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 20 of this Prospectus and page 23 of the Fund’s Statement of Additional Information.

Expense Example [Heading]

rr_ExpenseExampleHeading

Example.

Strategy [Heading]

rr_StrategyHeading

Principal Investment Strategies

Strategy Portfolio Concentration [Text]

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 Asian small companies (the “80% Policy”). At the time of investment, Asian small companies are companies that (a) have a market capitalization that does not exceed the maximum market capitalization of companies included in the MSCI All Country Asia ex Japan Small Cap Index (full market capitalization) (the “market cap maximum”) on the last business day of the previous quarter and (b) are located in or have securities that are principally traded in an Asian region country. As of September 30, 201 4 , the maximum market capitalization of companies included in the Index (full market capitalization) was approximately $ 4.13 billion. The Fund may invest 25% or more of its total assets in securities of issuers located in any one country, and may retain securities of a company with a market capitalization that grows after initial investment over the market cap maximum. The Fund normally invests in the securities markets of countries in the Asian region, including Australia, China, Hong Kong, India, Indonesia, Japan, Malaysia, Pakistan, the Philippines, Singapore, South Korea, Sri Lanka, Taiwan and Thailand, and may include securities trading in the form of depositary receipts. While there is no minimum or maximum limitation on assets that may be invested in a single country, it is anticipated that investments in Hong Kong, India, South Korea or Singapore may exceed 25% of total assets. More than 25% of the Fund’s total assets may be denominated in a single currency. The Fund has historically held fewer than 75 stocks; therefore, in that situation, the Fund’s value may be more sensitive to developments affecting particular stocks than would be a more broadly diversified fund. At times, the Fund may attempt to hedge foreign currency fluctuations by entering into forward foreign currency exchange contracts and options. The Fund may invest in private placements.

Risk Narrative [Text Block]

rr_RiskNarrativeTextBlock

Equity Investing Risk. The Fund’s shares may be sensitive to stock market volatility and the stocks in which the Fund invests may be more volatile than the stock market as a whole. The value of equity investments and related instruments may decline in response to conditions affecting the general economy; overall market changes; local, regional or global political, social or economic instability; and currency, interest rate and commodity price fluctuations, as well as issuer or sector specific events. 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 and although stock values 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 Fund shares can 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. In emerging or less developed countries, these risks can be more significant. Investment markets in emerging market countries are typically substantially smaller, less liquid and more volatile than the major markets in developed countries. As a result, Fund share values may be more volatile than if the Fund invested only in developed markets. Emerging market countries may have relatively unstable governments and economies. Emerging market investments often are subject to speculative trading, which typically contributes to volatility. Trading in foreign and emerging markets typically involves higher expense than trading in the United States. The Fund may have difficulties enforcing its legal or contractual rights in a foreign country. 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 securities, including political, economic and market risks.

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. 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.

Small Company Equity Risk. The stocks of small and emerging 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. Small and emerging 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. Stocks of small and emerging companies frequently have lower trading volumes making them more volatile and potentially more difficult to value.

Geographic Risk. Because the Fund may 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.

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 in the Fund, which magnifies the Fund’s exposure to the underlying investment. 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, and the Fund could lose more than the principal amount invested. 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.

Risks Associated with Active Management. The Fund is an actively managed portfolio and its success depends upon the investment skills and analytical abilities of the sub-adviser to develop and effectively implement strategies to achieve the Fund’s investment objective. Subjective decisions made by the sub-adviser may cause the Fund to incur losses or to miss profit opportunities on which it may otherwise have capitalized.

General Fund Investing Risks. The Fund is not a complete investment program and you may lose money by investing in the Fund. All investments carry a certain amount of risk and there is no guarantee that the Fund will be able to achieve its investment objective. 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 Not Insured Depository Institution [Text]

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.

Performance Narrative [Text Block]

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 Availability Website Address [Text]

rr_PerformanceAvailabilityWebSiteAddress

www.eatonvance.com

Bar Chart Does Not Reflect Sales Loads [Text]

rr_BarChartDoesNotReflectSalesLoads

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.

Bar Chart, Year to Date Return, Date

rr_BarChartYearToDateReturnDate

Sep. 30, 2014

Highest Quarterly Return, Label

rr_HighestQuarterlyReturnLabel

For the ten years ended December 31, 201 3 , the highest quarterly total return for Class A was

Highest Quarterly Return

rr_BarChartHighestQuarterlyReturn

41.96%

Lowest Quarterly Return, Date

rr_BarChartLowestQuarterlyReturnDate

Sep. 30, 2008

Performance Table Does Reflect Sales Loads

rr_PerformanceTableDoesReflectSalesLoads

These returns reflect the maximum sales charge for Class A (5.75%).

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 Closing [Text Block]

rr_PerformanceTableClosingTextBlock

These returns reflect the maximum sales charge for Class A (5.75%). Investors cannot invest directly in an Index. (Source for the MSCI All Country Asia ex Japan Small Cap Index : MSCI Barra). MSCI data may not be reproduced or used for any other purpose. MSCI provides no warranties, has not prepared or 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. Return After Taxes on Distributions for a period 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 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.

[RiskReturnAbstract]

rr_RiskReturnAbstract

Maximum Sales Charge (Load) (as a percentage of offering price)

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

5.75%

Management Fees

rr_ManagementFeesOverAssets

1.25%

Other Expenses

rr_OtherExpensesOverAssets

0.78%

Expense Reimbursement

rr_FeeWaiverOrReimbursementOverAssets

(0.58%)

^[1]

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

743

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

rr_AnnualReturn2004

rr_AnnualReturn2006

rr_AnnualReturn2008

rr_AnnualReturn2010

rr_AnnualReturn2012

rr_AverageAnnualReturnYear01

3.19%

10 Years

rr_AverageAnnualReturnYear10

5.29%

[RiskReturnAbstract]

rr_RiskReturnAbstract

5 Years

rr_AverageAnnualReturnYear05

15.43%

1 Year

rr_AverageAnnualReturnYear01

2.01%

10 Years

rr_AverageAnnualReturnYear10

4.32%

[RiskReturnAbstract]

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

6.89%

10 Years

rr_AverageAnnualReturnYear10

10.91%

[RiskReturnAbstract]

rr_RiskReturnAbstract

Objective, Primary [Text Block]

rr_ObjectivePrimaryTextBlock

The Fund’s investment objective is to seek long-term capital appreciation.

Expense Narrative [Text Block]

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 2 0 of this Prospectus and page 23 of the Fund’s Statement of Additional Information.

Operating Expenses Caption [Text]

rr_OperatingExpensesCaption

Annual Fund Operating Expenses (expenses you pay each year as a percentage of the value of your investment)

Portfolio Turnover [Text Block]

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 33 % of the average value of its portfolio.

Expense Breakpoint Discounts [Text]

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 20 of this Prospectus and page 23 of the Fund’s Statement of Additional Information.

Expense Example [Heading]

rr_ExpenseExampleHeading

Example.

Strategy [Heading]

rr_StrategyHeading

Principal Investment Strategies

Strategy Portfolio Concentration [Text]

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. Under normal circumstances, the Fund primarily invests in companies in the China region, which 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 Narrative [Text Block]

rr_RiskNarrativeTextBlock

Equity Investing Risk. The Fund’s shares may be sensitive to stock market volatility and the stocks in which the Fund invests may be more volatile than the stock market as a whole. The value of equity investments and related instruments may decline in response to conditions affecting the general economy; overall market changes; local, regional or global political, social or economic instability; and currency, interest rate and commodity price fluctuations, as well as issuer or sector specific events. 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 and although stock values 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 Fund shares can 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. In emerging or less developed countries, these risks can be more significant. Investment markets in emerging market countries are typically substantially smaller, less liquid and more volatile than the major markets in developed countries. As a result, Fund share values may be more volatile than if the Fund invested only in developed markets. Emerging market countries may have relatively unstable governments and economies. Emerging market investments often are subject to speculative trading, which typically contributes to volatility. Trading in foreign and emerging markets typically involves higher expense than trading in the United States. The Fund may have difficulties enforcing its legal or contractual rights in a foreign country. 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 securities, including political, economic and market risks.

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. 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 may 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 in the Fund, which magnifies the Fund’s exposure to the underlying investment. 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, and the Fund could lose more than the principal amount invested. 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.

Risks Associated with Active Management. The Fund is an actively managed portfolio and its success depends upon the investment skills and analytical abilities of the sub-adviser to develop and effectively implement strategies to achieve the Fund’s investment objective. Subjective decisions made by the sub-adviser may cause the Fund to incur losses or to miss profit opportunities on which it may otherwise have capitalized.

General Fund Investing Risks. The Fund is not a complete investment program and you may lose money by investing in the Fund. All investments carry a certain amount of risk and there is no guarantee that the Fund will be able to achieve its investment objective. 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 Nondiversified Status [Text]

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.

Bar Chart and Performance Table [Heading]

rr_BarChartAndPerformanceTableHeading

Performance

Performance Information Illustrates Variability of Returns [Text]

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 Past Does Not Indicate Future [Text]

rr_PerformancePastDoesNotIndicateFuture

Past performance (both before and after taxes) is no guarantee of future results.

Bar Chart Closing [Text Block]

rr_BarChartClosingTextBlock

For the ten years ended December 31, 201 3 , 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 3 to September 30, 2014 ) was -1.79 %.

Bar Chart, Year to Date Return

rr_BarChartYearToDateReturn

(1.79%)

Highest Quarterly Return, Date

rr_BarChartHighestQuarterlyReturnDate

Jun. 30, 2009

Lowest Quarterly Return, Label

rr_LowestQuarterlyReturnLabel

and the lowest quarterly return was

Lowest Quarterly Return

rr_BarChartLowestQuarterlyReturn

(24.40%)

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 One Class of after Tax Shown [Text]

rr_PerformanceTableOneClassOfAfterTaxShown

After-tax returns for other classes of shares will vary from the after-tax returns presented for Class A shares.

Performance Table Footnotes, Reason Performance Information for Class Different from Immediately Preceding Period [Text]

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.

Trading Symbol

dei_TradingSymbol

EVCGX

Maximum Deferred Sales Charge (Load) (as a percentage of the lower of net asset value at purchase or redemption)

rr_MaximumDeferredSalesChargeOverOther

none

Distribution and Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

0.30%

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

1.94%

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

1,149

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

2,709

Expense Example, No Redemption, 3 Years

rr_ExpenseExampleNoRedemptionYear03

1,149

Expense Example, No Redemption, 10 Years

rr_ExpenseExampleNoRedemptionYear10

rr_AnnualReturn2005

rr_AnnualReturn2007

rr_AnnualReturn2009

rr_AnnualReturn2011

rr_AnnualReturn2013

rr_AverageAnnualReturnYear05

12.35%

Trading Symbol

dei_TradingSymbol

EMCGX

Maximum Deferred Sales Charge (Load) (as a percentage of the lower of net asset value at purchase or redemption)

rr_MaximumDeferredSalesChargeOverOther

5.00%

Distribution and Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

1.00%

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

2.64%

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

1,220

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

2,804

Expense Example, No Redemption, 3 Years

rr_ExpenseExampleNoRedemptionYear03

820

Expense Example, No Redemption, 10 Years

rr_ExpenseExampleNoRedemptionYear10

2,804

5 Years

rr_AverageAnnualReturnYear05

12.70%

Trading Symbol

dei_TradingSymbol

ECCGX

Maximum Deferred Sales Charge (Load) (as a percentage of the lower of net asset value at purchase or redemption)

rr_MaximumDeferredSalesChargeOverOther

1.00%

Distribution and Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

1.00%

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

2.64%

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

820

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

2,973

Expense Example, No Redemption, 3 Years

rr_ExpenseExampleNoRedemptionYear03

820

Expense Example, No Redemption, 10 Years

rr_ExpenseExampleNoRedemptionYear10

2,973

5 Years

rr_AverageAnnualReturnYear05

12.94%

Trading Symbol

dei_TradingSymbol

EICGX

Maximum Deferred Sales Charge (Load) (as a percentage of the lower of net asset value at purchase or redemption)

rr_MaximumDeferredSalesChargeOverOther

none

Distribution and Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

none

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

1.64%

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

517

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

1,944

Expense Example, No Redemption, 3 Years

rr_ExpenseExampleNoRedemptionYear03

517

Expense Example, No Redemption, 10 Years

rr_ExpenseExampleNoRedemptionYear10

1,944

5 Years

rr_AverageAnnualReturnYear05

14.01%

1 Year

rr_AverageAnnualReturnYear01

8.93%

10 Years

rr_AverageAnnualReturnYear10

9.81%

[RiskReturnAbstract]

rr_RiskReturnAbstract

5 Years

rr_AverageAnnualReturnYear05

10.26%

Index No Deduction for Fees, Expenses, Taxes [Text]

rr_IndexNoDeductionForFeesExpensesTaxes

(reflects net dividends, which reflect the deduction of withholding taxes)

5 Years

rr_AverageAnnualReturnYear05

14.92%

Objective [Heading]

rr_ObjectiveHeading

Investment Objective

Expense [Heading]

rr_ExpenseHeading

Fees and Expenses of the Fund

Shareholder Fees Caption [Text]

rr_ShareholderFeesCaption

Shareholder Fees (fees paid directly from your investment)

Portfolio Turnover [Heading]

rr_PortfolioTurnoverHeading

Portfolio Turnover

Portfolio Turnover, Rate

rr_PortfolioTurnoverRate

32.00%

Expense Breakpoint, Minimum Investment Required [Amount]

rr_ExpenseBreakpointMinimumInvestmentRequiredAmount

50,000

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 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:

Strategy Narrative [Text Block]

rr_StrategyNarrativeTextBlock

The Fund invests primarily in common stocks of U.S. growth companies but may invest up to 25% of its net assets in foreign securities, some of which may be located in emerging market countries. As an alternative to holding foreign stocks directly, the Fund may invest in U.S. dollar-denominated securities of foreign companies that trade on U.S. exchanges or in the over-the-counter market (including depositary receipts, which evidence ownership in underlying foreign stocks). The Fund may invest up to 10% of its assets in real estate investment trusts (“REITs”). The Fund may also invest in other pooled investment vehicles and may lend its securities. The Fund’s investment objective may not be changed without shareholder approval.

The Fund invests primarily in common stocks of companies that are expected, over the long term, to have earnings growth that is faster than the growth of the U.S. economy and the U.S. stock market as a whole. Growth companies owned by the Fund may include both large and established market leaders, as well as smaller, less seasoned companies. The Fund may invest in dividend-paying stocks to achieve the secondary consideration of investment income. However, growth stocks typically pay smaller dividends. The Fund’s ability to pay dividends depends on the yields available on common stocks and Fund (and class) expenses. If Fund (and class) expenses exceed income, Fund shareholders will not receive distributions.

The portfolio managers seek to purchase stocks that are reasonably priced in relation to their fundamental value, and that the portfolio managers believe will grow in value over time. In making investment decisions, the portfolio managers may utilize the information provided by, and the expertise of, the investment adviser’s research staff. Management of the Fund involves consideration of numerous factors (such as potential for price appreciation, risk/return, the mix of securities held by the Fund and, secondarily, long-term dividend prospects). The sell process combines bottom-up and top-down considerations. The portfolio managers will normally consider selling securities when they reach the adviser’s price target, other securities are identified to displace a current holding, or fundamentals deteriorate and the original investment case is no longer valid. A top-down assessment of an industry or the economy can also influence sell decisions at times.

Risk [Heading]

rr_RiskHeading

Principal Risks

Risk Lose Money [Text]

rr_RiskLoseMoney

The Fund is not a complete investment program and you may lose money by investing in the Fund.

Bar Chart and Performance Table [Heading]

rr_BarChartAndPerformanceTableHeading

Performance

Performance Information Illustrates Variability of Returns [Text]

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 two broad-based securities market indices.

Performance Past Does Not Indicate Future [Text]

rr_PerformancePastDoesNotIndicateFuture

Past performance (both before and after taxes) is no guarantee of future results.

Bar Chart Closing [Text Block]

rr_BarChartClosingTextBlock

For the ten years ended December 31, 2013, the highest quarterly total return for Class A was 23.36 % for the quarter ended June 30, 2009 , and the lowest quarterly return was –33.13% for the quarter ended December 31, 2008. The year-to-date total return through the end of the most recent calendar quarter (December 31, 2013 to September 30, 2014 ) was 4.54 %.

Bar Chart, Year to Date Return

rr_BarChartYearToDateReturn

4.54%

Highest Quarterly Return, Date

rr_BarChartHighestQuarterlyReturnDate

Jun. 30, 2009

Lowest Quarterly Return, Label

rr_LowestQuarterlyReturnLabel

and the lowest quarterly return was

Lowest Quarterly Return

rr_BarChartLowestQuarterlyReturn

(33.13%)

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 One Class of after Tax Shown [Text]

rr_PerformanceTableOneClassOfAfterTaxShown

After-tax returns for other Classes of shares will vary from the after-tax returns presented for Class A shares.

Performance Table Footnotes, Reason Performance Information for Class Different from Immediately Preceding Period [Text]

rr_PerformanceTableFootnotesReasonPerformanceInformationForClassDifferentFromImmediatelyPrecedingPeriod

The Class I performance shown above for the period prior to July 18, 2012 (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.

Trading Symbol

dei_TradingSymbol

EVGFX

Maximum Deferred Sales Charge (Load) (as a percentage of the lower of net asset value at purchase or redemption)

rr_MaximumDeferredSalesChargeOverOther

none

Distribution and Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

0.25%

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

1.17%

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

925

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

1,914

Expense Example, No Redemption, 3 Years

rr_ExpenseExampleNoRedemptionYear03

925

Expense Example, No Redemption, 10 Years

rr_ExpenseExampleNoRedemptionYear10

rr_AnnualReturn2005

rr_AnnualReturn2007

rr_AnnualReturn2009

rr_AnnualReturn2011

rr_AnnualReturn2013

rr_AverageAnnualReturnYear05

18.13%

Trading Symbol

dei_TradingSymbol

EMGFX

Maximum Deferred Sales Charge (Load) (as a percentage of the lower of net asset value at purchase or redemption)

rr_MaximumDeferredSalesChargeOverOther

5.00%

Distribution and Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

1.00%

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

1.92%

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

1,003

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

2,048

Expense Example, No Redemption, 3 Years

rr_ExpenseExampleNoRedemptionYear03

603

Expense Example, No Redemption, 10 Years

rr_ExpenseExampleNoRedemptionYear10

2,048

5 Years

rr_AverageAnnualReturnYear05

18.47%

Trading Symbol

dei_TradingSymbol

ECGFX

Maximum Deferred Sales Charge (Load) (as a percentage of the lower of net asset value at purchase or redemption)

rr_MaximumDeferredSalesChargeOverOther

1.00%

Distribution and Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

1.00%

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

1.92%

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

603

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

2,243

Expense Example, No Redemption, 3 Years

rr_ExpenseExampleNoRedemptionYear03

603

Expense Example, No Redemption, 10 Years

rr_ExpenseExampleNoRedemptionYear10

2,243

5 Years

rr_AverageAnnualReturnYear05

18.63%

Trading Symbol

dei_TradingSymbol

EIGFX

Maximum Deferred Sales Charge (Load) (as a percentage of the lower of net asset value at purchase or redemption)

rr_MaximumDeferredSalesChargeOverOther

none

Distribution and Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

none

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

0.92%

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

293

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

1,131

Expense Example, No Redemption, 3 Years

rr_ExpenseExampleNoRedemptionYear03

293

Expense Example, No Redemption, 10 Years

rr_ExpenseExampleNoRedemptionYear10

1,131

5 Years

rr_AverageAnnualReturnYear05

19.62%

1 Year

rr_AverageAnnualReturnYear01

27.48%

10 Years

rr_AverageAnnualReturnYear10

6.94%

[RiskReturnAbstract]

rr_RiskReturnAbstract

5 Years

rr_AverageAnnualReturnYear05

14.73%

Index No Deduction for Fees, Expenses, Taxes [Text]

rr_IndexNoDeductionForFeesExpensesTaxes

(reflects no deduction for fees, expenses or taxes)

5 Years

rr_AverageAnnualReturnYear05

20.55%

Index No Deduction for Fees, Expenses, Taxes [Text]

rr_IndexNoDeductionForFeesExpensesTaxes

(reflects no deduction for fees, expenses or taxes)

5 Years

rr_AverageAnnualReturnYear05

17.93%

Objective [Heading]

rr_ObjectiveHeading

Investment Objective

Expense [Heading]

rr_ExpenseHeading

Fees and Expenses of the Fund

Shareholder Fees Caption [Text]

rr_ShareholderFeesCaption

Shareholder Fees (fees paid directly from your investment)

Portfolio Turnover [Heading]

rr_PortfolioTurnoverHeading

Portfolio Turnover

Portfolio Turnover, Rate

rr_PortfolioTurnoverRate

42.00%

Expense Breakpoint, Minimum Investment Required [Amount]

rr_ExpenseBreakpointMinimumInvestmentRequiredAmount

50,000

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 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:

Strategy Narrative [Text Block]

rr_StrategyNarrativeTextBlock

In seeking its investment objective, the Fund has flexibility to allocate its assets in markets around the world and among various asset classes, including equity, fixed-income, commodity, currency and cash investments.

The Fund is managed in a macro-driven, top-down style that emphasizes and de-emphasizes various global market segments and asset classes at different times. Market segments chosen for emphasis and/or de-emphasis may vary from general market consensus views and the Fund may at times seek to identify areas where there is in the sub-adviser’s opinion scarcity of capital and/or potentially overlooked investment opportunities. Exposures will vary among asset classes based on the sub-adviser’s assessment of a range of proprietary and non-proprietary quantitative indicators and the firm’s macro-economic analysis and judgment. It is expected that the macro-economic analysis will evolve over time and may include consideration of the following: historical risk and return characteristics; global market valuations; global yield curves; asset class, regional, and country correlations; profit cycle analyses and style and sector rotation; expected beta; estimate revisions and earnings surprises; investor sentiment and other factors. Individual equity security selection is based on quantitative screening and optimization to achieve desired market exposures while seeking to manage security-specific and other observable market risks. The portfolio is monitored on an ongoing basis and rebalanced as necessary to seek to ensure that desired market exposures and risk parameters are maintained. Securities may be sold if they exhibit performance that might counteract the desired exposures or to implement a revised allocation based on a modified top-down view.

Under normal circumstances, the Fund currently expects to invest 0-75% of its net assets in equity securities, 25-90% in fixed-income securities, 0-25% in commodities (primarily through the use of exchange-traded funds (“ETFs”) that invest in commodities or commodities-related investments) and/or currencies, and 0-25% in cash and cash equivalents. The Fund may also invest in derivatives (as described below) to obtain such exposures. To the extent the Fund holds cash as collateral for derivatives, the cash and cash equivalents range described above may be exceeded. The expected long-term (over a true secular cycle of at least 10 years) target allocation of the Fund is 60% in fixed income securities and 40% in equity securities. There is no requirement to manage the Fund within this target allocation. The Fund’s actual asset allocation may be materially different depending on market conditions and the Fund’s asset allocation over shorter or longer market cycles may differ materially from the target.

The Fund may invest without limit in both developed and emerging markets including frontier markets. Such investments may include securities denominated in foreign currencies and securities trading in the form of depositary receipts. The Fund may invest in fixed-income securities of any credit quality including, but not limited to, corporate bonds, securities issued or guaranteed by the U.S. government or its agencies or instrumentalities, obligations of other sovereign nations, municipal obligations, mortgage-backed securities and inflation-linked debt securities. The Fund may invest in stocks of companies of any capitalization, publicly traded real estate investment trusts and exchange-traded notes (“ETNs ”). The Fund may invest in certain ETFs beyond the limits under the Investment Company Act of 1940 (the “1940 Act”), subject to certain terms and conditions and may invest in other pooled investment vehicles (including affiliated and unaffiliated mutual funds to the extent permitted by the 1940 Act). Investment in cash or cash equivalents may include U.S and foreign bank certificates of deposit, fixed time deposits, repurchase agreements, bankers’ acceptances and other short-term instruments with a remaining maturity of 397 days or less. The Fund currently expects to gain exposures to certain types of investments principally through ETFs. The Fund may also lend its securities.

The Fund may engage in derivative transactions to seek return, to hedge against fluctuations in securities prices, interest rates or currency exchange rates, to change the effective duration of the fixed-income securities in its portfolio, to manage certain investment risks and/or as a substitute for the purchase or sale of securities, currencies or commodities. The Fund expects to use derivatives principally when seeking to gain exposure to equity or fixed-income securities using futures contracts on securities indices and/or when seeking to gain or reduce exposure to certain currencies by buying or selling forward foreign currency exchange contracts, but may also purchase or sell forwards or other types of futures contracts; options on futures contracts; exchange traded and over-the-counter options; equity collars, equity-linked securities and equity swap agreements; interest rate, total return, inflation and credit default swaps; forward rate agreements; and credit linked notes and other similarly structured products. The Fund may also engage in covered short sales (on individual securities held or on an index or basket of securities whose constituents are held in whole or in part or for which liquid assets have been segregated) and forward commitments. There is no stated limit on the Fund’s use of derivatives.

Risk [Heading]

rr_RiskHeading

Principal Risks

Risk Lose Money [Text]

rr_RiskLoseMoney

The Fund is not a complete investment program and you may lose money by investing in the Fund.

Bar Chart and Performance Table [Heading]

rr_BarChartAndPerformanceTableHeading

Performance

Performance Information Illustrates Variability of Returns [Text]

rr_PerformanceInformationIllustratesVariabilityOfReturns

The following bar chart and table provide some indication of the risks of investing in the Fund by showing how the Fund’s average annual total returns over time compare with those of two broad-based securities market indices.

Performance Past Does Not Indicate Future [Text]

rr_PerformancePastDoesNotIndicateFuture

Past performance (both before and after taxes) is no guarantee of future results.

Bar Chart Closing [Text Block]

rr_BarChartClosingTextBlock

During the period from December 31, 2011 through December 31, 2013 , the highest quarterly total return for Class A was 5.96 % for the quarter ended March 31, 2013 , and the lowest quarterly return was -0.94 % for the quarter ended June 30, 2013. The year-to-date total return through the end of the most recent calendar quarter (December 31, 2013 to September 30, 2014 ) was 2.33 %.

Bar Chart, Year to Date Return

rr_BarChartYearToDateReturn

2.33%

Highest Quarterly Return, Date

rr_BarChartHighestQuarterlyReturnDate

Mar. 31, 2013

Lowest Quarterly Return, Label

rr_LowestQuarterlyReturnLabel

and the lowest quarterly return was

Lowest Quarterly Return

rr_BarChartLowestQuarterlyReturn

(0.94%)

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 One Class of after Tax Shown [Text]

rr_PerformanceTableOneClassOfAfterTaxShown

After-tax returns for other Classes of shares will vary from the after-tax returns presented for Class A shares.

Performance Table Footnotes

rr_PerformanceTableFootnotesTextBlock

^* The blended index consists of 60% Barclays U.S. Aggregate Bond Index and 40% MSCI All Country World Index.

Trading Symbol

dei_TradingSymbol

EARAX

Maximum Deferred Sales Charge (Load) (as a percentage of the lower of net asset value at purchase or redemption)

rr_MaximumDeferredSalesChargeOverOther

none

Distribution and Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

0.25%

Acquired Fund Fees and Expenses

rr_AcquiredFundFeesAndExpensesOverAssets

0.07%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

709

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

1,297

Expense Example, No Redemption, 1 Year

rr_ExpenseExampleNoRedemptionYear01

709

Expense Example, No Redemption, 5 Years

rr_ExpenseExampleNoRedemptionYear05

rr_AnnualReturn2012

rr_AverageAnnualReturnYear01

6.94%

Trading Symbol

dei_TradingSymbol

ECRAX

Maximum Deferred Sales Charge (Load) (as a percentage of the lower of net asset value at purchase or redemption)

rr_MaximumDeferredSalesChargeOverOther

1.00%

Distribution and Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

1.00%

Acquired Fund Fees and Expenses

rr_AcquiredFundFeesAndExpensesOverAssets

0.07%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

318

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

1,154

Expense Example, No Redemption, 1 Year

rr_ExpenseExampleNoRedemptionYear01

218

Expense Example, No Redemption, 5 Years

rr_ExpenseExampleNoRedemptionYear05

1,154

1 Year

rr_AverageAnnualReturnYear01

11.57%

Trading Symbol

dei_TradingSymbol

EIRAX

Maximum Deferred Sales Charge (Load) (as a percentage of the lower of net asset value at purchase or redemption)

rr_MaximumDeferredSalesChargeOverOther

none

Distribution and Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

none

Acquired Fund Fees and Expenses

rr_AcquiredFundFeesAndExpensesOverAssets

0.07%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

118

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

638

Expense Example, No Redemption, 1 Year

rr_ExpenseExampleNoRedemptionYear01

118

Expense Example, No Redemption, 5 Years

rr_ExpenseExampleNoRedemptionYear05

638

1 Year

rr_AverageAnnualReturnYear01

13.80%

1 Year

rr_AverageAnnualReturnYear01

6.67%

1 Year

rr_AverageAnnualReturnYear01

4.15%

Index No Deduction for Fees, Expenses, Taxes [Text]

rr_IndexNoDeductionForFeesExpensesTaxes

(reflects no deduction for fees, expenses or taxes)

Life of Fund

rr_AverageAnnualReturnSinceInception

20.70%

[RiskReturnAbstract]

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

(2.02%)

Index No Deduction for Fees, Expenses, Taxes [Text]

rr_IndexNoDeductionForFeesExpensesTaxes

(reflects no deduction for fees, expenses or taxes)

Life of Fund

rr_AverageAnnualReturnSinceInception

8.99%

[RiskReturnAbstract]

rr_RiskReturnAbstract

Objective, Primary [Text Block]

rr_ObjectivePrimaryTextBlock

The Fund’s investment objective is to seek total return.

Expense Narrative [Text Block]

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 22 of this Prospectus and page 19 of the Fund’s Statement of Additional Information.

Operating Expenses Caption [Text]

rr_OperatingExpensesCaption

Annual Fund Operating Expenses (expenses you pay each year as a percentage of the value of your investment)

Portfolio Turnover [Text Block]

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 49 % of the average value of its portfolio.

Expense Breakpoint Discounts [Text]

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 22 of this Prospectus and page 19 of the Fund’s Statement of Additional Information.

Expense Example [Heading]

rr_ExpenseExampleHeading

Example.

Strategy [Heading]

rr_StrategyHeading

Principal Investment Strategies

Strategy Portfolio Concentration [Text]

rr_StrategyPortfolioConcentration

Under normal circumstances, the Fund invests at least 80% of its net assets (plus any borrowings for investment purposes) in equity securities and derivative instruments that provide exposure to equity securities (the “80% Policy”). The Fund may invest up to 20% of its net assets in fixed-income securities, including securities of any rating or that are unrated, and/or in currencies. The Fund may invest an unlimited amount of its assets in foreign securities located in developed or emerging market countries including frontier markets. Such investments may include securities denominated in foreign currencies and securities trading in the form of depositary receipts. The Fund may invest in stocks of companies of any capitalization, publicly traded real estate investment trusts and exchange-traded notes (“ETNs”). The Fund may invest in other pooled investment vehicles (including exchange-traded funds (“ETFs”) and other affiliated and unaffiliated mutual funds to the extent permitting by the Investment Company Act of 1940). The Fund may also lend its securities.

Risk Narrative [Text Block]

rr_RiskNarrativeTextBlock

Equity Investing Risk. The Fund’s shares may be sensitive to stock market volatility and the stocks in which the Fund invests may be more volatile than the stock market as a whole. The value of equity investments and related instruments may decline in response to conditions affecting the general economy; overall market changes; local, regional or global political, social or economic instability; and currency, interest rate and commodity price fluctuations, as well as issuer or sector specific events. 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 and although stock values can rebound, there is no assurance that values will return to previous levels.

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.

Foreign and Emerging Market Investment Risk. Because the Fund can invest a significant portion of its assets in foreign instruments, the value of Fund shares can 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. In emerging or less developed countries, these risks can be more significant. Investment markets in emerging market countries are typically substantially smaller, less liquid and more volatile than the major markets in developed countries. As a result, Fund share values may be more volatile than if the Fund invested only in developed markets. Emerging market countries may have relatively unstable governments and economies. Emerging market investments often are subject to speculative trading, which typically contributes to volatility. Trading in foreign and emerging markets typically involves higher expense than trading in the United States. The Fund may have difficulties enforcing its legal or contractual rights in a foreign country. The foregoing risks may be greater in frontier markets. 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 securities, including political, economic and market risks.

Currency Risk. In general, fluctuations in foreign currency values will result in fluctuations in the U.S. dollar value of Fund securities denominated in that foreign currency. If the U.S. dollar rises in value relative to a foreign currency, a security denominated in that foreign currency will be worth less in U.S. dollars. If the U.S. dollar decreases in value relative to a foreign currency, a security denominated in that foreign currency will be worth more in U.S. dollars. The value of foreign currencies as measured in U.S. dollars may be unpredictably affected by changes in foreign currency rates and exchange control regulations, application of foreign tax laws (including withholding tax), governmental administration of economic or monetary policies (in the U.S. or abroad), intervention (or the failure to intervene) by U.S. or foreign governments or central banks, and relations between nations. A devaluation of a currency by a country’s government or banking authority will have a significant impact on the value of any investments denominated in that currency. Currency markets generally are not as regulated as securities markets and currency transactions are subject to settlement, custodial and other operational risks. Exposure to foreign currencies through derivative instruments will be subject to derivative risks described herein.

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 in the Fund, which magnifies the Fund’s exposure to the underlying investment. 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, and the Fund could lose more than the principal amount invested. 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.

ETF Risk. Investing in an ETF exposes the Fund to all of the risks of that ETF’s investments and subjects it to a pro rata portion of the ETF’s fees and expenses. As a result, the cost of investing in ETF shares may exceed the costs of investing directly in its underlying investments. ETF shares trade on an exchange at a market price, which may vary from the ETF’s net asset value. The Fund may purchase ETFs at prices that exceed the net asset value of their underlying investments and may sell ETF investments at prices below such net asset value. Because the market price of ETF shares depends on the demand in the market for them, the market price of an ETF may be more volatile than the value of the underlying portfolio of securities the ETF is designed to track, and the Fund may not be able to liquidate ETF holdings at the time and price desired, which may impact Fund performance.

Real Estate Investment Trust Risk. Real estate investment trusts (“REITs”) are subject to special risks associated with real estate. Securities of companies in the real estate industry are sensitive to factors such as changes in real estate values, property taxes, interest rates, cash flow of underlying real estate assets, occupancy rates, government regulations affecting zoning, land use, and rents, and the management skill and creditworthiness of the issuer. Companies in the real estate industry may also be subject to liabilities under environmental and hazardous waste laws, among others. Changes in underlying real estate values may have an exaggerated effect to the extent that REITs concentrate investments in particular geographic regions or property types.

Fixed-Income Securities Risk. If the Fund invests in fixed-income securities, the Fund’s shares may be sensitive to increases in prevailing interest rates and the creditworthiness of issuers. An imbalance in supply and demand in the fixed-income market may result in valuation uncertainties and greater volatility, less liquidity, widening credit spreads and a lack of price transparency in the market. Investments rated below investment grade and comparable unrated securities have speculative characteristics because of the credit risk associated with their issuers. Changes in economic conditions or other circumstances typically have a greater effect on the ability of issuers of lower rated investments to make principal and interest payments than they do on issuers of higher rated investments. An economic downturn generally leads to a higher non-payment rate, and a lower rated investment may lose significant value before a default occurs. Lower rated investments generally are subject to greater price volatility and illiquidity than higher rated investments.

Risks of Commodity-Related Investments. The value of commodity investments will generally be affected by overall market movements and factors specific to a particular industry or commodity, which may include weather, embargoes, tariffs, and health, political, international and regulatory developments. Economic and other events (whether real or perceived) can reduce the demand for commodities, which may reduce market prices and cause the value of the Fund’s commodity investments to fall. The frequency and magnitude of such changes cannot be predicted. Exposure to commodities and commodity markets may subject the Fund to greater volatility than investments in traditional securities. No active trading market may exist for certain commodity investments, which may impair the ability of the Fund to sell or to realize the full value of such investments in the event of the need to liquidate such investments and/or shares of an ETF that invests in such investments. In addition, adverse market conditions may impair the liquidity of actively traded commodity investments. Certain types of commodity instruments (such as total return swaps and commodity-linked notes) are subject to the risk that the counterparty to the instrument will not perform or will be unable to perform in accordance with the terms of the instrument.

Securities Lending Risk. Securities lending involves possible delay in recovery of the securities or possible loss of rights in the collateral should the borrower fail financially. As a result, the value of Fund shares may fall and there may be a delay in recovering the loaned securities. The value of Fund shares could also fall if a loan is called and the Fund is required to liquidate reinvested collateral at a loss or if the sub-adviser is unable to reinvest cash collateral at rates that exceed the costs involved.

Risks Associated with Active and Quantitative Management. The Fund is an actively managed portfolio and its success depends upon the ability of the sub-adviser to develop and effectively implement strategies to achieve the Fund’s investment objective. Subjective decisions may cause the Fund to incur losses or to miss profit opportunities on which it may otherwise have capitalized. The sub-adviser uses quantitative investment techniques and analyses in making investment decisions for the Fund. There can be no assurance that these techniques will achieve the desired results.

General Fund Investing Risks. The Fund is not a complete investment program and you may lose money by investing in the Fund. All investments carry a certain amount of risk and there is no guarantee that the Fund will be able to achieve its investment objective. 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 Not Insured Depository Institution [Text]

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.

Performance Narrative [Text Block]

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. Updated Fund performance information can be obtained by visiting www.eatonvance.com.

Performance Availability Website Address [Text]

rr_PerformanceAvailabilityWebSiteAddress

www.eatonvance.com

Bar Chart Does Not Reflect Sales Loads [Text]

rr_BarChartDoesNotReflectSalesLoads

The return in the bar chart is for Class A shares and does not reflect a sales charge. If the sales charge was reflected, the return would be lower.

Bar Chart, Year to Date Return, Date

rr_BarChartYearToDateReturnDate

Sep. 30, 2014

Highest Quarterly Return, Label

rr_HighestQuarterlyReturnLabel

During the period from December 31, 2010 through December 31, 2013 , the highest quarterly total return for Class A was

Highest Quarterly Return

rr_BarChartHighestQuarterlyReturn

10.78%

Lowest Quarterly Return, Date

rr_BarChartLowestQuarterlyReturnDate

Sep. 30, 2011

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 C.

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 Explanation after Tax Higher

rr_PerformanceTableExplanationAfterTaxHigher

Return After Taxes on Distributions for a period 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 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.

Trading Symbol

dei_TradingSymbol

ERBAX

Maximum Deferred Sales Charge (Load) (as a percentage of the lower of net asset value at purchase or redemption)

rr_MaximumDeferredSalesChargeOverOther

none

Distribution and Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

0.25%

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

1.26%

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

952

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

2,010

Expense Example, No Redemption, 3 Years

rr_ExpenseExampleNoRedemptionYear03

952

Expense Example, No Redemption, 10 Years

rr_ExpenseExampleNoRedemptionYear10

rr_AnnualReturn2012

rr_AverageAnnualReturnYear01

22.07%

Trading Symbol

dei_TradingSymbol

ERBCX

Maximum Deferred Sales Charge (Load) (as a percentage of the lower of net asset value at purchase or redemption)

rr_MaximumDeferredSalesChargeOverOther

1.00%

Distribution and Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

1.00%

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

2.01%

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

630

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

2,338

Expense Example, No Redemption, 3 Years

rr_ExpenseExampleNoRedemptionYear03

630

Expense Example, No Redemption, 10 Years

rr_ExpenseExampleNoRedemptionYear10

2,338

Life of Fund

rr_AverageAnnualReturnSinceInception

11.44%

[RiskReturnAbstract]

rr_RiskReturnAbstract

Maximum Sales Charge (Load) (as a percentage of offering price)

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

none

Management Fees

rr_ManagementFeesOverAssets

0.88%

Other Expenses

rr_OtherExpensesOverAssets

0.13%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

103

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

558

Expense Example, No Redemption, 1 Year

rr_ExpenseExampleNoRedemptionYear01

103

Expense Example, No Redemption, 5 Years

rr_ExpenseExampleNoRedemptionYear05

558

1 Year

rr_AverageAnnualReturnYear01

29.90%

1 Year

rr_AverageAnnualReturnYear01

21.94%

1 Year

rr_AverageAnnualReturnYear01

12.60%

Index No Deduction for Fees, Expenses, Taxes [Text]

rr_IndexNoDeductionForFeesExpensesTaxes

(reflects no deduction for fees, expenses or taxes)

Life of Fund

rr_AverageAnnualReturnSinceInception

11.07%

[RiskReturnAbstract]

rr_RiskReturnAbstract

Objective, Primary [Text Block]

rr_ObjectivePrimaryTextBlock

The Fund’s investment objective is to seek long-term capital growth by investing in a worldwide and diversified portfolio of health sciences companies.

Expense Narrative [Text Block]

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 15 of this Prospectus and page 21 of the Fund’s Statement of Additional Information.

Operating Expenses Caption [Text]

rr_OperatingExpensesCaption

Annual Fund Operating Expenses (expenses you pay each year as a percentage of the value of your investment)*

Portfolio Turnover [Text Block]

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 57 % of the average value of its portfolio.

Expense Footnotes [Text Block]

rr_ExpenseFootnotesTextBlock

* Expenses in the table above and the Example below reflect the expenses of the Fund and Worldwide Health Sciences Portfolio (the “Portfolio”), the Fund’s master Portfolio.

Expense Breakpoint, Minimum Investment Required [Amount]

rr_ExpenseBreakpointMinimumInvestmentRequiredAmount

50,000

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 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:

Strategy Narrative [Text Block]

rr_StrategyNarrativeTextBlock

The Fund normally invests at least 80% of its net assets (plus any borrowings for investment purposes) in securities (primarily common stocks) of companies principally engaged in the discovery, development, production or distribution of products (or services) related to scientific advances in health care, including biotechnology, pharmaceuticals, diagnostics, managed health care and medical equipment and supplies (“health sciences companies”) (the “80% Policy”). A company will be considered to be a health sciences company if, at the time of investment, 50% or more of the company’s sales, earnings or assets will arise from or will be dedicated to the application of scientific advances related to health care. The Fund invests in U.S. and foreign securities and will normally be invested in issuers located in at least three different countries. The Fund may invest in securities of both larger established and smaller emerging companies located in developed or emerging markets, some of which may be denominated in foreign currencies or trade in the form of depositary receipts. The Fund concentrates (that is, invests at least 25% of its assets) its investments in medical research and the health care industry. The Fund may invest up to 5% of its total assets in royalty bonds. The Fund may also invest in other pooled investment vehicles (including exchange-traded funds (“ETFs”) and other affiliated and unaffiliated mutual funds to the extent permitted by the Investment Company Act of 1940).

The portfolio managers seek to purchase stocks that are reasonably priced in relation to their fundamental value, and that the adviser believes will grow in value over time regardless of short-term market fluctuations. In making investment decisions, the portfolio managers utilize the information provided by, and the expertise of, the investment adviser’s research staff. The stock selection process will be based on numerous factors, including the potential to increase market share (for larger companies), and the potential of research and development projects (for smaller companies). The portfolio managers consider selling a holding whenever they add a holding to the Fund. The stock selection process is highly subjective.

The Fund currently invests its assets in the Portfolio, a separate registered investment company with the same investment objective and policies as the Fund.

Risk [Heading]

rr_RiskHeading

Principal Risks

Risk Lose Money [Text]

rr_RiskLoseMoney

The Fund is not a complete investment program and you may lose money by investing in the Fund.

Bar Chart and Performance Table [Heading]

rr_BarChartAndPerformanceTableHeading

Performance

Performance Information Illustrates Variability of Returns [Text]

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 two broad-based securities market indices.

Performance Past Does Not Indicate Future [Text]

rr_PerformancePastDoesNotIndicateFuture

Past performance (both before and after taxes) is no guarantee of future results.

Bar Chart Closing [Text Block]

rr_BarChartClosingTextBlock

For the ten years ended December 31, 2013 , the highest quarterly total return for Class A was 14.87 % for the quarter ended March 31, 2013 , and the lowest quarterly return was –11.72% for the quarter ended September 30, 2011. The year-to-date total return through the end of the most recent calendar quarter (December 31, 2013 to September 30, 2014 ) was 18.77 %.

Bar Chart, Year to Date Return

rr_BarChartYearToDateReturn

18.77%

Highest Quarterly Return, Date

rr_BarChartHighestQuarterlyReturnDate

Mar. 31, 2013

Lowest Quarterly Return, Label

rr_LowestQuarterlyReturnLabel

and the lowest quarterly return was

Lowest Quarterly Return

rr_BarChartLowestQuarterlyReturn

(11.72%)

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 One Class of after Tax Shown [Text]

rr_PerformanceTableOneClassOfAfterTaxShown

After-tax returns for other Classes of shares will vary from the after-tax returns presented for Class A shares.

Performance Table Footnotes, Reason Performance Information for Class Different from Immediately Preceding Period [Text]

rr_PerformanceTableFootnotesReasonPerformanceInformationForClassDifferentFromImmediatelyPrecedingPeriod

The Class I and Class R performance shown above for the periods prior to October 1, 2009 and September 8, 2003 (commencement of operations for such class, respectively) 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.

Trading Symbol

dei_TradingSymbol

ETHSX

Maximum Deferred Sales Charge (Load) (as a percentage of the lower of net asset value at purchase or redemption)

rr_MaximumDeferredSalesChargeOverOther

none

Distribution and Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

0.25%

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

1.46%

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

1,010

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

2,221

Expense Example, No Redemption, 3 Years

rr_ExpenseExampleNoRedemptionYear03

1,010

Expense Example, No Redemption, 10 Years

rr_ExpenseExampleNoRedemptionYear10

rr_AnnualReturn2005

rr_AnnualReturn2007

rr_AnnualReturn2009

rr_AnnualReturn2011

rr_AnnualReturn2013

rr_AverageAnnualReturnYear05

15.00%

Trading Symbol

dei_TradingSymbol

EMHSX

Maximum Deferred Sales Charge (Load) (as a percentage of the lower of net asset value at purchase or redemption)

rr_MaximumDeferredSalesChargeOverOther

5.00%

Distribution and Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

1.00%

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

2.21%

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

1,091

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

2,355

Expense Example, No Redemption, 3 Years

rr_ExpenseExampleNoRedemptionYear03

691

Expense Example, No Redemption, 10 Years

rr_ExpenseExampleNoRedemptionYear10

2,355

5 Years

rr_AverageAnnualReturnYear05

15.30%

Trading Symbol

dei_TradingSymbol

ECHSX

Maximum Deferred Sales Charge (Load) (as a percentage of the lower of net asset value at purchase or redemption)

rr_MaximumDeferredSalesChargeOverOther

1.00%

Distribution and Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

1.00%

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

2.21%

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

691

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

2,544

Expense Example, No Redemption, 3 Years

rr_ExpenseExampleNoRedemptionYear03

691

Expense Example, No Redemption, 10 Years

rr_ExpenseExampleNoRedemptionYear10

2,544

5 Years

rr_AverageAnnualReturnYear05

15.50%

Trading Symbol

dei_TradingSymbol

EIHSX

Maximum Deferred Sales Charge (Load) (as a percentage of the lower of net asset value at purchase or redemption)

rr_MaximumDeferredSalesChargeOverOther

none

Distribution and Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

none

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

1.21%

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

384

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

1,466

Expense Example, No Redemption, 3 Years

rr_ExpenseExampleNoRedemptionYear03

384

Expense Example, No Redemption, 10 Years

rr_ExpenseExampleNoRedemptionYear10

1,466

5 Years

rr_AverageAnnualReturnYear05

16.61%

Trading Symbol

dei_TradingSymbol

ERHSX

Maximum Deferred Sales Charge (Load) (as a percentage of the lower of net asset value at purchase or redemption)

rr_MaximumDeferredSalesChargeOverOther

none

Distribution and Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

0.50%

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

1.71%

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

539

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

2,019

Expense Example, No Redemption, 3 Years

rr_ExpenseExampleNoRedemptionYear03

539

Expense Example, No Redemption, 10 Years

rr_ExpenseExampleNoRedemptionYear10

2,019

5 Years

rr_AverageAnnualReturnYear05

16.07%

1 Year

rr_AverageAnnualReturnYear01

32.21%

10 Years

rr_AverageAnnualReturnYear10

7.18%

[RiskReturnAbstract]

rr_RiskReturnAbstract

5 Years

rr_AverageAnnualReturnYear05

11.93%

Index No Deduction for Fees, Expenses, Taxes [Text]

rr_IndexNoDeductionForFeesExpensesTaxes

(reflects no deduction for fees, expenses or taxes)

5 Years

rr_AverageAnnualReturnYear05

17.93%

Index No Deduction for Fees, Expenses, Taxes [Text]

rr_IndexNoDeductionForFeesExpensesTaxes

(reflects net dividends, which reflect the deduction of withholding taxes)

5 Years

rr_AverageAnnualReturnYear05

16.36%

Objective [Heading]

rr_ObjectiveHeading

Investment Objective

Expense [Heading]

rr_ExpenseHeading

Fees and Expenses of the Fund

Portfolio Turnover [Heading]

rr_PortfolioTurnoverHeading

Portfolio Turnover

Portfolio Turnover, Rate

rr_PortfolioTurnoverRate

101.00%

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 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:

Strategy Narrative [Text Block]

rr_StrategyNarrativeTextBlock

The Fund seeks its objective of total return utilizing a balanced risk asset allocation strategy. The strategy intends to incorporate investments representing a broad spectrum of asset classes which may include, but is not limited to: global equity, real estate, credit spreads, nominal bonds, inflation bonds, commodities and/or precious metals. The Fund does not have a fixed asset class risk allocation and at times may not have any exposure to one or more of the foregoing asset classes. Implementation of the strategy generally involves obtaining leveraged exposure through derivatives to asset classes that have historically exhibited relatively low levels of volatility.

The Fund utilizes a variety of instruments to gain exposure to asset classes, including, but not limited to: interest rate futures; equity index futures and options; sovereign government fixed-income futures and options; commodity futures and options; CBOE VIX index futures and options; currency futures and forward currency contracts; sovereign government fixed-income securities; exchange-traded notes (“ETNs”); exchange-traded funds (“ETFs”) and options on ETFs; over-the-counter total return, interest rate and commodity swaps; inflation-linked securities , real estate investment trusts (“REITs”) and repurchase agreements. The Fund may engage in derivative transactions to seek total return; to hedge against fluctuations in securities prices, interest rates or currency exchange rates; to change the effective duration of its portfolio; to manage certain investment risks; for speculation purposes to gain certain types of exposures; and/or as a substitute for the purchase or sale of securities, currencies or commodities. The Fund’s use of derivatives may be extensive. There is no stated limit on the Fund’s use of derivatives. The Fund may utilize short sales for the purpose of hedging within the overall portfolio structure and may engage in securities lending. The Fund may gain exposures to certain types of investments through ETFs and may invest in certain ETFs beyond the limits under the Investment Company Act of 1940, subject to certain terms and conditions. The Fund has no geographic limits on where its investments may be located or where its assets may be exposed.

The Fund employs a risk parity investment approach. A risk parity investment approach seeks to spread portfolio risk across diverse asset classes, with the objective of creating a portfolio that is generally more balanced and may achieve higher risk-adjusted returns than a traditional asset allocation approach (e.g., a portfolio invested 60% in equities and 40% in fixed-income). There can be no assurance that employing a risk parity approach will achieve any particular level of return or will reduce volatility or potential loss compared to other investment approaches.

In implementing the Fund’s strategy, the portfolio managers generally seek to maintain a balanced exposure to risk allocations through all phases of an economic cycle, with periodic rebalancing of asset class exposures if they move outside established thresholds. Target notional exposures to any specific asset class will reflect the anticipated contribution of such asset class to the Fund’s overall risk based on its expected volatility as well as its contribution to diversification.

Under normal market conditions, the portfolio managers target Fund volatility of approximately 10% annually. Volatility is measured by the standard deviation of expected total returns of the Fund. The Fund’s actual, or realized, volatility for longer or shorter periods may be materially higher or lower than the target, depending on market conditions.

The Fund may gain exposure to commodities by investing in PBR Commodity Subsidiary, Ltd. (the “Subsidiary”), a wholly-owned subsidiary of the Fund organized in the Cayman Islands, which invests primarily in commodity-related instruments, as well as securities and other instruments in which the Fund is permitted to invest.

Risk Narrative [Text Block]

rr_RiskNarrativeTextBlock

Market Risk. Economic and other events (whether real or perceived) can reduce the demand for investments held by the Fund, which may reduce their market prices and cause the value of Fund shares to fall. The frequency and magnitude of such changes cannot be predicted. Certain securities and other investments held by the Fund can experience downturns in trading activity and, at such times, the supply of such instruments in the market may exceed the demand. At other times, the demand for such instruments may exceed the supply in the market. An imbalance in supply and demand in the market may result in valuation uncertainties and greater volatility, less liquidity, wider trading spreads and a lack of price transparency in the market. No active trading market may exist for certain investments, which may impair the ability of the Fund to sell or to realize the full value of such investments in the event of the need to liquidate such assets. Adverse market conditions may impair the liquidity of some actively traded investments. Fixed income markets have recently experienced a period of relatively high volatility. If the Federal Reserve continues to taper or reverses its quantitative easing stimulus program and/or increases interest rates, fixed income markets could experience continuing high volatility, which could negatively impact the Fund’s performance.

Equity Investing Risk. The Fund’s shares may be sensitive to stock market volatility. The value of equity investments and related instruments may decline in response to conditions affecting the general economy; overall market changes; local, regional or global political, social or economic instability; and currency, interest rate and commodity price fluctuations, as well as issuer or sector specific events. Although values can rebound, there is no assurance they will return to previous levels.

Credit Risk. Investments in debt obligations are subject to the risk of non-payment of scheduled principal and interest. Changes in economic conditions or other circumstances may reduce the capacity of the party obligated to make principal and interest payments on such instruments and may lead to defaults. Such non-payments and defaults may reduce the value of Fund shares and income distributions. The value of a debt obligation also may decline because of concerns about the issuer’s ability to make principal and interest payments. In addition, the credit ratings of fixed income securities and other debt instruments may be lowered if the financial condition of the party obligated to make payments with respect to such instruments changes. Credit ratings assigned by rating agencies are based on a number of factors and do not necessarily reflect the issuer’s current financial condition or the volatility or liquidity of the security. In the event of bankruptcy of the issuer of fixed income securities and other debt instruments, the Fund could experience delays or limitations with respect to its ability to realize the benefits of any collateral securing the instrument. In order to enforce its rights in the event of a default, bankruptcy or similar situation, the Fund may be required to retain legal or similar counsel. This may increase the Fund’s operating expenses and adversely affect net asset value.

Securities Lending Risk. Securities lending involves possible delay in recovery of the securities or possible loss of rights in the collateral should the borrower fail financially. As a result, the value of Fund shares may fall and there may be a delay in recovering the loaned securities. The value of Fund shares could also fall if a loan is called and the Fund is required to liquidate reinvested collateral at a loss or if the sub-adviser is unable to reinvest cash collateral at rates that exceed the costs involved.

Risks of Commodity-Related Investments. The value of commodity investments will generally be affected by overall market movements and factors specific to a particular industry or commodity, which may include weather, embargoes, tariffs, and health, political, international and regulatory developments. Economic and other events (whether real or perceived) can reduce the demand for commodities, which may reduce market prices and cause the value of the Fund’s commodity investments to fall. The frequency and magnitude of such changes cannot be predicted. Exposure to commodities and commodity markets may subject the Fund to greater volatility than investments in traditional securities. No active trading market may exist for certain commodity investments, which may impair the ability of the Fund to sell or to realize the full value of such investments in the event of the need to liquidate such investments. In addition, adverse market conditions may impair the liquidity of actively traded commodity investments. Certain types of commodity instruments (such as total return swaps and commodity-linked notes) are subject to the risk that the counterparty to the instrument will not perform or will be unable to perform in accordance with the terms of the instrument. As noted under “Principal Investment Strategies,” the Fund expects to gain a significant portion of its commodity-related exposures by investing in the Subsidiary. See “Subsidiary Risk” and “Tax Risk.”

Foreign and Emerging Market Investment Risk. Because the Fund may invest a significant portion of its assets in foreign instruments, the value of Fund shares can 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. In emerging or less developed countries, these risks can be more significant. Investment markets in emerging market countries are typically substantially smaller, less liquid and more volatile than the major markets in developed countries. As a result, Fund share values may be more volatile than if the Fund invested only in developed markets. Emerging market countries may have relatively unstable governments and economies. Emerging market investments often are subject to speculative trading, which typically contributes to volatility. Trading in foreign and emerging markets typically involves higher expense than trading in the United States. The Fund may have difficulties enforcing its legal or contractual rights in a foreign country. The value of investments denominated in foreign currencies can be adversely affected by changes in foreign currency exchange rates.

Economic data as reported by sovereign governments and foreign issuers may be delayed, inaccurate or fraudulent. In the event of a default by a sovereign entity, there are typically no assets to be seized or cash flows to be attached. Furthermore, the willingness or ability of a sovereign entity to renegotiate defaulted debt may be limited. Therefore, losses on sovereign defaults may far exceed the losses from the default of a similarly rated U.S. debt issuer.

Currency Risk. In general, fluctuations in foreign currency values will result in fluctuations in the U.S. dollar value of securities denominated in that foreign currency. If the U.S. dollar rises in value relative to a foreign currency, a security denominated in that currency will be worth less in U.S. dollars. If the U.S. dollar decreases in value relative to a foreign currency, a security denominated in that currency will be worth more in U.S. dollars. The value of foreign currencies as measured in U.S. dollars may be unpredictably affected by changes in foreign currency rates and exchange control regulations, application of foreign tax laws (including withholding tax), governmental administration of economic or monetary policies (in the U.S. or abroad), intervention (or the failure to intervene) by U.S. or foreign governments or central banks, and relations between nations. A devaluation of a currency by a country’s government or banking authority will have a significant impact on the value of any investments denominated in that currency. Currency markets generally are not as regulated as securities markets and currency transactions are subject to settlement, custodial and other operational risks. Exposure to foreign currencies through derivative instruments will be subject to derivative risks described herein.

Interest Rate Risk. In general, the value of income securities will fluctuate based on changes in interest rates. The value of these securities is likely to increase when interest rates fall and decline when interest rates rise. Generally, securities with longer durations are more sensitive to changes in interest rates than shorter duration securities. In a rising interest rate environment, the duration of income securities that have the ability to be prepaid or called by the issuer may be extended. In a declining interest rate environment, the proceeds from prepaid or maturing instruments may have to be reinvested at a lower interest rate.

Inflation-Linked Security Risk. Inflation-linked debt securities are subject to the effects of changes in market interest rates caused by factors other than inflation (real interest rates). In general, the price of an inflation-linked security tends to decrease when real interest rates increase and increase when real interest rates decrease. Interest payments on inflation-linked securities may vary widely and will fluctuate as the principal and interest are adjusted for inflation. Any increase in the principal amount of an inflation-linked debt security will be considered taxable ordinary income, even though the Fund will not receive the principal until maturity. There can be no assurance that the inflation index used will accurately measure the real rate of inflation in the prices of goods and services. The Fund’s investments in inflation-linked securities may lose value in the event that the actual rate of inflation is different than the rate of the inflation index.

Real Estate Investing Risk. Real estate-related investments are sensitive to factors such as changes in real estate values, property taxes, interest rates, cash flow of underlying real estate assets, occupancy rates, government regulations affecting zoning, land use, and rents, and the management skill and creditworthiness of the issuer. Companies in the real estate industry may also be subject to liabilities under environmental and hazardous waste laws, among others. REITs are subject to the special risks associated with investing in the real estate industry. Changes in underlying real estate values may have an exaggerated effect to the extent that REITs concentrate investments in particular geographic regions or property types.

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 in the Fund, which magnifies the Fund’s exposure to the underlying investment. 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. The use of 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, and the Fund could lose more than the principal amount invested. 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.

Risk of Leveraged Transactions. The Fund will engage in transactions and make investments that give rise to leverage. Such transactions may include, among others, borrowing, securities lending, short sales and certain derivative transactions. The Fund is required to segregate liquid assets or otherwise cover the Fund’s obligation created by a transaction that may give rise to leverage. The use of leverage may cause the Fund to liquidate portfolio positions when it may not be advantageous to do so to satisfy its obligations or to meet segregation requirements. Leverage may cause the Fund’s share price to be more volatile than if it had not been leveraged, as certain types of leverage may exaggerate the effect of any increase or decrease in the value of the Fund’s portfolio securities. The loss on leveraged investments may substantially exceed the initial investment.

Management Risk. The Fund seeks to balance risk across multiple asset classes based on the long-term historical volatility of such asset classes. The strategy has not been independently tested or validated, and there can be no assurance that it will achieve the desired results. To the extent that the actual volatility of an asset class differs from its historical performance, the Fund may not perform as intended.

Volatility Risk. The value of assets held by the Fund may increase or decrease significantly over short periods of time. This may cause the Fund’s net asset value per share to experience similar changes in value over the short term.

ETF Risk. Investing in an ETF exposes the Fund to all of the risks of that ETF’s investments and subjects it to a pro rata portion of the ETF’s fees and expenses. As a result, the cost of investing in ETF shares may exceed the costs of investing directly in its underlying investments. ETF shares trade on an exchange at a market price, which may vary from the ETF’s net asset value. The Fund may purchase ETFs at prices that exceed the net asset value of their underlying investments and may sell ETF investments at prices below such net asset value. Because the market price of ETF shares depends on the demand in the market for them, the market price of an ETF may be more volatile than the value of the underlying portfolio of securities the ETF is designed to track, and the Fund may not be able to liquidate ETF holdings at the time and price desired, which may impact Fund performance.

ETN Risk. ETNs are debt obligations and their payments of interest or principal are linked to the performance of a reference investment (typically an index). ETNs are subject to the performance of their issuer and may lose all or a portion of their entire value if the issuer fails or its credit rating changes. An ETN that is tied to a specific index may not be able to replicate and maintain exactly the composition and weighting of the components of that index. ETNs also incur certain expenses not incurred by the reference investment and the cost of owning an ETN may exceed the cost of investing directly in the reference investment. The market trading price of an ETN may be more volatile than the reference investment it is designed to track. The Fund may purchase an ETN at prices that exceed its net asset value and may sell such investments at prices below such net asset value. The Fund may not be able to liquidate ETN holdings at the time and price desired, which may impact Fund performance.

Risks of Repurchase Agreements. In the event of the insolvency of the counterparty to a repurchase agreement, recovery of the repurchase price owed to the Fund may be delayed. Such an insolvency also may result in a loss to the extent that the value of the purchased securities decreases during the delay or that value has otherwise not been maintained at an amount at least equal to the repurchase price.

Short Sale Risk. Short sale risks include, among others, the potential loss of more money than the actual cost of the investment, and the risk that the third party to the short sale may fail to honor its contract terms, causing a loss to the Fund.

Subsidiary Risk. The Fund will be exposed to the risks associated with the Subsidiary’s investments. The Subsidiary invests in commodity-related investments, as well as securities and other instruments in which the Fund is permitted to invest. The Subsidiary is subject to the laws of the Cayman Islands and is not subject to U.S. laws, including securities laws and their protections and provisions of the Internal Revenue Code. Because the Subsidiary is not registered under the Investment Company Act of 1940, it may not be able to negotiate terms with its counterparties that are equivalent to those a registered fund may negotiate. As a result, the Subsidiary may have greater exposure to those counterparties than a registered fund. Changes in the laws of the United States and/or the Cayman Islands could result in the inability of the Subsidiary to operate as described in the Fund's Prospectus and Statement of Additional Information, and could adversely affect the Fund’s investment approach.

Tax Risk. In order for the Fund to qualify as a regulated investment company under Subchapter M of the Internal Revenue Code (the “Code”), the Fund must derive at least 90 percent of its gross income each taxable year from certain qualifying sources of income. Commodity-related investments generate income that is not from a qualified source for purposes of meeting this 90 percent test. Numerous mutual funds have obtained private letter rulings from the Internal Revenue Service (“IRS”) that provide that income produced by certain types of commodity-linked notes or wholly-owned subsidiaries (like the Subsidiary) constitute qualifying income. The Fund has received advice from counsel that income from certain commodity-linked notes should be qualifying income and that income derived from the Subsidiary should also constitute qualifying income. Should the IRS take action that adversely affects the tax treatment of investing in commodity-linked notes or the Subsidiary, it could limit the Fund’s ability to invest in commodity-related investments, and the Fund may incur transaction and other costs to comply with any new or additional guidance from the IRS. The tax treatment of commodity-related investments and income from the Subsidiary may be adversely affected by future legislation, Treasury Regulations and/or guidance issued by the IRS that could affect the character, timing and/or amount of the Fund’s taxable income or any gains and distributions made by the Fund.

General Fund Investing Risks. The Fund is not a complete investment program and you may lose money by investing in the Fund. All investments carry a certain amount of risk and there is no guarantee that the Fund will be able to achieve its investment objective. 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.

Performance Narrative [Text Block]

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Performance history will be available for the Fund after the Fund has been in operation for one full calendar year.