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Risk/Return: rr_RiskReturnAbstract  
Risk/Return [Heading] rr_RiskReturnHeading Fund Summary
Objective [Heading] rr_ObjectiveHeading Investment Objective
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock

The fund seeks to maximize total return through capital appreciation and income.

Expense [Heading] rr_ExpenseHeading Fees and Expenses
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 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 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.

Shareholder Fees Caption [Text] rr_ShareholderFeesCaption Shareholder Fees (fees paid directly from your investment)
Operating Expenses Caption [Text] rr_OperatingExpensesCaption Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)
Portfolio Turnover [Heading] rr_PortfolioTurnoverHeading Portfolio Turnover
Portfolio Turnover [Text Block] rr_PortfolioTurnoverTextBlock

The fund pays transaction costs, such as commissions, when it buys and sells securities (or "turns over" its portfolio). A higher portfolio turnover 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 192.50% of the average value of its portfolio.

Portfolio Turnover, Rate rr_PortfolioTurnoverRate 192.50%
Expense Breakpoint Discounts [Text] 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 [Text Block] 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 [Text] rr_ExpenseExampleNoRedemptionByYearCaption You would pay the following expenses if you did not redeem your shares:
Strategy [Heading] rr_StrategyHeading Principal Investment Strategy
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock

To pursue its goal, the fund normally invests at least 80% of its net assets, plus any borrowings for investment purposes, in fixed-income securities. The fund also normally invests at least 65% of its assets in non-U.S. dollar denominated fixed-income securities of foreign governments and companies located in various countries, including emerging markets. The fund may invest up to 25% of its assets in emerging markets generally and up to 5% of its assets in any single emerging market country.


Generally, the fund seeks to maintain a portfolio with an average credit quality of investment grade. The fund, however, may invest up to 25% of its assets in securities (not including securities of emerging market issuers) rated below investment grade ("high yield" or "junk" bonds), or the unrated equivalent as determined by The Dreyfus Corporation, at the time of purchase. The fund will not invest in securities rated lower than B at the time of purchase, except that the fund may invest in securities of issuers in emerging markets of any credit quality, including those rated or determined to be below investment grade quality.


The fund's portfolio managers focus on identifying undervalued government bond markets, currencies, sectors and securities and look for fixed-income securities with the most potential for added value. The portfolio managers select securities by using fundamental economic research and quantitative analysis to allocate assets among countries and currencies based on a comparative evaluation of interest and inflation rate trends, government fiscal and monetary policies, and the credit quality of government debt.


There are no restrictions on the dollar-weighted average maturity or average effective duration of the fund's portfolio or on the maturities or durations of the individual fixed-income securities the fund may purchase.


The fund may, but is not required to, use derivatives, such as futures, options and forward contracts, as a substitute for investing directly in an underlying asset, to increase returns, to manage market, foreign currency and/or duration or interest rate risk, or as part of a hedging strategy. The fund's portfolio managers have considerable latitude in determining whether to hedge the fund's currency exposure and the extent of any such hedging.

Risk [Heading] rr_RiskHeading Principal Risks
Risk Narrative [Text Block] 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.


· 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. Failure of an issuer or guarantor of a fixed-income security, or the counterparty to a derivatives transaction, to make timely interest or principal payments or otherwise honor its obligations could cause the fund to lose money.


· Interest rate risk. Prices of bonds tend to move inversely with changes in interest rates. Typically, a rise in rates will adversely affect bond prices and, accordingly, the fund's share price. The longer the effective maturity and duration of the fund's fixed-income portfolio, the more the fund's share price is likely to react to interest rates.


· Foreign investment risk. To the extent the fund invests in foreign securities, the fund's performance will be influenced by political, social and economic factors affecting investments in foreign companies. Special risks associated with investments in foreign issuers include exposure to currency fluctuations, less liquidity, less developed or less efficient trading markets, lack of comprehensive company information, political and economic instability and differing auditing and legal standards. Investments denominated in foreign currencies are subject to the risk that such currencies will decline in value relative to the U.S. dollar and affect the value of these investments held by the fund. To the extent the fund's investment are concentrated in one or a limited number of foreign countries, the fund's performance could be more volatile than that of more geographically diversified funds.


· 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 or, in the case of hedged positions, that the U.S. dollar will decline relative to the currency being hedged. Currency exchange rates may fluctuate significantly over short periods of time. Foreign currencies are also subject to risks caused by inflation, interest rates, budget deficits and low savings rates, political factors and government intervention and controls.


· 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.


· Liquidity risk. When there is little or no active trading market for a security, the fund may not be able to sell the security in a timely manner at its perceived value, which could cause the fund's share price to fall. Investments in foreign securities, particularly those of issuers located in emerging markets, tend to have greater exposure to liquidity risk than domestic securities.


· 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.


· Portfolio turnover risk. The fund may engage in short-term trading, which could produce higher transaction costs and taxable distributions, and lower the fund's after-tax performance.


· 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 [Text] rr_RiskLoseMoney The fund's share price fluctuates, sometimes dramatically, which means you could lose money.
Risk Nondiversified Status [Text] 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 [Text] rr_RiskNotInsuredDepositoryInstitution 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 [Text Block] rr_PerformanceNarrativeTextBlock

The following bar chart and table provide some indication of the risks of investing in the fund. The bar chart shows changes in the performance of the fund's Class A shares from year to year. 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 not necessarily an indication of how the fund will perform in the future. 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. More recent performance information may be available at www.dreyfus.com.

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.
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress www.dreyfus.com
Performance Past Does Not Indicate Future [Text] rr_PerformancePastDoesNotIndicateFuture The fund's past performance (before and after taxes) is not necessarily an indication of how the fund will perform in the future.
Bar Chart [Heading] rr_BarChartHeading Year-by-Year Total Returns as of 12/31 each year (%) -- Class A Shares
Bar Chart Does Not Reflect Sales Loads [Text] 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 [Text Block] rr_BarChartClosingTextBlock

Best Quarter
Q2, 2009: 12.08%


Worst Quarter
Q1, 2009: -5.29%

Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Best Quarter
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Jun. 30, 2009
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 12.08%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Worst Quarter
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Mar. 31, 2009
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (5.29%)
Index No Deduction for Fees, Expenses, Taxes [Text] 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 income 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 [Text] 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 income 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.

Caption rr_AverageAnnualReturnCaption Average Annual Total Returns (as of 12/31/12) Share Class
Barclays Global Aggregate ex-U.S. (unhedged) Bond Index reflects no deduction for fees, expenses or taxes
  
Risk/Return: rr_RiskReturnAbstract  
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 4.09%
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 5.06%
Average Annual Returns, Since Inception rr_AverageAnnualReturnSinceInception 6.33%
Average Annual Returns, Inception Date rr_AverageAnnualReturnInceptionDate Dec. 30, 2005
Dreyfus International Bond 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_MaximumDeferredSalesChargeOverOther none [1]
Management fees rr_ManagementFeesOverAssets 0.60%
Distribution (Rule 12b-1) fees rr_DistributionAndService12b1FeesOverAssets none
Other expenses (including shareholder services fees) rr_OtherExpensesOverAssets 0.42%
Total annual fund operating expenses rr_ExpensesOverAssets 1.02%
Expenses Deferred Charges [Text Block] rr_ExpensesDeferredChargesTextBlock 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.
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 549
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 760
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 988
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 1,642
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 549
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 760
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 988
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 1,642
Annual Return 2006 rr_AnnualReturn2006 6.64%
Annual Return 2007 rr_AnnualReturn2007 10.20%
Annual Return 2008 rr_AnnualReturn2008 11.07%
Annual Return 2009 rr_AnnualReturn2009 17.44%
Annual Return 2010 rr_AnnualReturn2010 7.43%
Annual Return 2011 rr_AnnualReturn2011 3.21%
Annual Return 2012 rr_AnnualReturn2012 9.28%
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 4.35%
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 8.58%
Average Annual Returns, Since Inception rr_AverageAnnualReturnSinceInception 8.53%
Average Annual Returns, Inception Date rr_AverageAnnualReturnInceptionDate Dec. 30, 2005
Dreyfus International Bond Fund - Class A | After Taxes on Distributions
  
Risk/Return: rr_RiskReturnAbstract  
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 3.15%
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 7.17%
Average Annual Returns, Since Inception rr_AverageAnnualReturnSinceInception 7.04%
Dreyfus International Bond Fund - Class A | After Taxes on Distributions and Sale of Fund Shares
  
Risk/Return: rr_RiskReturnAbstract  
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 2.81%
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 6.60%
Average Annual Returns, Since Inception rr_AverageAnnualReturnSinceInception 6.53%
Dreyfus International Bond 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_MaximumDeferredSalesChargeOverOther 1.00%
Management fees rr_ManagementFeesOverAssets 0.60%
Distribution (Rule 12b-1) fees rr_DistributionAndService12b1FeesOverAssets 0.75%
Other expenses (including shareholder services fees) rr_OtherExpensesOverAssets 0.41%
Total annual fund operating expenses rr_ExpensesOverAssets 1.76%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 279
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 554
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 954
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 2,073
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 179
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 554
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 954
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 2,073
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 7.49%
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 8.76%
Average Annual Returns, Since Inception rr_AverageAnnualReturnSinceInception 8.42%
Average Annual Returns, Inception Date rr_AverageAnnualReturnInceptionDate Dec. 30, 2005
Dreyfus International Bond 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_MaximumDeferredSalesChargeOverOther none
Management fees rr_ManagementFeesOverAssets 0.60%
Distribution (Rule 12b-1) fees rr_DistributionAndService12b1FeesOverAssets none
Other expenses (including shareholder services fees) rr_OtherExpensesOverAssets 0.20%
Total annual fund operating expenses rr_ExpensesOverAssets 0.80%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 82
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 255
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 444
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 990
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 82
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 255
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 444
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 990
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 9.59%
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 9.86%
Average Annual Returns, Since Inception rr_AverageAnnualReturnSinceInception 9.53%
Average Annual Returns, Inception Date rr_AverageAnnualReturnInceptionDate Dec. 30, 2005
[1] 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.