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Risk/Return: 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 51 of the Fund's prospectus and in "Reduced sales charges, additional purchase, exchange and redemption information and other services" on page 113 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 54% of the average value of its portfolio.

Portfolio Turnover, Rate rr_PortfolioTurnoverRate 54.00%
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


In order to achieve the Fund's objective, the Fund employs an asset allocation strategy that seeks to maximize total return. The Advisor does not represent or guarantee that the Fund will meet this total return goal.


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 portfolio managers will manage the Fund's portfolio using the following investment process as described below:


The strategy invests in the full spectrum of instruments and markets globally. The Advisor believes that the Advisor is able to improve the return outcome and risk management of the Fund by employing a well diversified strategy across a broad global opportunity set. Returns are generated from asset allocation across markets, currency and security selection.


Asset allocation decisions are primarily driven by UBS Global AM (Americas)'s assessment of valuation and prevailing market conditions in the United States and around the world. Using a systematic approach, the portfolio management team analyzes the asset classes and investments across equities, fixed income, and alternative asset classes (including currency), considering both fundamental valuation, economic and other market indicators. Regarding valuation, the portfolio managers evaluate whether asset classes and investments are attractively priced relative to fundamentals. The starting point is to assess the intrinsic value of an asset class, as determined by the fundamentals that drive an asset class' future cash flow. The intrinsic value represents a long term anchor point to which the portfolio managers believe the asset class will eventually revert.


Fair value estimates of asset classes and markets are an output of UBS Global AM (Americas)'s proprietary valuation models. Discounting the asset's future cash flow using a discount rate that appropriately reflects the inherent investment risk associated with holding the asset gives the asset's fair value. The competitive advantage of the portfolio manager's models lies in the quality and consistency of the inputs used and, therefore, the reliability of valuation conclusions. The discrepancy between actual market level and fair value (the price/value discrepancy) is the primary valuation signal used in identifying investment opportunities.


Next, the portfolio managers assess additional market indicators and consider the effect that other determinants of economic growth and overall market volatility will have on each asset class. While in theory price/value discrepancies may resolve themselves quickly and linearly, in practice price/value discrepancy can grow larger before it resolves. While valuation models have proven effective at identifying longer-term price/value discrepancies, in the shorter term other factors can swamp valuation considerations. Thus, the portfolio managers incorporate an additional discipline in our idea generation process. The portfolio managers refer to this additional step in its idea generation process as market behavior analysis. Adding this step helps them to understand what other market indicators might drive the market towards or away from fundamental value. The portfolio managers perform systematic analysis of non-valuation drivers using models measuring sentiment, momentum and flows, market stress, the stage of the economic cycle, as well as an assessment of the general macroeconomic landscape. Evaluating various market indicators become increasingly important when an asset class is trading close to its fair value. Conversely, valuation considerations tend to dominate when an asset class is substantially above or below fair value, but the Advisor recognizes that the use of market behavior analysis during these periods is very important to helping improve the timing in and out of these asset classes with very stretched valuations.


The asset allocation process is structured around the Asset Allocation & Currency (AAC) Investment Committee (the "AAC Committee") meetings, which provides a forum for debate and the exploration of all ramifications of any investment decision, rather than aiming for a consensus to be reached. Instead, any voting member of the AAC Committee can sponsor a trade idea, preparing a detailed investment thesis to support the view. An investment thesis has to define the investment rationale based on valuation and market behavioral influences, the time scale for it being realized, the transaction costs and the potential milestones the Advisor would expect to evaluate whether or not the view is correct. The sponsor is then responsible for convincing another member of the AAC Committee to support the idea as co-sponsor.


Bottom up selection across active equity and fixed income markets can be utilized as part of the asset allocation process at the asset class level. With respect to specific equity securities for inclusion in the Fund's equity asset classes, the Advisor may utilize fundamental valuation, quantitative and growth-oriented strategies. The Advisor's bottom up fixed income security selection 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 Advisor uses both fundamental valuation and market behavior analysis to make the two-pronged determination of risk budget and risk allocation. The portfolio managers work closely with the Risk Management team, members of which attend the AAC Committee meetings, to determine the appropriate amount of risk capital to allocate to the underlying trade ideas given the strategy's risk budget and objectives, prevailing investment opportunities, and other strategy exposures. To assist in this process the Risk Management team performs scenario and correlation analysis to better understand the risk and diversification of the overall strategy, and ensures that unintended factor exposures are identified, managed and monitored.

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 Financial Services LLC ("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 risk, management risk and counterparty risk (which is the risk that a counterparty to a derivative contract is unable or unwilling to meet its financial obligations). 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 risk: 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 Risk/return bar chart and table
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock

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 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 Total return UBS Global Allocation Fund Annual Total Returns of Class Y Shares
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock

Total return January 1 - September 30, 2013: 6.01%
Best quarter during calendar years shown—2Q 2009: 23.56%
Worst quarter during calendar years shown—4Q 2008: (21.44)%

Year to Date Return, Label rr_YearToDateReturnLabel Total return
Bar Chart, Year to Date Return, Date rr_BarChartYearToDateReturnDate Sep. 30, 2013
Bar Chart, Year to Date Return rr_BarChartYearToDateReturn 6.01%
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Best quarter
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Jun. 30, 2009
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 23.56%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Worst quarter
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Dec. 31, 2008
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (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 (figures reflect sales charges) (for the periods ended December 31, 2012)
Russell 3000 Index
  
Risk/Return: rr_RiskReturnAbstract  
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 16.42%
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 2.04%
Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10 7.68%
MSCI World Free Index (net)
  
Risk/Return: rr_RiskReturnAbstract  
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 15.83%
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 (1.18%)
Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10 7.51%
Citigroup World Government Bond Index
  
Risk/Return: rr_RiskReturnAbstract  
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 1.65%
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 5.27%
Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10 6.04%
GSMI Mutual Fund Index
  
Risk/Return: rr_RiskReturnAbstract  
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 11.88%
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 2.13%
Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10 7.74%
CLASS A
  
Risk/Return: rr_RiskReturnAbstract  
Maximum front-end sales charge (load) imposed on purchases (as a % of offering price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice 5.50%
Maximum contingent deferred sales charge (load) (CDSC) (as a % of purchase or sales price, whichever is less) rr_MaximumDeferredSalesChargeOverOther none [1]
Redemption Fee (as a percentage of Amount Redeemed) rr_RedemptionFeeOverRedemption (1.00%)
Management fees rr_ManagementFeesOverAssets 0.78%
Distribution and/or service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Other expenses rr_OtherExpensesOverAssets 0.25%
Acquired fund fees and expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.08%
Total annual fund operating expenses rr_ExpensesOverAssets 1.36% [2]
Expenses Deferred Charges [Text Block] rr_ExpensesDeferredChargesTextBlock Purchases of $1 million or more that were not subject to a front-end sales charge are subject to a 1% CDSC if sold within one year of the purchase date.
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 681
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 957
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 1,254
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 2,095
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 6.20%
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 (1.08%)
Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10 5.71%
Average Annual Returns, Inception Date rr_AverageAnnualReturnInceptionDate Jun. 30, 1997
CLASS C
  
Risk/Return: rr_RiskReturnAbstract  
Maximum front-end sales charge (load) imposed on purchases (as a % of offering price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum contingent deferred sales charge (load) (CDSC) (as a % of purchase or sales price, whichever is less) rr_MaximumDeferredSalesChargeOverOther 1.00%
Redemption Fee (as a percentage of Amount Redeemed) rr_RedemptionFeeOverRedemption (1.00%)
Management fees rr_ManagementFeesOverAssets 0.78%
Distribution and/or service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets 1.00%
Other expenses rr_OtherExpensesOverAssets 0.28%
Acquired fund fees and expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.08%
Total annual fund operating expenses rr_ExpensesOverAssets 2.14% [2]
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 317
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 670
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 1,149
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 2,472
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 217
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 670
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 1,149
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 2,472
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 10.49% [3]
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 (0.72%) [3]
Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10 5.50% [3]
Average Annual Returns, Inception Date rr_AverageAnnualReturnInceptionDate Nov. 22, 2001 [3]
CLASS Y
  
Risk/Return: rr_RiskReturnAbstract  
Maximum front-end sales charge (load) imposed on purchases (as a % of offering price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum contingent deferred sales charge (load) (CDSC) (as a % of purchase or sales price, whichever is less) rr_MaximumDeferredSalesChargeOverOther none
Redemption Fee (as a percentage of Amount Redeemed) rr_RedemptionFeeOverRedemption (1.00%)
Management fees rr_ManagementFeesOverAssets 0.78%
Distribution and/or service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets none
Other expenses rr_OtherExpensesOverAssets 0.20%
Acquired fund fees and expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.08%
Total annual fund operating expenses rr_ExpensesOverAssets 1.06% [2]
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 108
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 337
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 585
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,294
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%)
Annual Return 2012 rr_AnnualReturn2012 12.69%
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 12.69%
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 0.36%
Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10 6.61%
Average Annual Returns, Inception Date rr_AverageAnnualReturnInceptionDate Aug. 31, 1992
CLASS Y | After Taxes on Distributions
  
Risk/Return: rr_RiskReturnAbstract  
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 11.98%
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 (1.54%)
Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10 5.04%
CLASS Y | After Taxes on Distributions and Sale of Fund Shares
  
Risk/Return: rr_RiskReturnAbstract  
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 8.57%
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 (0.70%)
Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10 5.06%
[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.