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Label Element Value
Risk/Return: rr_RiskReturnAbstract  
Central Index Key dei_EntityCentralIndexKey 0000102816
Eaton Vance Greater China Growth Fund  
Risk/Return: rr_RiskReturnAbstract  
Investment Objective, Heading rr_ObjectiveHeading

Investment Objective
Investment Objective, Primary rr_ObjectivePrimaryTextBlock

The Fund’s investment objective is to seek long-term capital appreciation.
Expense, Heading rr_ExpenseHeading

Fees and Expenses of the Fund
Expense, Narrative rr_ExpenseNarrativeTextBlock

This table describes the fees and expenses that you may pay if you buy and hold shares of the Fund.  You may qualify for a reduced sales charge if you invest, or agree to invest over a 13-month period, at least $50,000 in Eaton Vance funds.  More information about these and other discounts is available from your financial intermediary and in Sales Charges beginning on page 14 of this Prospectus and page 21 of the Fund’s Statement of Additional Information.
Shareholder Fees, Caption rr_ShareholderFeesCaption

Shareholder Fees (fees paid directly from your investment)
Operating Expenses, Caption rr_OperatingExpensesCaption

Annual Fund Operating Expenses (expenses you pay each year as a percentage of the value of your investment)
Portfolio Turnover, Heading rr_PortfolioTurnoverHeading

Portfolio Turnover
Portfolio Turnover rr_PortfolioTurnoverTextBlock

The Fund pays transaction costs, such as commissions, when it buys and sells securities (or “turns over” the 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 8 % of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 8.00%
Expense Breakpoint, Discounts rr_ExpenseBreakpointDiscounts

You may qualify for a reduced sales charge if you invest, or agree to invest over a 13-month period, at least $50,000 in Eaton Vance funds.  More information about these and other discounts is available from your financial intermediary and in Sales Charges beginning on page 14 of this Prospectus and page 21 of the Fund’s Statement of Additional Information.
Expense Breakpoint, Minimum Investment Required [Amount] rr_ExpenseBreakpointMinimumInvestmentRequiredAmount $ 50,000
Expense Example, Heading rr_ExpenseExampleHeading

Example.
Expense Example, Narrative rr_ExpenseExampleNarrativeTextBlock

This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds.  The Example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem all of your shares at the end of those periods.  The Example also assumes that your investment has a 5% return each year and that the operating expenses remain the same.  Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Investment Strategy, Heading rr_StrategyHeading

Principal Investment Strategies
Investment Strategy, Narrative rr_StrategyNarrativeTextBlock

Under normal market conditions, the Fund invests at least 80% of its net assets (plus any borrowings for investment purposes) in equity securities of companies located in the China region (the “80% Policy”).  The Fund invests primarily in common stocks of companies that, in the opinion of the investment sub-adviser, will benefit from the economic development and growth of the People’s Republic of China. The China region includes Hong Kong, China, Taiwan, South Korea, Singapore, Malaysia, Thailand, Indonesia and the Philippines, and may include securities trading in the form of depositary receipts.  A company will be considered to be located in the China region if it is domiciled in the China region or has at least 50% of its assets in, or derives 50% or more of its revenues or profits from, the China region.  The Fund may invest 25% or more of its total assets in securities in any one country in the China region. The Fund may invest up to 20% of its net assets outside the China region.  The Fund invests in companies with a broad range of market capitalizations, including smaller, less seasoned companies.  More than 25% of the Fund’s total assets may be denominated in a single currency.  The Fund may invest in private placements.  The Fund is “non-diversified,” which means it may invest a greater percentage of its assets in the securities of a single issuer than a “diversified” fund.

 

The Fund may engage in derivative transactions such as forward foreign currency exchange contracts to attempt to mitigate the adverse effects of foreign currency fluctuations during the period between the purchase of a security and its settlement.  The Fund may also seek to gain exposure to common stocks through the use of equity-linked securities (such as participation notes (“p-notes”)).  The Fund expects to use p-notes to invest indirectly in certain stocks that trade in a market that restricts foreign investors, such as the Fund, from investing directly in the market.  The Fund’s investments in equity-linked securities will not exceed 10% of the Fund’s net assets.

 

The investment sub-adviser invests primarily in common stocks of China region companies expected to grow in value over time, regardless of short-term market fluctuations.  In selecting securities for the Fund, the investment sub-adviser considers companies that it believes have all or most of the following characteristics: proven management; companies benefiting from secular growth trends; the ability to generate consistent returns on capital across a market cycle; a consistent or progressive dividend policy; and companies that are undervalued. Stocks will generally be sold when they have achieved their perceived long-term value or to pursue more attractive investment options.
Strategy Portfolio Concentration rr_StrategyPortfolioConcentration

Under normal market conditions, the Fund invests at least 80% of its net assets (plus any borrowings for investment purposes) in equity securities of companies located in the China region (the “80% Policy”).  The Fund invests primarily in common stocks of companies that, in the opinion of the investment sub-adviser, will benefit from the economic development and growth of the People’s Republic of China. The China region includes Hong Kong, China, Taiwan, South Korea, Singapore, Malaysia, Thailand, Indonesia and the Philippines, and may include securities trading in the form of depositary receipts.  A company will be considered to be located in the China region if it is domiciled in the China region or has at least 50% of its assets in, or derives 50% or more of its revenues or profits from, the China region.  The Fund may invest 25% or more of its total assets in securities in any one country in the China region. The Fund may invest up to 20% of its net assets outside the China region.  The Fund invests in companies with a broad range of market capitalizations, including smaller, less seasoned companies.  More than 25% of the Fund’s total assets may be denominated in a single currency.  The Fund may invest in private placements.  The Fund is “non-diversified,” which means it may invest a greater percentage of its assets in the securities of a single issuer than a “diversified” fund.
Risk, Heading rr_RiskHeading

Principal Risks
Risk, Narrative rr_RiskNarrativeTextBlock

Equity Investing Risk.  Fund performance is sensitive to stock market volatility.  Stock prices may decline in response to adverse changes in the economy or the economic outlook; deterioration in investor sentiment; interest rate, currency, and commodity price fluctuations; adverse geopolitical, social or environmental developments; issuer- and sector-specific considerations; and other factors. Market conditions may affect certain types of stocks to a greater extent than other types of stocks.  If the stock market declines, the value of Fund shares will also likely decline.  Although stock prices can rebound, there is no assurance that values will return to previous levels.

 

Foreign and Emerging Market Investment Risk. Because the Fund invests a significant portion of its assets in foreign instruments, the value of shares may be adversely affected by changes in currency exchange rates and political, economic and market developments abroad, including the imposition of economic and other sanctions by the United States or another country.  Investment markets in emerging market countries are typically smaller, less liquid and more volatile than developed markets, and emerging market securities often involve higher risk than developed market securities .  Trading in foreign markets often involves higher expense than trading in the United States. The value of investments denominated in foreign currencies can be adversely affected by changes in foreign currency exchange rates. Depositary receipts are subject to many of the risks associated with investing directly in foreign instruments.

 

Risks of Investing in Asia.  Economies of countries in the Asian and China regions differ from the U.S. economy in various ways, such as rate of growth of gross national product, rate of inflation, capital reinvestment, resource self-sufficiency and balance of payments position. As export-driven economies, the economies of countries in the Asian and China regions are affected by developments in the economies of their principal trading partners.  Monsoons and natural disasters also can affect the value of investments.  China’s governmental actions and the actions of other governments located in the region can have a significant effect on the economic conditions in the Asian and China regions, which could adversely affect the value and liquidity of investments. For example, a government may restrict investment in companies or industries considered important to national interests, or intervene in the financial markets, such as imposing trading restrictions, or banning or curtailing short selling.  Although the Chinese Government has begun to institute legal and economic reform policies, there can be no assurances that it will continue to pursue such policies or, if it does, that such policies will succeed.

 

Smaller Company Equity Risk. The stocks of smaller, less seasoned companies are generally subject to greater price fluctuations, limited liquidity, higher transaction costs and higher investment risk than the stocks of larger, more established companies.  Smaller, less seasoned companies may have limited product lines, markets or financial resources, may be dependent on a limited management group, and may lack substantial capital reserves or an established performance record.  There may be generally less publicly available information about such companies than for larger, more established companies.

 

Geographic Risk.  Because the Fund will invest a significant portion of its assets in a particular geographic region or country, the value of Fund shares may be affected by events that adversely affect that region or country and may fluctuate more than that of a fund that has less exposure to such region or country.

 

Issuer Diversification Risk. The Fund is “non-diversified,” which means it may invest a greater percentage of its assets in the securities of a single issuer than funds that are “diversified.”  Non-diversified funds face the risk of focusing investments in a small number of issuers, making them more susceptible to risks affecting such issuers than a more diversified fund might be.

 

Derivatives Risk.  The use of derivatives can lead to losses because of adverse movements in the price or value of the asset, index, rate or instrument underlying a derivative, due to failure of a counterparty or due to tax or regulatory constraints. Derivatives may create economic leverage, which represents a non-cash exposure to the underlying asset, index, rate or instrument.  Leverage can increase both the risk and return potential of the Fund. Derivatives risk may be more significant when derivatives are used to enhance return or as a substitute for a cash investment position, rather than solely to hedge the risk of a position held by the Fund .  A decision as to whether, when and how to use derivatives involves the exercise of specialized skill and judgment, and a transaction may be unsuccessful in whole or in part because of market behavior or unexpected events.  Changes in the value of a derivative may not correlate perfectly with the underlying asset, rate or index .  Derivative instruments traded in over-the-counter markets may be difficult to value, may be illiquid, and may be subject to wide swings in valuation caused by changes in the value of the underlying instrument.  If a derivative’s counterparty is unable to honor its commitments, the value of Fund shares may decline and the Fund could experience delays in the return of collateral or other assets held by the counterparty.  The loss on derivative transactions may substantially exceed the initial investment , particularly when there is no stated limit on the Fund’s use of derivatives.

 

Risks Associated with Active Management.  The success of the Fund’s investment program depends on portfolio management’s successful application of analytical skills and investment judgment.  Active management involves subjective decisions.

 

General Fund Investing Risks.  The Fund is not a complete investment program and there is no guarantee that the Fund will achieve its investment objective.  It is possible to lose money by investing in the Fund.  The Fund is designed to be a long-term investment vehicle and is not suited for short-term trading. Investors in the Fund should have a long-term investment perspective and be able to tolerate potentially sharp declines in value. An investment in the Fund is not a deposit in a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency, entity or person.
Risk, Lose Money rr_RiskLoseMoney

The Fund is not a complete investment program and there is no guarantee that the Fund will achieve its investment objective.  It is possible to lose money by investing in the Fund.
Risk Nondiversified Status rr_RiskNondiversifiedStatus

Issuer Diversification Risk. The Fund is “non-diversified,” which means it may invest a greater percentage of its assets in the securities of a single issuer than funds that are “diversified.”  Non-diversified funds face the risk of focusing investments in a small number of issuers, making them more susceptible to risks affecting such issuers than a more diversified fund might be.
Risk, Not Insured Depository Institution rr_RiskNotInsuredDepositoryInstitution

An investment in the Fund is not a deposit in a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency, entity or person.
Bar Chart and Performance Table, Heading rr_BarChartAndPerformanceTableHeading

Performance
Performance, Narrative rr_PerformanceNarrativeTextBlock

The following bar chart and table provide some indication of the risks of investing in the Fund by showing changes in the Fund’s performance from year to year and how the Fund’s average annual returns over time compare with those of a broad-based securities market index.  The returns in the bar chart are for Class A shares and do not reflect a sales charge.  If the sales charge was reflected, the returns would be lower.  Past performance (both before and after taxes) is no guarantee of future results.  The Fund’s performance reflects the effects of expense reductions .  Absent these reductions , performance would have been lower.  Updated Fund performance information can be obtained by visiting www.eatonvance.com.
Performance, Information Illustrates Variability of Returns rr_PerformanceInformationIllustratesVariabilityOfReturns

The following bar chart and table provide some indication of the risks of investing in the Fund by showing changes in the Fund’s performance from year to year and how the Fund’s average annual returns over time compare with those of a broad-based securities market index.
Performance Availability Website Address rr_PerformanceAvailabilityWebSiteAddress

www.eatonvance.com
Performance Past Does Not Indicate Future rr_PerformancePastDoesNotIndicateFuture

Past performance (both before and after taxes) is no guarantee of future results.
Bar Chart Does Not Reflect Sales Loads rr_BarChartDoesNotReflectSalesLoads

The Fund’s performance reflects the effects of expense reductions .  Absent these reductions , performance would have been lower.
Bar Chart, Closing rr_BarChartClosingTextBlock

For the ten years ended December 31, 201 5 , the highest quarterly total return for Class A was 30.52% for the quarter ended June 30, 2009, and the lowest quarterly return  was -24.40% for the quarter ended September 30, 2011.  The year-to-date total return through the end of the most recent calendar quarter (December 31, 201 5 to September 30, 201 6 ) was 11.70 %.
Year to Date Return, Label rr_YearToDateReturnLabel

The year-to-date total return through the end of the most recent calendar quarter (December 31, 201 5 to September 30, 201 6 ) was
Bar Chart, Year to Date Return, Date rr_BarChartYearToDateReturnDate Sep. 30, 2016
Bar Chart, Year to Date Return rr_BarChartYearToDateReturn 11.70%
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel

For the ten years ended December 31, 201 5 , the highest quarterly total return for Class A was
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Jun. 30, 2009
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 30.52%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel

and the lowest quarterly return  was
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Sep. 30, 2011
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (24.40%)
Performance Table Heading rr_PerformanceTableHeading

Average Annual Total Return as of December 31, 2015
Performance Table Does Reflect Sales Loads rr_PerformanceTableDoesReflectSalesLoads

These returns reflect the maximum sales charge for Class A (5.75%) and any applicable contingent deferred sales charge (“CDSC”) for Class B and Class C.
Performance Table Uses Highest Federal Rate rr_PerformanceTableUsesHighestFederalRate

After-tax returns are calculated using the highest historical individual federal income tax rates and do not reflect the impact of state and local taxes.  Actual after-tax returns depend on a shareholder’s tax situation and the actual characterization of distributions, and may differ from those shown.
Performance Table Not Relevant to Tax Deferred rr_PerformanceTableNotRelevantToTaxDeferred

After-tax returns are not relevant to shareholders who hold shares in tax-deferred accounts or to shares held by non-taxable entities.
Performance Table, One Class of after Tax Shown rr_PerformanceTableOneClassOfAfterTaxShown

After-tax returns for other Classes of shares will vary from the after-tax returns presented for Class A shares.
Performance Table Explanation after Tax Higher rr_PerformanceTableExplanationAfterTaxHigher

Return After Taxes on Distributions may be the same as Return Before Taxes for a period because no taxable distributions were made during that period.  Also, Return After Taxes on Distributions and the Sale of Fund Shares for a period may be greater than or equal to Return After Taxes on Distributions for the same period because of losses realized on the sale of Fund shares.
Performance Table Footnotes, Reason Performance Information for Class Different from Immediately Preceding Period rr_PerformanceTableFootnotesReasonPerformanceInformationForClassDifferentFromImmediatelyPrecedingPeriod

The Class I performance shown above for the period prior to October 1, 2009 (commencement of operations) is the performance of Class A shares at net asset value without adjustment for any differences in the expenses of the two classes.  If adjusted for such differences, returns would be different.
Performance Table, Closing rr_PerformanceTableClosingTextBlock

These returns reflect the maximum sales charge for Class A (5.75%) and any applicable contingent deferred sales charge (“CDSC”) for Class B and Class C.  The Class I performance shown above for the period prior to October 1, 2009 (commencement of operations) is the performance of Class A shares at net asset value without adjustment for any differences in the expenses of the two classes.  If adjusted for such differences, returns would be different.  Investors cannot invest directly in an Index.  (Source for the MSCI Golden Dragon Index: MSCI).  MSCI data may not be reproduced or used for any other purpose.  MSCI provides no warranties, has not approved this data and has no liability hereunder.

 

After-tax returns are calculated using the highest historical individual federal income tax rates and do not reflect the impact of state and local taxes.  Actual after-tax returns depend on a shareholder’s tax situation and the actual characterization of distributions, and may differ from those shown.  After-tax returns are not relevant to shareholders who hold shares in tax-deferred accounts or to shares held by non-taxable entities.  After-tax returns for other Classes of shares will vary from the after-tax returns presented for Class A shares.  Return After Taxes on Distributions may be the same as Return Before Taxes for a period because no taxable distributions were made during that period.  Also, Return After Taxes on Distributions and the Sale of Fund Shares for a period may be greater than or equal to Return After Taxes on Distributions for the same period because of losses realized on the sale of Fund shares.
Eaton Vance Greater China Growth Fund | MSCI Golden Dragon Index (reflects net dividends, which reflect the deduction of withholding taxes)  
Risk/Return: rr_RiskReturnAbstract  
Index No Deduction for Fees, Expenses, Taxes rr_IndexNoDeductionForFeesExpensesTaxes

(reflects net dividends, which reflect the deduction of withholding taxes)
One Year rr_AverageAnnualReturnYear01 (7.43%)
Five Years rr_AverageAnnualReturnYear05 1.16%
Ten Years rr_AverageAnnualReturnYear10 6.80%
Eaton Vance Greater China Growth Fund | Class A  
Risk/Return: rr_RiskReturnAbstract  
Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice 5.75%
Maximum Deferred Sales Charge (Load) (as a percentage of the lower of net asset value at purchase or redemption) rr_MaximumDeferredSalesChargeOverOfferingPrice none
Management Fees rr_ManagementFeesOverAssets 1.25%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.30%
Other Expenses rr_OtherExpensesOverAssets 0.48%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 2.03%
Expense Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.08%) [1]
Total Annual Fund Operating Expenses After Expense Reimbursement rr_NetExpensesOverAssets 1.95%
1 Year rr_ExpenseExampleYear01 $ 762
3 Years rr_ExpenseExampleYear03 1,168
5 Years rr_ExpenseExampleYear05 1,598
10 Years rr_ExpenseExampleYear10 2,792
1 Year rr_ExpenseExampleNoRedemptionYear01 762
3 Years rr_ExpenseExampleNoRedemptionYear03 1,168
5 Years rr_ExpenseExampleNoRedemptionYear05 1,598
10 Years rr_ExpenseExampleNoRedemptionYear10 $ 2,792
2006 rr_AnnualReturn2006 47.58%
2007 rr_AnnualReturn2007 61.18%
2008 rr_AnnualReturn2008 (51.05%)
2009 rr_AnnualReturn2009 60.48%
2010 rr_AnnualReturn2010 8.36%
2011 rr_AnnualReturn2011 (22.89%)
2012 rr_AnnualReturn2012 22.69%
2013 rr_AnnualReturn2013 15.47%
2014 rr_AnnualReturn2014 (0.80%)
2015 rr_AnnualReturn2015 (5.01%)
One Year rr_AverageAnnualReturnYear01 (10.46%)
Five Years rr_AverageAnnualReturnYear05 (0.61%)
Ten Years rr_AverageAnnualReturnYear10 6.98%
Eaton Vance Greater China Growth Fund | Class A | After Taxes on Distributions  
Risk/Return: rr_RiskReturnAbstract  
One Year rr_AverageAnnualReturnYear01 (11.49%)
Five Years rr_AverageAnnualReturnYear05 (1.02%)
Ten Years rr_AverageAnnualReturnYear10 6.21%
Eaton Vance Greater China Growth Fund | Class A | After Taxes on Distributions and Sales  
Risk/Return: rr_RiskReturnAbstract  
One Year rr_AverageAnnualReturnYear01 (4.64%)
Five Years rr_AverageAnnualReturnYear05 (0.24%)
Ten Years rr_AverageAnnualReturnYear10 6.01%
Eaton Vance Greater China Growth Fund | Class B  
Risk/Return: rr_RiskReturnAbstract  
Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (Load) (as a percentage of the lower of net asset value at purchase or redemption) rr_MaximumDeferredSalesChargeOverOfferingPrice 5.00%
Management Fees rr_ManagementFeesOverAssets 1.25%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 1.00%
Other Expenses rr_OtherExpensesOverAssets 0.48%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 2.73%
Expense Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.08%) [1]
Total Annual Fund Operating Expenses After Expense Reimbursement rr_NetExpensesOverAssets 2.65%
1 Year rr_ExpenseExampleYear01 $ 768
3 Years rr_ExpenseExampleYear03 1,240
5 Years rr_ExpenseExampleYear05 1,638
10 Years rr_ExpenseExampleYear10 2,887
1 Year rr_ExpenseExampleNoRedemptionYear01 268
3 Years rr_ExpenseExampleNoRedemptionYear03 840
5 Years rr_ExpenseExampleNoRedemptionYear05 1,438
10 Years rr_ExpenseExampleNoRedemptionYear10 $ 2,887
One Year rr_AverageAnnualReturnYear01 (10.07%)
Five Years rr_AverageAnnualReturnYear05 (0.47%)
Ten Years rr_AverageAnnualReturnYear10 6.95%
Eaton Vance Greater China Growth Fund | Class C  
Risk/Return: rr_RiskReturnAbstract  
Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (Load) (as a percentage of the lower of net asset value at purchase or redemption) rr_MaximumDeferredSalesChargeOverOfferingPrice 1.00%
Management Fees rr_ManagementFeesOverAssets 1.25%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 1.00%
Other Expenses rr_OtherExpensesOverAssets 0.48%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 2.73%
Expense Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.08%) [1]
Total Annual Fund Operating Expenses After Expense Reimbursement rr_NetExpensesOverAssets 2.65%
1 Year rr_ExpenseExampleYear01 $ 368
3 Years rr_ExpenseExampleYear03 840
5 Years rr_ExpenseExampleYear05 1,438
10 Years rr_ExpenseExampleYear10 3,055
1 Year rr_ExpenseExampleNoRedemptionYear01 268
3 Years rr_ExpenseExampleNoRedemptionYear03 840
5 Years rr_ExpenseExampleNoRedemptionYear05 1,438
10 Years rr_ExpenseExampleNoRedemptionYear10 $ 3,055
One Year rr_AverageAnnualReturnYear01 (6.53%)
Five Years rr_AverageAnnualReturnYear05 (0.12%)
Ten Years rr_AverageAnnualReturnYear10 6.95%
Eaton Vance Greater China Growth Fund | Class I  
Risk/Return: rr_RiskReturnAbstract  
Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (Load) (as a percentage of the lower of net asset value at purchase or redemption) rr_MaximumDeferredSalesChargeOverOfferingPrice none
Management Fees rr_ManagementFeesOverAssets 1.25%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses rr_OtherExpensesOverAssets 0.48%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 1.73%
Expense Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.08%) [1]
Total Annual Fund Operating Expenses After Expense Reimbursement rr_NetExpensesOverAssets 1.65%
1 Year rr_ExpenseExampleYear01 $ 168
3 Years rr_ExpenseExampleYear03 537
5 Years rr_ExpenseExampleYear05 931
10 Years rr_ExpenseExampleYear10 2,034
1 Year rr_ExpenseExampleNoRedemptionYear01 168
3 Years rr_ExpenseExampleNoRedemptionYear03 537
5 Years rr_ExpenseExampleNoRedemptionYear05 931
10 Years rr_ExpenseExampleNoRedemptionYear10 $ 2,034
One Year rr_AverageAnnualReturnYear01 (4.70%)
Five Years rr_AverageAnnualReturnYear05 0.87%
Ten Years rr_AverageAnnualReturnYear10 7.83%
Inception Date rr_AverageAnnualReturnInceptionDate Oct. 01, 2009
[1] The investment adviser and the sub-adviser have agreed to reimburse the Fund's expenses to the extent that Total Annual Fund Operating Expenses exceed 1.95% for Class A shares, 2.65% for Class B and Class C shares and 1.65% for Class I shares. This expense reimbursement will continue through December 31, 201 7 . Any amendment to or termination of this reimbursement would require approval of the Board of Trustees. The expense reimbursement relates to ordinary operating expenses only and does not include expenses such as: brokerage commissions, acquired fund fees and expenses of unaffiliated funds, interest expense, taxes or litigation expenses. Amounts reimbursed may be recouped by the investment adviser and the sub-adviser during the same fiscal year to the extent actual expenses are less than the contractual expense cap during such year.