective [Heading]	rr_ObjectiveHeading	Investment objective
Objective, Primary [Text Block]	rr_ObjectivePrimaryTextBlock	The Fund seeks to obtain superior long-term returns on capital.
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 43 of the Fund's prospectus and in "Reduced sales charges, additional purchase, exchange and redemption information and other services" on page 107 of the Fund's statement of additional information ("SAI").
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)
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 109% of the average value of its portfolio.
Portfolio Turnover, Rate	rr_PortfolioTurnoverRate	109.00%
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 In order to achieve the Fund's investment objective, the Advisor employs an enhancement to its global securities (allocation) strategy ("Global Securities (Allocation) Strategy"). The Advisor's Global Securities (Allocation) Strategy seeks to provide exposure to the major asset classes of the global markets and is currently utilized by other funds and products managed by the Advisor, including the UBS Global Allocation Fund, a series of the Trust, and the UBS Global Securities Relationship Fund, a series of UBS Relationship Funds (the "GSR Fund"). The Advisor enhances its Global Securities (Allocation) Strategy with respect to the Fund by increasing the Fund's exposure to the global markets through the use of leverage to achieve higher returns than the Global Securities (Allocation) Strategy typically with equity-like risk. However, when warranted by market conditions, the Advisor attempts to limit the Fund's equity risk through active asset allocation. The Fund principally invests directly or indirectly in equity and fixed income securities and other financial instruments to gain exposure to issuers located within and outside the United States. In connection with its Global Securities (Allocation) Strategy, under normal circumstances, the Advisor allocates the exposure of the Fund's assets between fixed income securities and equity securities, including securities of issuers in both developed (including the United States) and emerging markets countries. The Fund may invest directly in such securities and financial instruments and/or indirectly in such investments by investing in shares of open-end investment companies ("Underlying Funds"), including open-end investment companies advised by the Advisor. In addition, the Fund increases its exposure to the global markets through the use of leverage. Leverage by the Fund generally is achieved by entering into total return swap agreements with respect to the return of the GSR Fund. Alternatively, the Fund may achieve leverage by engaging in futures contracts with respect to securities or indices. Investments by the Fund or an Underlying Fund in fixed income securities may include, but are not limited to, debt securities of governments throughout the world (including the United States), their agencies and instrumentalities, debt securities of corporations, mortgage-backed securities and asset-backed securities. These securities will have an initial maturity of more than one year and may be either investment grade or high yield (lower-rated or "junk bonds") securities. Investments by the Fund or an Underlying Fund in equity securities may include, but are not limited to, common stock and preferred stock. The Fund may invest in equity securities of issuers in any capitalization range based on market conditions and in accordance with its investment objective. 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, forward agreements, swap agreements (specifically, total return and inflation swaps), equity participation notes and equity linked notes. All of these derivatives may be used for risk management purposes, such as hedging against a specific security or currency (except with respect to equity participation notes and equity linked notes), or to manage or adjust the risk profile of the Fund. In addition, all of the derivative instruments listed above may be used for investment (non-hedging) purposes to earn income; to enhance returns; to replace more traditional direct investments; to obtain exposure to certain markets; or to establish net short positions for individual markets, currencies or securities. Futures on indices and forward agreements may also be used to adjust the Fund's portfolio duration. In particular, the Fund may seek to increase its exposure to the global markets through the use of leverage by investing in total return swap agreements with respect to the return of the GSR Fund. As an alternative to investing in total return swap agreements based on the return of the GSR Fund, the Fund may also leverage by borrowing from banks to the extent permitted by the Investment Company Act of 1940, as amended (the "1940 Act"), to invest additional assets in the global markets by investing the borrowed assets in the GSR Fund. The use of leverage by the Fund through total return swaps, futures contracts or borrowing is permitted to range between 0% to 50% of the Fund's total assets (including amounts borrowed), but typically ranges between 25% to 40% of the Fund's total assets (including amounts borrowed). Management process The Fund is a multi-asset fund managed in accordance with the Advisor's Global Securities (Allocation) Strategy. Asset allocation decisions are tactical, based upon the Advisor's assessment of valuations and prevailing market conditions in the United States and abroad. In determining the asset allocation of the Fund, the Advisor may utilize fundamental valuation and market behavior indicators to construct the Fund's portfolio. With respect to the Advisor's selection of specific equity securities for inclusion in the Fund's or an Underlying Fund's equity asset classes, the Advisor may utilize fundamental valuation and growth-oriented strategies. In selecting equity securities for the Fund or an Underlying Fund using the fundamental valuation process, the Advisor selects securities whose fundamental values (the Advisor's assessment of what a security is worth) it believes are greater than what is reflected in market prices. A stock with a market price below its assessed fundamental value would be considered for inclusion in the Fund's or an Underlying Fund's portfolio. Under certain circumstances the Advisor also may utilize a growth-oriented strategy within its equity asset classes. In selecting growth equities, the Advisor seeks to invest in companies that possess a dominant market position and franchise, a major technological edge or a unique competitive advantage. The Advisor's fixed income strategy combines judgments about the absolute value of the fixed income universe and the relative value of issuer sectors, maturity intervals, security durations, credit qualities and coupon segments, as well as specific circumstances facing the issuers of fixed income securities. The Fund's and the Underlying Funds' risks are carefully monitored with consideration given to the risk generated by individual position, sector, country and currency views. The Advisor enhances its Global Securities (Allocation) Strategy with respect to the Fund by increasing the Fund's exposure to the global markets through the use of leverage. The Advisor's employment of leverage mechanisms with respect to the Fund's portfolio is based on the belief that, in conventional portfolio management, increasing a portfolio's long-term expected return entails adding riskier equity-like assets and reducing the allocation to lower-risk fixed income investments. The Advisor seeks to step beyond this framework to provide higher risk-adjusted returns than the Global Securities (Allocation) Strategy by employing leverage through investing in total return swaps based on the return of the GSR Fund, engaging in futures contracts with respect to securities or indices, or borrowing from banks to the extent permitted by the 1940 Act to purchase additional shares of the GSR Fund to increase the Fund's risk and return in an efficient manner.
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. Investing in other funds risks: The Fund's investment performance is affected by the investment performance of the Underlying Funds in which the Fund may invest. Through its investment in the Underlying Funds, the Fund is subject to the risks of the Underlying Funds' investments and subject to the Underlying Funds' expenses. Market risk: The risk that 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. Interest rate risk: An increase in prevailing interest rates typically causes the value of fixed income securities to fall. Changes in interest rates will likely affect the value of longer-duration fixed income securities more than shorter-duration securities and higher quality securities more than lower quality securities. When interest rates are falling, some fixed income securities provide that the issuer may repay them earlier than the maturity date, and if this occurs the Fund may have to reinvest these repayments at lower interest rates. Government securities risk: There are different types of US government securities with different levels of credit risk, including 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. Credit risk: The risk that the Fund could lose money if the issuer or guarantor of a fixed income security, or the counterparty to or guarantor of a derivative contract, is unable or unwilling to meet its financial obligations. This risk is likely greater for lower quality investments than for investments that are higher quality. High yield bond risk: The risk that the issuer of bonds with ratings of BB (Standard & Poor's Ratings Group ("S&P")) or Ba (Moody's Investors Service, Inc. ("Moody's")) or below, or deemed of equivalent quality, will default or otherwise be unable to honor a financial obligation (also known as lower-rated or "junk bonds"). These securities are considered to be predominately speculative with respect to an issuer's capacity to pay interest and repay principal in accordance with the terms of the obligations. Lower-quality bonds are more likely to be subject to an issuer's default or downgrade than investment grade (higher-quality) bonds. 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. 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. Investments in foreign government bonds involve special risks because the Fund may have limited legal recourse in the event of default. Also, foreign securities are sometimes less liquid and more difficult to sell and to value than securities of US issuers. These risks are greater for investments in emerging market issuers. In addition, investments in emerging market issuers may decline in value because of unfavorable foreign government actions, greater risks of political instability or the absence of accurate information about emerging market issuers. Asset allocation risk: The risk that the Fund may allocate assets to an asset category that performs poorly relative to other asset categories. 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. Derivatives relating to fixed income markets are especially susceptible to interest rate risk and credit risk. In addition, many types of swaps and other 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. Leverage risk associated with borrowing: The Fund may borrow money from banks to purchase investments for the Fund, which is a form of leverage. If the Fund borrows money to purchase securities and the Fund's investments decrease in value, the Fund's losses will be greater than if the Fund did not borrow money for investment purposes. In addition, if the return on an investment purchased with borrowed funds is not sufficient to cover the cost of borrowing, then the net income of the Fund would be less than if borrowing were not used. Management risk: The risk that the investment strategies, techniques and risk analyses employed by the Advisor may not produce the desired results.
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. The GSMI Mutual Fund Index shows how the Fund's performance compares to an index compiled by the Advisor that is constructed as follows: 65% MSCI All Country World Index (net), 15% Citigroup World Government Bond ex US Index, 15% Citigroup US Government Bond Index, 2% J.P. Morgan Emerging Markets Bond Index Global (EMBI Global) and 3% BofA Merrill Lynch US High Yield Cash Pay Constrained Index. Life of class performance for the MSCI World Free Index (net) and the GSMI Mutual Fund Index is as of the inception month end. Indices reflect no deduction for fees, expenses or taxes, except for the MSCI World Free Index (net) which reflects no deduction for fees and expenses. 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 Returns [Text]	rr_PerformanceInformationIllustratesVariabilityOfReturns	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.
Performance Availability Website Address [Text]	rr_PerformanceAvailabilityWebSiteAddress	http://globalam-us.ubs.com/corpweb/performance.do
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	UBS Global Frontier Fund Annual Total Returns of Class Y Shares (2008 is the Fund's first full year of operations)
Bar Chart Closing [Text Block]	rr_BarChartClosingTextBlock	Total return January 1 - September 30, 2012: 12.67% Best quarter during calendar years shown-2Q 2009: 33.02% Worst quarter during calendar years shown-4Q 2008: (29.77)%
Index No Deduction for Fees, Expenses, Taxes [Text]	rr_IndexNoDeductionForFeesExpensesTaxes	Indices reflect no deduction for fees, expenses or taxes, except for the MSCI World Free Index (net) which reflects no deduction for fees and expenses.
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	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 Y shares' after-tax returns shown.
Caption	rr_AverageAnnualReturnCaption	Average annual total returns (for the periods ended December 31, 2011)
UBS Global Frontier Fund (Prospectus Summary) | UBS Global Frontier Fund | GSMI Mutual Fund Index
Risk Return [Abstract]	rr_RiskReturnAbstract
Label	rr_AverageAnnualReturnLabel	GSMI Mutual Fund Index
1 Year	rr_AverageAnnualReturnYear01	(2.14%)
Since Inception	rr_AverageAnnualReturnSinceInception	0.67%
UBS Global Frontier Fund (Prospectus Summary) | UBS Global Frontier Fund | MSCI World Free ex USA Index (net)
Risk Return [Abstract]	rr_RiskReturnAbstract
Label	rr_AverageAnnualReturnLabel	MSCI World Free Index (net)
1 Year	rr_AverageAnnualReturnYear01	(5.54%)
Since Inception	rr_AverageAnnualReturnSinceInception	(4.10%)
UBS Global Frontier Fund (Prospectus Summary) | UBS Global Frontier Fund | Class A
Risk Return [Abstract]	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_MaximumDeferredSalesChargeOverOfferingPrice	none	[1]
Redemption fee (as a % of amount redeemed within 90 days of purchase, if applicable)	rr_RedemptionFeeOverRedemption	(1.00%)
Management fees	rr_ManagementFeesOverAssets	0.95%
Distribution and/or service (12b-1) fees	rr_DistributionAndService12b1FeesOverAssets	0.25%
Other expenses	rr_OtherExpensesOverAssets	0.53%
Acquired fund fees and expenses	rr_AcquiredFundFeesAndExpensesOverAssets	0.12%
Total annual fund operating expenses	rr_ExpensesOverAssets	1.85%	[2]
Less management fee waiver/expense reimbursements	rr_FeeWaiverOrReimbursementOverAssets	(0.33%)
Total annual fund operating expenses after management fee waiver/expense reimbursements	rr_NetExpensesOverAssets	1.52%	[2],[3]
Fee Waiver or Reimbursement over Assets, Date of Termination	rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination	2013-10-28
Expense Example, with Redemption, 1 Year	rr_ExpenseExampleYear01	696
Expense Example, with Redemption, 3 Years	rr_ExpenseExampleYear03	1,069
Expense Example, with Redemption, 5 Years	rr_ExpenseExampleYear05	1,467
Expense Example, with Redemption, 10 Years	rr_ExpenseExampleYear10	2,574
Label	rr_AverageAnnualReturnLabel	Class A Return before taxes
1 Year	rr_AverageAnnualReturnYear01	(15.26%)
Since Inception	rr_AverageAnnualReturnSinceInception	(6.27%)
Inception Date	rr_AverageAnnualReturnInceptionDate	Jul. 26, 2007
UBS Global Frontier Fund (Prospectus Summary) | UBS Global Frontier Fund | Class C
Risk Return [Abstract]	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	1.00%
Redemption fee (as a % of amount redeemed within 90 days of purchase, if applicable)	rr_RedemptionFeeOverRedemption	(1.00%)
Management fees	rr_ManagementFeesOverAssets	0.95%
Distribution and/or service (12b-1) fees	rr_DistributionAndService12b1FeesOverAssets	1.00%
Other expenses	rr_OtherExpensesOverAssets	0.56%
Acquired fund fees and expenses	rr_AcquiredFundFeesAndExpensesOverAssets	0.12%
Total annual fund operating expenses	rr_ExpensesOverAssets	2.63%	[2]
Less management fee waiver/expense reimbursements	rr_FeeWaiverOrReimbursementOverAssets	(0.36%)
Total annual fund operating expenses after management fee waiver/expense reimbursements	rr_NetExpensesOverAssets	2.27%	[2],[3]
Fee Waiver or Reimbursement over Assets, Date of Termination	rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination	2013-10-28
Expense Example, with Redemption, 1 Year	rr_ExpenseExampleYear01	330
Expense Example, with Redemption, 3 Years	rr_ExpenseExampleYear03	783
Expense Example, with Redemption, 5 Years	rr_ExpenseExampleYear05	1,363
Expense Example, with Redemption, 10 Years	rr_ExpenseExampleYear10	2,937
Expense Example, No Redemption, 1 Year	rr_ExpenseExampleNoRedemptionYear01	230
Expense Example, No Redemption, 3 Years	rr_ExpenseExampleNoRedemptionYear03	783
Expense Example, No Redemption, 5 Years	rr_ExpenseExampleNoRedemptionYear05	1,363
Expense Example, No Redemption, 10 Years	rr_ExpenseExampleNoRedemptionYear10	2,937
Label	rr_AverageAnnualReturnLabel	Class C Return before taxes
1 Year	rr_AverageAnnualReturnYear01	(11.87%)
Since Inception	rr_AverageAnnualReturnSinceInception	(5.76%)
Inception Date	rr_AverageAnnualReturnInceptionDate	Jul. 26, 2007
UBS Global Frontier Fund (Prospectus Summary) | UBS Global Frontier Fund | Class Y
Risk Return [Abstract]	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 fees	rr_ManagementFeesOverAssets	0.95%
Distribution and/or service (12b-1) fees	rr_DistributionAndService12b1FeesOverAssets	none
Other expenses	rr_OtherExpensesOverAssets	0.56%
Acquired fund fees and expenses	rr_AcquiredFundFeesAndExpensesOverAssets	0.12%
Total annual fund operating expenses	rr_ExpensesOverAssets	1.63%	[2]
Less management fee waiver/expense reimbursements	rr_FeeWaiverOrReimbursementOverAssets	(0.36%)
Total annual fund operating expenses after management fee waiver/expense reimbursements	rr_NetExpensesOverAssets	1.27%	[2],[3]
Fee Waiver or Reimbursement over Assets, Date of Termination	rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination	2013-10-28
Expense Example, with Redemption, 1 Year	rr_ExpenseExampleYear01	129
Expense Example, with Redemption, 3 Years	rr_ExpenseExampleYear03	479
Expense Example, with Redemption, 5 Years	rr_ExpenseExampleYear05	853
Expense Example, with Redemption, 10 Years	rr_ExpenseExampleYear10	1,903
Annual Return 2008	rr_AnnualReturn2008	(48.40%)
Annual Return 2009	rr_AnnualReturn2009	47.99%
Annual Return 2010	rr_AnnualReturn2010	15.92%
Annual Return 2011	rr_AnnualReturn2011	(10.17%)
Year to Date Return, Label	rr_YearToDateReturnLabel	Total return January 1 - September 30, 2012:
Bar Chart, Year to Date Return, Date	rr_BarChartYearToDateReturnDate	Sep. 30, 2012
Bar Chart, Year to Date Return	rr_BarChartYearToDateReturn	12.67%
Highest Quarterly Return, Label	rr_HighestQuarterlyReturnLabel	Best quarter during calendar years shown-2Q 2009:
Highest Quarterly Return, Date	rr_BarChartHighestQuarterlyReturnDate	Jun. 30, 2009
Highest Quarterly Return	rr_BarChartHighestQuarterlyReturn	33.02%
Lowest Quarterly Return, Label	rr_LowestQuarterlyReturnLabel	Worst quarter during calendar years shown-4Q 2008:
Lowest Quarterly Return, Date	rr_BarChartLowestQuarterlyReturnDate	Dec. 31, 2008
Lowest Quarterly Return	rr_BarChartLowestQuarterlyReturn	(29.77%)
Label	rr_AverageAnnualReturnLabel	Class Y Return before taxes
1 Year	rr_AverageAnnualReturnYear01	(10.17%)
Since Inception	rr_AverageAnnualReturnSinceInception	(4.82%)
Inception Date	rr_AverageAnnualReturnInceptionDate	Jul. 26, 2007
UBS Global Frontier Fund (Prospectus Summary) | UBS Global Frontier Fund | Class Y | After Taxes on Distributions
Risk Return [Abstract]	rr_RiskReturnAbstract
Label	rr_AverageAnnualReturnLabel	Class Y Return after taxes on distributions
1 Year	rr_AverageAnnualReturnYear01	(11.69%)
Since Inception	rr_AverageAnnualReturnSinceInception	(5.82%)
Inception Date	rr_AverageAnnualReturnInceptionDate	Jul. 26, 2007
UBS Global Frontier Fund (Prospectus Summary) | UBS Global Frontier Fund | Class Y | After Taxes on Distributions and Sales
Risk Return [Abstract]	rr_RiskReturnAbstract
Label	rr_AverageAnnualReturnLabel	Class Y Return after taxes on distributions and sale of fund shares
1 Year	rr_AverageAnnualReturnYear01	(6.37%)
Since Inception	rr_AverageAnnualReturnSinceInception	(4.48%)
Inception Date	rr_AverageAnnualReturnInceptionDate	Jul. 26, 2007

[1] 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.

[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, and 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, and dividend expense and security loan fees for securities sold short), through the period ending October 28, 2013, do not exceed 1.40% for Class A 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. 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, the UBS Global AM (Americas)'s three year recoupment rights will survive.

XML

Label	Element	Value
Risk Return [Abstract]	rr_RiskReturnAbstract
ProspectusDate	rr_ProspectusDate	Oct. 29, 2012
UBS International Equity Fund (Prospectus Summary) | UBS International Equity Fund
Risk Return [Abstract]	rr_RiskReturnAbstract
Risk/Return [Heading]	rr_RiskReturnHeading	UBS International 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 by investing primarily in the equity securities of non-US issuers.
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 37 of the Fund's prospectus and in "Reduced sales charges, additional purchase, exchange and redemption information and other services" on page 107 of the Fund's statement of additional information ("SAI").
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)
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 49% of the average value of its portfolio.
Portfolio Turnover, Rate	rr_PortfolioTurnoverRate	49.00%
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 irrevocable fee waiver and expense reimbursement for all years. 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 Under normal circumstances, the Fund invests at least 80% of its net assets (plus borrowings for investment purposes, if any) in equity securities. Investments in equity securities may include, but are not limited to, dividend-paying securities, common stock and preferred stock of issuers located throughout the world. The Fund may invest in issuers from both developed and emerging markets. The Advisor, on behalf of the Fund, intends to diversify broadly among countries, but reserves the right to invest a substantial portion of the Fund's assets in one or more countries if economic and business conditions warrant such investments. The Fund may invest in stocks of companies of any size. 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, forward currency agreements and equity participation notes. All of 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, all of the derivative instruments listed above may be used for investment (non-hedging) purposes to earn income; to enhance returns; to replace more traditional direct investments (except for forward currency agreements); to obtain exposure to certain markets; or to establish net short positions for individual currencies (except for equity participation notes). Management process The Advisor's investment decisions with respect to a portion of the Fund's portfolio are based upon price/value discrepancies as identified by the Advisor's fundamental valuation process. The Advisor utilizes growth-oriented strategies with respect to the remainder of the Fund's portfolio. In selecting securities for the portion of the Fund that is managed according to the Advisor's fundamental valuation process, 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 country, 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 across industries and countries with attractive relative price/value characteristics. With respect to the portion of the Fund's portfolio that is managed according to the Advisor's growth-oriented strategies, the Advisor seeks to invest in companies which are undergoing positive sustainable fundamental change driving a period of above average earnings growth. Hallmarks of such companies include a dominant market position and franchise, major technological edge or unique competitive advantage. In selecting securities with this strategy, the Advisor selects companies it believes can sustain an above average return on invested capital and over a longer period of time than is reflected in current market prices.
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.    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. These risks are greater for investments in emerging market issuers. In addition, investments in emerging market issuers may decline in value because of unfavorable foreign government actions, greater risks of political instability or the absence of accurate information about emerging market issuers. Management risk: The risk that the investment strategies, techniques and risk analyses employed by the Advisor may not produce the desired results. 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. 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.
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. Life of class performance for the index is as of the inception month-end of each class. Index reflects no deduction for fees and expenses. 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 Returns [Text]	rr_PerformanceInformationIllustratesVariabilityOfReturns	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.
Performance Availability Website Address [Text]	rr_PerformanceAvailabilityWebSiteAddress	http://globalam-us.ubs.com/corpweb/performance.do
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	UBS International Equity Fund Annual Total Returns of Class Y Shares
Bar Chart Closing [Text Block]	rr_BarChartClosingTextBlock	Total return January 1 - September 30, 2012: 11.50% Best quarter during calendar years shown-2Q 2009: 29.94% Worst quarter during calendar years shown-3Q 2011: (23.88)%
Index No Deduction for Fees, Expenses, Taxes [Text]	rr_IndexNoDeductionForFeesExpensesTaxes	Index reflects no deduction for fees and expenses.
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	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 Y shares' after-tax returns shown.
Caption	rr_AverageAnnualReturnCaption	Average annual total returns (for the periods ended December 31, 2011)
UBS International Equity Fund (Prospectus Summary) | UBS International Equity Fund | MSCI World Free ex USA Index (net)
Risk Return [Abstract]	rr_RiskReturnAbstract
Label	rr_AverageAnnualReturnLabel	MSCI World Free ex USA Index (net)
1 Year	rr_AverageAnnualReturnYear01	(12.21%)
5 Years	rr_AverageAnnualReturnYear05	(4.09%)
10 Years	rr_AverageAnnualReturnYear10	5.14%
Since Inception	rr_AverageAnnualReturnSinceInception		[1]
UBS International Equity Fund (Prospectus Summary) | UBS International Equity Fund | Class A
Risk Return [Abstract]	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_MaximumDeferredSalesChargeOverOfferingPrice	none	[2]
Redemption fee (as a % of amount redeemed within 90 days of purchase, if applicable)	rr_RedemptionFeeOverRedemption	(1.00%)
Management fees	rr_ManagementFeesOverAssets	0.80%
Distribution and/or service (12b-1) fees	rr_DistributionAndService12b1FeesOverAssets	0.25%
Other expenses	rr_OtherExpensesOverAssets	1.23%	[3]
Total annual fund operating expenses	rr_ExpensesOverAssets	2.28%
Less management fee waiver/expense reimbursements	rr_FeeWaiverOrReimbursementOverAssets	(1.03%)
Total annual fund operating expenses after management fee waiver/expense reimbursements	rr_NetExpensesOverAssets	1.25%	[4]
Expense Example, with Redemption, 1 Year	rr_ExpenseExampleYear01	670
Expense Example, with Redemption, 3 Years	rr_ExpenseExampleYear03	925
Expense Example, with Redemption, 5 Years	rr_ExpenseExampleYear05	1,199
Expense Example, with Redemption, 10 Years	rr_ExpenseExampleYear10	1,978
Label	rr_AverageAnnualReturnLabel	Class A Return before taxes
1 Year	rr_AverageAnnualReturnYear01	(22.50%)
5 Years	rr_AverageAnnualReturnYear05	(6.09%)
10 Years	rr_AverageAnnualReturnYear10	2.66%
Since Inception	rr_AverageAnnualReturnSinceInception	1.42%
Inception Date	rr_AverageAnnualReturnInceptionDate	Jun. 30, 1997
UBS International Equity Fund (Prospectus Summary) | UBS International Equity Fund | Class C
Risk Return [Abstract]	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	1.00%
Redemption fee (as a % of amount redeemed within 90 days of purchase, if applicable)	rr_RedemptionFeeOverRedemption	(1.00%)
Management fees	rr_ManagementFeesOverAssets	0.80%
Distribution and/or service (12b-1) fees	rr_DistributionAndService12b1FeesOverAssets	1.00%
Other expenses	rr_OtherExpensesOverAssets	1.26%	[3]
Total annual fund operating expenses	rr_ExpensesOverAssets	3.06%
Less management fee waiver/expense reimbursements	rr_FeeWaiverOrReimbursementOverAssets	(1.06%)
Total annual fund operating expenses after management fee waiver/expense reimbursements	rr_NetExpensesOverAssets	2.00%	[4]
Expense Example, with Redemption, 1 Year	rr_ExpenseExampleYear01	303
Expense Example, with Redemption, 3 Years	rr_ExpenseExampleYear03	627
Expense Example, with Redemption, 5 Years	rr_ExpenseExampleYear05	1,078
Expense Example, with Redemption, 10 Years	rr_ExpenseExampleYear10	2,327
Expense Example, No Redemption, 1 Year	rr_ExpenseExampleNoRedemptionYear01	203
Expense Example, No Redemption, 3 Years	rr_ExpenseExampleNoRedemptionYear03	627
Expense Example, No Redemption, 5 Years	rr_ExpenseExampleNoRedemptionYear05	1,078
Expense Example, No Redemption, 10 Years	rr_ExpenseExampleNoRedemptionYear10	2,327
Label	rr_AverageAnnualReturnLabel	Class C Return before taxes	[5]
1 Year	rr_AverageAnnualReturnYear01	(19.45%)
5 Years	rr_AverageAnnualReturnYear05	(5.75%)
10 Years	rr_AverageAnnualReturnYear10
Since Inception	rr_AverageAnnualReturnSinceInception	2.85%
Inception Date	rr_AverageAnnualReturnInceptionDate	Jan. 25, 2002
UBS International Equity Fund (Prospectus Summary) | UBS International Equity Fund | Class Y
Risk Return [Abstract]	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 fees	rr_ManagementFeesOverAssets	0.80%
Distribution and/or service (12b-1) fees	rr_DistributionAndService12b1FeesOverAssets	none
Other expenses	rr_OtherExpensesOverAssets	1.26%	[3]
Total annual fund operating expenses	rr_ExpensesOverAssets	2.06%
Less management fee waiver/expense reimbursements	rr_FeeWaiverOrReimbursementOverAssets	(1.06%)
Total annual fund operating expenses after management fee waiver/expense reimbursements	rr_NetExpensesOverAssets	1.00%	[4]
Expense Example, with Redemption, 1 Year	rr_ExpenseExampleYear01	102
Expense Example, with Redemption, 3 Years	rr_ExpenseExampleYear03	318
Expense Example, with Redemption, 5 Years	rr_ExpenseExampleYear05	552
Expense Example, with Redemption, 10 Years	rr_ExpenseExampleYear10	1,225
Annual Return 2002	rr_AnnualReturn2002	(14.12%)
Annual Return 2003	rr_AnnualReturn2003	31.66%
Annual Return 2004	rr_AnnualReturn2004	17.25%
Annual Return 2005	rr_AnnualReturn2005	9.69%
Annual Return 2006	rr_AnnualReturn2006	23.78%
Annual Return 2007	rr_AnnualReturn2007	8.38%
Annual Return 2008	rr_AnnualReturn2008	(44.09%)
Annual Return 2009	rr_AnnualReturn2009	39.65%
Annual Return 2010	rr_AnnualReturn2010	12.39%
Annual Return 2011	rr_AnnualReturn2011	(17.79%)
Year to Date Return, Label	rr_YearToDateReturnLabel	Total return January 1 - September 30, 2012:
Bar Chart, Year to Date Return, Date	rr_BarChartYearToDateReturnDate	Sep. 30, 2012
Bar Chart, Year to Date Return	rr_BarChartYearToDateReturn	11.50%
Highest Quarterly Return, Label	rr_HighestQuarterlyReturnLabel	Best quarter during calendar years shown-2Q 2009:
Highest Quarterly Return, Date	rr_BarChartHighestQuarterlyReturnDate	Sep. 30, 2009
Highest Quarterly Return	rr_BarChartHighestQuarterlyReturn	29.94%
Lowest Quarterly Return, Label	rr_LowestQuarterlyReturnLabel	Worst quarter during calendar years shown-3Q 2011:
Lowest Quarterly Return, Date	rr_BarChartLowestQuarterlyReturnDate	Sep. 30, 2011
Lowest Quarterly Return	rr_BarChartLowestQuarterlyReturn	(23.88%)
Label	rr_AverageAnnualReturnLabel	Class Y Return before taxes
1 Year	rr_AverageAnnualReturnYear01	(17.79%)
5 Years	rr_AverageAnnualReturnYear05	(4.80%)
10 Years	rr_AverageAnnualReturnYear10	3.48%
Since Inception	rr_AverageAnnualReturnSinceInception	3.69%
Inception Date	rr_AverageAnnualReturnInceptionDate	Aug. 31, 1993
UBS International Equity Fund (Prospectus Summary) | UBS International Equity Fund | Class Y | After Taxes on Distributions
Risk Return [Abstract]	rr_RiskReturnAbstract
Label	rr_AverageAnnualReturnLabel	Class Y Return after taxes on distributions
1 Year	rr_AverageAnnualReturnYear01	(17.98%)
5 Years	rr_AverageAnnualReturnYear05	(5.95%)
10 Years	rr_AverageAnnualReturnYear10	2.45%
Since Inception	rr_AverageAnnualReturnSinceInception	2.36%
Inception Date	rr_AverageAnnualReturnInceptionDate	Aug. 31, 1993
UBS International Equity Fund (Prospectus Summary) | UBS International Equity Fund | Class Y | After Taxes on Distributions and Sales
Risk Return [Abstract]	rr_RiskReturnAbstract
Label	rr_AverageAnnualReturnLabel	Class Y Return after taxes on distributions and sale of fund shares
1 Year	rr_AverageAnnualReturnYear01	(11.06%)
5 Years	rr_AverageAnnualReturnYear05	(4.13%)
10 Years	rr_AverageAnnualReturnYear10	2.83%
Since Inception	rr_AverageAnnualReturnSinceInception	2.71%
Inception Date	rr_AverageAnnualReturnInceptionDate	Aug. 31, 1993

[1] Average annual total returns for the MSCI World Free ex USA Index (net) for the life of each class were as follows: Class A-3.16%; Class C-5.74%; Class Y-4.41%.

[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] UBS Global Asset Management (Americas) Inc., the Fund's investment advisor ("UBS Global AM (Americas)" or the "Advisor"), has agreed irrevocably to waive its fees and reimburse certain expenses (excluding expenses incurred through investment in other investment companies, interest, taxes, brokerage commissions and extraordinary expenses) so that the Fund's ordinary operating expenses (excluding expenses incurred through investment in other investment companies, interest, taxes, brokerage commissions and extraordinary expenses) do not exceed 1.25% for Class A shares, 2.00% for Class C shares and 1.00% for Class Y shares.

[5] 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.

XML

Label	Element	Value
Risk Return [Abstract]	rr_RiskReturnAbstract
ProspectusDate	rr_ProspectusDate	Oct. 29, 2012
UBS Dynamic Alpha Fund (Prospectus Summary) | UBS Dynamic Alpha Fund
Risk Return [Abstract]	rr_RiskReturnAbstract
Risk/Return [Heading]	rr_RiskReturnHeading	UBS Dynamic Alpha 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 43 of the Fund's prospectus and in "Reduced sales charges, additional purchase, exchange and redemption information and other services" on page 107 of the Fund's statement of additional information ("SAI").
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)
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 164% of the average value of its portfolio.
Portfolio Turnover, Rate	rr_PortfolioTurnoverRate	164.00%
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 The Fund invests in securities and financial instruments to gain exposure to global equity, global fixed income and cash equivalent markets, including global currencies. The Fund may invest in equity and fixed income securities of issuers located within and outside the United States or in open-end investment companies advised by the Advisor, to gain exposure to certain global equity and global fixed income markets. The Fund is a non-diversified fund. Investments in fixed income securities may include, but are not limited to, debt securities of governments throughout the world (including the United States), their agencies and instrumentalities, debt securities of corporations and supranationals, inflation protected securities, convertible bonds, mortgage-backed securities, asset-backed securities, equipment trusts and other collateralized debt securities. Investments in fixed income securities may include issuers in both developed (including the United States) and emerging markets. The Fund's fixed income investments may reflect a broad range of investment maturities, credit qualities and sectors, including high yield (lower-rated or "junk bonds") securities and convertible debt securities. Investments in equity securities may include, but are not limited to, common stock and preferred stock of issuers in developed nations (including the United States) and emerging markets. Equity investments may include securities of companies of any capitalization size. In addition, the Fund attempts to generate positive returns and manage risk through asset allocation and sophisticated currency management techniques. These decisions are integrated with analysis of global market and economic conditions. 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 options (on securities, indices, or swap agreements), futures, forward agreements, swap agreements (specifically, interest rate, total return, currency and credit default swaps), credit-linked securities, equity participation notes and equity linked notes. All of these derivatives may be used for risk management purposes, such as hedging against a specific security or currency, or to manage or adjust the risk profile of the Fund. In addition, all of the derivative instruments listed above may be used for investment (non-hedging) purposes to earn income; to enhance returns; to replace more traditional direct investments; to obtain exposure to certain markets; or to establish net short positions for individual markets, currencies or securities. Options on indices, futures on indices, forward agreements, interest rate swaps, total return swaps, credit default swaps and credit-linked securities may also be used to adjust the Fund's portfolio duration. Any of the derivatives listed above may be used to achieve a negative portfolio duration. Under certain market conditions, the Fund may invest in companies at the time of their initial public offering ("IPO"). To the extent permitted by the Investment Company Act of 1940, as amended (the "1940 Act"), the Fund may borrow money from banks to purchase investments for the Fund. Management process The Fund is a multi-asset fund. Asset allocation decisions are tactical, based upon the Advisor's assessment of valuations and prevailing market conditions in the United States and abroad. In determining the asset allocation of the Fund, the Advisor may utilize fundamental valuation and market behavior indicators to construct the Fund's portfolio. With respect to the Advisor's selection of specific equity securities for inclusion in the Fund's equity asset classes, the Advisor may utilize fundamental valuation, growth-oriented and quantitative research strategies. In selecting equity securities for the Fund using the fundamental valuation process, the Advisor selects securities whose fundamental values (the Advisor's assessment of what a security is worth) it believes are greater than what is reflected in market prices. A stock with a market price below its assessed fundamental value would be considered a long candidate for inclusion in the Fund's portfolio. A stock with a market price above its assessed fundamental value would be considered a short candidate for inclusion in the Fund's portfolio. Under certain circumstances the Advisor also may utilize growth-oriented strategies within its equity asset classes for a portion of the allocation. In selecting growth equities, the Advisor seeks to invest in companies that possess a dominant market position and franchise, a major technological edge or a unique competitive advantage. To make investment decisions for certain equity asset classes, the Advisor utilizes quantitative research techniques that identify investment opportunities by systematically exploring many small reappearing market anomalies to attempt to provide consistent excess returns for the Fund. The Advisor's fixed income strategy combines judgments about the absolute value of the fixed income universe and the relative value of issuer sectors, maturity intervals, security durations, credit qualities and coupon segments, as well as specific circumstances facing the issuers of fixed income securities. In employing its investment strategies for the Fund, the Advisor attempts to achieve a total rate of return for the Fund that meets or exceeds 5% per year on a real (i.e., inflation-adjusted) basis and net of management fees over rolling five year time horizons. The Advisor does not represent or guarantee that the Fund will meet this total return goal.
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. Interest rate risk: An increase in prevailing interest rates typically causes the value of fixed income securities to fall. Changes in interest rates will likely affect the value of longer-duration fixed income securities more than shorter-duration securities and higher quality securities more than lower quality securities. When interest rates are falling, some fixed income securities provide that the issuer may repay them earlier than the maturity date, and if this occurs the Fund may have to reinvest these repayments at lower interest rates. Credit risk: The risk that the Fund could lose money if the issuer or guarantor of a fixed income security, or the counterparty to or guarantor of a derivative contract, is unable or unwilling to meet its financial obligations. This risk is likely greater for lower quality investments than for investments that are higher quality. High yield bond risk: The risk that the issuer of bonds with ratings of BB (Standard & Poor's Ratings Group ("S&P")) or Ba (Moody's Investors Service, Inc. ("Moody's")) or below, or deemed of equivalent quality, will default or otherwise be unable to honor a financial obligation (also known as lower-rated or "junk bonds"). These securities are considered to be predominately speculative with respect to an issuer's capacity to pay interest and repay principal in accordance with the terms of the obligations. Lower-quality bonds are more likely to be subject to an issuer's default or downgrade than investment grade (higher-quality) bonds. Government securities risk: There are different types of US government securities with different levels of credit risk, including 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. Market risk: The risk that 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. 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. 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. Investments in foreign government bonds involve special risks because the Fund may have limited legal recourse in the event of default. Also, foreign securities are sometimes less liquid and more difficult to sell and to value than securities of US issuers. These risks are greater for investments in emerging market issuers. In addition, investments in emerging market issuers may decline in value because of unfavorable foreign government actions, greater risks of political instability or the absence of accurate information about emerging market issuers. Asset allocation risk: The risk that the Fund may allocate assets to an asset category that performs poorly relative to other asset categories. Non-diversification risk: The Fund is a non-diversified investment company, which means that the Fund may invest more of its assets in a smaller number of issuers than a diversified investment company. As a non-diversified fund, the Fund's share price may be more volatile and the Fund has a greater potential to realize losses upon the occurrence of adverse events affecting a particular issuer. 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. Derivatives relating to fixed income markets are especially susceptible to interest rate risk and credit risk. In addition, many types of swaps and other 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. Leverage risk associated with borrowing: The Fund may borrow money from banks to purchase investments for the Fund, which is a form of leverage. If the Fund borrows money to purchase securities and the Fund's investments decrease in value, the Fund's losses will be greater than if the Fund did not borrow money for investment purposes. In addition, if the return on an investment purchased with borrowed funds is not sufficient to cover the cost of borrowing, then the net income of the Fund would be less than if borrowing were not used. Investing in other funds risks: The Fund's investment performance is affected by the investment performance of the underlying funds in which the Fund may invest. Through its investment in the underlying funds, the Fund is subject to the risks of the underlying funds' investments and subject to the underlying funds' expenses. Management risk: The risk that the investment strategies, techniques and risk analyses employed by the Advisor may not produce the desired results.
Risk Lose Money [Text]	rr_RiskLoseMoney	You may lose money by investing in the Fund.
Risk Nondiversified Status [Text]	rr_RiskNondiversifiedStatus	The Fund is a non-diversified investment company, which means that the Fund may invest more of its assets in a smaller number of issuers than a diversified investment company. As a non-diversified fund, the Fund's share price may be more volatile and the Fund has a greater potential to realize losses upon the occurrence of adverse events affecting a particular issuer.
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. The MSCI World Free Index (net) shows how the Fund's performance compares to an index that is designed to measure the equity market performance of developed markets. The US Consumer Price Index (CPI) shows how the Fund's performance compares to monthly data on changes in the prices paid by urban consumers. Life of class performance for the BofA Merrill Lynch US Treasury 1-5 Year Index, the MSCI World Free Index (net) and the US Consumer Price Index (CPI) is as of the inception month end. Indices reflect no deduction for fees, expenses or taxes, except for the MSCI World Free Index (net) which reflects no deduction for fees and expenses. 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 Returns [Text]	rr_PerformanceInformationIllustratesVariabilityOfReturns	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.
Performance Availability Website Address [Text]	rr_PerformanceAvailabilityWebSiteAddress	http://globalam-us.ubs.com/corpweb/performance.do
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	UBS Dynamic Alpha Fund Annual Total Returns of Class Y Shares (2006 is the fund's first full year of operations)
Bar Chart Closing [Text Block]	rr_BarChartClosingTextBlock	Total return January 1 - September 30, 2012: 10.73% Best quarter during calendar years shown-2Q 2009: 18.12% Worst quarter during calendar years shown-4Q 2008: (17.08)%
Index No Deduction for Fees, Expenses, Taxes [Text]	rr_IndexNoDeductionForFeesExpensesTaxes	Indices reflect no deduction for fees, expenses or taxes, except for the MSCI World Free Index (net) which reflects no deduction for fees and expenses.
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	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 Y shares' after-tax returns shown.
Caption	rr_AverageAnnualReturnCaption	Average annual total returns (for the periods ended December 31, 2011)
UBS Dynamic Alpha Fund (Prospectus Summary) | UBS Dynamic Alpha Fund | MSCI World Free Index (net)
Risk Return [Abstract]	rr_RiskReturnAbstract
Label	rr_AverageAnnualReturnLabel	MSCI World Free Index (net)
1 Year	rr_AverageAnnualReturnYear01	(5.54%)
5 Years	rr_AverageAnnualReturnYear05	(2.37%)
Since Inception	rr_AverageAnnualReturnSinceInception	2.58%
UBS Dynamic Alpha Fund (Prospectus Summary) | UBS Dynamic Alpha Fund | BofA Merrill Lynch US Treasury 1-5 Year Index
Risk Return [Abstract]	rr_RiskReturnAbstract
Label	rr_AverageAnnualReturnLabel	BofA Merrill Lynch US Treasury 1-5 Year Index
1 Year	rr_AverageAnnualReturnYear01	3.36%
5 Years	rr_AverageAnnualReturnYear05	4.77%
Since Inception	rr_AverageAnnualReturnSinceInception	4.20%
UBS Dynamic Alpha Fund (Prospectus Summary) | UBS Dynamic Alpha Fund | US Consumer Price Index (CPI)
Risk Return [Abstract]	rr_RiskReturnAbstract
Label	rr_AverageAnnualReturnLabel	US Consumer Price Index (CPI)
1 Year	rr_AverageAnnualReturnYear01	2.96%
5 Years	rr_AverageAnnualReturnYear05	2.26%
Since Inception	rr_AverageAnnualReturnSinceInception	2.46%
UBS Dynamic Alpha Fund (Prospectus Summary) | UBS Dynamic Alpha Fund | Class A
Risk Return [Abstract]	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_MaximumDeferredSalesChargeOverOfferingPrice	none	[1]
Redemption fee (as a % of amount redeemed within 90 days of purchase, if applicable)	rr_RedemptionFeeOverRedemption	(1.00%)
Management fees	rr_ManagementFeesOverAssets	0.85%
Distribution and/or service (12b-1) fees	rr_DistributionAndService12b1FeesOverAssets	0.25%
Other expenses	rr_OtherExpensesOverAssets	0.31%	[2]
Acquired fund fees and expenses	rr_AcquiredFundFeesAndExpensesOverAssets	0.01%
Total annual fund operating expenses	rr_ExpensesOverAssets	1.42%	[2],[3]
Less management fee waiver/expense reimbursements	rr_FeeWaiverOrReimbursementOverAssets	(0.06%)
Total annual fund operating expenses after management fee waiver/expense reimbursements	rr_NetExpensesOverAssets	1.36%	[2],[3],[4]
Fee Waiver or Reimbursement over Assets, Date of Termination	rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination	2013-10-28
Expense Example, with Redemption, 1 Year	rr_ExpenseExampleYear01	681
Expense Example, with Redemption, 3 Years	rr_ExpenseExampleYear03	969
Expense Example, with Redemption, 5 Years	rr_ExpenseExampleYear05	1,278
Expense Example, with Redemption, 10 Years	rr_ExpenseExampleYear10	2,153
Label	rr_AverageAnnualReturnLabel	Class A Return before taxes
1 Year	rr_AverageAnnualReturnYear01	(7.08%)
5 Years	rr_AverageAnnualReturnYear05	(1.98%)
Since Inception	rr_AverageAnnualReturnSinceInception	0.82%
Inception Date	rr_AverageAnnualReturnInceptionDate	Jan. 27, 2005
UBS Dynamic Alpha Fund (Prospectus Summary) | UBS Dynamic Alpha Fund | Class C
Risk Return [Abstract]	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	1.00%
Redemption fee (as a % of amount redeemed within 90 days of purchase, if applicable)	rr_RedemptionFeeOverRedemption	(1.00%)
Management fees	rr_ManagementFeesOverAssets	0.85%
Distribution and/or service (12b-1) fees	rr_DistributionAndService12b1FeesOverAssets	1.00%
Other expenses	rr_OtherExpensesOverAssets	0.32%	[2]
Acquired fund fees and expenses	rr_AcquiredFundFeesAndExpensesOverAssets	0.01%
Total annual fund operating expenses	rr_ExpensesOverAssets	2.18%	[2],[3]
Less management fee waiver/expense reimbursements	rr_FeeWaiverOrReimbursementOverAssets	(0.07%)
Total annual fund operating expenses after management fee waiver/expense reimbursements	rr_NetExpensesOverAssets	2.11%	[2],[3],[4]
Fee Waiver or Reimbursement over Assets, Date of Termination	rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination	2013-10-28
Expense Example, with Redemption, 1 Year	rr_ExpenseExampleYear01	314
Expense Example, with Redemption, 3 Years	rr_ExpenseExampleYear03	675
Expense Example, with Redemption, 5 Years	rr_ExpenseExampleYear05	1,163
Expense Example, with Redemption, 10 Years	rr_ExpenseExampleYear10	2,508
Expense Example, No Redemption, 1 Year	rr_ExpenseExampleNoRedemptionYear01	214
Expense Example, No Redemption, 3 Years	rr_ExpenseExampleNoRedemptionYear03	675
Expense Example, No Redemption, 5 Years	rr_ExpenseExampleNoRedemptionYear05	1,163
Expense Example, No Redemption, 10 Years	rr_ExpenseExampleNoRedemptionYear10	2,508
Label	rr_AverageAnnualReturnLabel	Class C Return before taxes
1 Year	rr_AverageAnnualReturnYear01	(3.36%)
5 Years	rr_AverageAnnualReturnYear05	(1.63%)
Since Inception	rr_AverageAnnualReturnSinceInception	0.87%
Inception Date	rr_AverageAnnualReturnInceptionDate	Jan. 27, 2005
UBS Dynamic Alpha Fund (Prospectus Summary) | UBS Dynamic Alpha Fund | Class Y
Risk Return [Abstract]	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 fees	rr_ManagementFeesOverAssets	0.85%
Distribution and/or service (12b-1) fees	rr_DistributionAndService12b1FeesOverAssets	none
Other expenses	rr_OtherExpensesOverAssets	0.25%	[2]
Acquired fund fees and expenses	rr_AcquiredFundFeesAndExpensesOverAssets	0.01%
Total annual fund operating expenses	rr_ExpensesOverAssets	1.11%	[2],[3]
Less management fee waiver/expense reimbursements	rr_FeeWaiverOrReimbursementOverAssets	none
Total annual fund operating expenses after management fee waiver/expense reimbursements	rr_NetExpensesOverAssets	1.11%	[2],[3],[4]
Fee Waiver or Reimbursement over Assets, Date of Termination	rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination	2013-10-28
Expense Example, with Redemption, 1 Year	rr_ExpenseExampleYear01	113
Expense Example, with Redemption, 3 Years	rr_ExpenseExampleYear03	353
Expense Example, with Redemption, 5 Years	rr_ExpenseExampleYear05	612
Expense Example, with Redemption, 10 Years	rr_ExpenseExampleYear10	1,352
Annual Return 2006	rr_AnnualReturn2006	7.69%
Annual Return 2007	rr_AnnualReturn2007	(3.59%)
Annual Return 2008	rr_AnnualReturn2008	(21.48%)
Annual Return 2009	rr_AnnualReturn2009	27.33%
Annual Return 2010	rr_AnnualReturn2010	2.22%
Annual Return 2011	rr_AnnualReturn2011	(1.28%)
Year to Date Return, Label	rr_YearToDateReturnLabel	Total return January 1 - September 30, 2012:
Bar Chart, Year to Date Return, Date	rr_BarChartYearToDateReturnDate	Sep. 30, 2012
Bar Chart, Year to Date Return	rr_BarChartYearToDateReturn	10.73%
Highest Quarterly Return, Label	rr_HighestQuarterlyReturnLabel	Best quarter during calendar years shown-2Q 2009:
Highest Quarterly Return, Date	rr_BarChartHighestQuarterlyReturnDate	Jun. 30, 2009
Highest Quarterly Return	rr_BarChartHighestQuarterlyReturn	18.12%
Lowest Quarterly Return, Label	rr_LowestQuarterlyReturnLabel	Worst quarter during calendar years shown-4Q 2008:
Lowest Quarterly Return, Date	rr_BarChartLowestQuarterlyReturnDate	Dec. 31, 2008
Lowest Quarterly Return	rr_BarChartLowestQuarterlyReturn	(17.08%)
Label	rr_AverageAnnualReturnLabel	Class Y Return before taxes
1 Year	rr_AverageAnnualReturnYear01	(1.28%)
5 Years	rr_AverageAnnualReturnYear05	(0.56%)
Since Inception	rr_AverageAnnualReturnSinceInception	1.95%
Inception Date	rr_AverageAnnualReturnInceptionDate	Jan. 27, 2005
UBS Dynamic Alpha Fund (Prospectus Summary) | UBS Dynamic Alpha Fund | Class Y | After Taxes on Distributions
Risk Return [Abstract]	rr_RiskReturnAbstract
Label	rr_AverageAnnualReturnLabel	Class Y Return after taxes on distributions
1 Year	rr_AverageAnnualReturnYear01	(1.28%)
5 Years	rr_AverageAnnualReturnYear05	(2.34%)
Since Inception	rr_AverageAnnualReturnSinceInception	0.60%
Inception Date	rr_AverageAnnualReturnInceptionDate	Jan. 27, 2005
UBS Dynamic Alpha Fund (Prospectus Summary) | UBS Dynamic Alpha Fund | Class Y | After Taxes on Distributions and Sales
Risk Return [Abstract]	rr_RiskReturnAbstract
Label	rr_AverageAnnualReturnLabel	Class Y Return after taxes on distributions and sale of fund shares
1 Year	rr_AverageAnnualReturnYear01	(0.83%)
5 Years	rr_AverageAnnualReturnYear05	(0.89%)
Since Inception	rr_AverageAnnualReturnSinceInception	1.35%
Inception Date	rr_AverageAnnualReturnInceptionDate	Jan. 27, 2005

[1] 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.

[2] "Other expenses" have been restated to eliminate the effect of short sales on expenses since the Fund does not intend to sell securities short. The actual "Other expenses" for the Fund's fiscal year ended June 30, 2012 were 0.50% for Class A shares, 0.51% for Class C shares and 0.43% for Class Y shares. The actual "Total annual fund operating expenses" for the Fund's fiscal year ended June 30, 2012 were 1.61% for Class A shares, 2.37% for Class C shares and 1.29% for Class Y shares. The actual "Total annual fund operating expenses after management fee waiver/expense reimbursements" for the Fund's fiscal year ended June 30, 2012 were 1.55% for Class A shares, 2.30% for Class C shares and 1.29% for Class Y shares.

[3] 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.

[4] 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, and 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, and dividend expense and security loan fees for securities sold short), through the period ending October 28, 2013, do not exceed 1.35% for Class A shares, 2.10% for Class C shares and 1.10% 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. 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, the UBS Global AM (Americas)'s three year recoupment rights will survive.

XML

UBS U.S. Large Cap Equity Fund (Prospectus Summary) | UBS U.S. Large Cap Equity Fund

UBS U.S. Large Cap Equity Fund

Investment objective

The Fund seeks to maximize total return, consisting of capital appreciation and
current income.

Fees and expenses

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 37 of the Fund's
prospectus and in "Reduced sales charges, additional purchase, exchange and
redemption information and other services" on page 107 of the Fund's statement
of additional information ("SAI").

Shareholder fees (fees paid directly from your investment)

Shareholder Fees UBS U.S. Large Cap Equity Fund	Class A		Class C	Class Y
Maximum front-end sales charge (load) imposed on purchases (as a % of offering price)	5.50%		none	none
Maximum contingent deferred sales charge (load) (CDSC) (as a % of purchase or sales price, whichever is less)	none	[1]	1.00%	none
Redemption fee (as a % of amount redeemed within 90 days of purchase, if applicable)	1.00%		1.00%	1.00%

Annual fund operating expenses (expenses that you pay each year as a percentage of the value of your investment)

Annual Fund Operating Expenses UBS U.S. Large Cap Equity Fund		Class A	Class C	Class Y
Management fees		0.70%	0.70%	0.70%
Distribution and/or service (12b-1) fees		0.25%	1.00%	none
Other expenses	[1]	0.29%	0.32%	0.27%
Total annual fund operating expenses		1.24%	2.02%	0.97%
Less management fee waiver/expense reimbursements		0.04%	0.07%	0.02%
Total annual fund operating expenses after management fee waiver/expense reimbursements	[2]	1.20%	1.95%	0.95%

Example

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:

Expense Example UBS U.S. Large Cap Equity Fund (USD $)	Expense Example, with Redemption, 1 Year	Expense Example, with Redemption, 3 Years	Expense Example, with Redemption, 5 Years	Expense Example, with Redemption, 10 Years
Class A	666	918	1,190	1,964
Class C	298	627	1,082	2,342
Class Y	97	307	534	1,188

Expense Example, No Redemption (USD $)	Expense Example, No Redemption, 1 Year	Expense Example, No Redemption, 3 Years	Expense Example, No Redemption, 5 Years	Expense Example, No Redemption, 10 Years
UBS U.S. Large Cap Equity Fund Class C	198	627	1,082	2,342

Portfolio turnover

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 65%
of the average value of its portfolio.

Principal strategies

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
large capitalization companies. The Fund defines large capitalization companies
as those with a market capitalization of at least $3 billion. The Fund may
invest up to 20% of its net assets in the securities of US companies that have
market capitalizations within the range of the Russell 1000 Index but below $3
billion in market capitalization and/or the securities of foreign companies in
developed countries. 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 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.

Management 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.

Main risks

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.

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

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.

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.

Performance

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.

UBS U.S. Large Cap Equity Fund Annual Total Returns Of Class Y Shares

Total return January 1 - September 30, 2012: 12.82%
Best quarter during calendar years shown-2Q 2009: 19.55%
Worst quarter during calendar years shown-4Q 2008: (26.34)%

Average annual total returns (for the periods ended December 31, 2011)

Average Annual Total Returns UBS U.S. Large Cap Equity Fund	Label		1 Year	5 Years	10 Years	Inception Date
Class A	Class A Return before taxes		(8.44%)	(3.93%)	2.17%	Jun. 30, 1997
Class C	Class C Return before taxes	[1]	(4.84%)	(3.56%)	2.00%	Nov. 13, 2001
Class Y	Class Y Return before taxes		(2.83%)	(2.57%)	3.05%	Feb. 22, 1994
After Taxes on Distributions Class Y	Class Y Return after taxes on distributions		(2.98%)	(3.06%)	2.49%	Feb. 22, 1994
After Taxes on Distributions and Sales Class Y	Class Y Return after taxes on distributions and sale of fund shares		(1.66%)	(2.27%)	2.51%	Feb. 22, 1994
Russell 1000 Index	Russell 1000 Index		1.50%	(0.02%)	3.35%

[1] 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.

[1] "Other expenses" include "Acquired fund fees and expenses," which were less than 0.01% of the average net assets of the Fund.

[2] 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 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 28, 2013, do not exceed 1.20% for Class A shares, 1.95% for Class C shares and 0.95% 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. 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, the UBS Global AM (Americas)'s three year recoupment rights will survive.

[1] 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.

XML

Label	Element	Value
Risk Return [Abstract]	rr_RiskReturnAbstract
ProspectusDate	rr_ProspectusDate	Oct. 29, 2012
UBS Multi-Asset Income Fund (Prospectus Summary) | UBS Multi-Asset Income Fund
Risk Return [Abstract]	rr_RiskReturnAbstract
Risk/Return [Heading]	rr_RiskReturnHeading	UBS Multi-Asset Income Fund
Objective [Heading]	rr_ObjectiveHeading	Investment objective
Objective, Primary [Text Block]	rr_ObjectivePrimaryTextBlock	The Fund seeks to provide risk-managed income as its primary objective over the long term.
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 $100,000 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 43 of the Fund's prospectus and in "Reduced sales charges, additional purchase, exchange and redemption information and other services" on page 107 of the Fund's statement of additional information ("SAI").
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)
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. For the period April 25, 2012 through June 30, 2012, the Fund's portfolio turnover rate was 17% of the average value of its portfolio.
Portfolio Turnover, Rate	rr_PortfolioTurnoverRate	17.00%
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 $100,000 in the Fund.
Expense Breakpoint, Minimum Investment Required [Amount]	rr_ExpenseBreakpointMinimumInvestmentRequiredAmount	100,000
Other Expenses, New Fund, Based on Estimates [Text]	rr_OtherExpensesNewFundBasedOnEstimates	"Other expenses" and "Acquired fund fees and expenses" are based on annualized amounts for the Fund's fiscal year ended June 30, 2012.
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 Under normal circumstances, the Fund seeks to provide risk-managed income on a monthly basis by employing an asset allocation strategy that is designed to accommodate the Fund's targeted annual payout percentage. The Fund will allocate its assets by investing in a combination of equities, nominal and inflation-linked fixed income securities, third party exchange-traded funds ("ETFs"), real estate investment trusts ("REITs"), exchange-listed options, and other exchange-traded and over-the-counter ("OTC") derivative securities. The Fund may obtain exposure to fixed income investments by investing in securities directly or by purchasing third-party ETFs that invest in fixed income securities. The Fund's fixed income investments may include debt securities of governments throughout the world (including the United States), their agencies and instrumentalities, debt securities of corporations (including inflation-linked notes and catastrophe bonds), floating rate notes, mortgage-backed securities and asset-backed securities. Catastrophe bonds are types of insurance-linked or event-linked securities that pay off on the occurrence of specific events, usually natural disasters. The third-party ETFs in which the Fund invests could have exposure to senior bank loans. These securities may be either investment grade or high yield (lower-rated or "junk bonds") securities. The Fund may invest without limitation in investment grade debt securities, including corporate debt securities and inflation-linked securities, and may invest up to 50% of its total assets in lower-rated bonds of corporations and up to 20% of its total assets in a combination of other lower-rated bonds, including lower-rated municipal bonds and lower-rated non-US government bonds (including those of emerging markets countries). The Fund may invest in fixed income investments of any maturity. The Fund may obtain exposure to equity investments by investing in securities directly or by purchasing third-party ETFs that invest in equity securities. The Fund may invest up to 50% of its total assets either directly or through investment in ETFs in the common stock and preferred stock of companies in developed countries (including the United States). In addition, the Fund may invest up to 25% of its total assets in real estate securities of US and non-US issuers. Real estate securities may include interests in REITs that own properties or make construction or mortgage loans, securities of companies with substantial real estate holdings and other companies whose products and services are related to the real estate industry, such as building supply manufacturers, mortgage lenders, or mortgage service companies. The Fund's equity investments may include companies and REITs of any market capitalization, including small capitalization (below $3 billion). Within these limitations, the Fund may invest up to 15% of its assets in infrastructure securities and up to 20% of its assets in equity securities of emerging markets issuers. 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 Fund may invest in structured notes in order to generate income for the Fund. The Fund also may write covered call options on ETFs to generate cash flow for the purpose of meeting the Fund's target payment goal, as well as for hedging purposes. Other derivatives in which the Fund may invest include index options, futures, forward agreements and swap agreements (specifically, interest rate, currency and total return swaps). All of these derivatives may be used for risk management purposes, such as hedging against a specific security or currency, or to manage or adjust the risk profile of the Fund. In addition, all of the derivative instruments listed above may be used for investment (non-hedging) purposes to earn income; to enhance returns; to replace more traditional direct investments; to obtain exposure to certain markets; or to establish net short positions for individual markets, currencies or securities. Futures on indices, forward agreements and interest rate swaps may also be used to adjust the Fund's portfolio duration. Management process The Fund seeks to provide diversification across a variety of income producing asset classes in a multi-asset framework. The Fund's asset allocation strategy is designed to accommodate the Fund's targeted annual payout while taking into account the Fund's desired level of capital appreciation. Risk diversification and dynamic distribution between the various asset classes have the objective of creating a more stable capital and income base through various market cycles and interest rate environments. The allocation of investments across asset classes will vary over time and will be driven by: • Valuation based on the Advisor's 30 year fundamental value philosophy; • Economic factors including the current and projected interest rate environment and credit conditions; and • A focus on diversification and risk-management to meet the Fund's payout objective while managing volatility. Under normal or neutral market conditions, the Advisor will allocate approximately 65% of the Fund's total assets to fixed income investments, 20% of the Fund's assets to equity investments of companies in developed (including the United States) or emerging markets countries and 15% of the Fund's assets to US and non-US real estate securities (including REITs). The Fund's asset allocation targets are not fixed which gives the Advisor the flexibility to meet the Fund's investment goal based on market conditions. If warranted by market conditions, the Advisor may invest 100% of the Fund's assets in fixed income investments. In addition, the Fund's allocations to US and non-US equity and real estate securities may be greater or lesser than the allocations described above based on the Advisor's assessment of the markets. The Fund's investment strategy is designed to attempt to achieve a targeted annual payout to investors of 3%-6% based on the current low interest rate environment. By investing in a diversified set of income generating asset classes the Fund seeks to accommodate the Fund's targeted annual payout percentage while managing both capital volatility and yield volatility. Such payout may be comprised of both ordinary income and capital gains. Neither the Fund nor the Advisor represents or guarantees that the Fund will meet this annual payout goal. The Fund intends to make monthly income distribution to shareholders. The amount of monthly distributions may vary from month to month and there is no guarantee that the Fund will be able to make such payments each month.
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. Asset allocation risk: The risk that the Fund may allocate assets to an asset category that performs poorly relative to other asset categories. Market risk: The risk that 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. Interest rate risk: An increase in prevailing interest rates typically causes the value of fixed income securities to fall. Changes in interest rates will likely affect the value of longer-duration fixed income securities more than shorter-duration securities and higher quality securities more than lower quality securities. When interest rates are falling, some fixed income securities provide that the issuer may repay them earlier than the maturity date, and if this occurs the Fund may have to reinvest these repayments at lower interest rates. Credit risk: The risk that the Fund could lose money if the issuer or guarantor of a fixed income security, or the counterparty to or guarantor of a derivative contract, is unable or unwilling to meet its financial obligations. This risk is likely greater for lower quality investments than for investments that are higher quality. High yield bond risk: The risk that the issuer of bonds with ratings of BB (Standard & Poor's Ratings Group ("S&P")) or Ba (Moody's Investors Service, Inc. ("Moody's")) or below, or deemed of equivalent quality, will default or otherwise be unable to honor a financial obligation (also known as lower-rated or "junk bonds"). These securities are considered to be predominately speculative with respect to an issuer's capacity to pay interest and repay principal in accordance with the terms of the obligations. Lower-quality bonds are more likely to be subject to an issuer's default or downgrade than investment grade (higher-quality) bonds. Distribution of income risk: The Fund's monthly income payments will be made from the Fund's interest income, dividends, and currency allocations and will reduce the amount of assets available for investment by the Fund. The Fund's investment losses may reduce the amount of future distributions an investor will receive from the Fund thereby reducing the distribution yield. The dollar amount of the Fund's monthly income payments could vary substantially from one year to the next and over time depending on several factors, including the performance of the financial markets in which the Fund invests, the allocation of Fund assets across different asset classes and investments, the performance of the Fund's underlying strategies, and the amount and timing of prior distributions by the Fund. It is also possible for payments to go down substantially or significantly fluctuate from one year to the next, month over month, and over time depending on the timing of an investor's investments in the Fund. Any redemptions will proportionately reduce the amount of future cash income payments to be received from the Fund. There is no guarantee that the Fund will make monthly income payments to its shareholders or, if made, that the Fund's monthly income payments to shareholders will remain at a fixed amount. Investing in ETFs risks: The Fund's investment in ETFs may subject the Fund to additional risks than if the Fund would have invested directly in the ETF's underlying securities. These risks include the possibility that an ETF may experience a lack of liquidity that can result in greater volatility than its underlying securities; an ETF may trade at a premium or discount to its net asset value; or an ETF may not replicate exactly the performance of the benchmark index it seeks to track. In addition, investing in an ETF may also be more costly than if a Fund had owned the underlying securities directly. The Fund, and indirectly, shareholders of the Fund, bear a proportionate share of the ETF's expenses, which include management and advisory fees and other expenses. In addition, the Fund will pay brokerage commissions in connection with the purchase and sale of shares of ETFs. 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. 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. Investments in foreign government bonds involve special risks because the Fund may have limited legal recourse in the event of default. Also, foreign securities are sometimes less liquid and more difficult to sell and to value than securities of US issuers. These risks are greater for investments in emerging market issuers. In addition, investments in emerging market issuers may decline in value because of unfavorable foreign government actions, greater risks of political instability or the absence of accurate information about emerging market issuers. 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. Real estate securities and REITs: The risk that the Fund's performance will be affected by adverse developments in the real estate industry. Real estate values may be affected by a variety of factors, including: local, national or global economic conditions; changes in zoning or other property-related laws; environmental regulations; interest rates; tax and insurance considerations; overbuilding; property taxes and operating expenses; or declining values in a neighborhood. Similarly, a REIT's performance depends on the types, values, locations and management of the properties it owns. In addition, a REIT may be more susceptible to adverse developments affecting a single project or market segment than a more diversified investment. Loss of status as a qualified REIT under the US federal tax laws could adversely affect the value of a particular REIT or the market for REITs as a whole. 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. Derivatives relating to fixed income markets are especially susceptible to interest rate risk and credit risk. In addition, many types of swaps and other 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. Management risk: The risk that the investment strategies, techniques and risk analyses employed by the Advisor may not produce the desired results.
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	There is no performance information quoted for the Fund as the Fund had not completed a full calendar year of operations as of the date of this prospectus.
Performance One Year or Less [Text]	rr_PerformanceOneYearOrLess	There is no performance information quoted for the Fund as the Fund had not completed a full calendar year of operations as of the date of this prospectus.
UBS Multi-Asset Income Fund (Prospectus Summary) | UBS Multi-Asset Income Fund | Class A
Risk Return [Abstract]	rr_RiskReturnAbstract
Maximum front-end sales charge (load) imposed on purchases (as a % of offering price)	rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice	4.50%
Maximum contingent deferred sales charge (load) (CDSC) (as a % of purchase or sales price, whichever is less)	rr_MaximumDeferredSalesChargeOverOfferingPrice	none	[1]
Redemption fee (as a % of amount redeemed within 90 days of purchase, if applicable)	rr_RedemptionFeeOverRedemption	(1.00%)
Management fees	rr_ManagementFeesOverAssets	0.59%
Distribution and/or service (12b-1) fees	rr_DistributionAndService12b1FeesOverAssets	0.25%
Other expenses	rr_OtherExpensesOverAssets	2.13%	[2]
Acquired fund fees and expenses	rr_AcquiredFundFeesAndExpensesOverAssets	0.33%	[2],[3]
Total annual fund operating expenses	rr_ExpensesOverAssets	3.30%	[3]
Less management fee waiver/expense reimbursements	rr_FeeWaiverOrReimbursementOverAssets	(2.02%)
Total annual fund operating expenses after management fee waiver/expense reimbursements	rr_NetExpensesOverAssets	1.28%	[3],[4]
Fee Waiver or Reimbursement over Assets, Date of Termination	rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination	2013-10-28
Expense Example, with Redemption, 1 Year	rr_ExpenseExampleYear01	575
Expense Example, with Redemption, 3 Years	rr_ExpenseExampleYear03	1,239
UBS Multi-Asset Income Fund (Prospectus Summary) | UBS Multi-Asset Income Fund | Class C
Risk Return [Abstract]	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	0.75%
Redemption fee (as a % of amount redeemed within 90 days of purchase, if applicable)	rr_RedemptionFeeOverRedemption	(1.00%)
Management fees	rr_ManagementFeesOverAssets	0.59%
Distribution and/or service (12b-1) fees	rr_DistributionAndService12b1FeesOverAssets	1.00%
Other expenses	rr_OtherExpensesOverAssets	2.22%	[2]
Acquired fund fees and expenses	rr_AcquiredFundFeesAndExpensesOverAssets	0.33%	[2],[3]
Total annual fund operating expenses	rr_ExpensesOverAssets	4.14%	[3]
Less management fee waiver/expense reimbursements	rr_FeeWaiverOrReimbursementOverAssets	(2.11%)
Total annual fund operating expenses after management fee waiver/expense reimbursements	rr_NetExpensesOverAssets	2.03%	[3],[4]
Fee Waiver or Reimbursement over Assets, Date of Termination	rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination	2013-10-28
Expense Example, with Redemption, 1 Year	rr_ExpenseExampleYear01	281
Expense Example, with Redemption, 3 Years	rr_ExpenseExampleYear03	1,066
Expense Example, No Redemption, 1 Year	rr_ExpenseExampleNoRedemptionYear01	206
Expense Example, No Redemption, 3 Years	rr_ExpenseExampleNoRedemptionYear03	1,066
UBS Multi-Asset Income Fund (Prospectus Summary) | UBS Multi-Asset Income Fund | Class Y
Risk Return [Abstract]	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 fees	rr_ManagementFeesOverAssets	0.59%
Distribution and/or service (12b-1) fees	rr_DistributionAndService12b1FeesOverAssets	none
Other expenses	rr_OtherExpensesOverAssets	2.14%	[2]
Acquired fund fees and expenses	rr_AcquiredFundFeesAndExpensesOverAssets	0.33%	[2],[3]
Total annual fund operating expenses	rr_ExpensesOverAssets	3.06%	[3]
Less management fee waiver/expense reimbursements	rr_FeeWaiverOrReimbursementOverAssets	(2.03%)
Total annual fund operating expenses after management fee waiver/expense reimbursements	rr_NetExpensesOverAssets	1.03%	[3],[4]
Fee Waiver or Reimbursement over Assets, Date of Termination	rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination	2013-10-28
Expense Example, with Redemption, 1 Year	rr_ExpenseExampleYear01	105
Expense Example, with Redemption, 3 Years	rr_ExpenseExampleYear03	754

[1] 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.

[2] "Other expenses" and "Acquired fund fees and expenses" are based on annualized amounts for the Fund's fiscal year ended June 30, 2012.

[3] 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.

[4] 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, and 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, and dividend expense and security loan fees for securities sold short), through the period ending October 28, 2013, do not exceed 0.95% for Class A shares, 1.70% for Class C shares and 0.70% 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. 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, the UBS Global AM (Americas)'s three year recoupment rights will survive.

XML

UBS Equity Long-Short Multi-Strategy Fund (Prospectus Summary) | UBS Equity Long-Short Multi-Strategy Fund

UBS Equity Long-Short Multi-Strategy Fund (formerly, UBS Market Neutral Multi-Strategy Fund)

Investment objective

The Fund seeks to preserve and grow capital with low correlation to the equity
markets.

Fees and expenses

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 37 of the Fund's
prospectus and in "Reduced sales charges, additional purchase, exchange and
redemption information and other services" on page 107 of the Fund's statement
of additional information ("SAI").

Shareholder fees (fees paid directly from your investment)

Shareholder Fees UBS Equity Long-Short Multi-Strategy Fund	Class A		Class C	Class Y
Maximum front-end sales charge (load) imposed on purchases (as a % of offering price)	5.50%		none	none
Maximum contingent deferred sales charge (load) (CDSC) (as a % of purchase or sales price, whichever is less)	none	[1]	1.00%	none
Redemption fee (as a % of amount redeemed within 90 days of purchase, if applicable)	1.00%		1.00%	1.00%

Annual fund operating expenses (expenses that you pay each year as a percentage of the value of your investment)

Annual Fund Operating Expenses UBS Equity Long-Short Multi-Strategy Fund		Class A	Class C	Class Y
Management fees		1.25%	1.25%	1.25%
Distribution and/or service (12b-1) fees		0.25%	1.00%	none
Dividend expense and security loan fees for securities sold short	[1]	1.50%	1.50%	1.50%
Other		1.76%	1.67%	1.50%
Total other expenses		3.26%	3.17%	3.00%
Acquired fund fees and expenses	[1]	0.01%	0.01%	0.01%
Total annual fund operating expenses	[1][2]	4.77%	5.43%	4.26%
Less management fee waiver/expense reimbursements		1.51%	1.42%	1.25%
Total annual fund operating expenses after management fee waiver/expense reimbursements	[1][2][3]	3.26%	4.01%	3.01%

Example

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:

Expense Example UBS Equity Long-Short Multi-Strategy Fund (USD $)	Expense Example, with Redemption, 1 Year	Expense Example, with Redemption, 3 Years	Expense Example, with Redemption, 5 Years	Expense Example, with Redemption, 10 Years
Class A	861	1,780	2,704	5,031
Class C	503	1,495	2,578	5,244
Class Y	304	1,179	2,068	4,347

Expense Example, No Redemption (USD $)	Expense Example, No Redemption, 1 Year	Expense Example, No Redemption, 3 Years	Expense Example, No Redemption, 5 Years	Expense Example, No Redemption, 10 Years
UBS Equity Long-Short Multi-Strategy Fund Class C	403	1,495	2,578	5,244

Portfolio turnover

The Fund pays transaction costs, such as commissions, when it buys and sells
securities (or "turns over" its portfolio). A higher portfolio turnover 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 242%
of the average value of its portfolio.

Principal strategies

Principal investments

Under normal circumstances, the Fund invests at least 80% of its net assets
(plus borrowings for investment purposes, if any) in equity and/or
equity-related instruments. Equity-related instruments include securities or
other instruments that derive their value from equity securities and may include
such instruments as short sales of equity securities, swaps on equity
securities, and futures and options on equity securities. Investments by the
Fund in equity securities may include, but are not limited to, common stock
and preferred stock of issuers in developed countries (including the United
States) and emerging markets. The Fund's equity investments may include large,
intermediate and small capitalization companies. The Fund will maintain both
long positions and short positions in equity securities and securities with
equity-like characteristics. The Fund also may invest in securities convertible
into equity 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
options, futures, forward agreements, swap agreements (specifically, total
return and currency swaps), equity participation notes and equity linked notes.
All of these derivatives may be used for risk management purposes, such as
hedging against a specific security or currency, or to manage or adjust the risk
profile of the Fund. In addition, all of the derivative instruments listed above
may be used for investment (non-hedging) purposes to earn income; to enhance
returns; to replace more traditional direct investments; to obtain exposure to
certain markets; or to establish net short positions for individual markets,
currencies or securities.

Under certain market conditions, the Fund may invest in companies at the time of
their initial public offering ("IPO"). To the extent permitted by the Investment
Company Act of 1940, as amended (the "1940 Act"), the Fund may borrow money
from banks to purchase investments for the Fund.

Management process

The Fund seeks to maximize total returns by allocating its assets among one or
more distinct equity investment strategies (each a "Fund component" and
together, the "Fund components"), which are managed by portfolio management
teams at the Advisor. Each Fund component is unique in terms of the source of
its investment insight, its geographic focus, or both. A Fund component will
purchase securities long that it believes will outperform the market, other Fund
securities or both, and sell securities short that are expected to underperform
the market, other Fund securities or both. The Fund engages in its long/short
strategies in order to generate returns with low correlations to equity markets.

The Advisor selects Fund components and allocates the Fund's assets among the
Fund components based on each Fund component's expected contribution to the risk
adjusted investment return of the Fund. Fund components are chosen by the
Advisor in part because the Fund components demonstrate a low correlation of
returns versus equity markets and among each other. The Advisor intends to allocate
assets among the Fund components with the goal of providing returns for the Fund
that are a function of the Advisor's stock-level investment insights rather than a
function of broad market movements.

In deciding the Fund's allocation to each Fund component, the Advisor utilizes
analytical tools that enable the Advisor to view the entire investment portfolio
of the Fund across all underlying components in order to best assess the
allocation of Fund assets among these components based on alpha potential and
contribution to volatility and to monitor the impact of individual stock
positions, both long and short positions, on the Fund's entire portfolio.

The Fund components utilize fundamental valuation, quantitative research or a
combination of both to construct a portfolio. The investment decisions for
certain Fund components are based on price/value discrepancies as identified by
the Advisor's fundamental valuation process. In selecting securities utilizing
the fundamental valuation process, 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 investment decisions for
other Fund components are based on investment opportunities generated by
quantitative research techniques that systematically exploit market anomalies to
provide consistent excess returns for the Fund.

The Fund's expected net equity market exposure (long market value - short market
value) will typically range from 10% to 50%; however, in response to market
conditions the Fund may adjust its net equity market exposure. The Fund's net
equity market exposure may range from -25% to +75% and at the same time will
comply with all leverage restrictions required by Section 18 of the 1940 Act and
subsequent determinations of the SEC and any other regulatory limitations. The
Fund may hold a substantial portion of its total assets in cash when the Fund
maintains a net short equity market position. By taking both long and short
positions, the Fund seeks to provide some protection in down markets when
compared to a fund that takes only long positions.

Main risks

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.

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

Short sales risk: There are certain unique risks associated with the use of
short sales strategies. When selling a security short, the Advisor will sell a
security it does not own at the then-current market price and then borrow the
security to deliver to the buyer. The Fund is then obligated to buy the security
on a later date so it can return the security to the lender. Short sales
therefore involve the risk that the Fund will incur a loss by subsequently
buying a security at a higher price than the price at which the Fund previously
sold the security short. This would occur if the securities lender required the
Fund to deliver the securities the Fund had borrowed at the commencement of the
short sale and the Fund was unable to either purchase the security at a
favorable price or to borrow the security from another securities lender. If
this occurs at a time when other short sellers of the security also want to
close out their positions, a "short squeeze" can occur. A short squeeze occurs
when demand is greater than supply for the security sold short. Moreover,
because a Fund's loss on a short sale arises from increases in the value of the
security sold short, such loss, like the price of the security sold short, is
theoretically unlimited. By contrast, a Fund's loss on a long position arises
from decreases in the value of the security and therefore is limited by the fact
that a security's value cannot drop below zero. It is possible that the Fund's
securities held long will decline in value at the same time that the value of
the securities sold short increases, thereby increasing the potential for loss.

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. These risks are greater for
investments in emerging market issuers. In addition, investments in emerging
market issuers may decline in value because of unfavorable foreign government
actions, greater risks of political instability or the absence of accurate
information about emerging market issuers.

Multi-strategy risk: The risk that the Fund may allocate assets to a Fund
component that underperforms other strategy types.

Market risk: The risk that 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.
  
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, many types of swaps and
other 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.

Leverage risk associated with borrowing: The Fund may borrow money from banks to
purchase investments for the Fund, which is a form of leverage. If the Fund
borrows money to purchase securities and the Fund's investments decrease in
value, the Fund's losses will be greater than if the Fund did not borrow money
for investment purposes. In addition, if the return on an investment purchased
with borrowed funds is not sufficient to cover the cost of borrowing, then the
net income of the Fund would be less than if borrowing were not used.

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.

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.

Performance

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 the Fund's performance for the year 2011 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. On September 5, 2012 the Fund's
investment strategy changed. The performance information below, prior to that
date, is attributable to the Fund's previous investment strategy. 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.

UBS Equity Long-Short Multi-Strategy Fund Annual Total Returns of Class Y Shares (2011 is Fund's first full year of operations)

Total return January 1 - September 30, 2012: (3.12)%
Best quarter during calendar year shown-4Q 2011: (0.15)%
Worst quarter during calendar year shown-3Q 2011: (0.82)%

Average annual total returns (for the periods ended December 31, 2011)

Average Annual Total Returns UBS Equity Long-Short Multi-Strategy Fund	Label	1 Year	Since Inception	Inception Date
Class A	Class A Return before taxes	(7.91%)	(6.29%)	Jun. 30, 2010
Class C	Class C Return before taxes	(4.27%)	(3.38%)	Jun. 30, 2010
Class Y	Class Y Return before taxes	(2.38%)	(2.44%)	Jun. 30, 2010
After Taxes on Distributions Class Y	Class Y Return after taxes on distributions	(2.38%)	(2.44%)	Jun. 30, 2010
After Taxes on Distributions and Sales Class Y	Class Y Return after taxes on distributions and sale of fund shares	(1.53%)	(2.07%)	Jun. 30, 2010
Citigroup Three-Month US Treasury Bill Index	Citigroup Three-Month US Treasury Bill Index	0.08%	0.10%

[1] 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.

[1] Due to the Fund's strategy change, the Fund has restated the "Dividend expense and security loan fees for securities sold short" and "Acquired fund fees and expenses" based on the anticipated expenses for the new strategy. These "Dividend expense and security loan fees for securities sold short" and "Acquired fund fees and expenses" are based on estimates and may vary based on actual investments. The actual "Dividend expense and security loan fees for securities sold short" for the Fund's fiscal year ended June 30, 2012 were 2.50% for Class A shares, 2.55% for Class C shares and 2.58% for Class Y shares. The actual "Acquired fund fees and expenses" for the Fund's fiscal year ended June 30, 2012 were 0.04% for Class A shares, 0.04% for Class C shares and 0.04% for Class Y shares. The actual "Total annual fund operating expenses" for the Fund's fiscal year ended June 30, 2012 were 5.80% for Class A shares, 6.51% for Class C shares and 5.37% for Class Y shares. The actual "Total annual fund operating expenses after management fee waiver/expense reimbursements" for the Fund's fiscal year ended June 30, 2012 were 4.29% for Class A shares, 5.08% for Class C shares and 4.12% for Class Y shares.

[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, and 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, and dividend expense and security loan fees for securities sold short), through the period ending October 28, 2013, do not exceed 1.75% for Class A shares, 2.50% for Class C shares and 1.50% 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. 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, the UBS Global AM (Americas)'s three year recoupment rights will survive.

XML

UBS International Equity Fund (Prospectus Summary) | UBS International Equity Fund

UBS International Equity Fund

Investment objective

The Fund seeks to maximize total return, consisting of capital appreciation and
current income by investing primarily in the equity securities of non-US
issuers.

Fees and expenses

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 37 of the Fund's
prospectus and in "Reduced sales charges, additional purchase, exchange and
redemption information and other services" on page 107 of the Fund's statement
of additional information ("SAI").

Shareholder fees (fees paid directly from your investment)

Shareholder Fees UBS International Equity Fund	Class A		Class C	Class Y
Maximum front-end sales charge (load) imposed on purchases (as a % of offering price)	5.50%		none	none
Maximum contingent deferred sales charge (load) (CDSC) (as a % of purchase or sales price, whichever is less)	none	[1]	1.00%	none
Redemption fee (as a % of amount redeemed within 90 days of purchase, if applicable)	1.00%		1.00%	1.00%

Annual fund operating expenses (expenses that you pay each year as a percentage of the value of your investment)

Annual Fund Operating Expenses UBS International Equity Fund		Class A	Class C	Class Y
Management fees		0.80%	0.80%	0.80%
Distribution and/or service (12b-1) fees		0.25%	1.00%	none
Other expenses	[1]	1.23%	1.26%	1.26%
Total annual fund operating expenses		2.28%	3.06%	2.06%
Less management fee waiver/expense reimbursements		1.03%	1.06%	1.06%
Total annual fund operating expenses after management fee waiver/expense reimbursements	[2]	1.25%	2.00%	1.00%

Example

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 irrevocable fee waiver and
expense reimbursement for all years. Although your actual costs may be higher or
lower, based on these assumptions, your costs would be:

Expense Example UBS International Equity Fund (USD $)	Expense Example, with Redemption, 1 Year	Expense Example, with Redemption, 3 Years	Expense Example, with Redemption, 5 Years	Expense Example, with Redemption, 10 Years
Class A	670	925	1,199	1,978
Class C	303	627	1,078	2,327
Class Y	102	318	552	1,225

Expense Example, No Redemption (USD $)	Expense Example, No Redemption, 1 Year	Expense Example, No Redemption, 3 Years	Expense Example, No Redemption, 5 Years	Expense Example, No Redemption, 10 Years
UBS International Equity Fund Class C	203	627	1,078	2,327

Portfolio turnover

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 49%
of the average value of its portfolio.

Principal strategies

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.
Investments in equity securities may include, but are not limited to,
dividend-paying securities, common stock and preferred stock of issuers located
throughout the world. The Fund may invest in issuers from both developed and
emerging markets. The Advisor, on behalf of the Fund, intends to diversify
broadly among countries, but reserves the right to invest a substantial portion
of the Fund's assets in one or more countries if economic and business
conditions warrant such investments. The Fund may invest in stocks of companies
of any size.

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, forward currency agreements and equity participation notes. All of
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,
all of the derivative instruments listed above may be used for investment
(non-hedging) purposes to earn income; to enhance returns; to replace more
traditional direct investments (except for forward currency agreements); to
obtain exposure to certain markets; or to establish net short positions for
individual currencies (except for equity participation notes).

Management process

The Advisor's investment decisions with respect to a portion of the Fund's
portfolio are based upon price/value discrepancies as identified by the
Advisor's fundamental valuation process. The Advisor utilizes growth-oriented
strategies with respect to the remainder of the Fund's portfolio.

In selecting securities for the portion of the Fund that is managed according to
the Advisor's fundamental valuation process, 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 country, 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 across industries and countries with attractive relative price/value
characteristics.

With respect to the portion of the Fund's portfolio that is managed according to
the Advisor's growth-oriented strategies, the Advisor seeks to invest in
companies which are undergoing positive sustainable fundamental change driving a
period of above average earnings growth. Hallmarks of such companies include a
dominant market position and franchise, major technological edge or unique
competitive advantage. In selecting securities with this strategy, the Advisor
selects companies it believes can sustain an above average return on invested
capital and over a longer period of time than is reflected in current market
prices.

Main risks

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.
  
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. These risks are greater for
investments in emerging market issuers. In addition, investments in emerging
market issuers may decline in value because of unfavorable foreign government
actions, greater risks of political instability or the absence of accurate
information about emerging market issuers.

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

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.

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.

Performance

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. Life of class performance for the index is as of the
inception month-end of each class. Index reflects no deduction for fees and
expenses. 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.

UBS International Equity Fund Annual Total Returns of Class Y Shares

Total return January 1 - September 30, 2012: 11.50%
Best quarter during calendar years shown-2Q 2009: 29.94%
Worst quarter during calendar years shown-3Q 2011: (23.88)%

Average annual total returns (for the periods ended December 31, 2011)

Average Annual Total Returns UBS International Equity Fund	Label		1 Year	5 Years	10 Years	Since Inception		Inception Date
Class A	Class A Return before taxes		(22.50%)	(6.09%)	2.66%	1.42%		Jun. 30, 1997
Class C	Class C Return before taxes	[1]	(19.45%)	(5.75%)		2.85%		Jan. 25, 2002
Class Y	Class Y Return before taxes		(17.79%)	(4.80%)	3.48%	3.69%		Aug. 31, 1993
After Taxes on Distributions Class Y	Class Y Return after taxes on distributions		(17.98%)	(5.95%)	2.45%	2.36%		Aug. 31, 1993
After Taxes on Distributions and Sales Class Y	Class Y Return after taxes on distributions and sale of fund shares		(11.06%)	(4.13%)	2.83%	2.71%		Aug. 31, 1993
MSCI World Free ex USA Index (net)	MSCI World Free ex USA Index (net)		(12.21%)	(4.09%)	5.14%		[2]

[1] 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.

[1] "Other expenses" include "Acquired fund fees and expenses," which were less than 0.01% of the average net assets of the Fund.

[2] UBS Global Asset Management (Americas) Inc., the Fund's investment advisor ("UBS Global AM (Americas)" or the "Advisor"), has agreed irrevocably to waive its fees and reimburse certain expenses (excluding expenses incurred through investment in other investment companies, interest, taxes, brokerage commissions and extraordinary expenses) so that the Fund's ordinary operating expenses (excluding expenses incurred through investment in other investment companies, interest, taxes, brokerage commissions and extraordinary expenses) do not exceed 1.25% for Class A shares, 2.00% for Class C shares and 1.00% for Class Y shares.

[1] 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.

[2] Average annual total returns for the MSCI World Free ex USA Index (net) for the life of each class were as follows: Class A-3.16%; Class C-5.74%; Class Y-4.41%.

XML

UBS Core Plus Bond Fund (Prospectus Summary) | UBS Core Plus Bond Fund

UBS Core Plus Bond Fund

Investment objective

The Fund seeks to maximize total return, consisting of capital appreciation and
current income.

Fees and expenses

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 $100,000 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 34 of the Fund's
prospectus and in "Reduced sales charges, additional purchase, exchange and
redemption information and other services" on page 107 of the Fund's statement
of additional information ("SAI").

Shareholder fees (fees paid directly from your investment)

Shareholder Fees UBS Core Plus Bond Fund	Class A		Class C	Class Y
Maximum front-end sales charge (load) imposed on purchases (as a % of offering price)	4.50%		none	none
Maximum contingent deferred sales charge (load) (CDSC) (as a % of purchase or sales price, whichever is less)	none	[1]	0.75%	none
Redemption fee (as a % of amount redeemed within 90 days of purchase, if applicable)	1.00%		1.00%	1.00%

Annual fund operating expenses (expenses that you pay each year as a percentage of the value of your investment)

Annual Fund Operating Expenses UBS Core Plus Bond Fund		Class A	Class C	Class Y
Management fees		0.50%	0.50%	0.50%
Distribution and/or service (12b-1) fees		0.25%	0.75%	none
Other expenses		0.70%	0.66%	0.62%
Acquired fund fees and expenses		0.01%	0.01%	0.01%
Total annual fund operating expenses	[1]	1.46%	1.92%	1.13%
Less management fee waiver/expense reimbursements		0.81%	0.77%	0.73%
Total annual fund operating expenses after management fee waiver/expense reimbursements	[1][2]	0.65%	1.15%	0.40%

Example

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:

Expense Example UBS Core Plus Bond Fund (USD $)	Expense Example, with Redemption, 1 Year	Expense Example, with Redemption, 3 Years	Expense Example, with Redemption, 5 Years	Expense Example, with Redemption, 10 Years
Class A	513	815	1,138	2,051
Class C	192	528	965	2,181
Class Y	41	287	552	1,309

Expense Example, No Redemption (USD $)	Expense Example, No Redemption, 1 Year	Expense Example, No Redemption, 3 Years	Expense Example, No Redemption, 5 Years	Expense Example, No Redemption, 10 Years
UBS Core Plus Bond Fund Class C	117	528	965	2,181

Portfolio turnover

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 509%
of the average value of its portfolio.

Principal strategies

Principal investments

Under normal circumstances, the Fund invests at least 80% of its net assets
(plus borrowings for investment purposes, if any) in bonds, which are defined as
fixed income securities. The Fund may invest in fixed income securities of any
maturity, but generally invests in securities having an initial maturity of
greater than one year.

The Fund's investments in fixed income securities may include, but are not
limited to, securities of the US government, its agencies and
government-sponsored enterprises, securities guaranteed by the US government,
corporate debt securities of US and non-US issuers, including convertible
securities, obligations of non-US governments or their subdivisions, agencies
and government-sponsored enterprises, obligations of international agencies or
supranational entities, mortgage-backed and asset-backed securities.

The Fund may invest up 35% of its net assets in foreign fixed income securities,
with up to 30% of its net assets in fixed income securities denominated in
foreign currencies. Under normal conditions, the Fund expects to limit foreign
currency exposure to 20% of the Fund's net assets.

The Fund generally invests in investment grade securities. However, the Fund may
invest up to 30% of its net assets in any combination of high yield (lower-rated
or "junk bonds") securities, emerging market fixed income securities or other
non-investment grade securities, provided that no more than 15% of its net
assets may be invested in developed market high yield securities and no more
than 15% of its net assets may be invested in emerging market securities.
Depending on its assessment of market conditions, the Advisor may choose to
allocate the Fund's assets in any combination among these types of investments
or may choose not to invest in these types of investments.

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
options (including, but not limited to, options on futures, forwards and swap
agreements), futures, forward agreements, swap agreements (specifically,
interest rate, total return, currency, credit default and inflation swaps),
credit-linked securities and structured investments. All of these derivatives
may be used for risk management purposes, such as hedging against a specific
security or currency, or to manage or adjust the risk profile of the Fund. In
addition, all of the derivative instruments listed above may be used for
investment (non-hedging) purposes to earn income; to enhance returns; to replace
more traditional direct investments; to obtain exposure to certain markets; to
establish net short positions for individual sectors, markets, currencies or
securities; or to adjust the Fund's portfolio duration.

Management process

The Advisor uses an investment style focused on investment fundamentals. The
Advisor believes that investment fundamentals determine and define investment
value. The Advisor seeks to identify and exploit periodic differences between
market prices and fundamental value. In analyzing price/value differences, the
Advisor also takes into account cyclical market drivers that may influence near
term dynamics of market prices.

The Advisor considers various factors and incorporates numerous tools to
construct and manage investment portfolios. Through a combination of top-down
macroeconomic analysis and forecasting and intensive bottom-up issuer-specific
research, the Advisor makes active decisions related to duration, yield curve
positioning, relative sector, issuer, and quality exposures. Both quantitative
and qualitative analysis is employed to all facets of portfolio construction and
management with a comprehensive focus on risk management in both absolute and
benchmark-relative terms.

Main risks

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.

Interest rate risk: An increase in prevailing interest rates typically causes
the value of fixed income securities to fall. Changes in interest rates will
likely affect the value of longer-duration fixed income securities more than
shorter-duration securities and higher quality securities more than lower
quality securities. When interest rates are falling, some fixed income
securities provide that the issuer may repay them earlier than the maturity
date, and if this occurs the Fund may have to reinvest these repayments at lower
interest rates.

Credit risk: The risk that the Fund could lose money if the issuer or guarantor
of a fixed income security, or the counterparty to or guarantor of a derivative
contract, is unable or unwilling to meet its financial obligations. This risk is
likely greater for lower quality investments than for investments that are
higher quality.

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.

High yield bond risk: The risk that the issuer of bonds with ratings of BB
(Standard & Poor's Ratings Group ("S&P")) or Ba (Moody's Investors Service, Inc.
("Moody's")) or below, or deemed of equivalent quality, will default or
otherwise be unable to honor a financial obligation (also known as lower-rated
or "junk bonds"). These securities are considered to be predominately
speculative with respect to an issuer's capacity to pay interest and repay
principal in accordance with the terms of the obligations. Lower-quality bonds
are more likely to be subject to an issuer's default or downgrade than
investment grade (higher-quality) bonds.

Market risk: The risk that 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.

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. Investments in foreign government bonds involve special risks because
the Fund may have limited legal recourse in the event of default. Also, foreign
securities are sometimes less liquid and more difficult to sell and to value
than securities of US issuers. These risks are greater for investments in
emerging market issuers. In addition, investments in emerging market issuers may
decline in value because of unfavorable foreign government actions, greater
risks of political instability or the absence of accurate information about
emerging market issuers.

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. Derivatives relating to fixed income
markets are especially susceptible to interest rate risk and credit risk. In
addition, many types of swaps and other 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.

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

Performance

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.

UBS Core Plus Bond Fund Annual Total Returns of Class Y Shares

Total return January 1 - September 30, 2012: 5.23%
Best quarter during calendar years shown-3Q 2009: 5.28%
Worst quarter during calendar years shown-1Q 2008: (6.16)%

Average annual total returns (for the periods ended December 31, 2011)

Average Annual Total Returns UBS Core Plus Bond Fund	Label		1 Year	5 Years	10 Years	Inception Date
Class A	Class A Return before taxes		2.46%	1.28%	2.86%	Jun. 30, 1997
Class C	Class C Return before taxes	[1]	6.08%	1.67%	2.80%	Nov. 08, 2001
Class Y	Class Y Return before taxes		7.74%	2.45%	3.59%	Aug. 31, 1995
After Taxes on Distributions Class Y	Class Y Return after taxes on distributions		6.61%	0.50%	1.77%	Aug. 31, 1995
After Taxes on Distributions and Sales Class Y	Class Y Return after taxes on distributions and sale of fund shares		5.01%	0.91%	1.98%	Aug. 31, 1995
Barclays US Aggregate Index	Barclays US Aggregate Index		7.84%	6.50%	5.78%

[1] 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.

[1] 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.

[2] 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 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 28, 2013, do not exceed 0.64% for Class A shares, 1.14% for Class C shares and 0.39% 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. 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, the UBS Global AM (Americas)'s three year recoupment rights will survive.

[1] 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.

XML

UBS Dynamic Alpha Fund (Prospectus Summary) | UBS Dynamic Alpha Fund

UBS Dynamic Alpha Fund

Investment objective

The Fund seeks to maximize total return, consisting of capital appreciation and
current income.

Fees and expenses

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 43 of the Fund's
prospectus and in "Reduced sales charges, additional purchase, exchange and
redemption information and other services" on page 107 of the Fund's statement
of additional information ("SAI").

Shareholder fees (fees paid directly from your investment)

Shareholder Fees UBS Dynamic Alpha Fund	Class A		Class C	Class Y
Maximum front-end sales charge (load) imposed on purchases (as a % of offering price)	5.50%		none	none
Maximum contingent deferred sales charge (load) (CDSC) (as a % of purchase or sales price, whichever is less)	none	[1]	1.00%	none
Redemption fee (as a % of amount redeemed within 90 days of purchase, if applicable)	1.00%		1.00%	1.00%

Annual fund operating expenses (expenses that you pay each year as a percentage of the value of your investment)

Annual Fund Operating Expenses UBS Dynamic Alpha Fund		Class A	Class C	Class Y
Management fees		0.85%	0.85%	0.85%
Distribution and/or service (12b-1) fees		0.25%	1.00%	none
Other expenses	[1]	0.31%	0.32%	0.25%
Acquired fund fees and expenses		0.01%	0.01%	0.01%
Total annual fund operating expenses	[1][2]	1.42%	2.18%	1.11%
Less management fee waiver/expense reimbursements		0.06%	0.07%	none
Total annual fund operating expenses after management fee waiver/expense reimbursements	[1][2][3]	1.36%	2.11%	1.11%

Example

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:

Expense Example UBS Dynamic Alpha Fund (USD $)	Expense Example, with Redemption, 1 Year	Expense Example, with Redemption, 3 Years	Expense Example, with Redemption, 5 Years	Expense Example, with Redemption, 10 Years
Class A	681	969	1,278	2,153
Class C	314	675	1,163	2,508
Class Y	113	353	612	1,352

Expense Example, No Redemption (USD $)	Expense Example, No Redemption, 1 Year	Expense Example, No Redemption, 3 Years	Expense Example, No Redemption, 5 Years	Expense Example, No Redemption, 10 Years
UBS Dynamic Alpha Fund Class C	214	675	1,163	2,508

Portfolio turnover

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 164%
of the average value of its portfolio.

Principal strategies

Principal investments

The Fund invests in securities and financial instruments to gain exposure to
global equity, global fixed income and cash equivalent markets, including global
currencies. The Fund may invest in equity and fixed income securities of issuers
located within and outside the United States or in open-end investment companies
advised by the Advisor, to gain exposure to certain global equity and global
fixed income markets. The Fund is a non-diversified fund.

Investments in fixed income securities may include, but are not limited to, debt
securities of governments throughout the world (including the United States),
their agencies and instrumentalities, debt securities of corporations and
supranationals, inflation protected securities, convertible bonds, mortgage-backed
securities, asset-backed securities, equipment trusts and other collateralized debt
securities. Investments in fixed income securities may include issuers in both
developed (including the United States) and emerging markets. The Fund's fixed
income investments may reflect a broad range of investment maturities, credit
qualities and sectors, including high yield (lower-rated or "junk bonds") securities
and convertible debt securities.

Investments in equity securities may include, but are not limited to, common
stock and preferred stock of issuers in developed nations (including the United
States) and emerging markets. Equity investments may include securities of
companies of any capitalization size.

In addition, the Fund attempts to generate positive returns and manage risk
through asset allocation and sophisticated currency management techniques. These
decisions are integrated with analysis of global market and economic conditions.

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
options (on securities, indices, or swap agreements), futures, forward
agreements, swap agreements (specifically, interest rate, total return, currency
and credit default swaps), credit-linked securities, equity participation notes
and equity linked notes. All of these derivatives may be used for risk
management purposes, such as hedging against a specific security or currency, or
to manage or adjust the risk profile of the Fund. In addition, all of the
derivative instruments listed above may be used for investment (non-hedging)
purposes to earn income; to enhance returns; to replace more traditional direct
investments; to obtain exposure to certain markets; or to establish net short
positions for individual markets, currencies or securities. Options on indices,
futures on indices, forward agreements, interest rate swaps, total return swaps,
credit default swaps and credit-linked securities may also be used to adjust the
Fund's portfolio duration. Any of the derivatives listed above may be used to
achieve a negative portfolio duration.

Under certain market conditions, the Fund may invest in companies at the time of
their initial public offering ("IPO"). To the extent permitted by the Investment
Company Act of 1940, as amended (the "1940 Act"), the Fund may borrow money from
banks to purchase investments for the Fund.

Management process

The Fund is a multi-asset fund. Asset allocation decisions are tactical, based
upon the Advisor's assessment of valuations and prevailing market conditions in
the United States and abroad. In determining the asset allocation of the Fund, the
Advisor may utilize fundamental valuation and market behavior indicators to
construct the Fund's portfolio.

With respect to the Advisor's selection of specific equity securities for
inclusion in the Fund's equity asset classes, the Advisor may utilize
fundamental valuation, growth-oriented and quantitative research strategies.

In selecting equity securities for the Fund using the fundamental valuation
process, the Advisor selects securities whose fundamental values (the Advisor's
assessment of what a security is worth) it believes are greater than what is
reflected in market prices. A stock with a market price below its assessed
fundamental value would be considered a long candidate for inclusion in the
Fund's portfolio. A stock with a market price above its assessed fundamental
value would be considered a short candidate for inclusion in the Fund's
portfolio.

Under certain circumstances the Advisor also may utilize growth-oriented
strategies within its equity asset classes for a portion of the allocation. In
selecting growth equities, the Advisor seeks to invest in companies that possess
a dominant market position and franchise, a major technological edge or a unique
competitive advantage.

To make investment decisions for certain equity asset classes, the Advisor
utilizes quantitative research techniques that identify investment opportunities
by systematically exploring many small reappearing market anomalies to attempt
to provide consistent excess returns for the Fund.

The Advisor's fixed income strategy combines judgments about the absolute value
of the fixed income universe and the relative value of issuer sectors, maturity
intervals, security durations, credit qualities and coupon segments, as well as
specific circumstances facing the issuers of fixed income securities.

In employing its investment strategies for the Fund, the Advisor attempts to
achieve a total rate of return for the Fund that meets or exceeds 5% per year on
a real (i.e., inflation-adjusted) basis and net of management fees over rolling
five year time horizons. The Advisor does not represent or guarantee that the
Fund will meet this total return goal.

Main risks

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.

Interest rate risk: An increase in prevailing interest rates typically causes
the value of fixed income securities to fall. Changes in interest rates will
likely affect the value of longer-duration fixed income securities more than
shorter-duration securities and higher quality securities more than lower
quality securities. When interest rates are falling, some fixed income
securities provide that the issuer may repay them earlier than the maturity
date, and if this occurs the Fund may have to reinvest these repayments at lower
interest rates.

Credit risk: The risk that the Fund could lose money if the issuer or guarantor
of a fixed income security, or the counterparty to or guarantor of a derivative
contract, is unable or unwilling to meet its financial obligations. This risk is
likely greater for lower quality investments than for investments that are
higher quality.

High yield bond risk: The risk that the issuer of bonds with ratings of BB
(Standard & Poor's Ratings Group ("S&P")) or Ba (Moody's Investors Service, Inc.
("Moody's")) or below, or deemed of equivalent quality, will default or
otherwise be unable to honor a financial obligation (also known as lower-rated
or "junk bonds"). These securities are considered to be predominately
speculative with respect to an issuer's capacity to pay interest and repay
principal in accordance with the terms of the obligations. Lower-quality bonds
are more likely to be subject to an issuer's default or downgrade than
investment grade (higher-quality) bonds.

Government securities risk: There are different types of US government
securities with different levels of credit risk, including 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.

Market risk: The risk that 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.

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.

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. Investments in foreign government bonds involve special risks because
the Fund may have limited legal recourse in the event of default. Also, foreign
securities are sometimes less liquid and more difficult to sell and to value
than securities of US issuers. These risks are greater for investments in
emerging market issuers. In addition, investments in emerging market issuers may
decline in value because of unfavorable foreign government actions, greater
risks of political instability or the absence of accurate information about
emerging market issuers.

Asset allocation risk: The risk that the Fund may allocate assets to an asset
category that performs poorly relative to other asset categories.

Non-diversification risk: The Fund is a non-diversified investment company,
which means that the Fund may invest more of its assets in a smaller number of
issuers than a diversified investment company. As a non-diversified fund, the
Fund's share price may be more volatile and the Fund has a greater potential to
realize losses upon the occurrence of adverse events affecting a particular
issuer.

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. Derivatives relating to fixed income
markets are especially susceptible to interest rate risk and credit risk. In
addition, many types of swaps and other 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.

Leverage risk associated with borrowing: The Fund may borrow money from banks to
purchase investments for the Fund, which is a form of leverage. If the Fund
borrows money to purchase securities and the Fund's investments decrease in
value, the Fund's losses will be greater than if the Fund did not borrow money
for investment purposes. In addition, if the return on an investment purchased
with borrowed funds is not sufficient to cover the cost of borrowing, then the
net income of the Fund would be less than if borrowing were not used.

Investing in other funds risks: The Fund's investment performance is affected by
the investment performance of the underlying funds in which the Fund may invest.
Through its investment in the underlying funds, the Fund is subject to the risks
of the underlying funds' investments and subject to the underlying funds'
expenses.

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

Performance

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. The MSCI World Free Index (net) shows how the Fund's
performance compares to an index that is designed to measure the equity market
performance of developed markets. The US Consumer Price Index (CPI) shows how
the Fund's performance compares to monthly data on changes in the prices paid by
urban consumers. Life of class performance for the BofA Merrill Lynch US
Treasury 1-5 Year Index, the MSCI World Free Index (net) and the US Consumer
Price Index (CPI) is as of the inception month end. Indices reflect no deduction
for fees, expenses or taxes, except for the MSCI World Free Index (net) which
reflects no deduction for fees and expenses. 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.

UBS Dynamic Alpha Fund Annual Total Returns of Class Y Shares (2006 is the fund's first full year of operations)

Total return January 1 - September 30, 2012: 10.73%
Best quarter during calendar years shown-2Q 2009: 18.12%
Worst quarter during calendar years shown-4Q 2008: (17.08)%

Average annual total returns (for the periods ended December 31, 2011)

Average Annual Total Returns UBS Dynamic Alpha Fund	Label	1 Year	5 Years	Since Inception	Inception Date
Class A	Class A Return before taxes	(7.08%)	(1.98%)	0.82%	Jan. 27, 2005
Class C	Class C Return before taxes	(3.36%)	(1.63%)	0.87%	Jan. 27, 2005
Class Y	Class Y Return before taxes	(1.28%)	(0.56%)	1.95%	Jan. 27, 2005
Class Y After Taxes on Distributions	Class Y Return after taxes on distributions	(1.28%)	(2.34%)	0.60%	Jan. 27, 2005
Class Y After Taxes on Distributions and Sales	Class Y Return after taxes on distributions and sale of fund shares	(0.83%)	(0.89%)	1.35%	Jan. 27, 2005
MSCI World Free Index (net)	MSCI World Free Index (net)	(5.54%)	(2.37%)	2.58%
BofA Merrill Lynch US Treasury 1-5 Year Index	BofA Merrill Lynch US Treasury 1-5 Year Index	3.36%	4.77%	4.20%
US Consumer Price Index (CPI)	US Consumer Price Index (CPI)	2.96%	2.26%	2.46%

[1] 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.

[1] "Other expenses" have been restated to eliminate the effect of short sales on expenses since the Fund does not intend to sell securities short. The actual "Other expenses" for the Fund's fiscal year ended June 30, 2012 were 0.50% for Class A shares, 0.51% for Class C shares and 0.43% for Class Y shares. The actual "Total annual fund operating expenses" for the Fund's fiscal year ended June 30, 2012 were 1.61% for Class A shares, 2.37% for Class C shares and 1.29% for Class Y shares. The actual "Total annual fund operating expenses after management fee waiver/expense reimbursements" for the Fund's fiscal year ended June 30, 2012 were 1.55% for Class A shares, 2.30% for Class C shares and 1.29% for Class Y shares.

[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, and 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, and dividend expense and security loan fees for securities sold short), through the period ending October 28, 2013, do not exceed 1.35% for Class A shares, 2.10% for Class C shares and 1.10% 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. 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, the UBS Global AM (Americas)'s three year recoupment rights will survive.

XML

UBS Global Bond Fund (Prospectus Summary) | UBS Global Bond Fund

UBS Global Bond Fund

Investment objective

The Fund seeks to maximize total return, consisting of capital appreciation and
current income.

Fees and expenses

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 $100,000 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 34 of the Fund's
prospectus and in "Reduced sales charges, additional purchase, exchange and
redemption information and other services" on page 107 of the Fund's statement
of additional information ("SAI").

Shareholder fees (fees paid directly from your investment)

Shareholder Fees UBS Global Bond Fund	Class A		Class C	Class Y
Maximum front-end sales charge (load) imposed on purchases (as a % of offering price)	4.50%		none	none
Maximum contingent deferred sales charge (load) (CDSC) (as a % of purchase or sales price, whichever is less)	none	[1]	0.75%	none
Redemption fee (as a % of amount redeemed within 90 days of purchase, if applicable)	1.00%		1.00%	1.00%

Annual fund operating expenses (expenses that you pay each year as a percentage of the value of your investment)

Annual Fund Operating Expenses UBS Global Bond Fund		Class A	Class C	Class Y
Management fees		0.65%	0.65%	0.65%
Distribution and/or service (12b-1) fees		0.25%	0.75%	none
Other expenses	[1]	1.73%	1.70%	1.73%
Total annual fund operating expenses		2.63%	3.10%	2.38%
Less management fee waiver/expense reimbursements		1.48%	1.45%	1.48%
Total annual fund operating expenses after management fee waiver/expense reimbursements	[2]	1.15%	1.65%	0.90%

Example

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:

Expense Example UBS Global Bond Fund (USD $)	Expense Example, with Redemption, 1 Year	Expense Example, with Redemption, 3 Years	Expense Example, with Redemption, 5 Years	Expense Example, with Redemption, 10 Years
Class A	562	1,096	1,656	3,175
Class C	243	821	1,499	3,310
Class Y	92	600	1,136	2,603

Expense Example, No Redemption (USD $)	Expense Example, No Redemption, 1 Year	Expense Example, No Redemption, 3 Years	Expense Example, No Redemption, 5 Years	Expense Example, No Redemption, 10 Years
UBS Global Bond Fund Class C	168	821	1,499	3,310

Portfolio turnover

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 59%
of the average value of its portfolio.

Principal strategies

Principal investments

The Fund generally invests at least 65% of its net assets in investment grade
global debt securities that may also provide the potential for capital
appreciation. Under normal circumstances, the Fund invests at least 80% of its
net assets (plus borrowings for investment purposes, if any) in bonds. The Fund
is a non-diversified fund.

The Fund may invest in all types of fixed income securities of US, foreign and
emerging markets issuers. Investments in bonds may include, but are not limited
to, debt securities of governments throughout the world (including the United
States and emerging markets), their agencies and instrumentalities, debt
securities of corporations, mortgage-backed securities and asset-backed
securities. The Fund may invest in bonds of any maturity, but generally invests
in bonds having an initial maturity of more than one year. In addition, the Fund
may invest in high yield (lower-rated or "junk bonds") 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
options (including, but not limited to, options on futures, forwards and swap
agreements), futures, forward agreements, swap agreements (specifically, interest
rate, total return, currency, credit default and inflation swaps), credit-linked
securities and structured investments. All of these derivatives may be used for
risk management purposes, such as hedging against a specific security or currency,
or to manage or adjust the risk profile of the Fund. In addition, all of the
derivative instruments listed above may be used for investment (non-hedging)
purposes to earn income; to enhance returns; to replace more traditional direct
investments; to obtain exposure to certain markets; to establish net short positions
for individual sectors, markets, currencies or securities; or to adjust the Fund's
portfolio duration.

Management process

With respect to the selection of securities to purchase for the Fund, the
Advisor's investment style is focused on investment fundamentals. The Advisor
believes that investment fundamentals determine and describe future cash flows
that define long term investment value. The Advisor tries to identify and
exploit periodic discrepancies between market prices and fundamental value. In
analyzing these price/value differences the Advisor also takes into account
cyclical market drivers which may influence near term dynamics of market prices.

In implementing this style, the Advisor purchases securities for the Fund by
using active asset allocation strategies across global fixed income markets and
active security selection within each market. In deciding which securities to
emphasize, the Advisor uses both quantitative and fundamental analysis to
identify securities that are under-priced relative to their fundamental value.
The valuation of asset classes reflects an integrated, fundamental analysis of
global markets.

The Advisor emphasizes those fixed income market sectors, and selects for the
Fund those securities that appear to be most undervalued relative to their
yields and potential risks. The Advisor selects individual securities for
investment by using duration, yield curve and sector analysis.

Main risks

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.

Interest rate risk: An increase in prevailing interest rates typically causes
the value of fixed income securities to fall. Changes in interest rates will
likely affect the value of longer-duration fixed income securities more than
shorter-duration securities and higher quality securities more than lower
quality securities. When interest rates are falling, some fixed income
securities provide that the issuer may repay them earlier than the maturity
date, and if this occurs the Fund may have to reinvest these repayments at lower
interest rates.

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.

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. Investments in foreign government bonds involve special risks because
the Fund may have limited legal recourse in the event of default. Also, foreign
securities are sometimes less liquid and more difficult to sell and to value
than securities of US issuers. These risks are greater for investments in
emerging market issuers. In addition, investments in emerging market issuers may
decline in value because of unfavorable foreign government actions, greater
risks of political instability or the absence of accurate information about
emerging market issuers.

Credit risk: The risk that the Fund could lose money if the issuer or guarantor
of a fixed income security, or the counterparty to or guarantor of a derivative
contract, is unable or unwilling to meet its financial obligations. This risk is
likely greater for lower quality investments than for investments that are
higher quality.

High yield bond risk: The risk that the issuer of bonds with ratings of BB
(Standard & Poor's Ratings Group ("S&P")) or Ba (Moody's Investors Service, Inc.
("Moody's")) or below, or deemed of equivalent quality, will default or
otherwise be unable to honor a financial obligation (also known as lower-rated
or "junk bonds"). These securities are considered to be predominately
speculative with respect to an issuer's capacity to pay interest and repay
principal in accordance with the terms of the obligations. Lower-quality bonds
are more likely to be subject to an issuer's default or downgrade than
investment grade (higher-quality) bonds.

Market risk: The risk that 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.

Non-diversification risk: The Fund is a non-diversified investment company,
which means that the Fund may invest more of its assets in a smaller number of
issuers than a diversified investment company. As a non-diversified fund, the
Fund's share price may be more volatile and the Fund has a greater potential to
realize losses upon the occurrence of adverse events affecting a particular
issuer.

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. Derivatives relating to fixed income
markets are especially susceptible to interest rate risk and credit risk. In
addition, many types of swaps and other 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.

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

Performance

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.

UBS Global Bond Fund Annual Total Returns of Class Y Shares

Total return January 1 - September 30, 2012: 5.44%
Best quarter during calendar years shown-2Q 2002: 12.70%
Worst quarter during calendar years shown-1Q 2009: (6.93)%

Average annual total returns (for the periods ended December 31, 2011)

Average Annual Total Returns UBS Global Bond Fund	Label		1 Year	5 Years	10 Years	Since Inception		Inception Date
Class A	Class A Return before taxes		0.16%	1.03%	4.50%	4.05%		Nov. 05, 2001
Class C	Class C Return before taxes	[1]	3.69%	1.43%		3.56%		Jul. 02, 2002
Class Y	Class Y Return before taxes		5.21%	2.21%	5.25%	4.74%		Jul. 31, 1993
After Taxes on Distributions Class Y	Class Y Return after taxes on distributions		2.85%	(0.44%)	3.13%	2.63%		Jul. 31, 1993
After Taxes on Distributions and Sales Class Y	Class Y Return after taxes on distributions and sale of fund shares		3.38%	0.32%	3.29%	2.78%		Jul. 31, 1993
Barclays Global Aggregate Index	Barclays Global Aggregate Index		5.64%	6.46%	7.16%		[2]

[1] 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.

[1] "Other expenses" include "Acquired fund fees and expenses," which were less than 0.01% of the average net assets of the Fund.

[2] 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 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 28, 2013, do not exceed 1.15% for Class A shares, 1.65% for Class C shares and 0.90% 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. 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, the UBS Global AM (Americas)'s three year recoupment rights will survive.

[1] 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.

[2] Average annual total returns for the Barclays Global Aggregate Index for the life of each class were as follows: Class A-6.68%; Class C-6.66%; Class Y-6.24%.

XML

UBS U.S. Small Cap Equity Fund (Prospectus Summary) | UBS U.S. Small Cap Equity Fund

UBS U.S. Small Cap Equity Fund

Investment objective

The Fund seeks to maximize total return, consisting of capital appreciation and
current income.

Fees and expenses

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 20 of the Fund's
prospectus and in "Reduced sales charges, additional purchase, exchange and
redemption information and other services" on page 63 of the Fund's statement of
additional information ("SAI").

Shareholder fees (fees paid directly from your investment)

Shareholder Fees UBS U.S. Small Cap Equity Fund	Class A		Class C	Class Y
Maximum front-end sales charge (load) imposed on purchases (as a % of offering price)	5.50%		none	none
Maximum contingent deferred sales charge (load) (CDSC) (as a % of purchase or sales price, whichever is less)	none	[1]	1.00%	none
Redemption fee (as a percentage of amount redeemed within 90 days of purchase, if applicable)	1.00%		1.00%	1.00%

Annual fund operating expenses (expenses that you pay each year as a percentage of the value of your investment)

Annual Fund Operating Expenses UBS U.S. Small Cap Equity Fund		Class A	Class C	Class Y
Management fees		1.00%	1.00%	1.00%
Distribution and/or service (12b-1) fees		0.25%	1.00%	none
Other expenses	[1]	0.60%	0.60%	0.60%
Total annual fund operating expenses		1.85%	2.60%	1.60%
Less management fee waiver/expense reimbursements		0.45%	0.45%	0.45%
Total annual fund operating expenses after management fee waiver/expense reimbursements	[2]	1.40%	2.15%	1.15%

Example

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:

Expense Example UBS U.S. Small Cap Equity Fund (USD $)	Expense Example, with Redemption, 1 Year	Expense Example, with Redemption, 3 Years
Class A	685	1,058
Class C	318	766
Class Y	117	461

Expense Example, No Redemption (USD $)	Expense Example, No Redemption, 1 Year	Expense Example, No Redemption, 3 Years
UBS U.S. Small Cap Equity Fund Class C	218	766

Portfolio turnover

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.

Principal strategies

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 $3 billion or less. Investments in
equity securities may include, but are not limited to, dividend-paying
securities, common stock and preferred stock. The Fund is a non-diversified
fund.

The Fund may, but is not required to, use 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 on indices, which may
be used for risk management purposes to manage or adjust the risk profile of the
Fund. 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

The Advisor looks for companies with strong and innovative management, good
financial controls, increasing market share, diversified product/service
offerings and low market-to-sales ratios relative to similar companies. 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 Fund 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 Fund will invest in companies within its capitalization range as described
above. However, the Fund may invest a portion of its assets in securities
outside of this range. Further, if movement in the market price causes a
security to change from one capitalization range to another, the Fund is not
required to dispose of the security.

Main risks

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.

Non-diversification risk: The Fund is a non-diversified investment company,
which means that the Fund may invest more of its assets in a smaller number of
issuers than a diversified investment company. As a non-diversified fund, the
Fund's share price may be more volatile and the Fund has a greater potential to
realize losses upon the occurrence of adverse events affecting a particular
issuer.

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. 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.

Performance

There is no performance information quoted for the Fund as the Fund had not
commenced investment operations as of the date of this prospectus.

[1] 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.

[1] "Other expenses" are based on estimates for the current fiscal year.

[2] 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 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 28, 2013, do not exceed 1.40% for Class A 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. 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, the UBS Global AM (Americas)'s three year recoupment rights will survive.

XML

Label	Element	Value
Risk Return [Abstract]	rr_RiskReturnAbstract
ProspectusDate	rr_ProspectusDate	Oct. 29, 2012
UBS Emerging Markets Equity Fund (Prospectus Summary) | UBS Emerging Markets Equity Fund
Risk Return [Abstract]	rr_RiskReturnAbstract
Risk/Return [Heading]	rr_RiskReturnHeading	UBS Emerging Markets Equity Fund
Objective [Heading]	rr_ObjectiveHeading	Investment objective
Objective, Primary [Text Block]	rr_ObjectivePrimaryTextBlock	The Fund seeks to maximize capital appreciation.
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 20 of the Fund's prospectus and in "Reduced sales charges, additional purchase, exchange and redemption information and other services" on page 63 of the Fund's statement of additional information ("SAI").
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)
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.
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
Other Expenses, New Fund, Based on Estimates [Text]	rr_OtherExpensesNewFundBasedOnEstimates	"Other expenses" are based on estimates 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 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 Under normal circumstances, the Fund invests at least 80% of its net assets (plus borrowings for investment purposes, if any) in equity securities that are tied economically to emerging market countries. Investments in equity securities may include, but are not limited to, dividend-paying securities, common stock and preferred stock. Securities tied economically to emerging market countries include securities on which the return is derived from issuers in emerging market countries, such as equity swap contracts and equity swap index contracts. The Fund may invest in stocks of companies of any size. The Fund is a non-diversified fund. 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, forward currency agreements and equity participation notes. All of 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, all of the derivative instruments listed above may be used for investment (non-hedging) purposes to earn income; to enhance returns; to replace more traditional direct investments (except for forward currency agreements); to obtain exposure to certain markets; or to establish net short positions for individual currencies (except for equity participation notes). The Fund intends to invest primarily in a portfolio of equity securities of issuers located in at least three emerging market countries, which may be located in Asia, Europe, Latin America, Africa or the Middle East. An emerging market country is a country defined as an emerging or developing economy by any of the World Bank, the International Finance Corporation or the United Nations or its authorities. Additionally, the Fund, for purposes of its investments, may consider a country included in JP Morgan or MSCI emerging markets indices to be an emerging market country. The countries included in this definition will change over time. Up to 20% of the Fund's net assets may be invested in higher-yielding, lower-rated fixed income securities ("junk bonds"). The Fund may invest in fixed income securities of any maturity, but generally invests in securities having an initial maturity of more than one year. These securities are rated in the lower rating categories of Moody's and S&P, including securities rated Ba or lower by Moody's Investors Service, Inc. ("Moody's") and BB or lower by Standard & Poor's Ratings Group ("S&P"). The Fund may also invest in Eurodollar securities, which are fixed income securities of a US issuer or a foreign issuer that are issued outside of the United States. The Fund may also invest in securities of small capitalization companies. Management process The Advisor is a price to intrinsic value investor. Internally generated research, focused on longer term value drivers at the industry, stock and country level, is used to estimate fundamental value for stocks, upon which investment decisions are made. The process does not have an inherent style bias (e.g., "growth," "value," "large cap" or "small cap"). The Advisor's investment style is singularly focused on investment fundamentals. The Advisor tries to identify and exploit periodic discrepancies between market prices and fundamental value. For each security under analysis, an intrinsic value is estimated based upon detailed country, industry and company analysis, including visits to the company, its competitors and suppliers and other independent sources of information. This intrinsic value estimate is a function of the present value of the estimated future cash flows. The resulting intrinsic value estimate is then compared to the company's current market price to ascertain whether a valuation anomaly exists. A stock with a price below the estimated intrinsic value would be considered a candidate for inclusion in the Fund's portfolio. This comparison between price and intrinsic value allows comparison across industries and countries. The Advisor's investment specialists are organized along sector lines. Through an intensive process of company visits and interactions with industry specialists, analysts gain an understanding of both the company and the dynamics of the company's industry. The goal is to gain a clear understanding of the medium-term (up to five years) and long-term prospects of the company, and in particular, its ability to generate earnings.
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. 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. Investments in foreign government bonds involve special risks because the Fund may have limited legal recourse in the event of default. Also, foreign securities are sometimes less liquid and more difficult to sell and to value than securities of US issuers. These risks are greater for investments in emerging market issuers. In addition, investments in emerging market issuers may decline in value because of unfavorable foreign government actions, greater risks of political instability or the absence of accurate information about emerging market issuers. Geographic concentration risk: The risk that if the Fund has most of its investments in a single country or region, its portfolio will be more susceptible to factors adversely affecting issuers located in that country or region than would a more geographically diverse portfolio of securities. Management risk: The risk that the investment strategies, techniques and risk analyses employed by the Advisor may not produce the desired results. Non-diversification risk: The Fund is a non-diversified investment company, which means that the Fund may invest more of its assets in a smaller number of issuers than a diversified investment company. As a non-diversified fund, the Fund's share price may be more volatile and the Fund has a greater potential to realize losses upon the occurrence of adverse events affecting a particular issuer. 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. 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. Credit risk: The risk that the Fund could lose money if the issuer or guarantor of a fixed income security, or the counterparty to or guarantor of a derivative contract, is unable or unwilling to meet its financial obligations. This risk is likely greater for lower quality investments than for investments that are higher quality. High yield bond risk: The risk that the issuer of bonds with ratings of BB (S&P) or Ba (Moody's) or below, or deemed of equivalent quality, will default or otherwise be unable to honor a financial obligation (also known as lower-rated or "junk bonds"). These securities are considered to be predominately speculative with respect to an issuer's capacity to pay interest and repay principal in accordance with the terms of the obligations. Lower-quality bonds are more likely to be subject to an issuer's default or downgrade than investment grade (higher-quality) bonds.    Interest rate risk: An increase in prevailing interest rates typically causes the value of fixed income securities to fall. Changes in interest rates will likely affect the value of longer-duration fixed income securities more than shorter-duration securities and higher quality securities more than lower quality securities. When interest rates are falling, some fixed income securities provide that the issuer may repay them earlier than the maturity date, and if this occurs the Fund may have to reinvest these repayments at lower interest rates.
Risk Lose Money [Text]	rr_RiskLoseMoney	You may lose money by investing in the Fund.
Risk Nondiversified Status [Text]	rr_RiskNondiversifiedStatus	The Fund is a non-diversified investment company, which means that the Fund may invest more of its assets in a smaller number of issuers than a diversified investment company. As a non-diversified fund, the Fund's share price may be more volatile and the Fund has a greater potential to realize losses upon the occurrence of adverse events affecting a particular issuer.
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	There is no performance information quoted for the Fund as the Fund had not commenced investment operations as of the date of this prospectus.
Performance One Year or Less [Text]	rr_PerformanceOneYearOrLess	There is no performance information quoted for the Fund as the Fund had not commenced investment operations as of the date of this prospectus.
UBS Emerging Markets Equity Fund (Prospectus Summary) | UBS Emerging Markets Equity Fund | Class A
Risk Return [Abstract]	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_MaximumDeferredSalesChargeOverOfferingPrice	none	[1]
Redemption fee (as a percentage of amount redeemed within 90 days of purchase, if applicable)	rr_RedemptionFeeOverRedemption	(1.00%)
Management fees	rr_ManagementFeesOverAssets	1.10%
Distribution and/or service (12b-1) fees	rr_DistributionAndService12b1FeesOverAssets	0.25%
Other expenses	rr_OtherExpensesOverAssets	0.64%	[2]
Total annual fund operating expenses	rr_ExpensesOverAssets	1.99%
Less management fee waiver/expense reimbursements	rr_FeeWaiverOrReimbursementOverAssets	(0.14%)
Total annual fund operating expenses after management fee waiver/expense reimbursements	rr_NetExpensesOverAssets	1.85%	[3]
Fee Waiver or Reimbursement over Assets, Date of Termination	rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination	2013-10-28
Expense Example, with Redemption, 1 Year	rr_ExpenseExampleYear01	728
Expense Example, with Redemption, 3 Years	rr_ExpenseExampleYear03	1,127
UBS Emerging Markets Equity Fund (Prospectus Summary) | UBS Emerging Markets Equity Fund | Class C
Risk Return [Abstract]	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	1.00%
Redemption fee (as a percentage of amount redeemed within 90 days of purchase, if applicable)	rr_RedemptionFeeOverRedemption	(1.00%)
Management fees	rr_ManagementFeesOverAssets	1.10%
Distribution and/or service (12b-1) fees	rr_DistributionAndService12b1FeesOverAssets	1.00%
Other expenses	rr_OtherExpensesOverAssets	0.64%	[2]
Total annual fund operating expenses	rr_ExpensesOverAssets	2.74%
Less management fee waiver/expense reimbursements	rr_FeeWaiverOrReimbursementOverAssets	(0.14%)
Total annual fund operating expenses after management fee waiver/expense reimbursements	rr_NetExpensesOverAssets	2.60%	[3]
Fee Waiver or Reimbursement over Assets, Date of Termination	rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination	2013-10-28
Expense Example, with Redemption, 1 Year	rr_ExpenseExampleYear01	363
Expense Example, with Redemption, 3 Years	rr_ExpenseExampleYear03	836
Expense Example, No Redemption, 1 Year	rr_ExpenseExampleNoRedemptionYear01	263
Expense Example, No Redemption, 3 Years	rr_ExpenseExampleNoRedemptionYear03	836
UBS Emerging Markets Equity Fund (Prospectus Summary) | UBS Emerging Markets Equity Fund | Class Y
Risk Return [Abstract]	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 percentage of amount redeemed within 90 days of purchase, if applicable)	rr_RedemptionFeeOverRedemption	(1.00%)
Management fees	rr_ManagementFeesOverAssets	1.10%
Distribution and/or service (12b-1) fees	rr_DistributionAndService12b1FeesOverAssets	none
Other expenses	rr_OtherExpensesOverAssets	0.64%	[2]
Total annual fund operating expenses	rr_ExpensesOverAssets	1.74%
Less management fee waiver/expense reimbursements	rr_FeeWaiverOrReimbursementOverAssets	(0.14%)
Total annual fund operating expenses after management fee waiver/expense reimbursements	rr_NetExpensesOverAssets	1.60%	[3]
Fee Waiver or Reimbursement over Assets, Date of Termination	rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination	2013-10-28
Expense Example, with Redemption, 1 Year	rr_ExpenseExampleYear01	163
Expense Example, with Redemption, 3 Years	rr_ExpenseExampleYear03	534

[1] 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.

[2] "Other expenses" are based on estimates for the current fiscal year.

[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 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 28, 2013, do not exceed 1.85% for Class A shares, 2.60% for Class C shares and 1.60% 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. 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, the UBS Global AM (Americas)'s three year recoupment rights will survive.

XML

Label	Element	Value
Risk Return [Abstract]	rr_RiskReturnAbstract
ProspectusDate	rr_ProspectusDate	Oct. 29, 2012
UBS Global Allocation Fund (Prospectus Summary) | UBS Global Allocation Fund
Risk Return [Abstract]	rr_RiskReturnAbstract
Risk/Return [Heading]	rr_RiskReturnHeading	UBS Global Allocation 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 43 of the Fund's prospectus and in "Reduced sales charges, additional purchase, exchange and redemption information and other services" on page 107 of the Fund's statement of additional information ("SAI").
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)
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 93% of the average value of its portfolio.
Portfolio Turnover, Rate	rr_PortfolioTurnoverRate	93.00%
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. 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 invests in equity and fixed income securities of issuers located within and outside the United States. Under normal circumstances, the Fund allocates its assets between fixed income securities and equity securities, including securities of issuers in both developed (including the United States) and emerging markets countries. Investments in fixed income securities may include, but are not limited to, debt securities of governments throughout the world (including the United States), their agencies and instrumentalities, debt securities of corporations, mortgage-backed securities and asset-backed securities. These securities will have an initial maturity of more than one year and may be either investment grade or high yield (lower-rated or "junk bonds") securities. Investments in equity securities may include, but are not limited to, common stock and preferred stock. The Fund may invest in other open-end investment companies advised by the Advisor to gain exposure to certain asset classes. 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 index options, futures, forward agreements, swap agreements (specifically, interest rate, credit default and inflation swaps), equity participation notes and equity linked notes. All of these derivatives may be used for risk management purposes, such as hedging against a specific security or currency (except with respect to equity participation notes and equity linked notes), or to manage or adjust the risk profile of the Fund. In addition, all of the derivative instruments listed above may be used for investment (non-hedging) purposes to earn income; to enhance returns; to replace more traditional direct investments; to obtain exposure to certain markets; or to establish net short positions for individual markets, currencies or securities. Futures on indices, forward agreements, interest rate swaps and credit default swaps may also be used to adjust the Fund's portfolio duration. Management process The Fund is a multi-asset fund. Asset allocation decisions are tactical, based upon the Advisor's assessment of valuations and prevailing market conditions in the United States and abroad. In determining the asset allocation of the Fund, the Advisor may utilize fundamental valuation and market behavior indicators to construct the Fund's portfolio. With respect to the Advisor's selection of specific equity securities for inclusion in the Fund's equity asset classes, the Advisor may utilize fundamental valuation and growth-oriented strategies. In selecting equity securities for the Fund using the fundamental valuation process, the Advisor selects securities whose fundamental values (the Advisor's assessment of what a security is worth) it believes are greater than what is reflected in market prices. A stock with a market price below its assessed fundamental value would be considered for inclusion in the Fund's portfolio. Under certain circumstances the Advisor also may utilize a growth-oriented strategy within its equity asset classes. In selecting growth equities, the Advisor seeks to invest in companies that possess a dominant market position and franchise, a major technological edge or a unique competitive advantage. The Advisor's fixed income strategy combines judgments about the absolute value of the fixed income universe and the relative value of issuer sectors, maturity intervals, security durations, credit qualities and coupon segments, as well as specific circumstances facing the issuers of fixed income securities. The Fund's risk is carefully monitored with consideration given to the risk generated by individual position, sector, country and currency views.
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. Interest rate risk: An increase in prevailing interest rates typically causes the value of fixed income securities to fall. Changes in interest rates will likely affect the value of longer-duration fixed income securities more than shorter-duration securities and higher quality securities more than lower quality securities. When interest rates are falling, some fixed income securities provide that the issuer may repay them earlier than the maturity date, and if this occurs the Fund may have to reinvest these repayments at lower interest rates.    Government securities risk: There are different types of US government securities with different levels of credit risk, including 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. Credit risk: The risk that the Fund could lose money if the issuer or guarantor of a fixed income security, or the counterparty to or guarantor of a derivative contract, is unable or unwilling to meet its financial obligations. This risk is likely greater for lower quality investments than for investments that are higher quality. High yield bond risk: The risk that the issuer of bonds with ratings of BB (Standard & Poor's Ratings Group ("S&P")) or Ba (Moody's Investors Service, Inc. ("Moody's")) or below, or deemed of equivalent quality, will default or otherwise be unable to honor a financial obligation (also known as lower-rated or "junk bonds"). These securities are considered to be predominately speculative with respect to an issuer's capacity to pay interest and repay principal in accordance with the terms of the obligations. Lower-quality bonds are more likely to be subject to an issuer's default or downgrade than investment grade (higher-quality) bonds. Market risk: The risk that 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. 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. Investments in foreign government bonds involve special risks because the Fund may have limited legal recourse in the event of default. Also, foreign securities are sometimes less liquid and more difficult to sell and to value than securities of US issuers. These risks are greater for investments in emerging market issuers. In addition, investments in emerging market issuers may decline in value because of unfavorable foreign government actions, greater risks of political instability or the absence of accurate information about emerging market issuers. Asset allocation risk: The risk that the Fund may allocate assets to an asset category that performs poorly relative to other asset categories. 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. Derivatives relating to fixed income markets are especially susceptible to interest rate risk and credit risk. In addition, many types of swaps and other 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. Investing in other funds risks: The Fund's investment performance is affected by the investment performance of the underlying funds in which the Fund may invest. Through its investment in the underlying funds, the Fund is subject to the risks of the underlying funds' investments and subject to the underlying funds' expenses. Management risk: The risk that the investment strategies, techniques and risk analyses employed by the Advisor may not produce the desired results.
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. The MSCI World Free Index (net) shows how the Fund's performance compares to an index that is designed to measure the equity market performance of developed markets. The Citigroup World Government Bond Index shows how the Fund's performance compares to an index composed of straight (i.e., not floating rate or index-linked) government bonds with a one-year minimum maturity. The GSMI Mutual Fund Index shows how the Fund's performance compares to an index compiled by the Advisor that is constructed as follows: 65% MSCI All Country World Index (net), 15% Citigroup World Government Bond ex US Index, 15% Citigroup US Government Bond Index, 2% J.P. Morgan Emerging Markets Bond Index Global (EMBI Global) and 3% BofA Merrill Lynch US High Yield Cash Pay Constrained Index. Indices reflect no deduction for fees, expenses or taxes, except for the MSCI World Free Index (net) which reflects no deduction for fees and expenses. 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 Returns [Text]	rr_PerformanceInformationIllustratesVariabilityOfReturns	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.
Performance Availability Website Address [Text]	rr_PerformanceAvailabilityWebSiteAddress	http://globalam-us.ubs.com/corpweb/performance.do
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	UBS Global Allocation Fund Annual Total Returns of Class Y Shares
Bar Chart Closing [Text Block]	rr_BarChartClosingTextBlock	Total return January 1 - September 30, 2012: 9.61% Best quarter during calendar years shown-2Q 2009: 23.56% Worst quarter during calendar years shown-4Q 2008: (21.44)%
Index No Deduction for Fees, Expenses, Taxes [Text]	rr_IndexNoDeductionForFeesExpensesTaxes	Indices reflect no deduction for fees, expenses or taxes, except for the MSCI World Free Index (net) which reflects no deduction for fees and expenses.
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	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 Y shares' after-tax returns shown.
Caption	rr_AverageAnnualReturnCaption	Average annual total returns (for the periods ended December 31, 2011)
UBS Global Allocation Fund (Prospectus Summary) | UBS Global Allocation Fund | Russell 3000 Index
Risk Return [Abstract]	rr_RiskReturnAbstract
Label	rr_AverageAnnualReturnLabel	Russell 3000 Index
1 Year	rr_AverageAnnualReturnYear01	1.03%
5 Years	rr_AverageAnnualReturnYear05	(0.01%)
10 Years	rr_AverageAnnualReturnYear10	3.52%
UBS Global Allocation Fund (Prospectus Summary) | UBS Global Allocation Fund | MSCI World Free Index (net)
Risk Return [Abstract]	rr_RiskReturnAbstract
Label	rr_AverageAnnualReturnLabel	MSCI World Free Index (net)
1 Year	rr_AverageAnnualReturnYear01	(5.54%)
5 Years	rr_AverageAnnualReturnYear05	(2.37%)
10 Years	rr_AverageAnnualReturnYear10	3.62%
UBS Global Allocation Fund (Prospectus Summary) | UBS Global Allocation Fund | Citigroup World Government Bond Index
Risk Return [Abstract]	rr_RiskReturnAbstract
Label	rr_AverageAnnualReturnLabel	Citigroup World Government Bond Index
1 Year	rr_AverageAnnualReturnYear01	6.35%
5 Years	rr_AverageAnnualReturnYear05	7.13%
10 Years	rr_AverageAnnualReturnYear10	7.77%
UBS Global Allocation Fund (Prospectus Summary) | UBS Global Allocation Fund | GSMI Mutual Fund Index
Risk Return [Abstract]	rr_RiskReturnAbstract
Label	rr_AverageAnnualReturnLabel	GSMI Mutual Fund Index
1 Year	rr_AverageAnnualReturnYear01	(2.14%)
5 Years	rr_AverageAnnualReturnYear05	1.56%
10 Years	rr_AverageAnnualReturnYear10	5.62%
UBS Global Allocation Fund (Prospectus Summary) | UBS Global Allocation Fund | Class A
Risk Return [Abstract]	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_MaximumDeferredSalesChargeOverOfferingPrice	none	[1]
Redemption fee (as a % of amount redeemed within 90 days of purchase, if applicable)	rr_RedemptionFeeOverRedemption	(1.00%)
Management fees	rr_ManagementFeesOverAssets	0.77%
Distribution and/or service (12b-1) fees	rr_DistributionAndService12b1FeesOverAssets	0.25%
Other expenses	rr_OtherExpensesOverAssets	0.23%
Acquired fund fees and expenses	rr_AcquiredFundFeesAndExpensesOverAssets	0.06%
Total annual fund operating expenses	rr_ExpensesOverAssets	1.31%	[2]
Expense Example, with Redemption, 1 Year	rr_ExpenseExampleYear01	676
Expense Example, with Redemption, 3 Years	rr_ExpenseExampleYear03	942
Expense Example, with Redemption, 5 Years	rr_ExpenseExampleYear05	1,229
Expense Example, with Redemption, 10 Years	rr_ExpenseExampleYear10	2,042
Label	rr_AverageAnnualReturnLabel	Class A Return before taxes
1 Year	rr_AverageAnnualReturnYear01	(12.77%)
5 Years	rr_AverageAnnualReturnYear05	(2.44%)
10 Years	rr_AverageAnnualReturnYear10	4.17%
Inception Date	rr_AverageAnnualReturnInceptionDate	Jun. 30, 1997
UBS Global Allocation Fund (Prospectus Summary) | UBS Global Allocation Fund | Class C
Risk Return [Abstract]	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	1.00%
Redemption fee (as a % of amount redeemed within 90 days of purchase, if applicable)	rr_RedemptionFeeOverRedemption	(1.00%)
Management fees	rr_ManagementFeesOverAssets	0.77%
Distribution and/or service (12b-1) fees	rr_DistributionAndService12b1FeesOverAssets	1.00%
Other expenses	rr_OtherExpensesOverAssets	0.25%
Acquired fund fees and expenses	rr_AcquiredFundFeesAndExpensesOverAssets	0.06%
Total annual fund operating expenses	rr_ExpensesOverAssets	2.08%	[2]
Expense Example, with Redemption, 1 Year	rr_ExpenseExampleYear01	311
Expense Example, with Redemption, 3 Years	rr_ExpenseExampleYear03	652
Expense Example, with Redemption, 5 Years	rr_ExpenseExampleYear05	1,119
Expense Example, with Redemption, 10 Years	rr_ExpenseExampleYear10	2,410
Expense Example, No Redemption, 1 Year	rr_ExpenseExampleNoRedemptionYear01	211
Expense Example, No Redemption, 3 Years	rr_ExpenseExampleNoRedemptionYear03	652
Expense Example, No Redemption, 5 Years	rr_ExpenseExampleNoRedemptionYear05	1,119
Expense Example, No Redemption, 10 Years	rr_ExpenseExampleNoRedemptionYear10	2,410
Label	rr_AverageAnnualReturnLabel	Class C Return before taxes	[3]
1 Year	rr_AverageAnnualReturnYear01	(9.17%)
5 Years	rr_AverageAnnualReturnYear05	(2.09%)
10 Years	rr_AverageAnnualReturnYear10	3.94%
Inception Date	rr_AverageAnnualReturnInceptionDate	Nov. 22, 2001
UBS Global Allocation Fund (Prospectus Summary) | UBS Global Allocation Fund | Class Y
Risk Return [Abstract]	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 fees	rr_ManagementFeesOverAssets	0.77%
Distribution and/or service (12b-1) fees	rr_DistributionAndService12b1FeesOverAssets	none
Other expenses	rr_OtherExpensesOverAssets	0.18%
Acquired fund fees and expenses	rr_AcquiredFundFeesAndExpensesOverAssets	0.06%
Total annual fund operating expenses	rr_ExpensesOverAssets	1.01%	[2]
Expense Example, with Redemption, 1 Year	rr_ExpenseExampleYear01	103
Expense Example, with Redemption, 3 Years	rr_ExpenseExampleYear03	322
Expense Example, with Redemption, 5 Years	rr_ExpenseExampleYear05	558
Expense Example, with Redemption, 10 Years	rr_ExpenseExampleYear10	1,236
Annual Return 2002	rr_AnnualReturn2002	(3.06%)
Annual Return 2003	rr_AnnualReturn2003	27.79%
Annual Return 2004	rr_AnnualReturn2004	14.53%
Annual Return 2005	rr_AnnualReturn2005	6.46%
Annual Return 2006	rr_AnnualReturn2006	13.86%
Annual Return 2007	rr_AnnualReturn2007	5.01%
Annual Return 2008	rr_AnnualReturn2008	(35.88%)
Annual Return 2009	rr_AnnualReturn2009	35.68%
Annual Return 2010	rr_AnnualReturn2010	12.11%
Annual Return 2011	rr_AnnualReturn2011	(7.37%)
Year to Date Return, Label	rr_YearToDateReturnLabel	Total return January 1 - September 30, 2012:
Bar Chart, Year to Date Return, Date	rr_BarChartYearToDateReturnDate	Sep. 30, 2012
Bar Chart, Year to Date Return	rr_BarChartYearToDateReturn	9.61%
Highest Quarterly Return, Label	rr_HighestQuarterlyReturnLabel	Best quarter during calendar years shown-2Q 2009:
Highest Quarterly Return, Date	rr_BarChartHighestQuarterlyReturnDate	Jun. 30, 2009
Highest Quarterly Return	rr_BarChartHighestQuarterlyReturn	23.56%
Lowest Quarterly Return, Label	rr_LowestQuarterlyReturnLabel	Worst quarter during calendar years shown-4Q 2008:
Lowest Quarterly Return, Date	rr_BarChartLowestQuarterlyReturnDate	Dec. 31, 2008
Lowest Quarterly Return	rr_BarChartLowestQuarterlyReturn	(21.44%)
Label	rr_AverageAnnualReturnLabel	Class Y Return before taxes
1 Year	rr_AverageAnnualReturnYear01	(7.37%)
5 Years	rr_AverageAnnualReturnYear05	(1.05%)
10 Years	rr_AverageAnnualReturnYear10	5.02%
Inception Date	rr_AverageAnnualReturnInceptionDate	Aug. 31, 1992
UBS Global Allocation Fund (Prospectus Summary) | UBS Global Allocation Fund | Class Y | After Taxes on Distributions
Risk Return [Abstract]	rr_RiskReturnAbstract
Label	rr_AverageAnnualReturnLabel	Class Y Return after taxes on distributions
1 Year	rr_AverageAnnualReturnYear01	(8.66%)
5 Years	rr_AverageAnnualReturnYear05	(3.08%)
10 Years	rr_AverageAnnualReturnYear10	3.36%
Inception Date	rr_AverageAnnualReturnInceptionDate	Aug. 31, 1992
UBS Global Allocation Fund (Prospectus Summary) | UBS Global Allocation Fund | Class Y | After Taxes on Distributions and Sales
Risk Return [Abstract]	rr_RiskReturnAbstract
Label	rr_AverageAnnualReturnLabel	Class Y Return after taxes on distributions and sale of fund shares
1 Year	rr_AverageAnnualReturnYear01	(4.47%)
5 Years	rr_AverageAnnualReturnYear05	(1.81%)
10 Years	rr_AverageAnnualReturnYear10	3.62%
Inception Date	rr_AverageAnnualReturnInceptionDate	Aug. 31, 1992

[1] 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.

[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" will differ from those presented in the Financial highlights.

[3] 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 annual average returns presented for the Class C shares shown above.

XML

Label	Element	Value
Risk Return [Abstract]	rr_RiskReturnAbstract
ProspectusDate	rr_ProspectusDate	Oct. 29, 2012
UBS Fixed Income Opportunities Fund (Prospectus Summary) | UBS Fixed Income Opportunities Fund
Risk Return [Abstract]	rr_RiskReturnAbstract
Risk/Return [Heading]	rr_RiskReturnHeading	UBS Fixed Income Opportunities 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 34 of the Fund's prospectus and in "Reduced sales charges, additional purchase, exchange and redemption information and other services" on page 107 of the Fund's statement of additional information ("SAI").
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)
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 63% of the average value of its portfolio.
Portfolio Turnover, Rate	rr_PortfolioTurnoverRate	63.00%
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 The Fund seeks to achieve its investment objective by investing its assets across a wide range of fixed income securities, currencies and other investments to generate total returns under a variety of market conditions and economic cycles. The Fund may invest in fixed income securities of US and non-US issuers located in developed and emerging market countries. Under normal circumstances, the Fund invests at least 80% of its net assets (plus borrowings for investment purposes, if any) in fixed income securities and/or investments that provide exposure to fixed income securities. Investments in fixed income securities may include, but are not limited to, securities of governments throughout the world (including the United States), their agencies and instrumentalities, cash equivalents, debt securities of supranationals and corporations including trust-preferred securities, convertible securities, mortgage-backed securities, asset-backed securities, inflation-linked securities, equipment trusts and other securitized or collateralized debt securities. The Fund's investments in fixed income securities may have all types of interest rate payment and reset terms, including fixed rate, adjustable rate, zero coupon, pay-in-kind and auction rate features. In addition, the fixed income securities purchased by the Fund may be denominated in any currency, have coupons payable in any currency and may be of any maturity or duration. The Fund may invest in fixed income securities of any credit quality, including non-investment grade securities (often referred to as high yield securities or "junk bonds"). The Fund expects to use exchange traded and/or over-the-counter derivative instruments extensively in employing its long/short, globally-oriented fixed income and currency strategy. Generally, derivatives are financial contracts whose value depends upon, or is derived from, the value of an underlying asset, reference rate, or index, and may relate to stocks, bonds, interest rates, currencies or currency exchange rates, and related indexes. The derivatives in which the Fund may invest include, but are not limited to, options (including, but not limited to, options on futures, forwards and swap agreements), futures, forward agreements, swap agreements (including, but not limited to, interest rate, total return, currency, credit default and inflation swaps), credit-linked securities, caps, floors, collars, structured notes and other derivative instruments. The Fund may invest in derivatives to the extent permitted by the Investment Company Act of 1940, as amended (the "1940 Act"). The Fund may use derivatives for hedging or non-hedging purposes. The Fund intends to use derivatives to earn income and enhance returns, to manage or adjust the risk profile of the Fund, to replace more traditional direct investments, or to obtain exposure to certain markets. The Fund also may use derivatives to establish net short positions for individual markets, currencies and securities or to adjust the Fund's portfolio duration. In addition, the Fund may establish short positions in fixed income securities through the use of any of the derivative instruments listed above to achieve a negative portfolio duration in an effort to take advantage of periods of rising interest rates and provide the potential for appreciation. The Advisor expects that the duration of the Fund's portfolio will be between approximately +5 years and -5 years depending on the level and expected future direction of interest rates. Duration measures a fixed income security's price sensitivity to interest rates by indicating the approximate change in a fixed income security's price if interest rates move up or down in 1% increments. For example, when the level of interest rates increases by 1%, the price of a fixed income security or a portfolio of fixed income securities having a positive duration of five years generally will decrease by approximately 5% and the price of a fixed income security or a portfolio of fixed income securities having a negative duration of five years generally will increase by approximately 5%. Conversely when the level of interest rates decreases by 1%, the price of a fixed income security or a portfolio of fixed income securities having a positive duration of five years generally will increase by approximately 5% and the price of a fixed income security or a portfolio of fixed income securities having a negative duration of five years generally will decrease by approximately 5%. Management process In employing its investment strategies for the Fund, the Advisor attempts to generate total returns by managing the risks and market exposures of the Fund's portfolio. The Fund utilizes a long/short, global fixed income and currency strategy that emphasizes relative value investing. The Fund pursues a diversified investment strategy and the Advisor has substantial latitude to invest across broad fixed income and currency markets. At times, the unconstrained investment approach may lead the Advisor to have sizable allocations to particular markets, sectors and industries. The Advisor implements the long/short strategy across multiple dimensions to gain specific exposure to investments that it believes offer an attractive risk-reward opportunity. Typically, the Advisor seeks to exploit opportunities, both long and short, where the market valuation of a particular security differs from the Advisor's valuation for the same security. The Advisor actively manages the Fund's currency exposure and attempts to generate total returns and manage risk by identifying relative valuation discrepancies among global currencies as well as implementing hedging strategies to limit unwanted currency risks. These decisions are integrated within the macroeconomic framework analysis of global market and economic conditions. In employing its investment strategies for the Fund, the Advisor attempts to achieve a total rate of return for the Fund which exceeds the rate of return on 3 Month LIBOR (a short-term interest rate that banks charge one another and that is generally representative of short-term interest rates) by 3% for Class A shares, 2.5% for Class C shares, and 3.25% for Class Y shares, each net of fund ordinary operating expenses over rolling five year time horizons. The Advisor does not represent or guarantee that the Fund will meet this total return goal. The Fund is not a money market, stable net asset value, cash alternative, or a traditional long only fixed income fund. The Fund seeks to maximize total return, consisting of capital appreciation and current income by investing in global fixed income and currency markets. At times, the Fund may have exposures to higher risk strategies within the fixed income and currency markets, and it may take both long and short positions utilizing various instruments including the extensive use of derivatives. Furthermore, given the Fund's less constrained investment approach, it may maintain overall net short positions in any particular market. While the Advisor will seek to manage the Fund's volatility and overall risk exposure in a prudent manner, it is quite possible that the Fund may exhibit negative returns in any particular month, quarter or a year.
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 risk that 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. Interest rate risk: An increase in prevailing interest rates typically causes the value of fixed income securities to fall. When the Fund has a negative portfolio duration, a decline in interest rates may negatively impact the Fund's value. Changes in interest rates will likely affect the value of longer-duration fixed income securities more than shorter-duration securities and higher quality securities more than lower quality securities. When interest rates are falling, some fixed income securities provide that the issuer may repay them earlier than the maturity date, and if this occurs the Fund may have to reinvest these repayments at lower interest rates. Credit risk: The risk that the Fund could lose money if the issuer or guarantor of a fixed income security, or the counterparty to or guarantor of a derivative contract, is unable or unwilling to meet its financial obligations. This risk is likely greater for lower quality investments than for investments that are higher quality. 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. Investments in foreign government bonds involve special risks because the Fund may have limited legal recourse in the event of default. Also, foreign securities are sometimes less liquid and more difficult to sell and to value than securities of US issuers. These risks are greater for investments in emerging market issuers. In addition, investments in emerging market issuers may decline in value because of unfavorable foreign government actions, greater risks of political instability or the absence of accurate information about emerging market issuers.    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. High yield bond risk: The risk that the issuer of bonds with ratings of BB (Standard & Poor's Ratings Group ("S&P")) or Ba (Moody's Investors Service, Inc. ("Moody's")) or below, or deemed of equivalent quality, will default or otherwise be unable to honor a financial obligation (also known as lower-rated or "junk bonds"). These securities are considered to be predominately speculative with respect to an issuer's capacity to pay interest and repay principal in accordance with the terms of the obligations. Lower-quality bonds are more likely to be subject to an issuer's default or downgrade than investment grade (higher-quality) bonds. Illiquidity risk: The risk that investments cannot be readily sold at the desired time or price, and the Fund may have to accept a lower price or may not be able to sell the security at all. An inability to sell securities can adversely affect the Fund's value or prevent the Fund from taking advantage of other investment opportunities. 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. Derivatives relating to fixed income markets are especially susceptible to interest rate risk and credit risk. In addition, many types of swaps and other 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. Investing in other funds risks: The Fund's investment performance is affected by the investment performance of the underlying funds in which the Fund may invest. Through its investment in the underlying funds, the Fund is subject to the risks of the underlying funds' investments and subject to the underlying funds' expenses. Management risk: The risk that the investment strategies, techniques and risk analyses employed by the Advisor may not produce the desired results.
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 the Fund's performance for the year 2011 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 Returns [Text]	rr_PerformanceInformationIllustratesVariabilityOfReturns	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 the Fund's performance for the year 2011 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	http://globalam-us.ubs.com/corpweb/performance.do
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	UBS Fixed Income Opportunities Fund Annual Total Returns of Class Y Shares (2011 is the Fund's first full year of operations)
Bar Chart Closing [Text Block]	rr_BarChartClosingTextBlock	Total return January 1 - September 30, 2012: 6.22% Best quarter during calendar year shown-1Q 2011: 0.88% Worst quarter during calendar year shown-2Q 2011: (2.20)%
Index No Deduction for Fees, Expenses, Taxes [Text]	rr_IndexNoDeductionForFeesExpensesTaxes	Index reflects no deduction for fees, expenses or taxes.
Performance Table Uses Highest Federal Rate	rr_PerformanceTableUsesHighestFederalRate	The Fund's past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future.
Performance Table Not Relevant to Tax Deferred	rr_PerformanceTableNotRelevantToTaxDeferred	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 Y shares' after-tax returns shown.
Caption	rr_AverageAnnualReturnCaption	Average annual total returns (for the periods ended December 31, 2011)
UBS Fixed Income Opportunities Fund (Prospectus Summary) | UBS Fixed Income Opportunities Fund | BofA Merrill Lynch US Dollar 3-Month LIBOR Constant Maturity Index
Risk Return [Abstract]	rr_RiskReturnAbstract
Label	rr_AverageAnnualReturnLabel	BofA Merrill Lynch US Dollar 3-Month LIBOR Constant Maturity Index
1 Year	rr_AverageAnnualReturnYear01	0.27%
Since Inception	rr_AverageAnnualReturnSinceInception	0.27%
UBS Fixed Income Opportunities Fund (Prospectus Summary) | UBS Fixed Income Opportunities Fund | Class A
Risk Return [Abstract]	rr_RiskReturnAbstract
Maximum front-end sales charge (load) imposed on purchases (as a % of offering price)	rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice	4.50%
Maximum contingent deferred sales charge (load) (CDSC) (as a % of purchase or sales price, whichever is less)	rr_MaximumDeferredSalesChargeOverOfferingPrice	none	[1]
Redemption fee (as a % of amount redeemed within 90 days of purchase, if applicable)	rr_RedemptionFeeOverRedemption	(1.00%)
Management fees	rr_ManagementFeesOverAssets	0.65%
Distribution and/or service (12b-1) fees	rr_DistributionAndService12b1FeesOverAssets	0.25%
Other expenses	rr_OtherExpensesOverAssets	0.52%
Acquired fund fees and expenses	rr_AcquiredFundFeesAndExpensesOverAssets	0.09%
Total annual fund operating expenses	rr_ExpensesOverAssets	1.51%	[2]
Less management fee waiver/expense reimbursements	rr_FeeWaiverOrReimbursementOverAssets	(0.47%)
Total annual fund operating expenses after management fee waiver/expense reimbursements	rr_NetExpensesOverAssets	1.04%	[2],[3]
Fee Waiver or Reimbursement over Assets, Date of Termination	rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination	2013-10-28
Expense Example, with Redemption, 1 Year	rr_ExpenseExampleYear01	551
Expense Example, with Redemption, 3 Years	rr_ExpenseExampleYear03	862
Expense Example, with Redemption, 5 Years	rr_ExpenseExampleYear05	1,194
Expense Example, with Redemption, 10 Years	rr_ExpenseExampleYear10	2,132
Label	rr_AverageAnnualReturnLabel	Class A Return before taxes
1 Year	rr_AverageAnnualReturnYear01	(6.17%)
Since Inception	rr_AverageAnnualReturnSinceInception	(3.76%)
Inception Date	rr_AverageAnnualReturnInceptionDate	Nov. 29, 2010
UBS Fixed Income Opportunities Fund (Prospectus Summary) | UBS Fixed Income Opportunities Fund | Class C
Risk Return [Abstract]	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	0.75%
Redemption fee (as a % of amount redeemed within 90 days of purchase, if applicable)	rr_RedemptionFeeOverRedemption	(1.00%)
Management fees	rr_ManagementFeesOverAssets	0.65%
Distribution and/or service (12b-1) fees	rr_DistributionAndService12b1FeesOverAssets	0.75%
Other expenses	rr_OtherExpensesOverAssets	0.53%
Acquired fund fees and expenses	rr_AcquiredFundFeesAndExpensesOverAssets	0.09%
Total annual fund operating expenses	rr_ExpensesOverAssets	2.02%	[2]
Less management fee waiver/expense reimbursements	rr_FeeWaiverOrReimbursementOverAssets	(0.48%)
Total annual fund operating expenses after management fee waiver/expense reimbursements	rr_NetExpensesOverAssets	1.54%	[2],[3]
Fee Waiver or Reimbursement over Assets, Date of Termination	rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination	2013-10-28
Expense Example, with Redemption, 1 Year	rr_ExpenseExampleYear01	232
Expense Example, with Redemption, 3 Years	rr_ExpenseExampleYear03	587
Expense Example, with Redemption, 5 Years	rr_ExpenseExampleYear05	1,044
Expense Example, with Redemption, 10 Years	rr_ExpenseExampleYear10	2,310
Expense Example, No Redemption, 1 Year	rr_ExpenseExampleNoRedemptionYear01	157
Expense Example, No Redemption, 3 Years	rr_ExpenseExampleNoRedemptionYear03	587
Expense Example, No Redemption, 5 Years	rr_ExpenseExampleNoRedemptionYear05	1,044
Expense Example, No Redemption, 10 Years	rr_ExpenseExampleNoRedemptionYear10	2,310
Label	rr_AverageAnnualReturnLabel	Class C Return before taxes
1 Year	rr_AverageAnnualReturnYear01	(2.91%)
Since Inception	rr_AverageAnnualReturnSinceInception	(0.14%)
Inception Date	rr_AverageAnnualReturnInceptionDate	Nov. 29, 2010
UBS Fixed Income Opportunities Fund (Prospectus Summary) | UBS Fixed Income Opportunities Fund | Class Y
Risk Return [Abstract]	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 fees	rr_ManagementFeesOverAssets	0.65%
Distribution and/or service (12b-1) fees	rr_DistributionAndService12b1FeesOverAssets	none
Other expenses	rr_OtherExpensesOverAssets	0.49%
Acquired fund fees and expenses	rr_AcquiredFundFeesAndExpensesOverAssets	0.09%
Total annual fund operating expenses	rr_ExpensesOverAssets	1.23%	[2]
Less management fee waiver/expense reimbursements	rr_FeeWaiverOrReimbursementOverAssets	(0.44%)
Total annual fund operating expenses after management fee waiver/expense reimbursements	rr_NetExpensesOverAssets	0.79%	[2],[3]
Fee Waiver or Reimbursement over Assets, Date of Termination	rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination	2013-10-28
Expense Example, with Redemption, 1 Year	rr_ExpenseExampleYear01	81
Expense Example, with Redemption, 3 Years	rr_ExpenseExampleYear03	347
Expense Example, with Redemption, 5 Years	rr_ExpenseExampleYear05	633
Expense Example, with Redemption, 10 Years	rr_ExpenseExampleYear10	1,450
Annual Return 2011	rr_AnnualReturn2011	(1.53%)
Year to Date Return, Label	rr_YearToDateReturnLabel	Total return January 1 - September 30, 2012:
Bar Chart, Year to Date Return, Date	rr_BarChartYearToDateReturnDate	Sep. 30, 2012
Bar Chart, Year to Date Return	rr_BarChartYearToDateReturn	6.22%
Highest Quarterly Return, Label	rr_HighestQuarterlyReturnLabel	Best quarter during calendar year shown-1Q 2011:
Highest Quarterly Return, Date	rr_BarChartHighestQuarterlyReturnDate	Mar. 31, 2011
Highest Quarterly Return	rr_BarChartHighestQuarterlyReturn	0.88%
Lowest Quarterly Return, Label	rr_LowestQuarterlyReturnLabel	Worst quarter during calendar year shown-2Q 2011:
Lowest Quarterly Return, Date	rr_BarChartLowestQuarterlyReturnDate	Jun. 30, 2001
Lowest Quarterly Return	rr_BarChartLowestQuarterlyReturn	(2.20%)
Label	rr_AverageAnnualReturnLabel	Class Y Return before taxes
1 Year	rr_AverageAnnualReturnYear01	(1.53%)
Since Inception	rr_AverageAnnualReturnSinceInception	0.71%
Inception Date	rr_AverageAnnualReturnInceptionDate	Nov. 29, 2010
UBS Fixed Income Opportunities Fund (Prospectus Summary) | UBS Fixed Income Opportunities Fund | Class Y | After Taxes on Distributions
Risk Return [Abstract]	rr_RiskReturnAbstract
Label	rr_AverageAnnualReturnLabel	Class Y Return after taxes on distributions
1 Year	rr_AverageAnnualReturnYear01	(2.90%)
Since Inception	rr_AverageAnnualReturnSinceInception	(0.65%)
Inception Date	rr_AverageAnnualReturnInceptionDate	Nov. 29, 2010
UBS Fixed Income Opportunities Fund (Prospectus Summary) | UBS Fixed Income Opportunities Fund | Class Y | After Taxes on Distributions and Sales
Risk Return [Abstract]	rr_RiskReturnAbstract
Label	rr_AverageAnnualReturnLabel	Class Y Return after taxes on distributions and sale of fund shares
1 Year	rr_AverageAnnualReturnYear01	(0.62%)
Since Inception	rr_AverageAnnualReturnSinceInception	(0.01%)
Inception Date	rr_AverageAnnualReturnInceptionDate	Nov. 29, 2010

[1] 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.

[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, and 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, and dividend expense and security loan fees for securities sold short), through the period ending October 28, 2013, do not exceed 0.95% for Class A shares, 1.45% for Class C shares and 0.70% 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. 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, the UBS Global AM (Americas)'s three year recoupment rights will survive.

XML

UBS U.S. Real Estate Equity Fund (Prospectus Summary) | UBS U.S. Real Estate Equity Fund

UBS U.S. Real Estate Equity Fund

Investment objective

The Fund seeks to maximize total return, consisting of capital appreciation
and current income.

Fees and expenses

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 20 of the Fund's
prospectus and in "Reduced sales charges, additional purchase, exchange and
redemption information and other services" on page 63 of the Fund's statement of
additional information ("SAI").

Shareholder fees (fees paid directly from your investment)

Shareholder Fees UBS U.S. Real Estate Equity Fund	Class A		Class C	Class Y
Maximum front-end sales charge (load) imposed on purchases (as a % of offering price)	5.50%		none	none
Maximum contingent deferred sales charge (load) (CDSC) (as a % of purchase or sales price, whichever is less)	none	[1]	1.00%	none
Redemption fee (as a percentage of amount redeemed within 90 days of purchase, if applicable)	1.00%		1.00%	1.00%

Annual fund operating expenses (expenses that you pay each year as a percentage of the value of your investment)

Annual Fund Operating Expenses UBS U.S. Real Estate Equity Fund		Class A	Class C	Class Y
Management fees		0.90%	0.90%	0.90%
Distribution and/or service (12b-1) fees		0.25%	1.00%	none
Other expenses	[1]	0.49%	0.49%	0.49%
Total annual fund operating expenses		1.64%	2.39%	1.39%
Less management fee waiver/expense reimbursements		0.34%	0.34%	0.34%
Total annual fund operating expenses after management fee waiver/expense reimbursements	[2]	1.30%	2.05%	1.05%

Example

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:

Expense Example UBS U.S. Real Estate Equity Fund (USD $)	Expense Example, with Redemption, 1 Year	Expense Example, with Redemption, 3 Years
Class A	675	1,007
Class C	308	713
Class Y	107	407

Expense Example, No Redemption (USD $)	Expense Example, No Redemption, 1 Year	Expense Example, No Redemption, 3 Years
UBS U.S. Real Estate Equity Fund Class C	208	713

Portfolio turnover

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.

Principal strategies

Principal investments

Under normal circumstances, the Fund invests at least 80% of its net assets
(plus borrowings for investment purposes, if any) in real estate equity
securities of US issuers. These may include real estate investment trusts
("REITs") that own properties or make construction or mortgage loans, real
estate developers and companies with substantial real estate holdings and other
companies whose products and services are related to the real estate industry,
and derive 50% of their assets, gross income or net profits from the real estate
industry, such as building supply manufacturers, mortgage lenders, or mortgage
service companies. REITs and other real estate securities may be of any market
capitalization, including small capitalization ($3 billion or less). Investments
in equity securities may include, but are not limited to, common stock and
preferred stock. The Fund is a non-diversified fund.

The Fund may, but is not required to, use 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 on indices, which may
be used for risk management purposes to manage or adjust the risk profile of the
Fund. 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 Fund is a sector fund, a category of funds created in response to changing
market conditions and for the varied and dynamic needs of shareholders. The Fund
focuses on the real estate sector, generally a narrower market segment than many
other funds, and may be considered a complement to a diversified investment
program. In selecting securities, the Advisor focuses on securities offering the
most compelling combination of quality, growth and relative valuation. For each
security under analysis, the Advisor bases its assessment of value upon
economic, industry and company analysis, as well as upon a company's management
team, property portfolio and core competencies.

The Advisor actively manages the Fund. As such, increased portfolio turnover may
result in higher costs for brokerage commissions, transaction costs and taxable
gains.

Main risks

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.

Industry concentration risk: The risk that changes in economic, political or
other conditions may have a particularly negative effect on issuers in an
industry or sector in which the Fund's investments are concentrated. The Fund
invests principally in the real estate sector by purchasing securities issued by
REITs. There is, therefore, a risk that changes in real estate values or
interest rates, along with economic downturns, can have a substantial impact on
the Fund's investments. The Fund's portfolio may be more volatile than a Fund
with a broader range of investments.

Prepayment or call risk: As a result of declining interest rates, the issuer of
a security may exercise its right to prepay principal earlier than scheduled,
forcing the Fund to reinvest in lower yielding securities. This is known as call
or prepayment risk.

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.

Non-diversification risk: The Fund is a non-diversified investment company,
which means that the Fund may invest more of its assets in a smaller number of
issuers than a diversified investment company. As a non-diversified fund, the
Fund's share price may be more volatile and the Fund has a greater potential to
realize losses upon the occurrence of adverse events affecting a particular
issuer.

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. 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.

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

Performance

There is no performance information quoted for the Fund as the Fund had not
commenced investment operations as of the date of this prospectus.

[1] 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.

[1] "Other expenses" are based on estimates for the current fiscal year.

[2] 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 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 28, 2013, do not exceed 1.30% for Class A shares, 2.05% for Class C shares and 1.05% 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. 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, the UBS Global AM (Americas)'s three year recoupment rights will survive.

XML

Label	Element	Value
Risk Return [Abstract]	rr_RiskReturnAbstract
Document Type	dei_DocumentType	485BPOS
Document Period End Date	dei_DocumentPeriodEndDate	Jun. 30, 2012
Registrant Name	dei_EntityRegistrantName	UBS FUNDS
Central Index Key	dei_EntityCentralIndexKey	0000886244
Amendment Flag	dei_AmendmentFlag	false
Document Creation Date	dei_DocumentCreationDate	Oct. 29, 2012
Document Effective Date	dei_DocumentEffectiveDate	Oct. 29, 2012
UBS Dynamic Alpha Fund (Prospectus Summary) | UBS Dynamic Alpha Fund | Class A
Risk Return [Abstract]	rr_RiskReturnAbstract
Trading Symbol	dei_TradingSymbol	BNAAX
UBS Dynamic Alpha Fund (Prospectus Summary) | UBS Dynamic Alpha Fund | Class C
Risk Return [Abstract]	rr_RiskReturnAbstract
Trading Symbol	dei_TradingSymbol	BNACX
UBS Dynamic Alpha Fund (Prospectus Summary) | UBS Dynamic Alpha Fund | Class Y
Risk Return [Abstract]	rr_RiskReturnAbstract
Trading Symbol	dei_TradingSymbol	BNAYX
UBS Global Allocation Fund (Prospectus Summary) | UBS Global Allocation Fund | Class A
Risk Return [Abstract]	rr_RiskReturnAbstract
Trading Symbol	dei_TradingSymbol	BNGLX
UBS Global Allocation Fund (Prospectus Summary) | UBS Global Allocation Fund | Class C
Risk Return [Abstract]	rr_RiskReturnAbstract
Trading Symbol	dei_TradingSymbol	BNPCX
UBS Global Allocation Fund (Prospectus Summary) | UBS Global Allocation Fund | Class Y
Risk Return [Abstract]	rr_RiskReturnAbstract
Trading Symbol	dei_TradingSymbol	BPGLX
UBS Global Frontier Fund (Prospectus Summary) | UBS Global Frontier Fund | Class A
Risk Return [Abstract]	rr_RiskReturnAbstract
Trading Symbol	dei_TradingSymbol	BGFAX
UBS Global Frontier Fund (Prospectus Summary) | UBS Global Frontier Fund | Class C
Risk Return [Abstract]	rr_RiskReturnAbstract
Trading Symbol	dei_TradingSymbol	BGFCX
UBS Global Frontier Fund (Prospectus Summary) | UBS Global Frontier Fund | Class Y
Risk Return [Abstract]	rr_RiskReturnAbstract
Trading Symbol	dei_TradingSymbol	BGFYX
UBS Multi-Asset Income Fund (Prospectus Summary) | UBS Multi-Asset Income Fund | Class A
Risk Return [Abstract]	rr_RiskReturnAbstract
Trading Symbol	dei_TradingSymbol	MAIAX
UBS Multi-Asset Income Fund (Prospectus Summary) | UBS Multi-Asset Income Fund | Class C
Risk Return [Abstract]	rr_RiskReturnAbstract
Trading Symbol	dei_TradingSymbol	MAIDX
UBS Multi-Asset Income Fund (Prospectus Summary) | UBS Multi-Asset Income Fund | Class Y
Risk Return [Abstract]	rr_RiskReturnAbstract
Trading Symbol	dei_TradingSymbol	MAIYX
UBS Equity Long-Short Multi-Strategy Fund (Prospectus Summary) | UBS Equity Long-Short Multi-Strategy Fund | Class A
Risk Return [Abstract]	rr_RiskReturnAbstract
Trading Symbol	dei_TradingSymbol	BMNAX
UBS Equity Long-Short Multi-Strategy Fund (Prospectus Summary) | UBS Equity Long-Short Multi-Strategy Fund | Class C
Risk Return [Abstract]	rr_RiskReturnAbstract
Trading Symbol	dei_TradingSymbol	BMNCX
UBS Equity Long-Short Multi-Strategy Fund (Prospectus Summary) | UBS Equity Long-Short Multi-Strategy Fund | Class Y
Risk Return [Abstract]	rr_RiskReturnAbstract
Trading Symbol	dei_TradingSymbol	BMNYX
UBS International Equity Fund (Prospectus Summary) | UBS International Equity Fund | Class A
Risk Return [Abstract]	rr_RiskReturnAbstract
Trading Symbol	dei_TradingSymbol	BNIEX
UBS International Equity Fund (Prospectus Summary) | UBS International Equity Fund | Class C
Risk Return [Abstract]	rr_RiskReturnAbstract
Trading Symbol	dei_TradingSymbol	BNICX
UBS International Equity Fund (Prospectus Summary) | UBS International Equity Fund | Class Y
Risk Return [Abstract]	rr_RiskReturnAbstract
Trading Symbol	dei_TradingSymbol	BNUEX
UBS U.S. Equity Opportunity Fund (Prospectus Summary) | UBS U.S. Equity Opportunity Fund | Class A
Risk Return [Abstract]	rr_RiskReturnAbstract
Trading Symbol	dei_TradingSymbol	BNVAX
UBS U.S. Equity Opportunity Fund (Prospectus Summary) | UBS U.S. Equity Opportunity Fund | Class C
Risk Return [Abstract]	rr_RiskReturnAbstract
Trading Symbol	dei_TradingSymbol	BNVCX
UBS U.S. Equity Opportunity Fund (Prospectus Summary) | UBS U.S. Equity Opportunity Fund | Class Y
Risk Return [Abstract]	rr_RiskReturnAbstract
Trading Symbol	dei_TradingSymbol	BUSVX
UBS U.S. Large Cap Equity Fund (Prospectus Summary) | UBS U.S. Large Cap Equity Fund | Class A
Risk Return [Abstract]	rr_RiskReturnAbstract
Trading Symbol	dei_TradingSymbol	BNEQX
UBS U.S. Large Cap Equity Fund (Prospectus Summary) | UBS U.S. Large Cap Equity Fund | Class C
Risk Return [Abstract]	rr_RiskReturnAbstract
Trading Symbol	dei_TradingSymbol	BNQCX
UBS U.S. Large Cap Equity Fund (Prospectus Summary) | UBS U.S. Large Cap Equity Fund | Class Y
Risk Return [Abstract]	rr_RiskReturnAbstract
Trading Symbol	dei_TradingSymbol	BPEQX
UBS U.S. Small Cap Growth Fund (Prospectus Summary) | UBS U.S. Small Cap Growth Fund | Class A
Risk Return [Abstract]	rr_RiskReturnAbstract
Trading Symbol	dei_TradingSymbol	BNSCX
UBS U.S. Small Cap Growth Fund (Prospectus Summary) | UBS U.S. Small Cap Growth Fund | Class C
Risk Return [Abstract]	rr_RiskReturnAbstract
Trading Symbol	dei_TradingSymbol	BNMCX
UBS U.S. Small Cap Growth Fund (Prospectus Summary) | UBS U.S. Small Cap Growth Fund | Class Y
Risk Return [Abstract]	rr_RiskReturnAbstract
Trading Symbol	dei_TradingSymbol	BISCX
UBS Core Plus Bond Fund (Prospectus Summary) | UBS Core Plus Bond Fund | Class A
Risk Return [Abstract]	rr_RiskReturnAbstract
Trading Symbol	dei_TradingSymbol	BNBDX
UBS Core Plus Bond Fund (Prospectus Summary) | UBS Core Plus Bond Fund | Class C
Risk Return [Abstract]	rr_RiskReturnAbstract
Trading Symbol	dei_TradingSymbol	BNOCX
UBS Core Plus Bond Fund (Prospectus Summary) | UBS Core Plus Bond Fund | Class Y
Risk Return [Abstract]	rr_RiskReturnAbstract
Trading Symbol	dei_TradingSymbol	BPBDX
UBS Fixed Income Opportunities Fund (Prospectus Summary) | UBS Fixed Income Opportunities Fund | Class A
Risk Return [Abstract]	rr_RiskReturnAbstract
Trading Symbol	dei_TradingSymbol	FNOAX
UBS Fixed Income Opportunities Fund (Prospectus Summary) | UBS Fixed Income Opportunities Fund | Class C
Risk Return [Abstract]	rr_RiskReturnAbstract
Trading Symbol	dei_TradingSymbol	FNOCX
UBS Fixed Income Opportunities Fund (Prospectus Summary) | UBS Fixed Income Opportunities Fund | Class Y
Risk Return [Abstract]	rr_RiskReturnAbstract
Trading Symbol	dei_TradingSymbol	FNOYX
UBS Global Bond Fund (Prospectus Summary) | UBS Global Bond Fund | Class A
Risk Return [Abstract]	rr_RiskReturnAbstract
Trading Symbol	dei_TradingSymbol	BNGBX
UBS Global Bond Fund (Prospectus Summary) | UBS Global Bond Fund | Class C
Risk Return [Abstract]	rr_RiskReturnAbstract
Trading Symbol	dei_TradingSymbol	BNDCX
UBS Global Bond Fund (Prospectus Summary) | UBS Global Bond Fund | Class Y
Risk Return [Abstract]	rr_RiskReturnAbstract
Trading Symbol	dei_TradingSymbol	BPGBX
UBS U.S. Equity Alpha Fund (Prospectus Summary) | UBS U.S. Equity Alpha Fund | Class A
Risk Return [Abstract]	rr_RiskReturnAbstract
Trading Symbol	dei_TradingSymbol	BEAAX
UBS U.S. Equity Alpha Fund (Prospectus Summary) | UBS U.S. Equity Alpha Fund | Class C
Risk Return [Abstract]	rr_RiskReturnAbstract
Trading Symbol	dei_TradingSymbol	BEACX
UBS U.S. Equity Alpha Fund (Prospectus Summary) | UBS U.S. Equity Alpha Fund | Class Y
Risk Return [Abstract]	rr_RiskReturnAbstract
Trading Symbol	dei_TradingSymbol	BEAYX
UBS Global Equity Fund (Prospectus Summary) | UBS Global Equity Fund | Class A
Risk Return [Abstract]	rr_RiskReturnAbstract
Trading Symbol	dei_TradingSymbol	BNGEX
UBS Global Equity Fund (Prospectus Summary) | UBS Global Equity Fund | Class C
Risk Return [Abstract]	rr_RiskReturnAbstract
Trading Symbol	dei_TradingSymbol	BNECX
UBS Global Equity Fund (Prospectus Summary) | UBS Global Equity Fund | Class Y
Risk Return [Abstract]	rr_RiskReturnAbstract
Trading Symbol	dei_TradingSymbol	BPGEX
UBS High Yield Fund (Prospectus Summary) | UBS High Yield Fund | Class A
Risk Return [Abstract]	rr_RiskReturnAbstract
Trading Symbol	dei_TradingSymbol	BNHYX
UBS High Yield Fund (Prospectus Summary) | UBS High Yield Fund | Class C
Risk Return [Abstract]	rr_RiskReturnAbstract
Trading Symbol	dei_TradingSymbol	BNHCX
UBS High Yield Fund (Prospectus Summary) | UBS High Yield Fund | Class Y
Risk Return [Abstract]	rr_RiskReturnAbstract
Trading Symbol	dei_TradingSymbol	BIHYX

XML

Label	Element	Value
Risk Return [Abstract]	rr_RiskReturnAbstract
ProspectusDate	rr_ProspectusDate	Oct. 29, 2012
UBS High Yield Fund (Prospectus Summary) | UBS High Yield Fund
Risk Return [Abstract]	rr_RiskReturnAbstract
Risk/Return [Heading]	rr_RiskReturnHeading	UBS High Yield Fund
Objective [Heading]	rr_ObjectiveHeading	Investment objective
Objective, Primary [Text Block]	rr_ObjectivePrimaryTextBlock	The Fund seeks to provide high current income, as well as capital growth when consistent with high 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 $100,000 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 17 of the Fund's prospectus and in "Reduced sales charges, additional purchase, exchange and redemption information and other services" on page 74 of the Fund's statement of additional information ("SAI").
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)
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 50% of the average value of its portfolio.
Portfolio Turnover, Rate	rr_PortfolioTurnoverRate	50.00%
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 $100,000 in the Fund.
Expense Breakpoint, Minimum Investment Required [Amount]	rr_ExpenseBreakpointMinimumInvestmentRequiredAmount	100,000
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 The Fund invests in a portfolio of higher yielding, lower-rated debt securities issued by foreign and domestic companies. Under normal conditions, at least 80% of the Fund's net assets (plus borrowings for investment purposes, if any) are invested in fixed income securities that provide higher yields and are lower-rated. The Fund may invest in fixed income securities of any maturity, but generally invests in securities having an initial maturity of more than one year. Investments in fixed income securities may include, but are not limited to, mortgage-backed and asset-backed securities. Up to 25% of the Fund's total assets may be invested in foreign securities, which may include securities of issuers in emerging markets. 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 options, futures, forward agreements, swap agreements (specifically, interest rate, total return, currency and credit default swaps), credit-linked securities and structured investments. All of these derivatives may be used for risk management purposes, such as hedging against a specific security or currency, or to manage or adjust the risk profile of the Fund. In addition, all of the derivative instruments listed above may be used for investment (non-hedging) purposes to earn income; to enhance returns; to replace more traditional direct investments; to obtain exposure to certain markets; to establish net short positions for individual sectors, markets, currencies or securities; or to adjust the Fund's portfolio duration. Lower-rated bonds are bonds rated in the lower rating categories of Moody's Investors Service, Inc. ("Moody's") and Standard & Poor's Ratings Group ("S&P"), including securities rated Ba or lower by Moody's or BB or lower by S&P. Securities rated in these categories are considered to be of poorer quality and predominantly speculative. Bonds in these categories may also be called "high yield bonds" or "junk bonds." Management process The Fund invests in securities that the Advisor expects will appreciate in value as a result of declines in long-term interest rates or favorable developments affecting the business or prospects of the issuer which may improve the issuer's financial condition and credit rating. In selecting securities, the Advisor uses a quantitative and qualitative credit review process that assesses the ways in which macroeconomic forces (such as inflation, risk premiums and interest rates), as well as certain quantitative factors, such as historical operating results, calculation of credit ratios and expected future outlook, may affect industry trends. Against the output of this model, the Advisor considers the viability of specific debt securities, assessing management strength, market position, competitive environment and financial flexibility. The Advisor determines optimal sector, security and credit rating weightings based on its assessment of macro and microeconomic factors. Depending on market conditions, undervalued securities may be found in different sectors. Therefore, all investment decisions are interrelated and made using ongoing sector, security and rating evaluation.
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. Interest rate risk: An increase in prevailing interest rates typically causes the value of fixed income securities to fall. Changes in interest rates will likely affect the value of longer-duration fixed income securities more than shorter-duration securities and higher quality securities more than lower quality securities. When interest rates are falling, some fixed income securities provide that the issuer may repay them earlier than the maturity date, and if this occurs the Fund may have to reinvest these repayments at lower interest rates. Credit risk: The risk that the Fund could lose money if the issuer or guarantor of a fixed income security, or the counterparty to or guarantor of a derivative contract, is unable or unwilling to meet its financial obligations. This risk is likely greater for lower quality investments than for investments that are higher quality. High yield bond risk: The risk that the issuer of bonds with ratings of BB (S&P) or Ba (Moody's) or below, or deemed of equivalent quality, will default or otherwise be unable to honor a financial obligation (also known as lower-rated or "junk bonds"). These securities are considered to be predominately speculative with respect to an issuer's capacity to pay interest and repay principal in accordance with the terms of the obligations. Lower-quality bonds are more likely to be subject to an issuer's default or downgrade than investment grade (higher-quality) bonds. Market risk: The risk that 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. 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. Investments in foreign government bonds involve special risks because the Fund may have limited legal recourse in the event of default. Also, foreign securities are sometimes less liquid and more difficult to sell and to value than securities of US issuers. These risks are greater for investments in emerging market issuers. In addition, investments in emerging market issuers may decline in value because of unfavorable foreign government actions, greater risks of political instability or the absence of accurate information about emerging market issuers. 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. Derivatives relating to fixed income markets are especially susceptible to interest rate risk and credit risk. In addition, many types of swaps and other 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. Management risk: The risk that the investment strategies, techniques and risk analyses employed by the Advisor may not produce the desired results.
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. 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 Returns [Text]	rr_PerformanceInformationIllustratesVariabilityOfReturns	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.
Performance Availability Website Address [Text]	rr_PerformanceAvailabilityWebSiteAddress	http://globalam-us.ubs.com/corpweb/performance.do
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	UBS High Yield Fund Annual Total Returns of Class Y Shares
Bar Chart Closing [Text Block]	rr_BarChartClosingTextBlock	Total return January 1 - September 30, 2012: 11.60% Best quarter during calendar years shown-2Q 2009: 19.58% Worst quarter during calendar years shown-4Q 2008: (16.49)%
Index No Deduction for Fees, Expenses, Taxes [Text]	rr_IndexNoDeductionForFeesExpensesTaxes	Index 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	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 Y shares' after-tax returns shown.
Caption	rr_AverageAnnualReturnCaption	Average annual total returns (for the periods ended December 31, 2011)
UBS High Yield Fund (Prospectus Summary) | UBS High Yield Fund | BofA Merrill Lynch US High Yield Cash Pay Constrained Index
Risk Return [Abstract]	rr_RiskReturnAbstract
Label	rr_AverageAnnualReturnLabel	BofA Merrill Lynch US High Yield Cash Pay Constrained Index
1 Year	rr_AverageAnnualReturnYear01	4.49%
5 Years	rr_AverageAnnualReturnYear05	7.43%
10 Years	rr_AverageAnnualReturnYear10	8.66%
UBS High Yield Fund (Prospectus Summary) | UBS High Yield Fund | Class A
Risk Return [Abstract]	rr_RiskReturnAbstract
Maximum front-end sales charge (load) imposed on purchases (as a % of offering price)	rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice	4.50%
Maximum contingent deferred sales charge (load) (CDSC) (as a % of purchase or sales price, whichever is less)	rr_MaximumDeferredSalesChargeOverOfferingPrice	none	[1]
Redemption fee (as a % of amount redeemed within 90 days of purchase, if applicable)	rr_RedemptionFeeOverRedemption	(1.00%)	[1]
Management fees	rr_ManagementFeesOverAssets	0.60%
Distribution and/or service (12b-1) fees	rr_DistributionAndService12b1FeesOverAssets	0.25%	[1]
Other expenses	rr_OtherExpensesOverAssets	0.48%	[2]
Total annual fund operating expenses	rr_ExpensesOverAssets	1.33%
Less management fee waiver/expense reimbursements	rr_FeeWaiverOrReimbursementOverAssets	(0.13%)
Total annual fund operating expenses after management fee waiver/expense reimbursements	rr_NetExpensesOverAssets	1.20%	[3]
Fee Waiver or Reimbursement over Assets, Date of Termination	rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination	2013-10-28
Expense Example, with Redemption, 1 Year	rr_ExpenseExampleYear01	567
Expense Example, with Redemption, 3 Years	rr_ExpenseExampleYear03	840
Expense Example, with Redemption, 5 Years	rr_ExpenseExampleYear05	1,134
Expense Example, with Redemption, 10 Years	rr_ExpenseExampleYear10	1,969
Label	rr_AverageAnnualReturnLabel	Class A Return before taxes
1 Year	rr_AverageAnnualReturnYear01	(2.16%)
5 Years	rr_AverageAnnualReturnYear05	4.35%
10 Years	rr_AverageAnnualReturnYear10	6.50%
Inception Date	rr_AverageAnnualReturnInceptionDate	Dec. 31, 1998
UBS High Yield Fund (Prospectus Summary) | UBS High Yield Fund | Class C
Risk Return [Abstract]	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	0.75%	[1]
Redemption fee (as a % of amount redeemed within 90 days of purchase, if applicable)	rr_RedemptionFeeOverRedemption	(1.00%)	[1]
Management fees	rr_ManagementFeesOverAssets	0.60%
Distribution and/or service (12b-1) fees	rr_DistributionAndService12b1FeesOverAssets	0.75%	[1]
Other expenses	rr_OtherExpensesOverAssets	0.48%	[2]
Total annual fund operating expenses	rr_ExpensesOverAssets	1.83%
Less management fee waiver/expense reimbursements	rr_FeeWaiverOrReimbursementOverAssets	(0.13%)
Total annual fund operating expenses after management fee waiver/expense reimbursements	rr_NetExpensesOverAssets	1.70%	[1],[3]
Fee Waiver or Reimbursement over Assets, Date of Termination	rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination	2013-10-28
Expense Example, with Redemption, 1 Year	rr_ExpenseExampleYear01	248
Expense Example, with Redemption, 3 Years	rr_ExpenseExampleYear03	563
Expense Example, with Redemption, 5 Years	rr_ExpenseExampleYear05	978
Expense Example, with Redemption, 10 Years	rr_ExpenseExampleYear10	2,137
Expense Example, No Redemption, 1 Year	rr_ExpenseExampleNoRedemptionYear01	173
Expense Example, No Redemption, 3 Years	rr_ExpenseExampleNoRedemptionYear03	563
Expense Example, No Redemption, 5 Years	rr_ExpenseExampleNoRedemptionYear05	978
Expense Example, No Redemption, 10 Years	rr_ExpenseExampleNoRedemptionYear10	2,137
Label	rr_AverageAnnualReturnLabel	Class C Return before taxes	[4]
1 Year	rr_AverageAnnualReturnYear01	1.19%
5 Years	rr_AverageAnnualReturnYear05	4.81%
10 Years	rr_AverageAnnualReturnYear10	6.46%
Inception Date	rr_AverageAnnualReturnInceptionDate	Nov. 07, 2001
UBS High Yield Fund (Prospectus Summary) | UBS High Yield Fund | Class Y
Risk Return [Abstract]	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	[1]
Redemption fee (as a % of amount redeemed within 90 days of purchase, if applicable)	rr_RedemptionFeeOverRedemption	(1.00%)	[1]
Management fees	rr_ManagementFeesOverAssets	0.60%
Distribution and/or service (12b-1) fees	rr_DistributionAndService12b1FeesOverAssets	none
Other expenses	rr_OtherExpensesOverAssets	0.41%	[2]
Total annual fund operating expenses	rr_ExpensesOverAssets	1.01%
Less management fee waiver/expense reimbursements	rr_FeeWaiverOrReimbursementOverAssets	(0.06%)
Total annual fund operating expenses after management fee waiver/expense reimbursements	rr_NetExpensesOverAssets	0.95%	[3]
Fee Waiver or Reimbursement over Assets, Date of Termination	rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination	2013-10-28
Expense Example, with Redemption, 1 Year	rr_ExpenseExampleYear01	97
Expense Example, with Redemption, 3 Years	rr_ExpenseExampleYear03	316
Expense Example, with Redemption, 5 Years	rr_ExpenseExampleYear05	552
Expense Example, with Redemption, 10 Years	rr_ExpenseExampleYear10	1,231
Annual Return 2002	rr_AnnualReturn2002	(0.78%)
Annual Return 2003	rr_AnnualReturn2003	23.16%
Annual Return 2004	rr_AnnualReturn2004	13.35%
Annual Return 2005	rr_AnnualReturn2005	0.68%
Annual Return 2006	rr_AnnualReturn2006	10.25%
Annual Return 2007	rr_AnnualReturn2007	0.83%
Annual Return 2008	rr_AnnualReturn2008	(23.23%)
Annual Return 2009	rr_AnnualReturn2009	44.50%
Annual Return 2010	rr_AnnualReturn2010	14.41%
Annual Return 2011	rr_AnnualReturn2011	2.48%
Year to Date Return, Label	rr_YearToDateReturnLabel	Total return January 1 - September 30, 2012:
Bar Chart, Year to Date Return, Date	rr_BarChartYearToDateReturnDate	Sep. 30, 2012
Bar Chart, Year to Date Return	rr_BarChartYearToDateReturn	11.60%
Highest Quarterly Return, Label	rr_HighestQuarterlyReturnLabel	Best quarter during calendar years shown-2Q 2009:
Highest Quarterly Return, Date	rr_BarChartHighestQuarterlyReturnDate	Jun. 30, 2009
Highest Quarterly Return	rr_BarChartHighestQuarterlyReturn	19.58%
Lowest Quarterly Return, Label	rr_LowestQuarterlyReturnLabel	Worst quarter during calendar years shown-4Q 2008:
Lowest Quarterly Return, Date	rr_BarChartLowestQuarterlyReturnDate	Dec. 31, 2008
Lowest Quarterly Return	rr_BarChartLowestQuarterlyReturn	(16.49%)
Label	rr_AverageAnnualReturnLabel	Class Y Return before taxes
1 Year	rr_AverageAnnualReturnYear01	2.48%
5 Years	rr_AverageAnnualReturnYear05	5.57%
10 Years	rr_AverageAnnualReturnYear10	7.26%
Inception Date	rr_AverageAnnualReturnInceptionDate	Sep. 30, 1997
UBS High Yield Fund (Prospectus Summary) | UBS High Yield Fund | Class Y | After Taxes on Distributions
Risk Return [Abstract]	rr_RiskReturnAbstract
Label	rr_AverageAnnualReturnLabel	Class Y Return after taxes on distributions
1 Year	rr_AverageAnnualReturnYear01	(0.24%)
5 Years	rr_AverageAnnualReturnYear05	2.35%
10 Years	rr_AverageAnnualReturnYear10	3.98%
Inception Date	rr_AverageAnnualReturnInceptionDate	Sep. 30, 1997
UBS High Yield Fund (Prospectus Summary) | UBS High Yield Fund | Class Y | After Taxes on Distributions and Sales
Risk Return [Abstract]	rr_RiskReturnAbstract
Label	rr_AverageAnnualReturnLabel	Class Y Return after taxes on distributions and sale of fund shares
1 Year	rr_AverageAnnualReturnYear01	1.61%
5 Years	rr_AverageAnnualReturnYear05	2.78%
10 Years	rr_AverageAnnualReturnYear10	4.20%
Inception Date	rr_AverageAnnualReturnInceptionDate	Sep. 30, 1997

[1] In connection with the proposed Reorganization of the Fund into the Nationwide High Yield Bond Fund series of Nationwide Mutual Funds, effective as of the close of business on July 16, 2012, the Fund's Board of Trustees approved the waiver of the annual Rule 12b-1 distribution fee of 0.50% of average net assets that is charged to the shareholders of Class C shares of the Fund. In addition, the Fund has voluntarily lowered the expense limit applicable to Class C shares to 1.20% to reflect the waiver of this Rule 12b-1 distribution fee. The annual service fee of 0.25% of average net assets that is charged on Class A and Class C shares of the Fund was not eliminated. The Board of Trustees also approved the waiver of the 1.00% redemption fee that is charged on sales or exchanges of any Class of shares of the Fund less than 90 days after purchase and the elimination of all contingent deferred sales charges (CDSC) assessed on redemptions that are charged on Class A shares (on purchases above $1 million) and Class C shares. With respect to exchanges of shares of the Fund for shares of another UBS Family Fund, the length of time you held your shares of the UBS Fund will still be considered when determining whether you must pay a CDSC when you sell the shares of the UBS Family Fund acquired in the exchange. These changes are not reflected in the fee and expense tables above or the expense example below.

[2] "Other expenses" include "Acquired fund fees and expenses," which were less than 0.01% of the average net assets of the Fund.

[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, and 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, and dividend expense and security loan fees for securities sold short), through the period ending October 28, 2013, do not exceed 1.20% for Class A shares, 1.70% for Class C shares and 0.95% 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. 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, the UBS Global AM (Americas)'s three year recoupment rights will survive.

[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.

XML

UBS Global Frontier Fund (Prospectus Summary) | UBS Global Frontier Fund

UBS Global Frontier Fund

Investment objective

The Fund seeks to obtain superior long-term returns on capital.

Fees and expenses

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 43 of the Fund's
prospectus and in "Reduced sales charges, additional purchase, exchange and
redemption information and other services" on page 107 of the Fund's statement
of additional information ("SAI").

Shareholder fees (fees paid directly from your investment)

Shareholder Fees UBS Global Frontier Fund	Class A		Class C	Class Y
Maximum front-end sales charge (load) imposed on purchases (as a % of offering price)	5.50%		none	none
Maximum contingent deferred sales charge (load) (CDSC) (as a % of purchase or sales price, whichever is less)	none	[1]	1.00%	none
Redemption fee (as a % of amount redeemed within 90 days of purchase, if applicable)	1.00%		1.00%	1.00%

Annual fund operating expenses (expenses that you pay each year as a percentage of the value of your investment)

Annual Fund Operating Expenses UBS Global Frontier Fund		Class A	Class C	Class Y
Management fees		0.95%	0.95%	0.95%
Distribution and/or service (12b-1) fees		0.25%	1.00%	none
Other expenses		0.53%	0.56%	0.56%
Acquired fund fees and expenses		0.12%	0.12%	0.12%
Total annual fund operating expenses	[1]	1.85%	2.63%	1.63%
Less management fee waiver/expense reimbursements		0.33%	0.36%	0.36%
Total annual fund operating expenses after management fee waiver/expense reimbursements	[1][2]	1.52%	2.27%	1.27%

Example

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:

Expense Example UBS Global Frontier Fund (USD $)	Expense Example, with Redemption, 1 Year	Expense Example, with Redemption, 3 Years	Expense Example, with Redemption, 5 Years	Expense Example, with Redemption, 10 Years
Class A	696	1,069	1,467	2,574
Class C	330	783	1,363	2,937
Class Y	129	479	853	1,903

Expense Example, No Redemption (USD $)	Expense Example, No Redemption, 1 Year	Expense Example, No Redemption, 3 Years	Expense Example, No Redemption, 5 Years	Expense Example, No Redemption, 10 Years
UBS Global Frontier Fund Class C	230	783	1,363	2,937

Portfolio turnover

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 109%
of the average value of its portfolio.

Principal strategies

Principal investments

In order to achieve the Fund's investment objective, the Advisor employs an
enhancement to its global securities (allocation) strategy ("Global Securities
(Allocation) Strategy"). The Advisor's Global Securities (Allocation) Strategy
seeks to provide exposure to the major asset classes of the global markets and
is currently utilized by other funds and products managed by the Advisor,
including the UBS Global Allocation Fund, a series of the Trust, and the UBS
Global Securities Relationship Fund, a series of UBS Relationship Funds (the
"GSR Fund"). The Advisor enhances its Global Securities (Allocation) Strategy
with respect to the Fund by increasing the Fund's exposure to the global markets
through the use of leverage to achieve higher returns than the Global Securities
(Allocation) Strategy typically with equity-like risk. However, when warranted
by market conditions, the Advisor attempts to limit the Fund's equity risk
through active asset allocation.

The Fund principally invests directly or indirectly in equity and fixed income
securities and other financial instruments to gain exposure to issuers located
within and outside the United States. In connection with its Global Securities
(Allocation) Strategy, under normal circumstances, the Advisor allocates the
exposure of the Fund's assets between fixed income securities and equity
securities, including securities of issuers in both developed (including the
United States) and emerging markets countries. The Fund may invest directly
in such securities and financial instruments and/or indirectly in such
investments by investing in shares of open-end investment companies ("Underlying
Funds"), including open-end investment companies advised by the Advisor. In
addition, the Fund increases its exposure to the global markets through the use
of leverage. Leverage by the Fund generally is achieved by entering into total
return swap agreements with respect to the return of the GSR Fund.
Alternatively, the Fund may achieve leverage by engaging in futures contracts
with respect to securities or indices.

Investments by the Fund or an Underlying Fund in fixed income securities may
include, but are not limited to, debt securities of governments throughout the
world (including the United States), their agencies and instrumentalities, debt
securities of corporations, mortgage-backed securities and asset-backed
securities. These securities will have an initial maturity of more than one year
and may be either investment grade or high yield (lower-rated or "junk bonds")
securities. Investments by the Fund or an Underlying Fund in equity securities
may include, but are not limited to, common stock and preferred stock. The Fund
may invest in equity securities of issuers in any capitalization range based on
market conditions and in accordance with its investment objective.

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, forward agreements, swap agreements (specifically, total return and
inflation swaps), equity participation notes and equity linked notes. All of
these derivatives may be used for risk management purposes, such as hedging
against a specific security or currency (except with respect to equity
participation notes and equity linked notes), or to manage or adjust the risk
profile of the Fund. In addition, all of the derivative instruments listed above
may be used for investment (non-hedging) purposes to earn income; to enhance
returns; to replace more traditional direct investments; to obtain exposure to
certain markets; or to establish net short positions for individual markets,
currencies or securities. Futures on indices and forward agreements may also be
used to adjust the Fund's portfolio duration.

In particular, the Fund may seek to increase its exposure to the global markets
through the use of leverage by investing in total return swap agreements with
respect to the return of the GSR Fund. As an alternative to investing in total
return swap agreements based on the return of the GSR Fund, the Fund may also
leverage by borrowing from banks to the extent permitted by the Investment Company
Act of 1940, as amended (the "1940 Act"), to invest additional assets in the global
markets by investing the borrowed assets in the GSR Fund. The use of leverage by
the Fund through total return swaps, futures contracts or borrowing is permitted
to range between 0% to 50% of the Fund's total assets (including amounts
borrowed), but typically ranges between 25% to 40% of the Fund's total assets
(including amounts borrowed).

Management process

The Fund is a multi-asset fund managed in accordance with the Advisor's Global
Securities (Allocation) Strategy. Asset allocation decisions are tactical, based
upon the Advisor's assessment of valuations and prevailing market conditions in
the United States and abroad. In determining the asset allocation of the Fund,
the Advisor may utilize fundamental valuation and market behavior indicators to
construct the Fund's portfolio.

With respect to the Advisor's selection of specific equity securities for
inclusion in the Fund's or an Underlying Fund's equity asset classes, the
Advisor may utilize fundamental valuation and growth-oriented strategies.

In selecting equity securities for the Fund or an Underlying Fund using the
fundamental valuation process, the Advisor selects securities whose fundamental
values (the Advisor's assessment of what a security is worth) it believes are
greater than what is reflected in market prices. A stock with a market price
below its assessed fundamental value would be considered for inclusion in the
Fund's or an Underlying Fund's portfolio.

Under certain circumstances the Advisor also may utilize a growth-oriented
strategy within its equity asset classes. In selecting growth equities, the
Advisor seeks to invest in companies that possess a dominant market position and
franchise, a major technological edge or a unique competitive advantage.

The Advisor's fixed income strategy combines judgments about the absolute value
of the fixed income universe and the relative value of issuer sectors, maturity
intervals, security durations, credit qualities and coupon segments, as well as
specific circumstances facing the issuers of fixed income securities.

The Fund's and the Underlying Funds' risks are carefully monitored with
consideration given to the risk generated by individual position, sector,
country and currency views.

The Advisor enhances its Global Securities (Allocation) Strategy with respect to
the Fund by increasing the Fund's exposure to the global markets through the use
of leverage. The Advisor's employment of leverage mechanisms with respect to the
Fund's portfolio is based on the belief that, in conventional portfolio
management, increasing a portfolio's long-term expected return entails adding
riskier equity-like assets and reducing the allocation to lower-risk fixed
income investments. The Advisor seeks to step beyond this framework to provide
higher risk-adjusted returns than the Global Securities (Allocation) Strategy by
employing leverage through investing in total return swaps based on the return
of the GSR Fund, engaging in futures contracts with respect to securities or
indices, or borrowing from banks to the extent permitted by the 1940 Act to
purchase additional shares of the GSR Fund to increase the Fund's risk and
return in an efficient manner.

Main risks

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.

Investing in other funds risks: The Fund's investment performance is affected by
the investment performance of the Underlying Funds in which the Fund may invest.
Through its investment in the Underlying Funds, the Fund is subject to the risks
of the Underlying Funds' investments and subject to the Underlying Funds'
expenses.

Market risk: The risk that 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.

Interest rate risk: An increase in prevailing interest rates typically causes
the value of fixed income securities to fall. Changes in interest rates will
likely affect the value of longer-duration fixed income securities more than
shorter-duration securities and higher quality securities more than lower
quality securities. When interest rates are falling, some fixed income
securities provide that the issuer may repay them earlier than the maturity
date, and if this occurs the Fund may have to reinvest these repayments at
lower interest rates.

Government securities risk: There are different types of US government
securities with different levels of credit risk, including 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.

Credit risk: The risk that the Fund could lose money if the issuer or guarantor
of a fixed income security, or the counterparty to or guarantor of a derivative
contract, is unable or unwilling to meet its financial obligations. This risk is
likely greater for lower quality investments than for investments that are
higher quality.

High yield bond risk: The risk that the issuer of bonds with ratings of BB
(Standard & Poor's Ratings Group ("S&P")) or Ba (Moody's Investors Service, Inc.
("Moody's")) or below, or deemed of equivalent quality, will default or
otherwise be unable to honor a financial obligation (also known as lower-rated
or "junk bonds"). These securities are considered to be predominately
speculative with respect to an issuer's capacity to pay interest and repay
principal in accordance with the terms of the obligations. Lower-quality bonds
are more likely to be subject to an issuer's default or downgrade than
investment grade (higher-quality) bonds.

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.

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. Investments in foreign government bonds involve special risks because
the Fund may have limited legal recourse in the event of default. Also, foreign
securities are sometimes less liquid and more difficult to sell and to value
than securities of US issuers. These risks are greater for investments in
emerging market issuers. In addition, investments in emerging market issuers may
decline in value because of unfavorable foreign government actions, greater
risks of political instability or the absence of accurate information about
emerging market issuers.

Asset allocation risk: The risk that the Fund may allocate assets to an asset
category that performs poorly relative to other asset categories.

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. Derivatives relating to fixed income
markets are especially susceptible to interest rate risk and credit risk. In
addition, many types of swaps and other 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.

Leverage risk associated with borrowing: The Fund may borrow money from banks to
purchase investments for the Fund, which is a form of leverage. If the Fund
borrows money to purchase securities and the Fund's investments decrease in
value, the Fund's losses will be greater than if the Fund did not borrow money
for investment purposes. In addition, if the return on an investment purchased
with borrowed funds is not sufficient to cover the cost of borrowing, then the
net income of the Fund would be less than if borrowing were not used.

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

Performance

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. The GSMI Mutual Fund Index shows how the Fund's performance
compares to an index compiled by the Advisor that is constructed as follows: 65%
MSCI All Country World Index (net), 15% Citigroup World Government Bond ex US
Index, 15% Citigroup US Government Bond Index, 2% J.P. Morgan Emerging Markets Bond
Index Global (EMBI Global) and 3% BofA Merrill Lynch US High Yield Cash Pay
Constrained Index. Life of class performance for the MSCI World Free Index (net)
and the GSMI Mutual Fund Index is as of the inception month end. Indices reflect no
deduction for fees, expenses or taxes, except for the MSCI World Free Index (net)
which reflects no deduction for fees and expenses. 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.

UBS Global Frontier Fund Annual Total Returns of Class Y Shares (2008 is the Fund's first full year of operations)

Total return January 1 - September 30, 2012: 12.67%
Best quarter during calendar years shown-2Q 2009: 33.02%
Worst quarter during calendar years shown-4Q 2008: (29.77)%

Average annual total returns (for the periods ended December 31, 2011)

Average Annual Total Returns UBS Global Frontier Fund	Label	1 Year	Since Inception	Inception Date
Class A	Class A Return before taxes	(15.26%)	(6.27%)	Jul. 26, 2007
Class C	Class C Return before taxes	(11.87%)	(5.76%)	Jul. 26, 2007
Class Y	Class Y Return before taxes	(10.17%)	(4.82%)	Jul. 26, 2007
Class Y After Taxes on Distributions	Class Y Return after taxes on distributions	(11.69%)	(5.82%)	Jul. 26, 2007
Class Y After Taxes on Distributions and Sales	Class Y Return after taxes on distributions and sale of fund shares	(6.37%)	(4.48%)	Jul. 26, 2007
GSMI Mutual Fund Index	GSMI Mutual Fund Index	(2.14%)	0.67%
MSCI World Free ex USA Index (net)	MSCI World Free Index (net)	(5.54%)	(4.10%)

[1] 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.

[1] 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.

[2] 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, and 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, and dividend expense and security loan fees for securities sold short), through the period ending October 28, 2013, do not exceed 1.40% for Class A 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. 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, the UBS Global AM (Americas)'s three year recoupment rights will survive.

XML

UBS Emerging Markets Debt Fund (Prospectus Summary) | UBS Emerging Markets Debt Fund

UBS Emerging Markets Debt Fund

Investment objective

The Fund seeks to maximize total return, consisting of capital appreciation and
current income.

Fees and expenses

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 34 of the Fund's
prospectus and in "Reduced sales charges, additional purchase, exchange and
redemption information and other services" on page 107 of the Fund's statement
of additional information ("SAI").

Shareholder fees (fees paid directly from your investment)

Shareholder Fees UBS Emerging Markets Debt Fund	Class A		Class C	Class Y
Maximum front-end sales charge (load) imposed on purchases (as a % of offering price)	4.50%		none	none
Maximum contingent deferred sales charge (load) (CDSC) (as a % of purchase or sales price, whichever is less)	none	[1]	0.75%	none
Redemption fee (as a percentage of amount redeemed within 90 days of purchase, if applicable)	1.00%		1.00%	1.00%

Annual fund operating expenses (expenses that you pay each year as a percentage of the value of your investment)

Annual Fund Operating Expenses UBS Emerging Markets Debt Fund		Class A	Class C	Class Y
Management fees		0.75%	0.75%	0.75%
Distribution and/or service (12b-1) fees		0.25%	0.75%	none
Other expenses	[1]	0.84%	0.84%	0.84%
Total annual fund operating expenses		1.84%	2.34%	1.59%
Less management fee waiver/expense reimbursements		0.59%	0.59%	0.59%
Total annual fund operating expenses after management fee waiver/expense reimbursements	[2]	1.25%	1.75%	1.00%

Example

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:

Expense Example UBS Emerging Markets Debt Fund (USD $)	Expense Example, with Redemption, 1 Year	Expense Example, with Redemption, 3 Years
Class A	572	948
Class C	253	674
Class Y	102	444

Expense Example, No Redemption (USD $)	Expense Example, No Redemption, 1 Year	Expense Example, No Redemption, 3 Years
UBS Emerging Markets Debt Fund Class C	178	674

Portfolio turnover

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.

Principal strategies

Principal investments

Under normal circumstances, the Fund invests at least 80% of its net assets
(plus borrowings for investment purposes, if any) in debt securities and other
debt instruments that are tied economically to emerging market countries.

Such investments may include, but are not limited to, debt securities issued by
governments, government-related entities, corporations, supranational entities
and entities organized to restructure outstanding debt of issuers in emerging
markets, and instruments whose return is derived from any of the foregoing.

The Fund may invest in debt instruments of all types and denominated in any
currency. These may include, but are not limited to, bonds, debentures, notes,
convertible securities, loans and related assignments and participations,
when-issued and delayed-delivery securities, mortgage-backed and other types
of asset-backed securities issued on a public or private basis, and cash
equivalents.

The Fund is a non-diversified fund.

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
options (including, but not limited to, options on futures, forwards and swap
agreements), futures, forward agreements, swap agreements (specifically,
interest rate, total return, currency, credit default and inflation swaps),
credit-linked securities and structured investments. All of these derivatives
may be used for risk management purposes, such as hedging against a specific
security or currency, or to manage or adjust the risk profile of the Fund. In
addition, all of the derivative instruments listed above may be used for investment
(non-hedging) purposes to earn income; to enhance returns; to replace more traditional
direct investments; to obtain exposure to certain markets; to establish net short
positions for individual sectors, markets, currencies or securities; or to adjust the
Fund's portfolio duration.

The Fund intends to invest primarily in a portfolio of debt securities located
in at least three emerging market countries, which may be located in Asia,
Europe, Latin America, Africa or the Middle East. An emerging market country is
a country defined as an emerging or developing economy by any of the World Bank,
the International Finance Corporation or the United Nations or its authorities.
Additionally, the Fund, for purposes of its investments, may consider a country
included in JP Morgan or MSCI emerging markets indices to be an emerging market
country. The countries included in this definition will change over time.

A substantial amount of the Fund's assets may be invested in higher-yielding,
lower-rated bonds ("junk bonds"). Lower-rated bonds are bonds rated in the lower
rating categories of Moody's Investors Service, Inc. ("Moody's") and Standard &
Poor's Ratings Group ("S&P"), including securities rated Ba or lower by Moody's
and BB or lower by S&P.

Derivative instruments such as swaps, options, futures, credit linked or
structured investments or other debt instruments that are tied economically to
emerging market countries may be used to satisfy the Fund's 80% investment
policy.

Management process

The investment process is based on fundamental analysis, coupling a top-down
strategy with an equally important bottom-up security selection strategy. The
Advisor manages and monitors risk/return trade-offs in a disciplined manner
across country allocation, sector allocation, issue selection, duration/yield
curve positioning, and currency management. Proprietary valuation and risk
models enhance seasoned professional judgment.

The investment process is founded upon the Advisor's conviction that
discrepancies occur between market prices and fundamental values. In the case
of emerging markets debt, price volatility generally exceeds that of the underlying
macroeconomic fundamentals. The investment team takes advantage of these
discrepancies by applying a disciplined approach to measure fundamental value
from the perspective of a long-term investor.

The investment decision-making process can be divided up into three
parts-country, currency and security selection.

Country selection

The Advisor decides on country over- and under-weights relative to the Fund's
custom benchmark, the Emerging Markets Debt Benchmark Index, which is comprised
of 50% J.P. Morgan Emerging Markets Bond Index Global (EMBI Global) and 50% J.P.
Morgan Government Bond Index-Emerging Markets Global Diversified (GBI-EM Global
Diversified), by using a price/value framework. Subjective judgments, such as
political risk assessment, also affect the final country decision.

Currency selection

The Advisor searches for currencies that will outperform market expectations,
given the Advisor's currency and market views. The Advisor also seeks to
identify potential sales in the Fund's portfolio when risk is not being
compensated by expected return. Typically, the Fund obtains exposure to local
currencies via bonds denominated in local currency or derivative positions.

Security selection

The Advisor searches for bonds that will outperform market expectations, given
the Advisor's country and market views. The Advisor also seeks to identify
potential sales in the Fund's portfolio when risk is not being compensated by
expected return. Typically, the Fund invests in sovereign bonds, denominated in
US dollars as well as in local currencies. The Advisor also examines local
market bond and corporate bond opportunities.

The Advisor's analysis of emerging market bonds is enhanced by an advanced
in-house emerging market bond analytics database. The database is specially
designed to assimilate the characteristics of emerging market bonds; it allows
the Advisor to perform detailed instrument-level analysis.

In addition to macroeconomic research, bottom-up input-such as liquidity
considerations, volatility and company risk for specific bonds, to name a few,
is also crucial in the Advisor's decision making process.

Main risks

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.

Interest rate risk: An increase in prevailing interest rates typically causes
the value of fixed income securities to fall. Changes in interest rates will
likely affect the value of longer-duration fixed income securities more than
shorter-duration securities and higher quality securities more than lower
quality securities. When interest rates are falling, some fixed income
securities provide that the issuer may repay them earlier than the maturity
date, and if this occurs the Fund may have to reinvest these repayments at lower
interest 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 and due to decreases in foreign currency values relative to the US
dollar. Investments in foreign government bonds involve special risks because
the Fund may have limited legal recourse in the event of default. Also, foreign
securities are sometimes less liquid and more difficult to sell and to value
than securities of US issuers. These risks are greater for investments in
emerging market issuers. In addition, investments in emerging market issuers may
decline in value because of unfavorable foreign government actions, greater
risks of political instability or the absence of accurate information about
emerging market issuers.

Credit risk: The risk that the Fund could lose money if the issuer or guarantor
of a fixed income security, or the counterparty to or guarantor of a derivative
contract, is unable or unwilling to meet its financial obligations. This risk is
likely greater for lower quality investments than for investments that are
higher quality.

High yield bond risk: The risk that the issuer of bonds with ratings of BB (S&P)
or Ba (Moody's) or below, or deemed of equivalent quality, will default or
otherwise be unable to honor a financial obligation (also known as lower-rated
or "junk bonds"). These securities are considered to be predominately
speculative with respect to an issuer's capacity to pay interest and repay
principal in accordance with the terms of the obligations. Lower-quality bonds
are more likely to be subject to an issuer's default or downgrade than
investment grade (higher-quality) bonds.

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.

Geographic concentration risk: The risk that if the Fund has most of its
investments in a single country or region, its portfolio will be more
susceptible to factors adversely affecting issuers located in that country or
region than would a more geographically diverse portfolio of securities.

Non-diversification risk: The Fund is a non-diversified investment company,
which means that the Fund may invest more of its assets in a smaller number of
issuers than a diversified investment company. As a non-diversified fund, the
Fund's share price may be more volatile and the Fund has a greater potential to
realize losses upon the occurrence of adverse events affecting a particular
issuer.

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. Derivatives relating to fixed income
markets are especially susceptible to interest rate risk and credit risk. In
addition, many types of swaps and other 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.

Currency risk: The risk that the changing value of a currency versus the US
dollar may adversely affect the value of an investment. A depreciation in an
invested currency versus the US dollar typically causes the value of the
investment to fall, while an appreciation in an invested currency versus the US
dollar may cause the market value of the investment to rise.

Sovereign debt risk: Investments in foreign sovereign debt obligations involve
certain risks in addition to those relating to foreign securities or debt
securities generally. The issuer of the debt or the governmental authorities
that control the repayment of the debt may be unable or unwilling to repay
principal or interest when due in accordance with the terms of such debt, and
the Fund may have limited recourse in the event of a default against the
defaulting government. Without the approval of debt holders, some governmental
debtors have in the past been able to reschedule or restructure their debt
payments or declare moratoria on payments.

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

Illiquidity risk: The risk that investments cannot be readily sold at the
desired time or price, and the Fund may have to accept a lower price or may not
be able to sell the security at all. An inability to sell securities can
adversely affect the Fund's value or prevent the Fund from taking advantage of
other investment opportunities.

Performance

There is no performance information quoted for the Fund as the Fund had not
completed a full calendar year of operations as of the date of this prospectus.

[1] 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.

[1] "Other expenses" are based on estimates for the current fiscal year, and include "Acquired fund fees and expenses," which are estimated to be less than 0.01% of the average net assets of the Fund.

[2] 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, and 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, and dividend expense and security loan fees for securities sold short), through the period ending October 28, 2013, do not exceed 1.25% for Class A shares, 1.75% for Class C shares and 1.00% 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. 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, the UBS Global AM (Americas)'s three year recoupment rights will survive.

XML

UBS Global Equity Fund (Prospectus Summary) | UBS Global Equity Fund

UBS Global Equity Fund

Investment objective

The Fund seeks to maximize total return, consisting of capital appreciation and
current income.

Fees and expenses

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 17 of the Fund's
prospectus and in "Reduced sales charges, additional purchase, exchange and
redemption information and other services" on page 74 of the Fund's statement of
additional information ("SAI").

Shareholder fees (fees paid directly from your investment)

Shareholder Fees UBS Global Equity Fund		Class A	Class C	Class Y
Maximum front-end sales charge (load) imposed on purchases (as a % of offering price)		5.50%	none	none
Maximum contingent deferred sales charge (load) (CDSC) (as a % of purchase or sales price, whichever is less)	[1]	none	1.00%	none
Redemption fee (as a % of amount redeemed within 90 days of purchase, if applicable)	[1]	1.00%	1.00%	1.00%

Annual fund operating expenses (expenses that you pay each year as a percentage of the value of your investment)

Annual Fund Operating Expenses UBS Global Equity Fund		Class A		Class C		Class Y
Management fees		0.75%		0.75%		0.75%
Distribution and/or service (12b-1) fees		0.25%	[1]	1.00%	[1]	none
Other expenses	[2]	0.61%		0.65%		0.50%
Total annual fund operating expenses		1.61%		2.40%		1.25%
Less management fee waiver/expense reimbursements		0.11%		0.15%		none
Total annual fund operating expenses after management fee waiver/expense reimbursements	[3]	1.50%		2.25%	[1]	1.25%

Example

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:

Expense Example UBS Global Equity Fund (USD $)	Expense Example, with Redemption, 1 Year	Expense Example, with Redemption, 3 Years	Expense Example, with Redemption, 5 Years	Expense Example, with Redemption, 10 Years
Class A	694	1,020	1,368	2,347
Class C	328	734	1,267	2,725
Class Y	127	397	686	1,511

Expense Example, No Redemption (USD $)	Expense Example, No Redemption, 1 Year	Expense Example, No Redemption, 3 Years	Expense Example, No Redemption, 5 Years	Expense Example, No Redemption, 10 Years
UBS Global Equity Fund Class C	228	734	1,267	2,725

Portfolio turnover

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 77%
of the average value of its portfolio.

Principal strategies

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.
Investments in equity securities may include, but are not limited to,
dividend-paying securities, common stock and preferred stock of US and foreign
issuers. The Fund may invest in issuers from both developed and emerging
markets. The Advisor, on behalf of the Fund, intends to diversify broadly among
countries, but reserves the right to invest a substantial portion of the Fund's
assets in one or more countries if economic and business conditions warrant such
investments. The Fund may invest in stocks of companies of any size.

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, forward currency agreements and equity participation notes. All of
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,
all of the derivative instruments listed above may be used for investment
(non-hedging) purposes to earn income; to enhance returns; to replace more
traditional direct investments (except for forward currency agreements); to
obtain exposure to certain markets; or to establish net short positions for
individual currencies (except for equity participation notes).

Management process

In the global universe, the Advisor uses a disciplined price to intrinsic value
approach that seeks to take advantage of pricing anomalies in markets. 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 country, 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
across industries and countries with attractive relative price/value
characteristics.

Main risks

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.

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. These risks are greater for investments
in emerging market issuers. In addition, investments in emerging market issuers
may decline in value because of unfavorable foreign government actions, greater
risks of political instability or the absence of accurate information about
emerging market issuers.

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

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.

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.

Performance

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 and expenses. 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.

UBS Global Equity Fund Annual Total Returns of Class Y Shares

Total return January 1 - September 30, 2012: 12.91%
Best quarter during calendar years shown-2Q 2009: 26.01%
Worst quarter during calendar years shown-4Q 2008: (22.99)%

Average annual total returns (for the periods ended December 31, 2011)

Average Annual Total Returns UBS Global Equity Fund	Label		1 Year	5 Years	10 Years	Inception Date
Class A	Class A Return before taxes		(16.92%)	(4.12%)	2.34%	Jun. 30, 1997
Class C	Class C Return before taxes	[1]	(13.61%)	(3.76%)	2.15%	Nov. 27, 2001
Class Y	Class Y Return before taxes		(11.84%)	(2.70%)	3.24%	Jan. 28, 1994
After Taxes on Distributions Class Y	Class Y Return after taxes on distributions		(11.72%)	(3.22%)	2.81%	Jan. 28, 1994
After Taxes on Distributions and Sales Class Y	Class Y Return after taxes on distributions and sale of fund shares		(7.42%)	(2.46%)	2.63%	Jan. 28, 1994
MSCI World Free Index (net)	MSCI World Free Index (net)		(5.54%)	(2.37%)	3.62%

[1] In connection with the proposed Reorganization of the Fund into the Nationwide Global Equity Fund series of Nationwide Mutual Funds, effective as of the close of business on July 16, 2012, the Fund's Board of Trustees approved the waiver of the annual Rule 12b-1 distribution fee of 0.75% of average net assets that is charged to the shareholders of Class C shares of the Fund. In addition, the Fund has voluntarily lowered the expense limit applicable to Class C shares to 1.50% to reflect the waiver of this Rule 12b-1 distribution fee. The annual service fee of 0.25% of average net assets that is charged on Class A and Class C shares of the Fund was not eliminated. The Board of Trustees also approved the waiver of the 1.00% redemption fee that is charged on sales or exchanges of any Class of shares of the Fund less than 90 days after purchase and the elimination of all contingent deferred sales charges (CDSC) assessed on redemptions that are charged on Class A shares (on purchases above $1 million) and Class C shares. With respect to exchanges of shares of the Fund for shares of another UBS Family Fund, the length of time you held your shares of the UBS Fund will still be considered when determining whether you must pay a CDSC when you sell the shares of the UBS Family Fund acquired in the exchange. These changes are not reflected in the fee and expense tables above or the expense example below.

[1] In connection with the proposed Reorganization of the Fund into the Nationwide Global Equity Fund series of Nationwide Mutual Funds, effective as of the close of business on July 16, 2012, the Fund's Board of Trustees approved the waiver of the annual Rule 12b-1 distribution fee of 0.75% of average net assets that is charged to the shareholders of Class C shares of the Fund. In addition, the Fund has voluntarily lowered the expense limit applicable to Class C shares to 1.50% to reflect the waiver of this Rule 12b-1 distribution fee. The annual service fee of 0.25% of average net assets that is charged on Class A and Class C shares of the Fund was not eliminated. The Board of Trustees also approved the waiver of the 1.00% redemption fee that is charged on sales or exchanges of any Class of shares of the Fund less than 90 days after purchase and the elimination of all contingent deferred sales charges (CDSC) assessed on redemptions that are charged on Class A shares (on purchases above $1 million) and Class C shares. With respect to exchanges of shares of the Fund for shares of another UBS Family Fund, the length of time you held your shares of the UBS Fund will still be considered when determining whether you must pay a CDSC when you sell the shares of the UBS Family Fund acquired in the exchange. These changes are not reflected in the fee and expense tables above or the expense example below.

[2] "Other expenses" include "Acquired fund fees and expenses," which were less than 0.01% of the average net assets of the Fund.

[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 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 28, 2013, do not exceed 1.50% for Class A shares, 2.25% for Class C shares and 1.25% 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. 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, the UBS Global AM (Americas)'s three year recoupment rights will survive.

[1] 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.

XML

Label	Element	Value
Risk Return [Abstract]	rr_RiskReturnAbstract
ProspectusDate	rr_ProspectusDate	Oct. 29, 2012
UBS U.S. Real Estate Equity Fund (Prospectus Summary) | UBS U.S. Real Estate Equity Fund
Risk Return [Abstract]	rr_RiskReturnAbstract
Risk/Return [Heading]	rr_RiskReturnHeading	UBS U.S. Real Estate 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 20 of the Fund's prospectus and in "Reduced sales charges, additional purchase, exchange and redemption information and other services" on page 63 of the Fund's statement of additional information ("SAI").
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)
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.
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
Other Expenses, New Fund, Based on Estimates [Text]	rr_OtherExpensesNewFundBasedOnEstimates	"Other expenses" are based on estimates 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 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 Under normal circumstances, the Fund invests at least 80% of its net assets (plus borrowings for investment purposes, if any) in real estate equity securities of US issuers. These may include real estate investment trusts ("REITs") that own properties or make construction or mortgage loans, real estate developers and companies with substantial real estate holdings and other companies whose products and services are related to the real estate industry, and derive 50% of their assets, gross income or net profits from the real estate industry, such as building supply manufacturers, mortgage lenders, or mortgage service companies. REITs and other real estate securities may be of any market capitalization, including small capitalization ($3 billion or less). Investments in equity securities may include, but are not limited to, common stock and preferred stock. The Fund is a non-diversified fund. The Fund may, but is not required to, use 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 on indices, which may be used for risk management purposes to manage or adjust the risk profile of the Fund. 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 Fund is a sector fund, a category of funds created in response to changing market conditions and for the varied and dynamic needs of shareholders. The Fund focuses on the real estate sector, generally a narrower market segment than many other funds, and may be considered a complement to a diversified investment program. In selecting securities, the Advisor focuses on securities offering the most compelling combination of quality, growth and relative valuation. For each security under analysis, the Advisor bases its assessment of value upon economic, industry and company analysis, as well as upon a company's management team, property portfolio and core competencies. The Advisor actively manages the Fund. As such, increased portfolio turnover may result in higher costs for brokerage commissions, transaction costs and taxable gains.
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. Industry concentration risk: The risk that changes in economic, political or other conditions may have a particularly negative effect on issuers in an industry or sector in which the Fund's investments are concentrated. The Fund invests principally in the real estate sector by purchasing securities issued by REITs. There is, therefore, a risk that changes in real estate values or interest rates, along with economic downturns, can have a substantial impact on the Fund's investments. The Fund's portfolio may be more volatile than a Fund with a broader range of investments. Prepayment or call risk: As a result of declining interest rates, the issuer of a security may exercise its right to prepay principal earlier than scheduled, forcing the Fund to reinvest in lower yielding securities. This is known as call or prepayment risk. 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. Non-diversification risk: The Fund is a non-diversified investment company, which means that the Fund may invest more of its assets in a smaller number of issuers than a diversified investment company. As a non-diversified fund, the Fund's share price may be more volatile and the Fund has a greater potential to realize losses upon the occurrence of adverse events affecting a particular issuer. 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. 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. Management risk: The risk that the investment strategies, techniques and risk analyses employed by the Advisor may not produce the desired results.
Risk Lose Money [Text]	rr_RiskLoseMoney	You may lose money by investing in the Fund.
Risk Nondiversified Status [Text]	rr_RiskNondiversifiedStatus	The Fund is a non-diversified investment company, which means that the Fund may invest more of its assets in a smaller number of issuers than a diversified investment company. As a non-diversified fund, the Fund's share price may be more volatile and the Fund has a greater potential to realize losses upon the occurrence of adverse events affecting a particular issuer.
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	There is no performance information quoted for the Fund as the Fund had not commenced investment operations as of the date of this prospectus.
Performance One Year or Less [Text]	rr_PerformanceOneYearOrLess	There is no performance information quoted for the Fund as the Fund had not commenced investment operations as of the date of this prospectus.
UBS U.S. Real Estate Equity Fund (Prospectus Summary) | UBS U.S. Real Estate Equity Fund | Class A
Risk Return [Abstract]	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_MaximumDeferredSalesChargeOverOfferingPrice	none	[1]
Redemption fee (as a percentage of amount redeemed within 90 days of purchase, if applicable)	rr_RedemptionFeeOverRedemption	(1.00%)
Management fees	rr_ManagementFeesOverAssets	0.90%
Distribution and/or service (12b-1) fees	rr_DistributionAndService12b1FeesOverAssets	0.25%
Other expenses	rr_OtherExpensesOverAssets	0.49%	[2]
Total annual fund operating expenses	rr_ExpensesOverAssets	1.64%
Less management fee waiver/expense reimbursements	rr_FeeWaiverOrReimbursementOverAssets	(0.34%)
Total annual fund operating expenses after management fee waiver/expense reimbursements	rr_NetExpensesOverAssets	1.30%	[3]
Fee Waiver or Reimbursement over Assets, Date of Termination	rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination	2013-10-28
Expense Example, with Redemption, 1 Year	rr_ExpenseExampleYear01	675
Expense Example, with Redemption, 3 Years	rr_ExpenseExampleYear03	1,007
UBS U.S. Real Estate Equity Fund (Prospectus Summary) | UBS U.S. Real Estate Equity Fund | Class C
Risk Return [Abstract]	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	1.00%
Redemption fee (as a percentage of amount redeemed within 90 days of purchase, if applicable)	rr_RedemptionFeeOverRedemption	(1.00%)
Management fees	rr_ManagementFeesOverAssets	0.90%
Distribution and/or service (12b-1) fees	rr_DistributionAndService12b1FeesOverAssets	1.00%
Other expenses	rr_OtherExpensesOverAssets	0.49%	[2]
Total annual fund operating expenses	rr_ExpensesOverAssets	2.39%
Less management fee waiver/expense reimbursements	rr_FeeWaiverOrReimbursementOverAssets	(0.34%)
Total annual fund operating expenses after management fee waiver/expense reimbursements	rr_NetExpensesOverAssets	2.05%	[3]
Fee Waiver or Reimbursement over Assets, Date of Termination	rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination	2013-10-28
Expense Example, with Redemption, 1 Year	rr_ExpenseExampleYear01	308
Expense Example, with Redemption, 3 Years	rr_ExpenseExampleYear03	713
Expense Example, No Redemption, 1 Year	rr_ExpenseExampleNoRedemptionYear01	208
Expense Example, No Redemption, 3 Years	rr_ExpenseExampleNoRedemptionYear03	713
UBS U.S. Real Estate Equity Fund (Prospectus Summary) | UBS U.S. Real Estate Equity Fund | Class Y
Risk Return [Abstract]	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 percentage of amount redeemed within 90 days of purchase, if applicable)	rr_RedemptionFeeOverRedemption	(1.00%)
Management fees	rr_ManagementFeesOverAssets	0.90%
Distribution and/or service (12b-1) fees	rr_DistributionAndService12b1FeesOverAssets	none
Other expenses	rr_OtherExpensesOverAssets	0.49%	[2]
Total annual fund operating expenses	rr_ExpensesOverAssets	1.39%
Less management fee waiver/expense reimbursements	rr_FeeWaiverOrReimbursementOverAssets	(0.34%)
Total annual fund operating expenses after management fee waiver/expense reimbursements	rr_NetExpensesOverAssets	1.05%	[3]
Fee Waiver or Reimbursement over Assets, Date of Termination	rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination	2013-10-28
Expense Example, with Redemption, 1 Year	rr_ExpenseExampleYear01	107
Expense Example, with Redemption, 3 Years	rr_ExpenseExampleYear03	407

[1] 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.

[2] "Other expenses" are based on estimates for the current fiscal year.

[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 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 28, 2013, do not exceed 1.30% for Class A shares, 2.05% for Class C shares and 1.05% 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. 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, the UBS Global AM (Americas)'s three year recoupment rights will survive.

XML

UBS U.S. Small Cap Growth Fund (Prospectus Summary) | UBS U.S. Small Cap Growth Fund

UBS U.S. Small Cap Growth Fund

Investment objective

The Fund seeks to provide long-term capital appreciation.

Fees and expenses

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 37 of the Fund's
prospectus and in "Reduced sales charges, additional purchase, exchange and
redemption information and other services" on page 107 of the Fund's statement
of additional information ("SAI").

Shareholder fees (fees paid directly from your investment)

Shareholder Fees UBS U.S. Small Cap Growth Fund	Class A		Class C	Class Y
Maximum front-end sales charge (load) imposed on purchases (as a % of offering price)	5.50%		none	none
Maximum contingent deferred sales charge (load) (CDSC) (as a % of purchase or sales price, whichever is less)	none	[1]	1.00%	none
Redemption fee (as a % of amount redeemed within 90 days of purchase, if applicable)	1.00%		1.00%	1.00%

Annual fund operating expenses (expenses that you pay each year as a percentage of the value of your investment)

Annual Fund Operating Expenses UBS U.S. Small Cap Growth Fund		Class A	Class C	Class Y
Management fees		0.85%	0.85%	0.85%
Distribution and/or service (12b-1) fees		0.25%	1.00%	none
Other expenses		0.47%	0.50%	0.30%
Acquired fund fees and expenses		0.01%	0.01%	0.01%
Total annual fund operating expenses	[1]	1.58%	2.36%	1.16%
Less management fee waiver/expense reimbursements		0.17%	0.20%	none
Total annual fund operating expenses after management fee waiver/expense reimbursements	[1][2]	1.41%	2.16%	1.16%

Example

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:

Expense Example UBS U.S. Small Cap Growth Fund (USD $)	Expense Example, with Redemption, 1 Year	Expense Example, with Redemption, 3 Years	Expense Example, with Redemption, 5 Years	Expense Example, with Redemption, 10 Years
Class A	686	1,006	1,348	2,311
Class C	319	717	1,242	2,681
Class Y	118	368	638	1,409

Expense Example, No Redemption (USD $)	Expense Example, No Redemption, 1 Year	Expense Example, No Redemption, 3 Years	Expense Example, No Redemption, 5 Years	Expense Example, No Redemption, 10 Years
UBS U.S. Small Cap Growth Fund Class C	219	717	1,242	2,681

Portfolio turnover

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 48%
of the average value of its portfolio.

Principal strategies

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.

Main risks

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.

Performance

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.

UBS U.S. Small Cap Growth Fund Annual Total Returns of Class Y Shares

Total return January 1 - September 30, 2012: 19.85%
Best quarter during calendar years shown-2Q 2003: 20.83%
Worst quarter during calendar years shown-4Q 2008: (32.03)%

Average annual total returns (for the periods ended December 31, 2011)

Average Annual Total Returns UBS U.S. Small Cap Growth Fund	Label		1 Year	5 Years	10 Years	Inception Date
Class A	Class A Return before taxes		(6.04%)	0.17%	4.22%	Dec. 31, 1998
Class C	Class C Return before taxes	[1]	(2.25%)	0.57%	4.03%	Nov. 19, 2001
Class Y	Class Y Return before taxes		(0.33%)	1.58%	5.07%	Sep. 30, 1997
After Taxes on Distributions Class Y	Class Y Return after taxes on distributions		(0.33%)	1.26%	4.77%	Sep. 30, 1997
After Taxes on Distributions and Sales Class Y	Class Y Return after taxes on distributions and sale of fund shares		(0.22%)	1.23%	4.36%	Sep. 30, 1997
Russell 2000 Growth Index	Russell 2000 Growth Index		(2.91%)	2.09%	4.48%

[1] 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.

[1] 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.

[2] 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, and 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, and dividend expense and security loan fees for securities sold short), through the period ending October 28, 2013, do not exceed 1.40% for Class A 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. 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, the UBS Global AM (Americas)'s three year recoupment rights will survive.

[1] 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.

XML

Label	Element	Value
Risk Return [Abstract]	rr_RiskReturnAbstract
ProspectusDate	rr_ProspectusDate	Oct. 29, 2012
UBS Emerging Markets Debt Fund (Prospectus Summary) | UBS Emerging Markets Debt Fund
Risk Return [Abstract]	rr_RiskReturnAbstract
Risk/Return [Heading]	rr_RiskReturnHeading	UBS Emerging Markets Debt 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 34 of the Fund's prospectus and in "Reduced sales charges, additional purchase, exchange and redemption information and other services" on page 107 of the Fund's statement of additional information ("SAI").
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)
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.
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
Other Expenses, New Fund, Based on Estimates [Text]	rr_OtherExpensesNewFundBasedOnEstimates	"Other expenses" are based on estimates for the current fiscal year, and include "Acquired fund fees and expenses," which are estimated to be less than 0.01% of the average net assets of the Fund.
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 Under normal circumstances, the Fund invests at least 80% of its net assets (plus borrowings for investment purposes, if any) in debt securities and other debt instruments that are tied economically to emerging market countries. Such investments may include, but are not limited to, debt securities issued by governments, government-related entities, corporations, supranational entities and entities organized to restructure outstanding debt of issuers in emerging markets, and instruments whose return is derived from any of the foregoing. The Fund may invest in debt instruments of all types and denominated in any currency. These may include, but are not limited to, bonds, debentures, notes, convertible securities, loans and related assignments and participations, when-issued and delayed-delivery securities, mortgage-backed and other types of asset-backed securities issued on a public or private basis, and cash equivalents. The Fund is a non-diversified fund. 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 options (including, but not limited to, options on futures, forwards and swap agreements), futures, forward agreements, swap agreements (specifically, interest rate, total return, currency, credit default and inflation swaps), credit-linked securities and structured investments. All of these derivatives may be used for risk management purposes, such as hedging against a specific security or currency, or to manage or adjust the risk profile of the Fund. In addition, all of the derivative instruments listed above may be used for investment (non-hedging) purposes to earn income; to enhance returns; to replace more traditional direct investments; to obtain exposure to certain markets; to establish net short positions for individual sectors, markets, currencies or securities; or to adjust the Fund's portfolio duration. The Fund intends to invest primarily in a portfolio of debt securities located in at least three emerging market countries, which may be located in Asia, Europe, Latin America, Africa or the Middle East. An emerging market country is a country defined as an emerging or developing economy by any of the World Bank, the International Finance Corporation or the United Nations or its authorities. Additionally, the Fund, for purposes of its investments, may consider a country included in JP Morgan or MSCI emerging markets indices to be an emerging market country. The countries included in this definition will change over time. A substantial amount of the Fund's assets may be invested in higher-yielding, lower-rated bonds ("junk bonds"). Lower-rated bonds are bonds rated in the lower rating categories of Moody's Investors Service, Inc. ("Moody's") and Standard & Poor's Ratings Group ("S&P"), including securities rated Ba or lower by Moody's and BB or lower by S&P. Derivative instruments such as swaps, options, futures, credit linked or structured investments or other debt instruments that are tied economically to emerging market countries may be used to satisfy the Fund's 80% investment policy. Management process The investment process is based on fundamental analysis, coupling a top-down strategy with an equally important bottom-up security selection strategy. The Advisor manages and monitors risk/return trade-offs in a disciplined manner across country allocation, sector allocation, issue selection, duration/yield curve positioning, and currency management. Proprietary valuation and risk models enhance seasoned professional judgment. The investment process is founded upon the Advisor's conviction that discrepancies occur between market prices and fundamental values. In the case of emerging markets debt, price volatility generally exceeds that of the underlying macroeconomic fundamentals. The investment team takes advantage of these discrepancies by applying a disciplined approach to measure fundamental value from the perspective of a long-term investor. The investment decision-making process can be divided up into three parts-country, currency and security selection. Country selection The Advisor decides on country over- and under-weights relative to the Fund's custom benchmark, the Emerging Markets Debt Benchmark Index, which is comprised of 50% J.P. Morgan Emerging Markets Bond Index Global (EMBI Global) and 50% J.P. Morgan Government Bond Index-Emerging Markets Global Diversified (GBI-EM Global Diversified), by using a price/value framework. Subjective judgments, such as political risk assessment, also affect the final country decision. Currency selection The Advisor searches for currencies that will outperform market expectations, given the Advisor's currency and market views. The Advisor also seeks to identify potential sales in the Fund's portfolio when risk is not being compensated by expected return. Typically, the Fund obtains exposure to local currencies via bonds denominated in local currency or derivative positions. Security selection The Advisor searches for bonds that will outperform market expectations, given the Advisor's country and market views. The Advisor also seeks to identify potential sales in the Fund's portfolio when risk is not being compensated by expected return. Typically, the Fund invests in sovereign bonds, denominated in US dollars as well as in local currencies. The Advisor also examines local market bond and corporate bond opportunities. The Advisor's analysis of emerging market bonds is enhanced by an advanced in-house emerging market bond analytics database. The database is specially designed to assimilate the characteristics of emerging market bonds; it allows the Advisor to perform detailed instrument-level analysis. In addition to macroeconomic research, bottom-up input-such as liquidity considerations, volatility and company risk for specific bonds, to name a few, is also crucial in the Advisor's decision making process.
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. Interest rate risk: An increase in prevailing interest rates typically causes the value of fixed income securities to fall. Changes in interest rates will likely affect the value of longer-duration fixed income securities more than shorter-duration securities and higher quality securities more than lower quality securities. When interest rates are falling, some fixed income securities provide that the issuer may repay them earlier than the maturity date, and if this occurs the Fund may have to reinvest these repayments at lower interest 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 and due to decreases in foreign currency values relative to the US dollar. Investments in foreign government bonds involve special risks because the Fund may have limited legal recourse in the event of default. Also, foreign securities are sometimes less liquid and more difficult to sell and to value than securities of US issuers. These risks are greater for investments in emerging market issuers. In addition, investments in emerging market issuers may decline in value because of unfavorable foreign government actions, greater risks of political instability or the absence of accurate information about emerging market issuers. Credit risk: The risk that the Fund could lose money if the issuer or guarantor of a fixed income security, or the counterparty to or guarantor of a derivative contract, is unable or unwilling to meet its financial obligations. This risk is likely greater for lower quality investments than for investments that are higher quality. High yield bond risk: The risk that the issuer of bonds with ratings of BB (S&P) or Ba (Moody's) or below, or deemed of equivalent quality, will default or otherwise be unable to honor a financial obligation (also known as lower-rated or "junk bonds"). These securities are considered to be predominately speculative with respect to an issuer's capacity to pay interest and repay principal in accordance with the terms of the obligations. Lower-quality bonds are more likely to be subject to an issuer's default or downgrade than investment grade (higher-quality) bonds. 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. Geographic concentration risk: The risk that if the Fund has most of its investments in a single country or region, its portfolio will be more susceptible to factors adversely affecting issuers located in that country or region than would a more geographically diverse portfolio of securities. Non-diversification risk: The Fund is a non-diversified investment company, which means that the Fund may invest more of its assets in a smaller number of issuers than a diversified investment company. As a non-diversified fund, the Fund's share price may be more volatile and the Fund has a greater potential to realize losses upon the occurrence of adverse events affecting a particular issuer. 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. Derivatives relating to fixed income markets are especially susceptible to interest rate risk and credit risk. In addition, many types of swaps and other 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. Currency risk: The risk that the changing value of a currency versus the US dollar may adversely affect the value of an investment. A depreciation in an invested currency versus the US dollar typically causes the value of the investment to fall, while an appreciation in an invested currency versus the US dollar may cause the market value of the investment to rise. Sovereign debt risk: Investments in foreign sovereign debt obligations involve certain risks in addition to those relating to foreign securities or debt securities generally. The issuer of the debt or the governmental authorities that control the repayment of the debt may be unable or unwilling to repay principal or interest when due in accordance with the terms of such debt, and the Fund may have limited recourse in the event of a default against the defaulting government. Without the approval of debt holders, some governmental debtors have in the past been able to reschedule or restructure their debt payments or declare moratoria on payments. Management risk: The risk that the investment strategies, techniques and risk analyses employed by the Advisor may not produce the desired results. Illiquidity risk: The risk that investments cannot be readily sold at the desired time or price, and the Fund may have to accept a lower price or may not be able to sell the security at all. An inability to sell securities can adversely affect the Fund's value or prevent the Fund from taking advantage of other investment opportunities.
Risk Lose Money [Text]	rr_RiskLoseMoney	You may lose money by investing in the Fund.
Risk Nondiversified Status [Text]	rr_RiskNondiversifiedStatus	The Fund is a non-diversified investment company, which means that the Fund may invest more of its assets in a smaller number of issuers than a diversified investment company. As a non-diversified fund, the Fund's share price may be more volatile and the Fund has a greater potential to realize losses upon the occurrence of adverse events affecting a particular issuer.
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	There is no performance information quoted for the Fund as the Fund had not completed a full calendar year of operations as of the date of this prospectus.
Performance One Year or Less [Text]	rr_PerformanceOneYearOrLess	There is no performance information quoted for the Fund as the Fund had not completed a full calendar year of operations as of the date of this prospectus.
UBS Emerging Markets Debt Fund (Prospectus Summary) | UBS Emerging Markets Debt Fund | Class A
Risk Return [Abstract]	rr_RiskReturnAbstract
Maximum front-end sales charge (load) imposed on purchases (as a % of offering price)	rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice	4.50%
Maximum contingent deferred sales charge (load) (CDSC) (as a % of purchase or sales price, whichever is less)	rr_MaximumDeferredSalesChargeOverOfferingPrice	none	[1]
Redemption fee (as a percentage of amount redeemed within 90 days of purchase, if applicable)	rr_RedemptionFeeOverRedemption	(1.00%)
Management fees	rr_ManagementFeesOverAssets	0.75%
Distribution and/or service (12b-1) fees	rr_DistributionAndService12b1FeesOverAssets	0.25%
Other expenses	rr_OtherExpensesOverAssets	0.84%	[2]
Total annual fund operating expenses	rr_ExpensesOverAssets	1.84%
Less management fee waiver/expense reimbursements	rr_FeeWaiverOrReimbursementOverAssets	(0.59%)
Total annual fund operating expenses after management fee waiver/expense reimbursements	rr_NetExpensesOverAssets	1.25%	[3]
Fee Waiver or Reimbursement over Assets, Date of Termination	rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination	2013-10-28
Expense Example, with Redemption, 1 Year	rr_ExpenseExampleYear01	572
Expense Example, with Redemption, 3 Years	rr_ExpenseExampleYear03	948
UBS Emerging Markets Debt Fund (Prospectus Summary) | UBS Emerging Markets Debt Fund | Class C
Risk Return [Abstract]	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	0.75%
Redemption fee (as a percentage of amount redeemed within 90 days of purchase, if applicable)	rr_RedemptionFeeOverRedemption	(1.00%)
Management fees	rr_ManagementFeesOverAssets	0.75%
Distribution and/or service (12b-1) fees	rr_DistributionAndService12b1FeesOverAssets	0.75%
Other expenses	rr_OtherExpensesOverAssets	0.84%	[2]
Total annual fund operating expenses	rr_ExpensesOverAssets	2.34%
Less management fee waiver/expense reimbursements	rr_FeeWaiverOrReimbursementOverAssets	(0.59%)
Total annual fund operating expenses after management fee waiver/expense reimbursements	rr_NetExpensesOverAssets	1.75%	[3]
Fee Waiver or Reimbursement over Assets, Date of Termination	rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination	2013-10-28
Expense Example, with Redemption, 1 Year	rr_ExpenseExampleYear01	253
Expense Example, with Redemption, 3 Years	rr_ExpenseExampleYear03	674
Expense Example, No Redemption, 1 Year	rr_ExpenseExampleNoRedemptionYear01	178
Expense Example, No Redemption, 3 Years	rr_ExpenseExampleNoRedemptionYear03	674
UBS Emerging Markets Debt Fund (Prospectus Summary) | UBS Emerging Markets Debt Fund | Class Y
Risk Return [Abstract]	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 percentage of amount redeemed within 90 days of purchase, if applicable)	rr_RedemptionFeeOverRedemption	(1.00%)
Management fees	rr_ManagementFeesOverAssets	0.75%
Distribution and/or service (12b-1) fees	rr_DistributionAndService12b1FeesOverAssets	none
Other expenses	rr_OtherExpensesOverAssets	0.84%	[2]
Total annual fund operating expenses	rr_ExpensesOverAssets	1.59%
Less management fee waiver/expense reimbursements	rr_FeeWaiverOrReimbursementOverAssets	(0.59%)
Total annual fund operating expenses after management fee waiver/expense reimbursements	rr_NetExpensesOverAssets	1.00%	[3]
Fee Waiver or Reimbursement over Assets, Date of Termination	rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination	2013-10-28
Expense Example, with Redemption, 1 Year	rr_ExpenseExampleYear01	102
Expense Example, with Redemption, 3 Years	rr_ExpenseExampleYear03	444

[1] 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.

[2] "Other expenses" are based on estimates for the current fiscal year, and include "Acquired fund fees and expenses," which are estimated to be less than 0.01% of the average net assets of the Fund.

[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, and 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, and dividend expense and security loan fees for securities sold short), through the period ending October 28, 2013, do not exceed 1.25% for Class A shares, 1.75% for Class C shares and 1.00% 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. 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, the UBS Global AM (Americas)'s three year recoupment rights will survive.

XML

UBS U.S. Equity Alpha Fund (Prospectus Summary) | UBS U.S. Equity Alpha Fund

UBS U.S. Equity Alpha Fund

Investment objective

The Fund seeks to maximize total return, consisting of capital appreciation and
current income, while controlling risk.

Fees and expenses

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 11 of the Fund's
prospectus and in "Reduced sales charges, additional purchase, exchange and
redemption information and other services" on page 53 of the Fund's statement of
additional information ("SAI").

Shareholder fees (fees paid directly from your investment)

Shareholder Fees UBS U.S. Equity Alpha Fund	Class A		Class C	Class Y
Maximum front-end sales charge (load) imposed on purchases (as a % of offering price)	5.50%		none	none
Maximum contingent deferred sales charge (load) (CDSC) (as a % of purchase or sales price, whichever is less)	none	[1]	1.00%	none
Redemption fee (as a % of amount redeemed within 90 days of purchase, if applicable)	1.00%		1.00%	1.00%

Annual fund operating expenses (expenses that you pay each year as a percentage of the value of your investment)

Annual Fund Operating Expenses UBS U.S. Equity Alpha Fund		Class A	Class C	Class Y
Management fees		1.00%	1.00%	1.00%
Distribution and/or service (12b-1) fees		0.25%	1.00%	none
Dividend expense and security loan fees for securities sold short		0.71%	0.71%	0.68%
Other		1.25%	1.33%	1.17%
Total other expenses		1.96%	2.04%	1.85%
Acquired fund fees and expenses		0.01%	0.01%	0.01%
Total annual fund operating expenses	[1]	3.22%	4.05%	2.86%
Less management fee waiver/expense reimbursements		1.00%	1.08%	0.92%
Total annual fund operating expenses after management fee waiver/expense reimbursements	[1][2]	2.22%	2.97%	1.94%

Example

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:

Expense Example UBS U.S. Equity Alpha Fund (USD $)	Expense Example, with Redemption, 1 Year	Expense Example, with Redemption, 3 Years	Expense Example, with Redemption, 5 Years	Expense Example, with Redemption, 10 Years
Class A	763	1,399	2,059	3,813
Class C	400	1,134	1,985	4,182
Class Y	197	799	1,427	3,119

Expense Example, No Redemption (USD $)	Expense Example, No Redemption, 1 Year	Expense Example, No Redemption, 3 Years	Expense Example, No Redemption, 5 Years	Expense Example, No Redemption, 10 Years
UBS U.S. Equity Alpha Fund Class C	300	1,134	1,985	4,182

Portfolio turnover

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 85%
of the average value of its portfolio.

Principal strategies

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
companies. The Fund will generally invest in equity securities of large and mid
capitalization companies but is permitted to invest up to 15% of its net assets
in small capitalization companies. The Fund will maintain both long positions
and short positions in equity securities and securities with equity-like
characteristics. In addition, up to 20% of the Fund's net assets may be invested
in securities of foreign companies in developed countries, including long and
short positions in foreign equity securities and securities with equity-like
characteristics.

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.

The Fund may also invest in exchange-traded funds ("ETFs") and similarly
structured pooled investments in order to provide exposure to the equity markets
while maintaining liquidity. The Fund may also engage in short sales of ETFs and
similarly structured pooled investments in order to reduce exposure to certain
sectors of the equity markets.

Management process

The Advisor's investment style is singularly focused on investment fundamentals.
The Advisor believes that investment fundamentals determine and describe future
cash flows that define fundamental investment value. The Advisor tries to
identify and exploit periodic discrepancies between market prices and
fundamental value. These price/value discrepancies are used as the building
blocks for portfolio construction.

In constructing the Fund's portfolio, the Advisor primarily uses fundamental
analysis and, to a lesser extent, quantitative analysis to identify securities
that are underpriced and overpriced relative to their fundamental value. In
general, the Advisor buys securities "long" for the Fund's portfolio that it
believes are underpriced and will outperform, and sells securities "short" that
it believes are overpriced and will underperform. The Fund anticipates that it
will normally maintain long positions in equity securities and securities with
equity-like characteristics equal to 120% to 140% of the value of its net
assets, short positions in equity securities and securities with equity-like
characteristics equal to 20% to 40% of the value of its net assets and cash
positions equal to 0% to 10% of the value of its net assets. This active
management process is intended to produce performance that outperforms the
Fund's benchmark. The Fund's ability to fully implement its investment strategy
may be affected by (i) regulatory restrictions prohibiting short sales of
certain securities that may be imposed from time to time or (ii) the Advisor's
written procedures designed to address potential conflicts that exist where the
Advisor manages both long-only and long/short accounts and/or funds.

In employing its investment strategies for the Fund, the Advisor attempts to
outperform (before taking into account any Fund fees or expenses) the Russell
1000 Index by 2.50% to 5.00% per year with a similar level of market risk as the
benchmark over a full market cycle. A typical market cycle is 4 to 7 years. The
Advisor does not represent or guarantee that the Fund will meet this total return
goal.

Main risks

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.

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

Short sales risk: There are certain unique risks associated with the use of
short sales strategies. When selling a security short, the Advisor will sell a
security it does not own at the then-current market price and then borrow the
security to deliver to the buyer. The Fund is then obligated to buy the security
on a later date so it can return the security to the lender. Short sales
therefore involve the risk that the Fund will incur a loss by subsequently
buying a security at a higher price than the price at which the Fund previously
sold the security short. This would occur if the securities lender required the
Fund to deliver the securities the Fund had borrowed at the commencement of the
short sale and the Fund was unable to either purchase the security at a
favorable price or to borrow the security from another securities lender. If
this occurs at a time when other short sellers of the security also want to
close out their positions, a "short squeeze" can occur. A short squeeze occurs
when demand is greater than supply for the security sold short. Moreover,
because the Fund's loss on a short sale arises from increases in the value of
the security sold short, such loss, like the price of the security sold short,
is theoretically unlimited. By contrast, the Fund's loss on a long position
arises from decreases in the value of the security and therefore is limited by
the fact that a security's value cannot drop below zero. It is possible that the
Fund's securities held long will decline in value at the same time that the
value of the securities sold short increases, thereby increasing the potential
for loss.

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.

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.

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.

Unseasoned company risk: The Fund may invest in relatively new or unseasoned
companies that are in their early stages of development. Securities of
unseasoned companies present greater risks than securities of larger, more
established companies. The companies may have greater risks because they (i) may
be dependent on a small number of products or services; (ii) may lack
substantial capital reserves; and (iii) do not have proven track records.

Performance

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.

UBS U.S. Equity Alpha Fund Annual Total Returns of Class Y Shares (2007 is the Fund's first full year of operations)

Total return January 1 - September 30, 2012: 12.11%
Best quarter during calendar years shown-2Q 2009: 23.05%
Worst quarter during calendar years shown-4Q 2008: (27.94)%

Average annual total returns (for the periods ended December 31, 2011)

Average Annual Total Returns UBS U.S. Equity Alpha Fund	Label	1 Year	5 Years	Since Inception	Inception Date
Class A	Class A Return before taxes	(8.30%)	(4.81%)	(3.06%)	Sep. 26, 2006
Class C	Class C Return before taxes	(4.76%)	(4.46%)	(2.76%)	Sep. 26, 2006
Class Y	Class Y Return before taxes	(2.72%)	(3.47%)	(1.78%)	Sep. 26, 2006
After Taxes on Distributions Class Y	Class Y Return after taxes on distributions	(2.79%)	(3.90%)	(2.20%)	Sep. 26, 2006
After Taxes on Distributions and Sales Class Y	Class Y Return after taxes on distributions and sale of fund shares	(1.69%)	(3.06%)	(1.64%)	Sep. 26, 2006
Russell 1000 Index	Russell 1000 Index	1.50%	(0.02%)	1.25%

[1] 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.

[1] 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.

[2] 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, and 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, and dividend expense and security loan fees for securities sold short), through the period ending October 28, 2013, otherwise do not exceed 1.50% for Class A shares, 2.25% for Class C shares and 1.25% 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. 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, the UBS Global AM (Americas)'s three year recoupment rights will survive.

XML

Label	Element	Value
Risk Return [Abstract]	rr_RiskReturnAbstract
ProspectusDate	rr_ProspectusDate	Oct. 29, 2012
UBS U.S. Large Cap Equity Fund (Prospectus Summary) | UBS U.S. Large Cap Equity Fund
Risk Return [Abstract]	rr_RiskReturnAbstract
Risk/Return [Heading]	rr_RiskReturnHeading	UBS U.S. Large Cap 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 37 of the Fund's prospectus and in "Reduced sales charges, additional purchase, exchange and redemption information and other services" on page 107 of the Fund's statement of additional information ("SAI").
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)
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 65% of the average value of its portfolio.
Portfolio Turnover, Rate	rr_PortfolioTurnoverRate	65.00%
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 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 large capitalization companies. The Fund defines large capitalization companies as those with a market capitalization of at least $3 billion. The Fund may invest up to 20% of its net assets in the securities of US companies that have market capitalizations within the range of the Russell 1000 Index but below $3 billion in market capitalization and/or the securities of foreign companies in developed countries. 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 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. Management 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.
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. Management risk: The risk that the investment strategies, techniques and risk analyses employed by the Advisor may not produce the desired results. 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. 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. 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 Returns [Text]	rr_PerformanceInformationIllustratesVariabilityOfReturns	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.
Performance Availability Website Address [Text]	rr_PerformanceAvailabilityWebSiteAddress	http://globalam-us.ubs.com/corpweb/performance.do
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	UBS U.S. Large Cap Equity Fund Annual Total Returns Of Class Y Shares
Bar Chart Closing [Text Block]	rr_BarChartClosingTextBlock	Total return January 1 - September 30, 2012: 12.82% Best quarter during calendar years shown-2Q 2009: 19.55% Worst quarter during calendar years shown-4Q 2008: (26.34)%
Index No Deduction for Fees, Expenses, Taxes [Text]	rr_IndexNoDeductionForFeesExpensesTaxes	Index 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	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 Y shares' after-tax returns shown.
Caption	rr_AverageAnnualReturnCaption	Average annual total returns (for the periods ended December 31, 2011)
UBS U.S. Large Cap Equity Fund (Prospectus Summary) | UBS U.S. Large Cap Equity Fund | Russell 1000 Index
Risk Return [Abstract]	rr_RiskReturnAbstract
Label	rr_AverageAnnualReturnLabel	Russell 1000 Index
1 Year	rr_AverageAnnualReturnYear01	1.50%
5 Years	rr_AverageAnnualReturnYear05	(0.02%)
10 Years	rr_AverageAnnualReturnYear10	3.35%
UBS U.S. Large Cap Equity Fund (Prospectus Summary) | UBS U.S. Large Cap Equity Fund | Class A
Risk Return [Abstract]	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_MaximumDeferredSalesChargeOverOfferingPrice	none	[1]
Redemption fee (as a % of amount redeemed within 90 days of purchase, if applicable)	rr_RedemptionFeeOverRedemption	(1.00%)
Management fees	rr_ManagementFeesOverAssets	0.70%
Distribution and/or service (12b-1) fees	rr_DistributionAndService12b1FeesOverAssets	0.25%
Other expenses	rr_OtherExpensesOverAssets	0.29%	[2]
Total annual fund operating expenses	rr_ExpensesOverAssets	1.24%
Less management fee waiver/expense reimbursements	rr_FeeWaiverOrReimbursementOverAssets	(0.04%)
Total annual fund operating expenses after management fee waiver/expense reimbursements	rr_NetExpensesOverAssets	1.20%	[3]
Fee Waiver or Reimbursement over Assets, Date of Termination	rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination	2013-10-28
Expense Example, with Redemption, 1 Year	rr_ExpenseExampleYear01	666
Expense Example, with Redemption, 3 Years	rr_ExpenseExampleYear03	918
Expense Example, with Redemption, 5 Years	rr_ExpenseExampleYear05	1,190
Expense Example, with Redemption, 10 Years	rr_ExpenseExampleYear10	1,964
Label	rr_AverageAnnualReturnLabel	Class A Return before taxes
1 Year	rr_AverageAnnualReturnYear01	(8.44%)
5 Years	rr_AverageAnnualReturnYear05	(3.93%)
10 Years	rr_AverageAnnualReturnYear10	2.17%
Inception Date	rr_AverageAnnualReturnInceptionDate	Jun. 30, 1997
UBS U.S. Large Cap Equity Fund (Prospectus Summary) | UBS U.S. Large Cap Equity Fund | Class C
Risk Return [Abstract]	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	1.00%
Redemption fee (as a % of amount redeemed within 90 days of purchase, if applicable)	rr_RedemptionFeeOverRedemption	(1.00%)
Management fees	rr_ManagementFeesOverAssets	0.70%
Distribution and/or service (12b-1) fees	rr_DistributionAndService12b1FeesOverAssets	1.00%
Other expenses	rr_OtherExpensesOverAssets	0.32%	[2]
Total annual fund operating expenses	rr_ExpensesOverAssets	2.02%
Less management fee waiver/expense reimbursements	rr_FeeWaiverOrReimbursementOverAssets	(0.07%)
Total annual fund operating expenses after management fee waiver/expense reimbursements	rr_NetExpensesOverAssets	1.95%	[3]
Fee Waiver or Reimbursement over Assets, Date of Termination	rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination	2013-10-28
Expense Example, with Redemption, 1 Year	rr_ExpenseExampleYear01	298
Expense Example, with Redemption, 3 Years	rr_ExpenseExampleYear03	627
Expense Example, with Redemption, 5 Years	rr_ExpenseExampleYear05	1,082
Expense Example, with Redemption, 10 Years	rr_ExpenseExampleYear10	2,342
Expense Example, No Redemption, 1 Year	rr_ExpenseExampleNoRedemptionYear01	198
Expense Example, No Redemption, 3 Years	rr_ExpenseExampleNoRedemptionYear03	627
Expense Example, No Redemption, 5 Years	rr_ExpenseExampleNoRedemptionYear05	1,082
Expense Example, No Redemption, 10 Years	rr_ExpenseExampleNoRedemptionYear10	2,342
Label	rr_AverageAnnualReturnLabel	Class C Return before taxes	[4]
1 Year	rr_AverageAnnualReturnYear01	(4.84%)
5 Years	rr_AverageAnnualReturnYear05	(3.56%)
10 Years	rr_AverageAnnualReturnYear10	2.00%
Inception Date	rr_AverageAnnualReturnInceptionDate	Nov. 13, 2001
UBS U.S. Large Cap Equity Fund (Prospectus Summary) | UBS U.S. Large Cap Equity Fund | Class Y
Risk Return [Abstract]	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 fees	rr_ManagementFeesOverAssets	0.70%
Distribution and/or service (12b-1) fees	rr_DistributionAndService12b1FeesOverAssets	none
Other expenses	rr_OtherExpensesOverAssets	0.27%	[2]
Total annual fund operating expenses	rr_ExpensesOverAssets	0.97%
Less management fee waiver/expense reimbursements	rr_FeeWaiverOrReimbursementOverAssets	(0.02%)
Total annual fund operating expenses after management fee waiver/expense reimbursements	rr_NetExpensesOverAssets	0.95%	[3]
Fee Waiver or Reimbursement over Assets, Date of Termination	rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination	2013-10-28
Expense Example, with Redemption, 1 Year	rr_ExpenseExampleYear01	97
Expense Example, with Redemption, 3 Years	rr_ExpenseExampleYear03	307
Expense Example, with Redemption, 5 Years	rr_ExpenseExampleYear05	534
Expense Example, with Redemption, 10 Years	rr_ExpenseExampleYear10	1,188
Annual Return 2002	rr_AnnualReturn2002	(16.55%)
Annual Return 2003	rr_AnnualReturn2003	30.47%
Annual Return 2004	rr_AnnualReturn2004	13.34%
Annual Return 2005	rr_AnnualReturn2005	9.06%
Annual Return 2006	rr_AnnualReturn2006	14.28%
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%)
Year to Date Return, Label	rr_YearToDateReturnLabel	Total return January 1 - September 30, 2012:
Bar Chart, Year to Date Return, Date	rr_BarChartYearToDateReturnDate	Sep. 30, 2012
Bar Chart, Year to Date Return	rr_BarChartYearToDateReturn	12.82%
Highest Quarterly Return, Label	rr_HighestQuarterlyReturnLabel	Best quarter during calendar years shown-2Q 2009:
Highest Quarterly Return, Date	rr_BarChartHighestQuarterlyReturnDate	Jun. 30, 2009
Highest Quarterly Return	rr_BarChartHighestQuarterlyReturn	19.55%
Lowest Quarterly Return, Label	rr_LowestQuarterlyReturnLabel	Worst quarter during calendar years shown-4Q 2008:
Lowest Quarterly Return, Date	rr_BarChartLowestQuarterlyReturnDate	Dec. 31, 2008
Lowest Quarterly Return	rr_BarChartLowestQuarterlyReturn	(26.34%)
Label	rr_AverageAnnualReturnLabel	Class Y Return before taxes
1 Year	rr_AverageAnnualReturnYear01	(2.83%)
5 Years	rr_AverageAnnualReturnYear05	(2.57%)
10 Years	rr_AverageAnnualReturnYear10	3.05%
Inception Date	rr_AverageAnnualReturnInceptionDate	Feb. 22, 1994
UBS U.S. Large Cap Equity Fund (Prospectus Summary) | UBS U.S. Large Cap Equity Fund | Class Y | After Taxes on Distributions
Risk Return [Abstract]	rr_RiskReturnAbstract
Label	rr_AverageAnnualReturnLabel	Class Y Return after taxes on distributions
1 Year	rr_AverageAnnualReturnYear01	(2.98%)
5 Years	rr_AverageAnnualReturnYear05	(3.06%)
10 Years	rr_AverageAnnualReturnYear10	2.49%
Inception Date	rr_AverageAnnualReturnInceptionDate	Feb. 22, 1994
UBS U.S. Large Cap Equity Fund (Prospectus Summary) | UBS U.S. Large Cap Equity Fund | Class Y | After Taxes on Distributions and Sales
Risk Return [Abstract]	rr_RiskReturnAbstract
Label	rr_AverageAnnualReturnLabel	Class Y Return after taxes on distributions and sale of fund shares
1 Year	rr_AverageAnnualReturnYear01	(1.66%)
5 Years	rr_AverageAnnualReturnYear05	(2.27%)
10 Years	rr_AverageAnnualReturnYear10	2.51%
Inception Date	rr_AverageAnnualReturnInceptionDate	Feb. 22, 1994

[1] 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.

[2] "Other expenses" include "Acquired fund fees and expenses," which were less than 0.01% of the average net assets of the Fund.

[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 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 28, 2013, do not exceed 1.20% for Class A shares, 1.95% for Class C shares and 0.95% 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. 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, the UBS Global AM (Americas)'s three year recoupment rights will survive.

[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.

XML

Label	Element	Value
Risk Return [Abstract]	rr_RiskReturnAbstract
ProspectusDate	rr_ProspectusDate	Oct. 29, 2012
UBS U.S. Small Cap Equity Fund (Prospectus Summary) | UBS U.S. Small Cap Equity Fund
Risk Return [Abstract]	rr_RiskReturnAbstract
Risk/Return [Heading]	rr_RiskReturnHeading	UBS U.S. Small Cap 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 20 of the Fund's prospectus and in "Reduced sales charges, additional purchase, exchange and redemption information and other services" on page 63 of the Fund's statement of additional information ("SAI").
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)
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.
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
Other Expenses, New Fund, Based on Estimates [Text]	rr_OtherExpensesNewFundBasedOnEstimates	"Other expenses" are based on estimates 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 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 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 $3 billion or less. Investments in equity securities may include, but are not limited to, dividend-paying securities, common stock and preferred stock. The Fund is a non-diversified fund. The Fund may, but is not required to, use 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 on indices, which may be used for risk management purposes to manage or adjust the risk profile of the Fund. 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 The Advisor looks for companies with strong and innovative management, good financial controls, increasing market share, diversified product/service offerings and low market-to-sales ratios relative to similar companies. 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 Fund 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 Fund will invest in companies within its capitalization range as described above. However, the Fund may invest a portion of its assets in securities outside of this range. Further, if movement in the market price causes a security to change from one capitalization range to another, the Fund is not required to dispose of the security.
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. 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. Non-diversification risk: The Fund is a non-diversified investment company, which means that the Fund may invest more of its assets in a smaller number of issuers than a diversified investment company. As a non-diversified fund, the Fund's share price may be more volatile and the Fund has a greater potential to realize losses upon the occurrence of adverse events affecting a particular issuer. 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. 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.
Risk Lose Money [Text]	rr_RiskLoseMoney	You may lose money by investing in the Fund.
Risk Nondiversified Status [Text]	rr_RiskNondiversifiedStatus	The Fund is a non-diversified investment company, which means that the Fund may invest more of its assets in a smaller number of issuers than a diversified investment company. As a non-diversified fund, the Fund's share price may be more volatile and the Fund has a greater potential to realize losses upon the occurrence of adverse events affecting a particular issuer.
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	There is no performance information quoted for the Fund as the Fund had not commenced investment operations as of the date of this prospectus.
Performance One Year or Less [Text]	rr_PerformanceOneYearOrLess	There is no performance information quoted for the Fund as the Fund had not commenced investment operations as of the date of this prospectus.
UBS U.S. Small Cap Equity Fund (Prospectus Summary) | UBS U.S. Small Cap Equity Fund | Class A
Risk Return [Abstract]	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_MaximumDeferredSalesChargeOverOfferingPrice	none	[1]
Redemption fee (as a percentage of amount redeemed within 90 days of purchase, if applicable)	rr_RedemptionFeeOverRedemption	(1.00%)
Management fees	rr_ManagementFeesOverAssets	1.00%
Distribution and/or service (12b-1) fees	rr_DistributionAndService12b1FeesOverAssets	0.25%
Other expenses	rr_OtherExpensesOverAssets	0.60%	[2]
Total annual fund operating expenses	rr_ExpensesOverAssets	1.85%
Less management fee waiver/expense reimbursements	rr_FeeWaiverOrReimbursementOverAssets	(0.45%)
Total annual fund operating expenses after management fee waiver/expense reimbursements	rr_NetExpensesOverAssets	1.40%	[3]
Fee Waiver or Reimbursement over Assets, Date of Termination	rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination	2013-10-28
Expense Example, with Redemption, 1 Year	rr_ExpenseExampleYear01	685
Expense Example, with Redemption, 3 Years	rr_ExpenseExampleYear03	1,058
UBS U.S. Small Cap Equity Fund (Prospectus Summary) | UBS U.S. Small Cap Equity Fund | Class C
Risk Return [Abstract]	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	1.00%
Redemption fee (as a percentage of amount redeemed within 90 days of purchase, if applicable)	rr_RedemptionFeeOverRedemption	(1.00%)
Management fees	rr_ManagementFeesOverAssets	1.00%
Distribution and/or service (12b-1) fees	rr_DistributionAndService12b1FeesOverAssets	1.00%
Other expenses	rr_OtherExpensesOverAssets	0.60%	[2]
Total annual fund operating expenses	rr_ExpensesOverAssets	2.60%
Less management fee waiver/expense reimbursements	rr_FeeWaiverOrReimbursementOverAssets	(0.45%)
Total annual fund operating expenses after management fee waiver/expense reimbursements	rr_NetExpensesOverAssets	2.15%	[3]
Fee Waiver or Reimbursement over Assets, Date of Termination	rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination	2013-10-28
Expense Example, with Redemption, 1 Year	rr_ExpenseExampleYear01	318
Expense Example, with Redemption, 3 Years	rr_ExpenseExampleYear03	766
Expense Example, No Redemption, 1 Year	rr_ExpenseExampleNoRedemptionYear01	218
Expense Example, No Redemption, 3 Years	rr_ExpenseExampleNoRedemptionYear03	766
UBS U.S. Small Cap Equity Fund (Prospectus Summary) | UBS U.S. Small Cap Equity Fund | Class Y
Risk Return [Abstract]	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 percentage of amount redeemed within 90 days of purchase, if applicable)	rr_RedemptionFeeOverRedemption	(1.00%)
Management fees	rr_ManagementFeesOverAssets	1.00%
Distribution and/or service (12b-1) fees	rr_DistributionAndService12b1FeesOverAssets	none
Other expenses	rr_OtherExpensesOverAssets	0.60%	[2]
Total annual fund operating expenses	rr_ExpensesOverAssets	1.60%
Less management fee waiver/expense reimbursements	rr_FeeWaiverOrReimbursementOverAssets	(0.45%)
Total annual fund operating expenses after management fee waiver/expense reimbursements	rr_NetExpensesOverAssets	1.15%	[3]
Fee Waiver or Reimbursement over Assets, Date of Termination	rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination	2013-10-28
Expense Example, with Redemption, 1 Year	rr_ExpenseExampleYear01	117
Expense Example, with Redemption, 3 Years	rr_ExpenseExampleYear03	461

[1] 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.

[2] "Other expenses" are based on estimates for the current fiscal year.

[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 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 28, 2013, do not exceed 1.40% for Class A 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. 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, the UBS Global AM (Americas)'s three year recoupment rights will survive.

XML

UBS Multi-Asset Income Fund (Prospectus Summary) | UBS Multi-Asset Income Fund

UBS Multi-Asset Income Fund

Investment objective

The Fund seeks to provide risk-managed income as its primary objective over the
long term.

Fees and expenses

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 $100,000 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 43 of the Fund's
prospectus and in "Reduced sales charges, additional purchase, exchange and
redemption information and other services" on page 107 of the Fund's statement
of additional information ("SAI").

Shareholder fees (fees paid directly from your investment)

Shareholder Fees UBS Multi-Asset Income Fund	Class A		Class C	Class Y
Maximum front-end sales charge (load) imposed on purchases (as a % of offering price)	4.50%		none	none
Maximum contingent deferred sales charge (load) (CDSC) (as a % of purchase or sales price, whichever is less)	none	[1]	0.75%	none
Redemption fee (as a % of amount redeemed within 90 days of purchase, if applicable)	1.00%		1.00%	1.00%

Annual fund operating expenses (expenses that you pay each year as a percentage of the value of your investment)

Annual Fund Operating Expenses UBS Multi-Asset Income Fund		Class A	Class C	Class Y
Management fees		0.59%	0.59%	0.59%
Distribution and/or service (12b-1) fees		0.25%	1.00%	none
Other expenses	[1]	2.13%	2.22%	2.14%
Acquired fund fees and expenses	[1][2]	0.33%	0.33%	0.33%
Total annual fund operating expenses	[2]	3.30%	4.14%	3.06%
Less management fee waiver/expense reimbursements		2.02%	2.11%	2.03%
Total annual fund operating expenses after management fee waiver/expense reimbursements	[2][3]	1.28%	2.03%	1.03%

Example

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:

Expense Example UBS Multi-Asset Income Fund (USD $)	Expense Example, with Redemption, 1 Year	Expense Example, with Redemption, 3 Years
Class A	575	1,239
Class C	281	1,066
Class Y	105	754

Expense Example, No Redemption (USD $)	Expense Example, No Redemption, 1 Year	Expense Example, No Redemption, 3 Years
UBS Multi-Asset Income Fund Class C	206	1,066

Portfolio turnover

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.
For the period April 25, 2012 through June 30, 2012, the Fund's portfolio
turnover rate was 17% of the average value of its portfolio.

Principal strategies

Principal investments

Under normal circumstances, the Fund seeks to provide risk-managed income on a
monthly basis by employing an asset allocation strategy that is designed to
accommodate the Fund's targeted annual payout percentage. The Fund will allocate
its assets by investing in a combination of equities, nominal and
inflation-linked fixed income securities, third party exchange-traded funds
("ETFs"), real estate investment trusts ("REITs"), exchange-listed options, and
other exchange-traded and over-the-counter ("OTC") derivative securities.

The Fund may obtain exposure to fixed income investments by investing in
securities directly or by purchasing third-party ETFs that invest in fixed
income securities. The Fund's fixed income investments may include debt
securities of governments throughout the world (including the United States),
their agencies and instrumentalities, debt securities of corporations (including
inflation-linked notes and catastrophe bonds), floating rate notes,
mortgage-backed securities and asset-backed securities. Catastrophe bonds are
types of insurance-linked or event-linked securities that pay off on the occurrence
of specific events, usually natural disasters. The third-party ETFs in which the
Fund invests could have exposure to senior bank loans. These securities may be
either investment grade or high yield (lower-rated or "junk bonds") securities.
The Fund may invest without limitation in investment grade debt securities,
including corporate debt securities and inflation-linked securities, and may
invest up to 50% of its total assets in lower-rated bonds of corporations and
up to 20% of its total assets in a combination of other lower-rated bonds,
including lower-rated municipal bonds and lower-rated non-US government bonds
(including those of emerging markets countries). The Fund may invest in fixed
income investments of any maturity.

The Fund may obtain exposure to equity investments by investing in securities
directly or by purchasing third-party ETFs that invest in equity securities. The
Fund may invest up to 50% of its total assets either directly or through
investment in ETFs in the common stock and preferred stock of companies in
developed countries (including the United States). In addition, the Fund may
invest up to 25% of its total assets in real estate securities of US and non-US
issuers. Real estate securities may include interests in REITs that own
properties or make construction or mortgage loans, securities of companies with
substantial real estate holdings and other companies whose products and services
are related to the real estate industry, such as building supply manufacturers,
mortgage lenders, or mortgage service companies. The Fund's equity investments
may include companies and REITs of any market capitalization, including small
capitalization (below $3 billion). Within these limitations, the Fund may invest
up to 15% of its assets in infrastructure securities and up to 20% of its assets
in equity securities of emerging markets issuers.

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 Fund may invest in structured notes in order to
generate income for the Fund. The Fund also may write covered call options on
ETFs to generate cash flow for the purpose of meeting the Fund's target payment
goal, as well as for hedging purposes. Other derivatives in which the Fund may
invest include index options, futures, forward agreements and swap agreements
(specifically, interest rate, currency and total return swaps). All of these
derivatives may be used for risk management purposes, such as hedging against a
specific security or currency, or to manage or adjust the risk profile of the
Fund. In addition, all of the derivative instruments listed above may be used
for investment (non-hedging) purposes to earn income; to enhance returns; to
replace more traditional direct investments; to obtain exposure to certain
markets; or to establish net short positions for individual markets, currencies
or securities. Futures on indices, forward agreements and interest rate swaps
may also be used to adjust the Fund's portfolio duration.

Management process

The Fund seeks to provide diversification across a variety of income producing
asset classes in a multi-asset framework. The Fund's asset allocation strategy
is designed to accommodate the Fund's targeted annual payout while taking into
account the Fund's desired level of capital appreciation. Risk diversification
and dynamic distribution between the various asset classes have the objective of
creating a more stable capital and income base through various market cycles and
interest rate environments. The allocation of investments across asset classes
will vary over time and will be driven by:

• Valuation based on the Advisor's 30 year fundamental value philosophy;

• Economic factors including the current and projected interest rate environment
and credit conditions; and

• A focus on diversification and risk-management to meet the Fund's payout
objective while managing volatility.

Under normal or neutral market conditions, the Advisor will allocate
approximately 65% of the Fund's total assets to fixed income investments, 20% of
the Fund's assets to equity investments of companies in developed (including the
United States) or emerging markets countries and 15% of the Fund's assets to US
and non-US real estate securities (including REITs). The Fund's asset allocation
targets are not fixed which gives the Advisor the flexibility to meet the Fund's
investment goal based on market conditions. If warranted by market conditions,
the Advisor may invest 100% of the Fund's assets in fixed income investments. In
addition, the Fund's allocations to US and non-US equity and real estate
securities may be greater or lesser than the allocations described above based
on the Advisor's assessment of the markets.

The Fund's investment strategy is designed to attempt to achieve a targeted
annual payout to investors of 3%-6% based on the current low interest rate
environment. By investing in a diversified set of income generating asset
classes the Fund seeks to accommodate the Fund's targeted annual payout
percentage while managing both capital volatility and yield volatility. Such
payout may be comprised of both ordinary income and capital gains. Neither the
Fund nor the Advisor represents or guarantees that the Fund will meet this
annual payout goal. The Fund intends to make monthly income distribution to
shareholders. The amount of monthly distributions may vary from month to month
and there is no guarantee that the Fund will be able to make such payments each
month.

Main risks

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.

Asset allocation risk: The risk that the Fund may allocate assets to an asset
category that performs poorly relative to other asset categories.

Market risk: The risk that 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.

Interest rate risk: An increase in prevailing interest rates typically causes
the value of fixed income securities to fall. Changes in interest rates will
likely affect the value of longer-duration fixed income securities more than
shorter-duration securities and higher quality securities more than lower
quality securities. When interest rates are falling, some fixed income
securities provide that the issuer may repay them earlier than the maturity
date, and if this occurs the Fund may have to reinvest these repayments at lower
interest rates.

Credit risk: The risk that the Fund could lose money if the issuer or guarantor
of a fixed income security, or the counterparty to or guarantor of a derivative
contract, is unable or unwilling to meet its financial obligations. This risk is
likely greater for lower quality investments than for investments that are
higher quality.

High yield bond risk: The risk that the issuer of bonds with ratings of BB
(Standard & Poor's Ratings Group ("S&P")) or Ba (Moody's Investors Service, Inc.
("Moody's")) or below, or deemed of equivalent quality, will default or
otherwise be unable to honor a financial obligation (also known as lower-rated
or "junk bonds"). These securities are considered to be predominately
speculative with respect to an issuer's capacity to pay interest and repay
principal in accordance with the terms of the obligations. Lower-quality bonds
are more likely to be subject to an issuer's default or downgrade than
investment grade (higher-quality) bonds.

Distribution of income risk: The Fund's monthly income payments will be made
from the Fund's interest income, dividends, and currency allocations and will
reduce the amount of assets available for investment by the Fund. The Fund's
investment losses may reduce the amount of future distributions an investor will
receive from the Fund thereby reducing the distribution yield. The dollar amount
of the Fund's monthly income payments could vary substantially from one year to
the next and over time depending on several factors, including the performance
of the financial markets in which the Fund invests, the allocation of Fund
assets across different asset classes and investments, the performance of the
Fund's underlying strategies, and the amount and timing of prior distributions
by the Fund. It is also possible for payments to go down substantially or
significantly fluctuate from one year to the next, month over month, and over
time depending on the timing of an investor's investments in the Fund. Any
redemptions will proportionately reduce the amount of future cash income
payments to be received from the Fund. There is no guarantee that the Fund will
make monthly income payments to its shareholders or, if made, that the Fund's
monthly income payments to shareholders will remain at a fixed amount.

Investing in ETFs risks: The Fund's investment in ETFs may subject the Fund to
additional risks than if the Fund would have invested directly in the ETF's
underlying securities. These risks include the possibility that an ETF may
experience a lack of liquidity that can result in greater volatility than its
underlying securities; an ETF may trade at a premium or discount to its net
asset value; or an ETF may not replicate exactly the performance of the
benchmark index it seeks to track. In addition, investing in an ETF may also be
more costly than if a Fund had owned the underlying securities directly. The
Fund, and indirectly, shareholders of the Fund, bear a proportionate share of
the ETF's expenses, which include management and advisory fees and other
expenses. In addition, the Fund will pay brokerage commissions in connection
with the purchase and sale of shares of ETFs.

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.

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.
Investments in foreign government bonds involve special risks because the Fund may
have limited legal recourse in the event of default. Also, foreign securities are
sometimes less liquid and more difficult to sell and to value than securities of
US issuers. These risks are greater for investments in emerging market issuers.
In addition, investments in emerging market issuers may decline in value because
of unfavorable foreign government actions, greater risks of political
instability or the absence of accurate information about emerging market
issuers.

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.

Real estate securities and REITs: The risk that the Fund's performance will be
affected by adverse developments in the real estate industry. Real estate values
may be affected by a variety of factors, including: local, national or global
economic conditions; changes in zoning or other property-related laws;
environmental regulations; interest rates; tax and insurance considerations;
overbuilding; property taxes and operating expenses; or declining values in a
neighborhood. Similarly, a REIT's performance depends on the types, values,
locations and management of the properties it owns. In addition, a REIT may be
more susceptible to adverse developments affecting a single project or market
segment than a more diversified investment. Loss of status as a qualified REIT
under the US federal tax laws could adversely affect the value of a particular
REIT or the market for REITs as a whole.

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. Derivatives relating to fixed income
markets are especially susceptible to interest rate risk and credit risk. In
addition, many types of swaps and other 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.

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

Performance

There is no performance information quoted for the Fund as the Fund had not
completed a full calendar year of operations as of the date of this prospectus.

[1] 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.

[1] "Other expenses" and "Acquired fund fees and expenses" are based on annualized amounts for the Fund's fiscal year ended June 30, 2012.

[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, and 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, and dividend expense and security loan fees for securities sold short), through the period ending October 28, 2013, do not exceed 0.95% for Class A shares, 1.70% for Class C shares and 0.70% 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. 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, the UBS Global AM (Americas)'s three year recoupment rights will survive.

XML

UBS Global Allocation Fund (Prospectus Summary) | UBS Global Allocation Fund

UBS Global Allocation Fund

Investment objective

The Fund seeks to maximize total return, consisting of capital appreciation and
current income.

Fees and expenses

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 43 of the Fund's
prospectus and in "Reduced sales charges, additional purchase, exchange and
redemption information and other services" on page 107 of the Fund's statement
of additional information ("SAI").

Shareholder fees (fees paid directly from your investment)

Shareholder Fees UBS Global Allocation Fund	Class A		Class C	Class Y
Maximum front-end sales charge (load) imposed on purchases (as a % of offering price)	5.50%		none	none
Maximum contingent deferred sales charge (load) (CDSC) (as a % of purchase or sales price, whichever is less)	none	[1]	1.00%	none
Redemption fee (as a % of amount redeemed within 90 days of purchase, if applicable)	1.00%		1.00%	1.00%

Annual fund operating expenses (expenses that you pay each year as a percentage of the value of your investment)

Annual Fund Operating Expenses UBS Global Allocation Fund		Class A	Class C	Class Y
Management fees		0.77%	0.77%	0.77%
Distribution and/or service (12b-1) fees		0.25%	1.00%	none
Other expenses		0.23%	0.25%	0.18%
Acquired fund fees and expenses		0.06%	0.06%	0.06%
Total annual fund operating expenses	[1]	1.31%	2.08%	1.01%

Example

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. Although your actual costs may be higher or
lower, based on these assumptions, your costs would be:

Expense Example UBS Global Allocation Fund (USD $)	Expense Example, with Redemption, 1 Year	Expense Example, with Redemption, 3 Years	Expense Example, with Redemption, 5 Years	Expense Example, with Redemption, 10 Years
Class A	676	942	1,229	2,042
Class C	311	652	1,119	2,410
Class Y	103	322	558	1,236

Expense Example, No Redemption (USD $)	Expense Example, No Redemption, 1 Year	Expense Example, No Redemption, 3 Years	Expense Example, No Redemption, 5 Years	Expense Example, No Redemption, 10 Years
UBS Global Allocation Fund Class C	211	652	1,119	2,410

Portfolio turnover

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 93% of
the average value of its portfolio.

Principal strategies

Principal investments

The Fund invests in equity and fixed income securities of issuers located within
and outside the United States. Under normal circumstances, the Fund allocates
its assets between fixed income securities and equity securities, including
securities of issuers in both developed (including the United States) and
emerging markets countries. Investments in fixed income securities may include,
but are not limited to, debt securities of governments throughout the world
(including the United States), their agencies and instrumentalities, debt
securities of corporations, mortgage-backed securities and asset-backed
securities. These securities will have an initial maturity of more than one year
and may be either investment grade or high yield (lower-rated or "junk bonds")
securities. Investments in equity securities may include, but are not limited
to, common stock and preferred stock. The Fund may invest in other open-end
investment companies advised by the Advisor to gain exposure to certain asset
classes.

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
index options, futures, forward agreements, swap agreements (specifically,
interest rate, credit default and inflation swaps), equity participation notes
and equity linked notes. All of these derivatives may be used for risk
management purposes, such as hedging against a specific security or currency
(except with respect to equity participation notes and equity linked notes), or
to manage or adjust the risk profile of the Fund. In addition, all of the
derivative instruments listed above may be used for investment (non-hedging)
purposes to earn income; to enhance returns; to replace more traditional direct
investments; to obtain exposure to certain markets; or to establish net short
positions for individual markets, currencies or securities. Futures on indices,
forward agreements, interest rate swaps and credit default swaps may also be
used to adjust the Fund's portfolio duration.

Management process

The Fund is a multi-asset fund. Asset allocation decisions are tactical, based
upon the Advisor's assessment of valuations and prevailing market conditions in
the United States and abroad. In determining the asset allocation of the Fund,
the Advisor may utilize fundamental valuation and market behavior indicators to
construct the Fund's portfolio.

With respect to the Advisor's selection of specific equity securities for
inclusion in the Fund's equity asset classes, the Advisor may utilize
fundamental valuation and growth-oriented strategies.

In selecting equity securities for the Fund using the fundamental valuation
process, the Advisor selects securities whose fundamental values (the Advisor's
assessment of what a security is worth) it believes are greater than what is
reflected in market prices. A stock with a market price below its assessed
fundamental value would be considered for inclusion in the Fund's portfolio.

Under certain circumstances the Advisor also may utilize a growth-oriented
strategy within its equity asset classes. In selecting growth equities, the
Advisor seeks to invest in companies that possess a dominant market position and
franchise, a major technological edge or a unique competitive advantage.

The Advisor's fixed income strategy combines judgments about the absolute value
of the fixed income universe and the relative value of issuer sectors, maturity
intervals, security durations, credit qualities and coupon segments, as well as
specific circumstances facing the issuers of fixed income securities.

The Fund's risk is carefully monitored with consideration given to the risk
generated by individual position, sector, country and currency views.

Main risks

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.

Interest rate risk: An increase in prevailing interest rates typically causes
the value of fixed income securities to fall. Changes in interest rates will
likely affect the value of longer-duration fixed income securities more than
shorter-duration securities and higher quality securities more than lower
quality securities. When interest rates are falling, some fixed income
securities provide that the issuer may repay them earlier than the maturity
date, and if this occurs the Fund may have to reinvest these repayments at lower
interest rates.
  
Government securities risk: There are different types of US government
securities with different levels of credit risk, including 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.

Credit risk: The risk that the Fund could lose money if the issuer or guarantor
of a fixed income security, or the counterparty to or guarantor of a derivative
contract, is unable or unwilling to meet its financial obligations. This risk is
likely greater for lower quality investments than for investments that are
higher quality.

High yield bond risk: The risk that the issuer of bonds with ratings of BB
(Standard & Poor's Ratings Group ("S&P")) or Ba (Moody's Investors Service, Inc.
("Moody's")) or below, or deemed of equivalent quality, will default or
otherwise be unable to honor a financial obligation (also known as lower-rated
or "junk bonds"). These securities are considered to be predominately
speculative with respect to an issuer's capacity to pay interest and repay
principal in accordance with the terms of the obligations. Lower-quality bonds
are more likely to be subject to an issuer's default or downgrade than
investment grade (higher-quality) bonds.

Market risk: The risk that 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.

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. Investments in foreign government bonds involve special risks because
the Fund may have limited legal recourse in the event of default. Also, foreign
securities are sometimes less liquid and more difficult to sell and to value
than securities of US issuers. These risks are greater for investments in emerging
market issuers. In addition, investments in emerging market issuers may decline
in value because of unfavorable foreign government actions, greater risks of
political instability or the absence of accurate information about emerging
market issuers.

Asset allocation risk: The risk that the Fund may allocate assets to an asset
category that performs poorly relative to other asset categories.

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. Derivatives relating to fixed income
markets are especially susceptible to interest rate risk and credit risk. In
addition, many types of swaps and other 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.

Investing in other funds risks: The Fund's investment performance is affected by
the investment performance of the underlying funds in which the Fund may invest.
Through its investment in the underlying funds, the Fund is subject to the risks
of the underlying funds' investments and subject to the underlying funds'
expenses.

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

Performance

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. The MSCI World Free Index (net) shows how the Fund's
performance compares to an index that is designed to measure the equity market
performance of developed markets. The Citigroup World Government Bond Index
shows how the Fund's performance compares to an index composed of straight
(i.e., not floating rate or index-linked) government bonds with a one-year
minimum maturity. The GSMI Mutual Fund Index shows how the Fund's performance
compares to an index compiled by the Advisor that is constructed as follows:
65% MSCI All Country World Index (net), 15% Citigroup World Government Bond ex
US Index, 15% Citigroup US Government Bond Index, 2% J.P. Morgan Emerging
Markets Bond Index Global (EMBI Global) and 3% BofA Merrill Lynch US High
Yield Cash Pay Constrained Index. Indices reflect no deduction for fees,
expenses or taxes, except for the MSCI World Free Index (net) which reflects
no deduction for fees and expenses. 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.

UBS Global Allocation Fund Annual Total Returns of Class Y Shares

Total return January 1 - September 30, 2012: 9.61%
Best quarter during calendar years shown-2Q 2009: 23.56%
Worst quarter during calendar years shown-4Q 2008: (21.44)%

Average annual total returns (for the periods ended December 31, 2011)

Average Annual Total Returns UBS Global Allocation Fund	Label		1 Year	5 Years	10 Years	Inception Date
Class A	Class A Return before taxes		(12.77%)	(2.44%)	4.17%	Jun. 30, 1997
Class C	Class C Return before taxes	[1]	(9.17%)	(2.09%)	3.94%	Nov. 22, 2001
Class Y	Class Y Return before taxes		(7.37%)	(1.05%)	5.02%	Aug. 31, 1992
Class Y After Taxes on Distributions	Class Y Return after taxes on distributions		(8.66%)	(3.08%)	3.36%	Aug. 31, 1992
Class Y After Taxes on Distributions and Sales	Class Y Return after taxes on distributions and sale of fund shares		(4.47%)	(1.81%)	3.62%	Aug. 31, 1992
Russell 3000 Index	Russell 3000 Index		1.03%	(0.01%)	3.52%
MSCI World Free Index (net)	MSCI World Free Index (net)		(5.54%)	(2.37%)	3.62%
Citigroup World Government Bond Index	Citigroup World Government Bond Index		6.35%	7.13%	7.77%
GSMI Mutual Fund Index	GSMI Mutual Fund Index		(2.14%)	1.56%	5.62%

[1] 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.

[1] 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" will differ from those presented in the Financial highlights.

[1] 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 annual average returns presented for the Class C shares shown above.

XML

Label	Element	Value
Risk Return [Abstract]	rr_RiskReturnAbstract
ProspectusDate	rr_ProspectusDate	Oct. 29, 2012
UBS Global Equity Fund (Prospectus Summary) | UBS Global Equity Fund
Risk Return [Abstract]	rr_RiskReturnAbstract
Risk/Return [Heading]	rr_RiskReturnHeading	UBS Global 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 17 of the Fund's prospectus and in "Reduced sales charges, additional purchase, exchange and redemption information and other services" on page 74 of the Fund's statement of additional information ("SAI").
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)
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 77% of the average value of its portfolio.
Portfolio Turnover, Rate	rr_PortfolioTurnoverRate	77.00%
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 Under normal circumstances, the Fund invests at least 80% of its net assets (plus borrowings for investment purposes, if any) in equity securities. Investments in equity securities may include, but are not limited to, dividend-paying securities, common stock and preferred stock of US and foreign issuers. The Fund may invest in issuers from both developed and emerging markets. The Advisor, on behalf of the Fund, intends to diversify broadly among countries, but reserves the right to invest a substantial portion of the Fund's assets in one or more countries if economic and business conditions warrant such investments. The Fund may invest in stocks of companies of any size. 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, forward currency agreements and equity participation notes. All of 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, all of the derivative instruments listed above may be used for investment (non-hedging) purposes to earn income; to enhance returns; to replace more traditional direct investments (except for forward currency agreements); to obtain exposure to certain markets; or to establish net short positions for individual currencies (except for equity participation notes). Management process In the global universe, the Advisor uses a disciplined price to intrinsic value approach that seeks to take advantage of pricing anomalies in markets. 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 country, 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 across industries and countries with attractive relative price/value characteristics.
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. 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. These risks are greater for investments in emerging market issuers. In addition, investments in emerging market issuers may decline in value because of unfavorable foreign government actions, greater risks of political instability or the absence of accurate information about emerging market issuers. Management risk: The risk that the investment strategies, techniques and risk analyses employed by the Advisor may not produce the desired results. 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. 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.
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. Index reflects no deduction for fees and expenses. 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 Returns [Text]	rr_PerformanceInformationIllustratesVariabilityOfReturns	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.
Performance Availability Website Address [Text]	rr_PerformanceAvailabilityWebSiteAddress	http://globalam-us.ubs.com/corpweb/performance.do
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	UBS Global Equity Fund Annual Total Returns of Class Y Shares
Bar Chart Closing [Text Block]	rr_BarChartClosingTextBlock	Total return January 1 - September 30, 2012: 12.91% Best quarter during calendar years shown-2Q 2009: 26.01% Worst quarter during calendar years shown-4Q 2008: (22.99)%
Index No Deduction for Fees, Expenses, Taxes [Text]	rr_IndexNoDeductionForFeesExpensesTaxes	Index reflects no deduction for fees and expenses.
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	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 Y shares' after-tax returns shown.
Caption	rr_AverageAnnualReturnCaption	Average annual total returns (for the periods ended December 31, 2011)
UBS Global Equity Fund (Prospectus Summary) | UBS Global Equity Fund | MSCI World Free Index (net)
Risk Return [Abstract]	rr_RiskReturnAbstract
Label	rr_AverageAnnualReturnLabel	MSCI World Free Index (net)
1 Year	rr_AverageAnnualReturnYear01	(5.54%)
5 Years	rr_AverageAnnualReturnYear05	(2.37%)
10 Years	rr_AverageAnnualReturnYear10	3.62%
UBS Global Equity Fund (Prospectus Summary) | UBS Global Equity Fund | Class A
Risk Return [Abstract]	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_MaximumDeferredSalesChargeOverOfferingPrice	none	[1]
Redemption fee (as a % of amount redeemed within 90 days of purchase, if applicable)	rr_RedemptionFeeOverRedemption	(1.00%)	[1]
Management fees	rr_ManagementFeesOverAssets	0.75%
Distribution and/or service (12b-1) fees	rr_DistributionAndService12b1FeesOverAssets	0.25%	[1]
Other expenses	rr_OtherExpensesOverAssets	0.61%	[2]
Total annual fund operating expenses	rr_ExpensesOverAssets	1.61%
Less management fee waiver/expense reimbursements	rr_FeeWaiverOrReimbursementOverAssets	(0.11%)
Total annual fund operating expenses after management fee waiver/expense reimbursements	rr_NetExpensesOverAssets	1.50%	[3]
Fee Waiver or Reimbursement over Assets, Date of Termination	rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination	2013-10-28
Expense Example, with Redemption, 1 Year	rr_ExpenseExampleYear01	694
Expense Example, with Redemption, 3 Years	rr_ExpenseExampleYear03	1,020
Expense Example, with Redemption, 5 Years	rr_ExpenseExampleYear05	1,368
Expense Example, with Redemption, 10 Years	rr_ExpenseExampleYear10	2,347
Label	rr_AverageAnnualReturnLabel	Class A Return before taxes
1 Year	rr_AverageAnnualReturnYear01	(16.92%)
5 Years	rr_AverageAnnualReturnYear05	(4.12%)
10 Years	rr_AverageAnnualReturnYear10	2.34%
Inception Date	rr_AverageAnnualReturnInceptionDate	Jun. 30, 1997
UBS Global Equity Fund (Prospectus Summary) | UBS Global Equity Fund | Class C
Risk Return [Abstract]	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	1.00%	[1]
Redemption fee (as a % of amount redeemed within 90 days of purchase, if applicable)	rr_RedemptionFeeOverRedemption	(1.00%)	[1]
Management fees	rr_ManagementFeesOverAssets	0.75%
Distribution and/or service (12b-1) fees	rr_DistributionAndService12b1FeesOverAssets	1.00%	[1]
Other expenses	rr_OtherExpensesOverAssets	0.65%	[2]
Total annual fund operating expenses	rr_ExpensesOverAssets	2.40%
Less management fee waiver/expense reimbursements	rr_FeeWaiverOrReimbursementOverAssets	(0.15%)
Total annual fund operating expenses after management fee waiver/expense reimbursements	rr_NetExpensesOverAssets	2.25%	[1],[3]
Fee Waiver or Reimbursement over Assets, Date of Termination	rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination	2013-10-28
Expense Example, with Redemption, 1 Year	rr_ExpenseExampleYear01	328
Expense Example, with Redemption, 3 Years	rr_ExpenseExampleYear03	734
Expense Example, with Redemption, 5 Years	rr_ExpenseExampleYear05	1,267
Expense Example, with Redemption, 10 Years	rr_ExpenseExampleYear10	2,725
Expense Example, No Redemption, 1 Year	rr_ExpenseExampleNoRedemptionYear01	228
Expense Example, No Redemption, 3 Years	rr_ExpenseExampleNoRedemptionYear03	734
Expense Example, No Redemption, 5 Years	rr_ExpenseExampleNoRedemptionYear05	1,267
Expense Example, No Redemption, 10 Years	rr_ExpenseExampleNoRedemptionYear10	2,725
Label	rr_AverageAnnualReturnLabel	Class C Return before taxes	[4]
1 Year	rr_AverageAnnualReturnYear01	(13.61%)
5 Years	rr_AverageAnnualReturnYear05	(3.76%)
10 Years	rr_AverageAnnualReturnYear10	2.15%
Inception Date	rr_AverageAnnualReturnInceptionDate	Nov. 27, 2001
UBS Global Equity Fund (Prospectus Summary) | UBS Global Equity Fund | Class Y
Risk Return [Abstract]	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	[1]
Redemption fee (as a % of amount redeemed within 90 days of purchase, if applicable)	rr_RedemptionFeeOverRedemption	(1.00%)	[1]
Management fees	rr_ManagementFeesOverAssets	0.75%
Distribution and/or service (12b-1) fees	rr_DistributionAndService12b1FeesOverAssets	none
Other expenses	rr_OtherExpensesOverAssets	0.50%	[2]
Total annual fund operating expenses	rr_ExpensesOverAssets	1.25%
Less management fee waiver/expense reimbursements	rr_FeeWaiverOrReimbursementOverAssets	none
Total annual fund operating expenses after management fee waiver/expense reimbursements	rr_NetExpensesOverAssets	1.25%	[3]
Fee Waiver or Reimbursement over Assets, Date of Termination	rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination	2013-10-28
Expense Example, with Redemption, 1 Year	rr_ExpenseExampleYear01	127
Expense Example, with Redemption, 3 Years	rr_ExpenseExampleYear03	397
Expense Example, with Redemption, 5 Years	rr_ExpenseExampleYear05	686
Expense Example, with Redemption, 10 Years	rr_ExpenseExampleYear10	1,511
Annual Return 2002	rr_AnnualReturn2002	(15.54%)
Annual Return 2003	rr_AnnualReturn2003	29.57%
Annual Return 2004	rr_AnnualReturn2004	14.26%
Annual Return 2005	rr_AnnualReturn2005	7.15%
Annual Return 2006	rr_AnnualReturn2006	17.76%
Annual Return 2007	rr_AnnualReturn2007	3.71%
Annual Return 2008	rr_AnnualReturn2008	(40.69%)
Annual Return 2009	rr_AnnualReturn2009	45.37%
Annual Return 2010	rr_AnnualReturn2010	10.61%
Annual Return 2011	rr_AnnualReturn2011	(11.84%)
Year to Date Return, Label	rr_YearToDateReturnLabel	Total return January 1 - September 30, 2012:
Bar Chart, Year to Date Return, Date	rr_BarChartYearToDateReturnDate	Sep. 30, 2012
Bar Chart, Year to Date Return	rr_BarChartYearToDateReturn	12.91%
Highest Quarterly Return, Label	rr_HighestQuarterlyReturnLabel	Best quarter during calendar years shown-2Q 2009:
Highest Quarterly Return, Date	rr_BarChartHighestQuarterlyReturnDate	Jun. 30, 2009
Highest Quarterly Return	rr_BarChartHighestQuarterlyReturn	26.01%
Lowest Quarterly Return, Label	rr_LowestQuarterlyReturnLabel	Worst quarter during calendar years shown-4Q 2008:
Lowest Quarterly Return, Date	rr_BarChartLowestQuarterlyReturnDate	Dec. 31, 2008
Lowest Quarterly Return	rr_BarChartLowestQuarterlyReturn	(22.99%)
Label	rr_AverageAnnualReturnLabel	Class Y Return before taxes
1 Year	rr_AverageAnnualReturnYear01	(11.84%)
5 Years	rr_AverageAnnualReturnYear05	(2.70%)
10 Years	rr_AverageAnnualReturnYear10	3.24%
Inception Date	rr_AverageAnnualReturnInceptionDate	Jan. 28, 1994
UBS Global Equity Fund (Prospectus Summary) | UBS Global Equity Fund | Class Y | After Taxes on Distributions
Risk Return [Abstract]	rr_RiskReturnAbstract
Label	rr_AverageAnnualReturnLabel	Class Y Return after taxes on distributions
1 Year	rr_AverageAnnualReturnYear01	(11.72%)
5 Years	rr_AverageAnnualReturnYear05	(3.22%)
10 Years	rr_AverageAnnualReturnYear10	2.81%
Inception Date	rr_AverageAnnualReturnInceptionDate	Jan. 28, 1994
UBS Global Equity Fund (Prospectus Summary) | UBS Global Equity Fund | Class Y | After Taxes on Distributions and Sales
Risk Return [Abstract]	rr_RiskReturnAbstract
Label	rr_AverageAnnualReturnLabel	Class Y Return after taxes on distributions and sale of fund shares
1 Year	rr_AverageAnnualReturnYear01	(7.42%)
5 Years	rr_AverageAnnualReturnYear05	(2.46%)
10 Years	rr_AverageAnnualReturnYear10	2.63%
Inception Date	rr_AverageAnnualReturnInceptionDate	Jan. 28, 1994

[1] In connection with the proposed Reorganization of the Fund into the Nationwide Global Equity Fund series of Nationwide Mutual Funds, effective as of the close of business on July 16, 2012, the Fund's Board of Trustees approved the waiver of the annual Rule 12b-1 distribution fee of 0.75% of average net assets that is charged to the shareholders of Class C shares of the Fund. In addition, the Fund has voluntarily lowered the expense limit applicable to Class C shares to 1.50% to reflect the waiver of this Rule 12b-1 distribution fee. The annual service fee of 0.25% of average net assets that is charged on Class A and Class C shares of the Fund was not eliminated. The Board of Trustees also approved the waiver of the 1.00% redemption fee that is charged on sales or exchanges of any Class of shares of the Fund less than 90 days after purchase and the elimination of all contingent deferred sales charges (CDSC) assessed on redemptions that are charged on Class A shares (on purchases above $1 million) and Class C shares. With respect to exchanges of shares of the Fund for shares of another UBS Family Fund, the length of time you held your shares of the UBS Fund will still be considered when determining whether you must pay a CDSC when you sell the shares of the UBS Family Fund acquired in the exchange. These changes are not reflected in the fee and expense tables above or the expense example below.

[2] "Other expenses" include "Acquired fund fees and expenses," which were less than 0.01% of the average net assets of the Fund.

[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 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 28, 2013, do not exceed 1.50% for Class A shares, 2.25% for Class C shares and 1.25% 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. 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, the UBS Global AM (Americas)'s three year recoupment rights will survive.

[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.

XML

UBS Emerging Markets Equity Fund (Prospectus Summary) | UBS Emerging Markets Equity Fund

UBS Emerging Markets Equity Fund

Investment objective

The Fund seeks to maximize capital appreciation.

Fees and expenses

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 20 of the Fund's
prospectus and in "Reduced sales charges, additional purchase, exchange and
redemption information and other services" on page 63 of the Fund's statement of
additional information ("SAI").

Shareholder fees (fees paid directly from your investment)

Shareholder Fees UBS Emerging Markets Equity Fund	Class A		Class C	Class Y
Maximum front-end sales charge (load) imposed on purchases (as a % of offering price)	5.50%		none	none
Maximum contingent deferred sales charge (load) (CDSC) (as a % of purchase or sales price, whichever is less)	none	[1]	1.00%	none
Redemption fee (as a percentage of amount redeemed within 90 days of purchase, if applicable)	1.00%		1.00%	1.00%

Annual fund operating expenses (expenses that you pay each year as a percentage of the value of your investment)

Annual Fund Operating Expenses UBS Emerging Markets Equity Fund		Class A	Class C	Class Y
Management fees		1.10%	1.10%	1.10%
Distribution and/or service (12b-1) fees		0.25%	1.00%	none
Other expenses	[1]	0.64%	0.64%	0.64%
Total annual fund operating expenses		1.99%	2.74%	1.74%
Less management fee waiver/expense reimbursements		0.14%	0.14%	0.14%
Total annual fund operating expenses after management fee waiver/expense reimbursements	[2]	1.85%	2.60%	1.60%

Example

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:

Expense Example UBS Emerging Markets Equity Fund (USD $)	Expense Example, with Redemption, 1 Year	Expense Example, with Redemption, 3 Years
Class A	728	1,127
Class C	363	836
Class Y	163	534

Expense Example, No Redemption (USD $)	Expense Example, No Redemption, 1 Year	Expense Example, No Redemption, 3 Years
UBS Emerging Markets Equity Fund Class C	263	836

Portfolio turnover

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.

Principal strategies

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 that are
tied economically to emerging market countries. Investments in equity securities
may include, but are not limited to, dividend-paying securities, common stock
and preferred stock. Securities tied economically to emerging market countries
include securities on which the return is derived from issuers in emerging
market countries, such as equity swap contracts and equity swap index contracts.
The Fund may invest in stocks of companies of any size. The Fund is a
non-diversified fund.

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, forward currency agreements and equity participation notes. All of
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,
all of the derivative instruments listed above may be used for investment
(non-hedging) purposes to earn income; to enhance returns; to replace more
traditional direct investments (except for forward currency agreements); to
obtain exposure to certain markets; or to establish net short positions for
individual currencies (except for equity participation notes).

The Fund intends to invest primarily in a portfolio of equity securities of
issuers located in at least three emerging market countries, which may be
located in Asia, Europe, Latin America, Africa or the Middle East. An emerging
market country is a country defined as an emerging or developing economy by any
of the World Bank, the International Finance Corporation or the United Nations
or its authorities. Additionally, the Fund, for purposes of its investments, may
consider a country included in JP Morgan or MSCI emerging markets indices to be
an emerging market country. The countries included in this definition will
change over time.

Up to 20% of the Fund's net assets may be invested in higher-yielding,
lower-rated fixed income securities ("junk bonds"). The Fund may invest in fixed
income securities of any maturity, but generally invests in securities having an
initial maturity of more than one year. These securities are rated in the lower
rating categories of Moody's and S&P, including securities rated Ba or lower by
Moody's Investors Service, Inc. ("Moody's") and BB or lower by Standard & Poor's
Ratings Group ("S&P"). The Fund may also invest in Eurodollar securities, which
are fixed income securities of a US issuer or a foreign issuer that are issued
outside of the United States. The Fund may also invest in securities of small
capitalization companies.

Management process

The Advisor is a price to intrinsic value investor. Internally generated
research, focused on longer term value drivers at the industry, stock and
country level, is used to estimate fundamental value for stocks, upon which
investment decisions are made. The process does not have an inherent style bias
(e.g., "growth," "value," "large cap" or "small cap").

The Advisor's investment style is singularly focused on investment fundamentals.
The Advisor tries to identify and exploit periodic discrepancies between market
prices and fundamental value.

For each security under analysis, an intrinsic value is estimated based upon
detailed country, industry and company analysis, including visits to the
company, its competitors and suppliers and other independent sources of
information. This intrinsic value estimate is a function of the present value of
the estimated future cash flows. The resulting intrinsic value estimate is then
compared to the company's current market price to ascertain whether a valuation
anomaly exists. A stock with a price below the estimated intrinsic value would
be considered a candidate for inclusion in the Fund's portfolio. This comparison
between price and intrinsic value allows comparison across industries and
countries. The Advisor's investment specialists are organized along sector
lines. Through an intensive process of company visits and interactions with industry
specialists, analysts gain an understanding of both the company and the dynamics of
the company's industry. The goal is to gain a clear understanding of the medium-term
(up to five years) and long-term prospects of the company, and in particular, its
ability to generate earnings.

Main risks

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.

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. Investments in foreign government bonds involve special risks because
the Fund may have limited legal recourse in the event of default. Also, foreign
securities are sometimes less liquid and more difficult to sell and to value
than securities of US issuers. These risks are greater for investments in
emerging market issuers. In addition, investments in emerging market issuers may
decline in value because of unfavorable foreign government actions, greater
risks of political instability or the absence of accurate information about
emerging market issuers.

Geographic concentration risk: The risk that if the Fund has most of its
investments in a single country or region, its portfolio will be more
susceptible to factors adversely affecting issuers located in that country or
region than would a more geographically diverse portfolio of securities.

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

Non-diversification risk: The Fund is a non-diversified investment company,
which means that the Fund may invest more of its assets in a smaller number of
issuers than a diversified investment company. As a non-diversified fund, the
Fund's share price may be more volatile and the Fund has a greater potential to
realize losses upon the occurrence of adverse events affecting a particular
issuer.

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.

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.

Credit risk: The risk that the Fund could lose money if the issuer or guarantor
of a fixed income security, or the counterparty to or guarantor of a derivative
contract, is unable or unwilling to meet its financial obligations. This risk is
likely greater for lower quality investments than for investments that are
higher quality.

High yield bond risk: The risk that the issuer of bonds with ratings of BB (S&P)
or Ba (Moody's) or below, or deemed of equivalent quality, will default or
otherwise be unable to honor a financial obligation (also known as lower-rated
or "junk bonds"). These securities are considered to be predominately
speculative with respect to an issuer's capacity to pay interest and repay
principal in accordance with the terms of the obligations. Lower-quality bonds
are more likely to be subject to an issuer's default or downgrade than
investment grade (higher-quality) bonds.
  
Interest rate risk: An increase in prevailing interest rates typically causes
the value of fixed income securities to fall. Changes in interest rates will
likely affect the value of longer-duration fixed income securities more than
shorter-duration securities and higher quality securities more than lower
quality securities. When interest rates are falling, some fixed income
securities provide that the issuer may repay them earlier than the maturity
date, and if this occurs the Fund may have to reinvest these repayments at lower
interest rates.

Performance

There is no performance information quoted for the Fund as the Fund had not
commenced investment operations as of the date of this prospectus.

[1] 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.

[1] "Other expenses" are based on estimates for the current fiscal year.

[2] 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 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 28, 2013, do not exceed 1.85% for Class A shares, 2.60% for Class C shares and 1.60% 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. 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, the UBS Global AM (Americas)'s three year recoupment rights will survive.

XML

Label	Element	Value
Risk Return [Abstract]	rr_RiskReturnAbstract
ProspectusDate	rr_ProspectusDate	Oct. 29, 2012
UBS Global Bond Fund (Prospectus Summary) | UBS Global Bond Fund
Risk Return [Abstract]	rr_RiskReturnAbstract
Risk/Return [Heading]	rr_RiskReturnHeading	UBS Global Bond 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 $100,000 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 34 of the Fund's prospectus and in "Reduced sales charges, additional purchase, exchange and redemption information and other services" on page 107 of the Fund's statement of additional information ("SAI").
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)
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 59% of the average value of its portfolio.
Portfolio Turnover, Rate	rr_PortfolioTurnoverRate	59.00%
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 $100,000 in the Fund.
Expense Breakpoint, Minimum Investment Required [Amount]	rr_ExpenseBreakpointMinimumInvestmentRequiredAmount	100,000
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 The Fund generally invests at least 65% of its net assets in investment grade global debt securities that may also provide the potential for capital appreciation. Under normal circumstances, the Fund invests at least 80% of its net assets (plus borrowings for investment purposes, if any) in bonds. The Fund is a non-diversified fund. The Fund may invest in all types of fixed income securities of US, foreign and emerging markets issuers. Investments in bonds may include, but are not limited to, debt securities of governments throughout the world (including the United States and emerging markets), their agencies and instrumentalities, debt securities of corporations, mortgage-backed securities and asset-backed securities. The Fund may invest in bonds of any maturity, but generally invests in bonds having an initial maturity of more than one year. In addition, the Fund may invest in high yield (lower-rated or "junk bonds") 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 options (including, but not limited to, options on futures, forwards and swap agreements), futures, forward agreements, swap agreements (specifically, interest rate, total return, currency, credit default and inflation swaps), credit-linked securities and structured investments. All of these derivatives may be used for risk management purposes, such as hedging against a specific security or currency, or to manage or adjust the risk profile of the Fund. In addition, all of the derivative instruments listed above may be used for investment (non-hedging) purposes to earn income; to enhance returns; to replace more traditional direct investments; to obtain exposure to certain markets; to establish net short positions for individual sectors, markets, currencies or securities; or to adjust the Fund's portfolio duration. Management process With respect to the selection of securities to purchase for the Fund, the Advisor's investment style is focused on investment fundamentals. The Advisor believes that investment fundamentals determine and describe future cash flows that define long term investment value. The Advisor tries to identify and exploit periodic discrepancies between market prices and fundamental value. In analyzing these price/value differences the Advisor also takes into account cyclical market drivers which may influence near term dynamics of market prices. In implementing this style, the Advisor purchases securities for the Fund by using active asset allocation strategies across global fixed income markets and active security selection within each market. In deciding which securities to emphasize, the Advisor uses both quantitative and fundamental analysis to identify securities that are under-priced relative to their fundamental value. The valuation of asset classes reflects an integrated, fundamental analysis of global markets. The Advisor emphasizes those fixed income market sectors, and selects for the Fund those securities that appear to be most undervalued relative to their yields and potential risks. The Advisor selects individual securities for investment by using duration, yield curve and sector analysis.
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. Interest rate risk: An increase in prevailing interest rates typically causes the value of fixed income securities to fall. Changes in interest rates will likely affect the value of longer-duration fixed income securities more than shorter-duration securities and higher quality securities more than lower quality securities. When interest rates are falling, some fixed income securities provide that the issuer may repay them earlier than the maturity date, and if this occurs the Fund may have to reinvest these repayments at lower interest rates. 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. 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. Investments in foreign government bonds involve special risks because the Fund may have limited legal recourse in the event of default. Also, foreign securities are sometimes less liquid and more difficult to sell and to value than securities of US issuers. These risks are greater for investments in emerging market issuers. In addition, investments in emerging market issuers may decline in value because of unfavorable foreign government actions, greater risks of political instability or the absence of accurate information about emerging market issuers. Credit risk: The risk that the Fund could lose money if the issuer or guarantor of a fixed income security, or the counterparty to or guarantor of a derivative contract, is unable or unwilling to meet its financial obligations. This risk is likely greater for lower quality investments than for investments that are higher quality. High yield bond risk: The risk that the issuer of bonds with ratings of BB (Standard & Poor's Ratings Group ("S&P")) or Ba (Moody's Investors Service, Inc. ("Moody's")) or below, or deemed of equivalent quality, will default or otherwise be unable to honor a financial obligation (also known as lower-rated or "junk bonds"). These securities are considered to be predominately speculative with respect to an issuer's capacity to pay interest and repay principal in accordance with the terms of the obligations. Lower-quality bonds are more likely to be subject to an issuer's default or downgrade than investment grade (higher-quality) bonds. Market risk: The risk that 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. Non-diversification risk: The Fund is a non-diversified investment company, which means that the Fund may invest more of its assets in a smaller number of issuers than a diversified investment company. As a non-diversified fund, the Fund's share price may be more volatile and the Fund has a greater potential to realize losses upon the occurrence of adverse events affecting a particular issuer. 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. Derivatives relating to fixed income markets are especially susceptible to interest rate risk and credit risk. In addition, many types of swaps and other 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. Management risk: The risk that the investment strategies, techniques and risk analyses employed by the Advisor may not produce the desired results.
Risk Lose Money [Text]	rr_RiskLoseMoney	You may lose money by investing in the Fund.
Risk Nondiversified Status [Text]	rr_RiskNondiversifiedStatus	The Fund is a non-diversified investment company, which means that the Fund may invest more of its assets in a smaller number of issuers than a diversified investment company. As a non-diversified fund, the Fund's share price may be more volatile and the Fund has a greater potential to realize losses upon the occurrence of adverse events affecting a particular issuer.
Risk Not Insured Depository Institution [Text]	rr_RiskNotInsuredDepositoryInstitution	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.
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. 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 Returns [Text]	rr_PerformanceInformationIllustratesVariabilityOfReturns	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.
Performance Availability Website Address [Text]	rr_PerformanceAvailabilityWebSiteAddress	http://globalam-us.ubs.com/corpweb/performance.do
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	UBS Global Bond Fund Annual Total Returns of Class Y Shares
Bar Chart Closing [Text Block]	rr_BarChartClosingTextBlock	Total return January 1 - September 30, 2012: 5.44% Best quarter during calendar years shown-2Q 2002: 12.70% Worst quarter during calendar years shown-1Q 2009: (6.93)%
Index No Deduction for Fees, Expenses, Taxes [Text]	rr_IndexNoDeductionForFeesExpensesTaxes	Index 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	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 Y shares' after-tax returns shown.
Caption	rr_AverageAnnualReturnCaption	Average annual total returns (for the periods ended December 31, 2011)
UBS Global Bond Fund (Prospectus Summary) | UBS Global Bond Fund | Barclays Global Aggregate Index
Risk Return [Abstract]	rr_RiskReturnAbstract
Label	rr_AverageAnnualReturnLabel	Barclays Global Aggregate Index
1 Year	rr_AverageAnnualReturnYear01	5.64%
5 Years	rr_AverageAnnualReturnYear05	6.46%
10 Years	rr_AverageAnnualReturnYear10	7.16%
Since Inception	rr_AverageAnnualReturnSinceInception		[1]
UBS Global Bond Fund (Prospectus Summary) | UBS Global Bond Fund | Class A
Risk Return [Abstract]	rr_RiskReturnAbstract
Maximum front-end sales charge (load) imposed on purchases (as a % of offering price)	rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice	4.50%
Maximum contingent deferred sales charge (load) (CDSC) (as a % of purchase or sales price, whichever is less)	rr_MaximumDeferredSalesChargeOverOfferingPrice	none	[2]
Redemption fee (as a % of amount redeemed within 90 days of purchase, if applicable)	rr_RedemptionFeeOverRedemption	(1.00%)
Management fees	rr_ManagementFeesOverAssets	0.65%
Distribution and/or service (12b-1) fees	rr_DistributionAndService12b1FeesOverAssets	0.25%
Other expenses	rr_OtherExpensesOverAssets	1.73%	[3]
Total annual fund operating expenses	rr_ExpensesOverAssets	2.63%
Less management fee waiver/expense reimbursements	rr_FeeWaiverOrReimbursementOverAssets	(1.48%)
Total annual fund operating expenses after management fee waiver/expense reimbursements	rr_NetExpensesOverAssets	1.15%	[4]
Fee Waiver or Reimbursement over Assets, Date of Termination	rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination	2013-10-28
Expense Example, with Redemption, 1 Year	rr_ExpenseExampleYear01	562
Expense Example, with Redemption, 3 Years	rr_ExpenseExampleYear03	1,096
Expense Example, with Redemption, 5 Years	rr_ExpenseExampleYear05	1,656
Expense Example, with Redemption, 10 Years	rr_ExpenseExampleYear10	3,175
Label	rr_AverageAnnualReturnLabel	Class A Return before taxes
1 Year	rr_AverageAnnualReturnYear01	0.16%
5 Years	rr_AverageAnnualReturnYear05	1.03%
10 Years	rr_AverageAnnualReturnYear10	4.50%
Since Inception	rr_AverageAnnualReturnSinceInception	4.05%
Inception Date	rr_AverageAnnualReturnInceptionDate	Nov. 05, 2001
UBS Global Bond Fund (Prospectus Summary) | UBS Global Bond Fund | Class C
Risk Return [Abstract]	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	0.75%
Redemption fee (as a % of amount redeemed within 90 days of purchase, if applicable)	rr_RedemptionFeeOverRedemption	(1.00%)
Management fees	rr_ManagementFeesOverAssets	0.65%
Distribution and/or service (12b-1) fees	rr_DistributionAndService12b1FeesOverAssets	0.75%
Other expenses	rr_OtherExpensesOverAssets	1.70%	[3]
Total annual fund operating expenses	rr_ExpensesOverAssets	3.10%
Less management fee waiver/expense reimbursements	rr_FeeWaiverOrReimbursementOverAssets	(1.45%)
Total annual fund operating expenses after management fee waiver/expense reimbursements	rr_NetExpensesOverAssets	1.65%	[4]
Fee Waiver or Reimbursement over Assets, Date of Termination	rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination	2013-10-28
Expense Example, with Redemption, 1 Year	rr_ExpenseExampleYear01	243
Expense Example, with Redemption, 3 Years	rr_ExpenseExampleYear03	821
Expense Example, with Redemption, 5 Years	rr_ExpenseExampleYear05	1,499
Expense Example, with Redemption, 10 Years	rr_ExpenseExampleYear10	3,310
Expense Example, No Redemption, 1 Year	rr_ExpenseExampleNoRedemptionYear01	168
Expense Example, No Redemption, 3 Years	rr_ExpenseExampleNoRedemptionYear03	821
Expense Example, No Redemption, 5 Years	rr_ExpenseExampleNoRedemptionYear05	1,499
Expense Example, No Redemption, 10 Years	rr_ExpenseExampleNoRedemptionYear10	3,310
Label	rr_AverageAnnualReturnLabel	Class C Return before taxes	[5]
1 Year	rr_AverageAnnualReturnYear01	3.69%
5 Years	rr_AverageAnnualReturnYear05	1.43%
10 Years	rr_AverageAnnualReturnYear10
Since Inception	rr_AverageAnnualReturnSinceInception	3.56%
Inception Date	rr_AverageAnnualReturnInceptionDate	Jul. 02, 2002
UBS Global Bond Fund (Prospectus Summary) | UBS Global Bond Fund | Class Y
Risk Return [Abstract]	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 fees	rr_ManagementFeesOverAssets	0.65%
Distribution and/or service (12b-1) fees	rr_DistributionAndService12b1FeesOverAssets	none
Other expenses	rr_OtherExpensesOverAssets	1.73%	[3]
Total annual fund operating expenses	rr_ExpensesOverAssets	2.38%
Less management fee waiver/expense reimbursements	rr_FeeWaiverOrReimbursementOverAssets	(1.48%)
Total annual fund operating expenses after management fee waiver/expense reimbursements	rr_NetExpensesOverAssets	0.90%	[4]
Fee Waiver or Reimbursement over Assets, Date of Termination	rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination	2013-10-28
Expense Example, with Redemption, 1 Year	rr_ExpenseExampleYear01	92
Expense Example, with Redemption, 3 Years	rr_ExpenseExampleYear03	600
Expense Example, with Redemption, 5 Years	rr_ExpenseExampleYear05	1,136
Expense Example, with Redemption, 10 Years	rr_ExpenseExampleYear10	2,603
Annual Return 2002	rr_AnnualReturn2002	20.55%
Annual Return 2003	rr_AnnualReturn2003	16.10%
Annual Return 2004	rr_AnnualReturn2004	7.12%
Annual Return 2005	rr_AnnualReturn2005	(5.50%)
Annual Return 2006	rr_AnnualReturn2006	5.59%
Annual Return 2007	rr_AnnualReturn2007	2.51%
Annual Return 2008	rr_AnnualReturn2008	(7.56%)
Annual Return 2009	rr_AnnualReturn2009	6.78%
Annual Return 2010	rr_AnnualReturn2010	4.77%
Annual Return 2011	rr_AnnualReturn2011	5.21%
Year to Date Return, Label	rr_YearToDateReturnLabel	Total return January 1 - September 30, 2012:
Bar Chart, Year to Date Return, Date	rr_BarChartYearToDateReturnDate	Sep. 30, 2012
Bar Chart, Year to Date Return	rr_BarChartYearToDateReturn	5.44%
Highest Quarterly Return, Label	rr_HighestQuarterlyReturnLabel	Best quarter during calendar years shown-2Q 2002:
Highest Quarterly Return, Date	rr_BarChartHighestQuarterlyReturnDate	Jun. 30, 2002
Highest Quarterly Return	rr_BarChartHighestQuarterlyReturn	12.70%
Lowest Quarterly Return, Label	rr_LowestQuarterlyReturnLabel	Worst quarter during calendar years shown-1Q 2009:
Lowest Quarterly Return, Date	rr_BarChartLowestQuarterlyReturnDate	Mar. 31, 2009
Lowest Quarterly Return	rr_BarChartLowestQuarterlyReturn	(6.93%)
Label	rr_AverageAnnualReturnLabel	Class Y Return before taxes
1 Year	rr_AverageAnnualReturnYear01	5.21%
5 Years	rr_AverageAnnualReturnYear05	2.21%
10 Years	rr_AverageAnnualReturnYear10	5.25%
Since Inception	rr_AverageAnnualReturnSinceInception	4.74%
Inception Date	rr_AverageAnnualReturnInceptionDate	Jul. 31, 1993
UBS Global Bond Fund (Prospectus Summary) | UBS Global Bond Fund | Class Y | After Taxes on Distributions
Risk Return [Abstract]	rr_RiskReturnAbstract
Label	rr_AverageAnnualReturnLabel	Class Y Return after taxes on distributions
1 Year	rr_AverageAnnualReturnYear01	2.85%
5 Years	rr_AverageAnnualReturnYear05	(0.44%)
10 Years	rr_AverageAnnualReturnYear10	3.13%
Since Inception	rr_AverageAnnualReturnSinceInception	2.63%
Inception Date	rr_AverageAnnualReturnInceptionDate	Jul. 31, 1993
UBS Global Bond Fund (Prospectus Summary) | UBS Global Bond Fund | Class Y | After Taxes on Distributions and Sales
Risk Return [Abstract]	rr_RiskReturnAbstract
Label	rr_AverageAnnualReturnLabel	Class Y Return after taxes on distributions and sale of fund shares
1 Year	rr_AverageAnnualReturnYear01	3.38%
5 Years	rr_AverageAnnualReturnYear05	0.32%
10 Years	rr_AverageAnnualReturnYear10	3.29%
Since Inception	rr_AverageAnnualReturnSinceInception	2.78%
Inception Date	rr_AverageAnnualReturnInceptionDate	Jul. 31, 1993

[1] Average annual total returns for the Barclays Global Aggregate Index for the life of each class were as follows: Class A-6.68%; Class C-6.66%; Class Y-6.24%.

[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 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 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 28, 2013, do not exceed 1.15% for Class A shares, 1.65% for Class C shares and 0.90% 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. 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, the UBS Global AM (Americas)'s three year recoupment rights will survive.

[5] 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.