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Label Element Value
Risk/Return: rr_RiskReturnAbstract  
ProspectusDate rr_ProspectusDate Oct. 01, 2011
Dreyfus Emerging Markets Debt Local Currency Fund (Prospectus Summary) | Dreyfus Emerging Markets Debt Local Currency 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 to maximize total return.
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 10 of the Prospectus and in the How to Buy Shares section
on page B-45 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% 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
97.99% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 97.99%
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 borrowing for investment purposes, in emerging market bonds and other
debt instruments denominated in the local currency of issue, and in derivative
instruments that provide investment exposure to such securities. These
instruments consist primarily of emerging market government bonds and currency
forward exchange contracts. The fund's portfolio managers employ an investment
process that uses in depth fundamental country and currency analysis disciplined
by proprietary quantitative valuation models. A "top down" analysis of
macroeconomic, financial and political variables guides country and currency
allocation. The portfolio managers also consider other market technicals and the
global risk environment. The portfolio managers seek to identify shifts in
country fundamentals and consider the risk adjusted attractiveness of currency
and duration returns for each emerging market country. The fund is not
restricted as to credit quality when making investments in debt securities.
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 Foreign government obligations and securities of supranational entities risk.
Investing in foreign government obligations and the sovereign debt of emerging
market countries creates exposure to the direct or indirect consequences of
political, social or economic changes in the countries that issue the securities
or in which the issuers are located. Factors which may influence the ability or
willingness of a foreign government or country to service debt include a
country's cash flow situation, the availability of sufficient foreign exchange
on the date a payment is due, the relative size of its debt service burden to
the economy as a whole and its government's policy towards the International
Monetary Fund, the International Bank for Reconstruction and Development and
other international agencies, the obligor's balance of payments, including
export performance, its access to international credits and investments,
fluctuations in interest rates and the extent of its foreign reserves. A
governmental obligor may default on its obligations. These risks are heightened
with respect to emerging market countries.

o Foreign investment risk. Investments in foreign securities carry additional
risks, including exposure to currency fluctuations, less liquidity, less
developed or efficient trading markets, lack of comprehensive company
information, political instability and differing auditing and legal standards.
To the extent the fund's investment are concentrated in a limited number of
foreign countries, the fund's performance could be more volatile than that of
more geographically diversified funds.

o Emerging market risk. The securities of issuers located in emerging markets
tend to be more volatile and less liquid than securities of issuers located in
more mature economies, and emerging markets generally have less diverse and less
mature economic structures and less stable political systems than those of
developed countries. The securities of issuers located or doing substantial
business in emerging markets are often subject to rapid and large changes in
price.

o Credit risk. The instruments in which the fund invests may have ratings that
are below investment grade ("high yield" or "junk" bonds). High yield bonds
involve greater credit risk, including the risk of default, than investment
grade bonds, and are considered predominantly speculative with respect to the
issuer's ability to make principal and interest payments. The prices of high
yield bonds can fall dramatically in response to bad news about the issuer or
its industry, or the economy in general.

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 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. Liquidity
risk also exists when a particular derivative instrument is difficult to
purchase or sell. If a derivative transaction is particularly large or if the
relevant market is illiquid, it may not be possible to initiate a transaction or
liquidate a position at an advantageous time or price.

o Derivatives risk. A small investment in derivatives could have a potentially
large impact on the fund's performance. The use of derivatives involves risks
different from, or possibly greater than, the risks associated with investing
directly in the underlying assets. Derivatives can be highly volatile, illiquid
and difficult to value.

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
Q2, 2009: 14.82%
Worst Quarter
Q1, 2009: -4.57%

The year-to-date total return of the fund's Class A shares as of 6/30/11 was
1.39%.
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 Emerging Markets Debt Local Currency Fund (Prospectus Summary) | Dreyfus Emerging Markets Debt Local Currency Fund | Class A
  
Risk/Return: rr_RiskReturnAbstract  
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination 2012-10-01
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 Jun. 30, 2011
Bar Chart, Year to Date Return rr_BarChartYearToDateReturn 1.39%
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Best Quarter
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Jun. 30, 2009
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 14.82%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Worst Quarter
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Mar. 31, 2009
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (4.57%)
Dreyfus Emerging Markets Debt Local Currency Fund (Prospectus Summary) | Dreyfus Emerging Markets Debt Local Currency Fund | Class C
  
Risk/Return: rr_RiskReturnAbstract  
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination 2012-10-01
Dreyfus Emerging Markets Debt Local Currency Fund (Prospectus Summary) | Dreyfus Emerging Markets Debt Local Currency Fund | Class I
  
Risk/Return: rr_RiskReturnAbstract  
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination 2012-10-01
Dreyfus Emerging Markets Debt Local Currency Fund | JP Morgan Government Bond Index
  
Risk/Return: rr_RiskReturnAbstract  
Average Annual Returns, Label rr_AverageAnnualReturnLabel JP Morgan Government Bond Index - Emerging Markets Diversified reflects no deduction for fees, expenses or taxes [1]
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 13.32%
Average Annual Returns, Since Inception rr_AverageAnnualReturnSinceInception 9.28%
Dreyfus Emerging Markets Debt Local Currency Fund | Class A
  
Risk/Return: rr_RiskReturnAbstract  
Maximum sales charge (load) imposed on purchases (as a percentage of offering price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice 4.50%
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 fo less than 60 days) rr_RedemptionFeeOverRedemption (2.00%)
Management fees rr_ManagementFeesOverAssets 0.75%
Distribution (Rule 12b-1) fees rr_DistributionAndService12b1FeesOverAssets none
Other expenses (including shareholder services fees) rr_OtherExpensesOverAssets 0.52%
Total annual fund operating expenses rr_ExpensesOverAssets 1.27%
Fee waiver and/or expense reimbursement rr_FeeWaiverOrReimbursementOverAssets   [2]
Total annual fund operating expenses (after fee waiver and/or expense reimbursement) rr_NetExpensesOverAssets 1.27%
Expense Example, With Redemption, 1 Year rr_ExpenseExampleYear01 574
Expense Example, With Redemption, 3 Years rr_ExpenseExampleYear03 835
Expense Example, With Redemption, 5 Years rr_ExpenseExampleYear05 1,116
Expense Example, With Redemption, 10 Years rr_ExpenseExampleYear10 1,915
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 574
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 835
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 1,116
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 1,915
Annual Return 2009 rr_AnnualReturn2009 21.12%
Annual Return 2010 rr_AnnualReturn2010 11.60%
Average Annual Returns, Label rr_AverageAnnualReturnLabel Class A returns before taxes
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 6.55%
Average Annual Returns, Since Inception rr_AverageAnnualReturnSinceInception 7.43%
Average Annual Returns, Inception Date rr_AverageAnnualReturnInceptionDate Sep. 12, 2008
Dreyfus Emerging Markets Debt Local Currency 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 5.61%
Average Annual Returns, Since Inception rr_AverageAnnualReturnSinceInception 6.37%
Average Annual Returns, Inception Date rr_AverageAnnualReturnInceptionDate Sep. 12, 2008
Dreyfus Emerging Markets Debt Local Currency 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 4.27%
Average Annual Returns, Since Inception rr_AverageAnnualReturnSinceInception 5.71%
Average Annual Returns, Inception Date rr_AverageAnnualReturnInceptionDate Sep. 12, 2008
Dreyfus Emerging Markets Debt Local Currency 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 fo less than 60 days) rr_RedemptionFeeOverRedemption (2.00%)
Management fees rr_ManagementFeesOverAssets 0.75%
Distribution (Rule 12b-1) fees rr_DistributionAndService12b1FeesOverAssets 0.75%
Other expenses (including shareholder services fees) rr_OtherExpensesOverAssets 0.49%
Total annual fund operating expenses rr_ExpensesOverAssets 1.99%
Fee waiver and/or expense reimbursement rr_FeeWaiverOrReimbursementOverAssets   [2]
Total annual fund operating expenses (after fee waiver and/or expense reimbursement) rr_NetExpensesOverAssets 1.99%
Expense Example, With Redemption, 1 Year rr_ExpenseExampleYear01 302
Expense Example, With Redemption, 3 Years rr_ExpenseExampleYear03 624
Expense Example, With Redemption, 5 Years rr_ExpenseExampleYear05 1,073
Expense Example, With Redemption, 10 Years rr_ExpenseExampleYear10 2,317
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 202
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 624
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 1,073
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 2,317
Average Annual Returns, Label rr_AverageAnnualReturnLabel Class C returns before taxes
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 9.74%
Average Annual Returns, Since Inception rr_AverageAnnualReturnSinceInception 8.77%
Average Annual Returns, Inception Date rr_AverageAnnualReturnInceptionDate Sep. 12, 2008
Dreyfus Emerging Markets Debt Local Currency 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 fo less than 60 days) rr_RedemptionFeeOverRedemption (2.00%)
Management fees rr_ManagementFeesOverAssets 0.75%
Distribution (Rule 12b-1) fees rr_DistributionAndService12b1FeesOverAssets none
Other expenses (including shareholder services fees) rr_OtherExpensesOverAssets 0.22%
Total annual fund operating expenses rr_ExpensesOverAssets 0.97%
Fee waiver and/or expense reimbursement rr_FeeWaiverOrReimbursementOverAssets   [2]
Total annual fund operating expenses (after fee waiver and/or expense reimbursement) rr_NetExpensesOverAssets 0.97%
Expense Example, With Redemption, 1 Year rr_ExpenseExampleYear01 99
Expense Example, With Redemption, 3 Years rr_ExpenseExampleYear03 309
Expense Example, With Redemption, 5 Years rr_ExpenseExampleYear05 536
Expense Example, With Redemption, 10 Years rr_ExpenseExampleYear10 1,190
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 99
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 309
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 536
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 1,190
Average Annual Returns, Label rr_AverageAnnualReturnLabel Class I returns before taxes
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 11.96%
Average Annual Returns, Since Inception rr_AverageAnnualReturnSinceInception 9.89%
Average Annual Returns, Inception Date rr_AverageAnnualReturnInceptionDate Sep. 12, 2008
[1] For comparative purposes, the value of JP Morgan Government Bond Index - Emerging Markets Diversified on 8/31/08 is used as the beginning value on 9/12/08.
[2] The Dreyfus Corporation has contractually agreed, until October 1, 2012, to waive receipt of its fees and/or assume the expenses of the fund so that the 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 1.10%. After October 1, 2012, The Dreyfus Corporation may terminate the expense limitation at any time.