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Label Element Value
Risk/Return: rr_RiskReturnAbstract  
ProspectusDate rr_ProspectusDate Jan. 01, 2012
Dreyfus Brazil Equity Fund (Prospectus Summary) | Dreyfus Brazil Equity Fund
  
Risk/Return: rr_RiskReturnAbstract  
Risk/Return, Heading rr_RiskReturnHeading Fund Summary
Investment Objective, Heading rr_ObjectiveHeading Investment Objective
investment Objective, Primary rr_ObjectivePrimaryTextBlock 
The fund seeks long-term capital growth.
Expense, Heading rr_ExpenseHeading Fees and Expenses
Expense, Narrative rr_ExpenseNarrativeTextBlock 
This table describes the fees and expenses that you may pay if you buy and hold
shares of the fund. You may qualify for sales charge discounts if you and your
family invest, or agree to invest in the future, at least $50,000 in certain
funds in the Dreyfus Family of Funds. More information about these and other
discounts is available from your financial professional and in the Shareholder
Guide section on page 11 of the Prospectus and in the How to Buy Shares section
and the Additional Information About How to Buy Shares section on page II-1 and
page III-1, respectively, of the fund's Statement of Additional Information.
Class A shares bought without an initial sales charge as part of an investment
of $1 million or more may be charged a deferred sales charge of 1.00% if
redeemed within one year.
Shareholder Fees, Caption rr_ShareholderFeesCaption Shareholder Fees (fees paid directly from your investment)
Operating Expenses, Caption rr_OperatingExpensesCaption Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)
Portfolio Turnover, Heading rr_PortfolioTurnoverHeading Portfolio Turnover
Portfolio Turnover rr_PortfolioTurnoverTextBlock 
The fund pays transaction costs, such as commissions, when it buys and sells
securities (or "turns over" its portfolio). A higher portfolio turnover may
indicate higher transaction costs and may result in higher taxes when fund
shares are held in a taxable account. These costs, which are not reflected in
annual fund operating expenses or in the example, affect the fund's performance.
During the most recent fiscal year, the fund's portfolio turnover rate was
49.44% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 49.44%
Expense Breakpoint, Discounts rr_ExpenseBreakpointDiscounts You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $50,000 in certain funds in the Dreyfus Family of Funds.
Expense Breakpoint, Minimum Investment Required Amount rr_ExpenseBreakpointMinimumInvestmentRequiredAmount 50,000
Expense Example, Heading rr_ExpenseExampleHeading Example
Expense Example, Narrative rr_ExpenseExampleNarrativeTextBlock 
The 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 fund's operating expenses
remain the same. Although your actual costs may be higher or lower, based on
these assumptions your costs would be:
Expense Example, No Redemption, By Year, Caption rr_ExpenseExampleNoRedemptionByYearCaption You would pay the following expenses if you did not redeem your shares:
Investment Strategy, Heading rr_StrategyHeading Principal Investment Strategy
Investment Strategy, Narrative rr_StrategyNarrativeTextBlock 
To pursue its goal, the fund normally invests at least 80% of its net assets,
plus any borrowings for investment purposes, in equity securities of companies:
(i) that have their registered office in Brazil; (ii) whose principal trading
market is in Brazil; or (iii) that have a majority of their assets, or that
derive a significant portion of their revenue or profits from businesses,
investments or sales, in Brazil. The fund may invest in the stocks of companies
of any size, although it focuses on large and mid-cap companies (generally, with
market capitalizations of $2 billion or more at the time of purchase). The
fund's sub-investment adviser seeks investment opportunities in companies with
sustainable earnings, attractive valuations and high dividend yields that
indicate the potential for strong sustainable capital growth. The sub-adviser
constructs the fund's portfolio through a combination of quantitative and
fundamental bottom-up research, and an understanding of local/regional
macroeconomic trends. In selecting securities, the fund's portfolio managers use
a three-step investment process consisting of: (1) quantitative analysis, (2)
fundamental analysis and (3) portfolio construction.
Risk, Heading rr_RiskHeading Principal Risks
Risk, Narrative rr_RiskNarrativeTextBlock 
An investment in the fund is not a bank deposit. It is not insured or guaranteed
by the Federal Deposit Insurance Corporation (FDIC) or any other government
agency. It is not a complete investment program. The fund's share price
fluctuates, sometimes dramatically, which means you could lose money.

o Risks of concentrating investments in Brazil. The fund's performance will be
  influenced by political, social and economic factors affecting Brazil. Special
  risks include exposure to currency fluctuations, less liquidity, less developed
  or efficient trading markets, lack of comprehensive company information,
  political instability and differing accounting and legal standards. Because the
  fund's investments are concentrated in Brazil, the fund's performance could be
  more volatile than that of more geographically diversified funds.

As an emerging market, the Brazilian market tends to be more volatile than the
markets of more mature economies, and generally has a less diverse and less
mature economic structure and a less stable political system than those of
developed countries. Certain political, economic, legal and currency risks have
contributed to a high level of price volatility in the Brazilian equity and
currency markets and could adversely affect investments in the fund. Brazil has
historically experienced high rates of inflation and may continue to do so.
Inflationary pressures may slow the rate of growth of the Brazilian economy and
may lead to further government intervention in the economy, which could
adversely affect the fund's investments. Brazil continues to suffer from chronic
structural public sector deficits. Unanticipated political or social
developments may result in increased volatility in the fund's share price and
sudden and significant investment losses.

o Foreign currency risk. Investments in foreign currencies are subject to the
  risk that those currencies will decline in value relative to the U.S. dollar,
  which will reduce the value of investments denominated in those currencies held
  by the fund.

o Risks of stock investing. Stocks generally fluctuate more in value than bonds
  and may decline significantly over short time periods. There is the chance that
  stock prices overall will decline because stock markets tend to move in cycles,
  with periods of rising prices and falling prices. The market value of a stock
  may decline due to general weakness in the stock market or because of factors
  that affect the company or its particular industry.

o Liquidity risk. When there is little or no active trading market for specific
  types of securities, it can become more difficult to sell the securities at or
  near their perceived value. In such a market, the value of such securities and
  the fund's share price may fall dramatically. Investments in foreign securities
  may have greater exposure to liquidity risk than domestic securities.

o Non-diversification risk. The fund is non-diversified, which means that the
  fund may invest a relatively high percentage of its assets in a limited number
  of issuers. Therefore, the fund's performance may be more vulnerable to changes
  in the market value of a single issuer or group of issuers and more susceptible
  to risks associated with a single economic, political or regulatory occurrence
  than a diversified fund.
Risk, Lose Money rr_RiskLoseMoney The fund's share price fluctuates, sometimes dramatically, which means you could lose money.
Risk, Nondiversified Status rr_RiskNondiversifiedStatus The fund is non-diversified, which means that the fund may invest a relatively high percentage of its assets in a limited number of issuers. Therefore, the fund's performance may be more vulnerable to changes in the market value of a single issuer or group of issuers and more susceptible to risks associated with a single economic, political or regulatory occurrence than a diversified fund.
Risk, Not Insured Depository Institution rr_RiskNotInsuredDepositoryInstitution An investment in the fund is not a bank deposit. It is not insured or guaranteed by the Federal Deposit Insurance Corporation (FDIC) or any other government agency.
Bar Chart and Performance Table, Heading rr_BarChartAndPerformanceTableHeading Performance
Performance, Narrative rr_PerformanceNarrativeTextBlock 
The following bar chart and table provide some indication of the risks of
investing in the fund. The table compares the average annual total returns
of the fund's shares to those of a broad measure of market performance. The
fund's past performance (before and after taxes) is no guarantee of future
results.  More recent performance information may be available at
www.dreyfus.com.
Performance, Information Illustrates Variability of Returns rr_PerformanceInformationIllustratesVariabilityOfReturns The following bar chart and table provide some indication of the risks of investing in the fund.
Performance, Availability Website Address rr_PerformanceAvailabilityWebSiteAddress www.dreyfus.com
Performance, Past Does Not Indicate Future rr_PerformancePastDoesNotIndicateFuture The fund's past performance (before and after taxes) is no guarantee of future results.
Bar Chart, Heading rr_BarChartHeading Year-by-Year Total Returns as of 12/31 each year (%) Class A
Bar Chart, Narrative rr_BarChartNarrativeTextBlock 
The bar chart shows changes in the performance of the fund's Class A shares
from year to year. Sales charges, if any, are not reflected in the bar
chart, and if those charges were included, returns would have been less than
those shown.
Bar Chart, Does Not Reflect Sales Loads rr_BarChartDoesNotReflectSalesLoads Sales charges, if any, are not reflected in the bar chart, and if those charges were included, returns would have been less than those shown.
Bar Chart, Closing rr_BarChartClosingTextBlock 
Best Quarter
Q3, 2010: 19.19%
Worst Quarter
Q2, 2010: -8.96%
The year-to-date total return of the fund's Class A shares as of 9/30/11 was
-22.38%.
Index No Deduction for Fees, Expenses, Taxes rr_IndexNoDeductionForFeesExpensesTaxes reflects no deduction for fees, expenses or taxes
Performance Table, Uses Highest Federal Rate rr_PerformanceTableUsesHighestFederalRate After-tax returns are calculated using the historical highest individual federal marginal tax rates, and do not reflect the impact of state and local taxes.
Performance Table, Not Relevant to Tax Deferred rr_PerformanceTableNotRelevantToTaxDeferred Actual after-tax returns depend on the investor's tax situation and may differ from those shown, and the after-tax returns shown are not relevant to investors who hold their shares through tax-deferred arrangements such as 401(k) plans or individual retirement accounts.
Performance Table, One Class of after Tax Shown rr_PerformanceTableOneClassOfAfterTaxShown After-tax performance is shown only for Class A shares. After-tax performance of the fund's other share classes will vary.
Performance Table, Narrative rr_PerformanceTableNarrativeTextBlock 
After-tax performance is shown only for Class A shares. After-tax performance of
the fund's other share classes will vary. After-tax returns are calculated using
the historical highest individual federal marginal tax rates, and do not reflect
the impact of state and local taxes. Actual after-tax returns depend on the
investor's tax situation and may differ from those shown, and the after-tax
returns shown are not relevant to investors who hold their shares through
tax-deferred arrangements such as 401(k) plans or individual retirement
accounts.
Average Annual Returns, Caption rr_AverageAnnualReturnCaption Average Annual Total Returns (as of 12/31/10)
Dreyfus Brazil Equity Fund (Prospectus Summary) | Dreyfus Brazil Equity Fund | Class A
  
Risk/Return: rr_RiskReturnAbstract  
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination 2013-01-01
Year to Date Return, Label rr_YearToDateReturnLabel The year-to-date total return of the fund's Class A shares
Bar Chart, Year to Date Return, Date rr_BarChartYearToDateReturnDate Sep. 30, 2011
Bar Chart, Year to Date Return rr_BarChartYearToDateReturn (22.38%)
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Best Quarter
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Sep. 30, 2010
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 19.19%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Worst Quarter
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Jun. 30, 2010
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (8.96%)
Dreyfus Brazil Equity Fund (Prospectus Summary) | Dreyfus Brazil Equity Fund | Class C
  
Risk/Return: rr_RiskReturnAbstract  
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination 2013-01-01
Dreyfus Brazil Equity Fund (Prospectus Summary) | Dreyfus Brazil Equity Fund | Class I
  
Risk/Return: rr_RiskReturnAbstract  
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination 2013-01-01
Dreyfus Brazil Equity Fund | MSCI 10/40 Brazil NR Index
  
Risk/Return: rr_RiskReturnAbstract  
Average Annual Returns, Label rr_AverageAnnualReturnLabel MSCI 10/40 Brazil NR Index reflects no deduction for fees, expenses or taxes
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 10.34%
Average Annual Returns, Since Inception rr_AverageAnnualReturnSinceInception 19.51%
Dreyfus Brazil Equity Fund | Class A
  
Risk/Return: rr_RiskReturnAbstract  
Maximum sales charge (load) imposed on purchases (as a percentage of offering price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice 5.75%
Maximum deferred sales charge (load) (as a percentage of lower of purchase or sale price) rr_MaximumDeferredSalesChargeOverOfferingPrice none
Maximum redemption fee (as a percentage of transaction amount; charged only when selling shares you have owned for less than 60 days) rr_RedemptionFeeOverRedemption (2.00%)
Management fees rr_ManagementFeesOverAssets 1.25%
Distribution (Rule 12b-1) fees rr_DistributionAndService12b1FeesOverAssets none
Other expenses (including shareholder services fees) rr_OtherExpensesOverAssets 0.83%
Total annual fund operating expenses rr_ExpensesOverAssets 2.08%
Fee waiver and/or expense reimbursement rr_FeeWaiverOrReimbursementOverAssets   
Total annual fund operating expenses (after fee waiver and/or expense reimbursement) rr_NetExpensesOverAssets 2.08% [1]
Expense Example, With Redemption, 1 Year rr_ExpenseExampleYear01 774
Expense Example, With Redemption, 3 Years rr_ExpenseExampleYear03 1,189
Expense Example, With Redemption, 5 Years rr_ExpenseExampleYear05 1,629
Expense Example, With Redemption, 10 Years rr_ExpenseExampleYear10 2,847
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 774
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 1,189
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 1,629
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 2,847
Annual Return 2010 rr_AnnualReturn2010 10.17%
Average Annual Returns, Label rr_AverageAnnualReturnLabel Class A returns before taxes
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 3.82%
Average Annual Returns, Since Inception rr_AverageAnnualReturnSinceInception 12.15%
Average Annual Returns, Inception Date rr_AverageAnnualReturnInceptionDate Oct. 01, 2009
Dreyfus Brazil Equity Fund | Class A | After Taxes on Distributions
  
Risk/Return: rr_RiskReturnAbstract  
Average Annual Returns, Label rr_AverageAnnualReturnLabel Class A returns after taxes on distributions
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 3.79%
Average Annual Returns, Since Inception rr_AverageAnnualReturnSinceInception 12.12%
Average Annual Returns, Inception Date rr_AverageAnnualReturnInceptionDate Oct. 01, 2009
Dreyfus Brazil Equity Fund | Class A | After Taxes on Distributions and Sales
  
Risk/Return: rr_RiskReturnAbstract  
Average Annual Returns, Label rr_AverageAnnualReturnLabel Class A returns after taxes on distributions and sale of fund shares
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 2.72%
Average Annual Returns, Since Inception rr_AverageAnnualReturnSinceInception 10.42%
Average Annual Returns, Inception Date rr_AverageAnnualReturnInceptionDate Oct. 01, 2009
Dreyfus Brazil Equity Fund | Class C
  
Risk/Return: rr_RiskReturnAbstract  
Maximum sales charge (load) imposed on purchases (as a percentage of offering price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum deferred sales charge (load) (as a percentage of lower of purchase or sale price) rr_MaximumDeferredSalesChargeOverOfferingPrice 1.00%
Maximum redemption fee (as a percentage of transaction amount; charged only when selling shares you have owned for less than 60 days) rr_RedemptionFeeOverRedemption (2.00%)
Management fees rr_ManagementFeesOverAssets 1.25%
Distribution (Rule 12b-1) fees rr_DistributionAndService12b1FeesOverAssets 0.75%
Other expenses (including shareholder services fees) rr_OtherExpensesOverAssets 0.87%
Total annual fund operating expenses rr_ExpensesOverAssets 2.87%
Fee waiver and/or expense reimbursement rr_FeeWaiverOrReimbursementOverAssets   
Total annual fund operating expenses (after fee waiver and/or expense reimbursement) rr_NetExpensesOverAssets 2.87% [1]
Expense Example, With Redemption, 1 Year rr_ExpenseExampleYear01 390
Expense Example, With Redemption, 3 Years rr_ExpenseExampleYear03 889
Expense Example, With Redemption, 5 Years rr_ExpenseExampleYear05 1,513
Expense Example, With Redemption, 10 Years rr_ExpenseExampleYear10 3,195
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 290
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 889
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 1,513
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 3,195
Average Annual Returns, Label rr_AverageAnnualReturnLabel Class C returns before taxes
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 8.65%
Average Annual Returns, Since Inception rr_AverageAnnualReturnSinceInception 16.99%
Average Annual Returns, Inception Date rr_AverageAnnualReturnInceptionDate Oct. 01, 2009
Dreyfus Brazil Equity Fund | Class I
  
Risk/Return: rr_RiskReturnAbstract  
Maximum sales charge (load) imposed on purchases (as a percentage of offering price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum deferred sales charge (load) (as a percentage of lower of purchase or sale price) rr_MaximumDeferredSalesChargeOverOfferingPrice none
Maximum redemption fee (as a percentage of transaction amount; charged only when selling shares you have owned for less than 60 days) rr_RedemptionFeeOverRedemption (2.00%)
Management fees rr_ManagementFeesOverAssets 1.25%
Distribution (Rule 12b-1) fees rr_DistributionAndService12b1FeesOverAssets none
Other expenses (including shareholder services fees) rr_OtherExpensesOverAssets 0.60%
Total annual fund operating expenses rr_ExpensesOverAssets 1.85%
Fee waiver and/or expense reimbursement rr_FeeWaiverOrReimbursementOverAssets   
Total annual fund operating expenses (after fee waiver and/or expense reimbursement) rr_NetExpensesOverAssets 1.85% [1]
Expense Example, With Redemption, 1 Year rr_ExpenseExampleYear01 188
Expense Example, With Redemption, 3 Years rr_ExpenseExampleYear03 582
Expense Example, With Redemption, 5 Years rr_ExpenseExampleYear05 1,001
Expense Example, With Redemption, 10 Years rr_ExpenseExampleYear10 2,169
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 188
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 582
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 1,001
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 2,169
Average Annual Returns, Label rr_AverageAnnualReturnLabel Class I returns before taxes
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 10.52%
Average Annual Returns, Since Inception rr_AverageAnnualReturnSinceInception 17.93%
Average Annual Returns, Inception Date rr_AverageAnnualReturnInceptionDate Oct. 01, 2009
[1] The Dreyfus Corporation has contractually agreed, until January 1, 2013, to assume the direct expenses of the fund so that the total annual fund operating expenses of none of the classes (excluding Rule 12b-1 fees, shareholder services fees, taxes, interest, brokerage commissions, commitment fees on borrowings and extraordinary expenses) exceed 2.25%.