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DREYFUS WORLDWIDE GROWTH FUND  
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 long-term capital growth consistent with the preservation of capital;
Objective, Secondary [Text Block] rr_ObjectiveSecondaryTextBlock

current income is a secondary goal.
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 the fund or shares of other funds in the Dreyfus Family of Funds that are subject to a sales charge. More information about sales charges, including these and other discounts and waivers, is available from your financial professional and in the Shareholder Guide section beginning on page 9 of the prospectus and in the How to Buy Shares section and the Additional Information About How to Buy Shares section beginning 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 4.52% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 4.52%
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 the fund or shares of other funds in the Dreyfus Family of Funds that are subject to a sales charge.
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 the common stock of U.S. and foreign companies. The fund focuses on "blue chip" multinational companies with total market values of more than $5 billion. These are large, established, globally managed companies that manufacture and distribute their products and services throughout the world.


In choosing stocks, the fund's portfolio managers first identify economic sectors that they believe will expand over the next three to five years or longer. Using fundamental analysis, the fund's portfolio managers then seek companies within these sectors that have demonstrated sustained patterns of profitability, strong balance sheets, an expanding global presence and the potential to achieve predictable, above-average earnings growth. Under normal circumstances, at least 40% of the fund's assets will be invested in companies that have significant exposure to the economies of countries other than the United States. These are companies that are organized or domiciled in a foreign country or have at least 50% of their assets outside the U.S. or at least 50% of their revenues or profits are from goods produced or sold, investments made, or services performed outside the United States. These companies may be subject to the risks that are involved in investing in foreign securities. The fund also invests in U.S. dollar-denominated American Depositary Receipts (ADRs).


The fund employs a "buy-and-hold" investment strategy, which is an investment strategy characterized by a low portfolio turnover rate, which helps reduce the fund's trading costs and minimizes tax liability by limiting the distribution of capital gains.

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.


· 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 market conditions or because of factors that affect the particular company or the company's industry.


· 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 issuers. 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.


· Market sector risk. The fund may significantly overweight or underweight certain countries, companies, industries or market sectors, which may cause the fund's performance to be more or less sensitive to developments affecting those countries, companies, industries or sectors.


· Blue chip risk. By focusing on large capitalization, high quality stocks, the fund may underperform funds that invest in the stocks of lower quality, smaller capitalization companies during periods when the stocks of such companies are in favor.


· ADR risk. ADRs may be subject to certain of the risks associated with direct investments in the securities of foreign companies, such as currency risk, political and economic risk and market risk, because their values depend on the performance of the non-dollar denominated underlying foreign securities. Certain countries may limit the ability to convert ADRs into the underlying foreign securities and vice versa, which may cause the securities of the foreign company to trade at a discount or premium to the market price of the related ADR.


· Management risk. The investment process used by the fund's portfolio managers could fail to achieve the fund's investment goal and cause your fund investment to lose value.

Risk Lose Money [Text] rr_RiskLoseMoney The fund's share price fluctuates, sometimes dramatically, which means you could lose money.
Risk Not Insured Depository Institution [Text] 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 [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. 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. 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. 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
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
Q3, 2009: 15.49%

Worst Quarter
Q3, 2011: -12.58%
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Best Quarter
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Sep. 30, 2009
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 15.49%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Worst Quarter
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Sep. 30, 2011
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (12.58%)
Index No Deduction for Fees, Expenses, Taxes [Text] rr_IndexNoDeductionForFeesExpensesTaxes reflects no deductions 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 U.S. 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 Explanation after Tax Higher rr_PerformanceTableExplanationAfterTaxHigher Returns after taxes on distributions and sale of fund shares may be higher than returns before taxes or returns after taxes on distributions due to an assumed tax benefit from losses on a sale of the fund's shares at the end of the period.
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 U.S. tax-deferred arrangements such as 401(k) plans or individual retirement accounts. Returns after taxes on distributions and sale of fund shares may be higher than returns before taxes or returns after taxes on distributions due to an assumed tax benefit from losses on a sale of the fund's shares at the end of the period.


For the fund's Class Y shares, periods prior to the inception date reflect the performance of the fund's Class A shares, without reflecting any applicable sales charges for Class A shares. Such performance figures have not been adjusted to reflect applicable class fees and expenses. Each share class is invested in the same portfolio of securities, and the annual returns would have differed only to the extent that the classes have different expenses.

Caption rr_AverageAnnualReturnCaption Average Annual Total Returns (as of 12/31/18)
DREYFUS WORLDWIDE GROWTH FUND | MSCI World Index reflects no deductions for fees, expenses or taxes  
Risk/Return: rr_RiskReturnAbstract  
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 (8.71%)
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 4.56%
Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10 9.67%
DREYFUS WORLDWIDE GROWTH FUND | Class A  
Risk/Return: rr_RiskReturnAbstract  
Maximum sales charge (load) imposed on purchases (as a percentage of offering price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice 5.75%
Maximum deferred sales charge (load) (as a percentage of lower of purchase or sale price) rr_MaximumDeferredSalesChargeOverOfferingPrice none [1]
Management fees rr_ManagementFeesOverAssets 0.75%
Distribution (12b-1) fees rr_DistributionAndService12b1FeesOverAssets none
Other expenses (including shareholder services fees) rr_OtherExpensesOverAssets 0.42%
Total annual fund operating expenses rr_ExpensesOverAssets 1.17%
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 $ 687
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 925
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 1,182
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 1,914
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 687
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 925
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 1,182
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 1,914
Annual Return 2009 rr_AnnualReturn2009 22.40%
Annual Return 2010 rr_AnnualReturn2010 11.88%
Annual Return 2011 rr_AnnualReturn2011 6.76%
Annual Return 2012 rr_AnnualReturn2012 13.41%
Annual Return 2013 rr_AnnualReturn2013 18.71%
Annual Return 2014 rr_AnnualReturn2014 4.63%
Annual Return 2015 rr_AnnualReturn2015 (2.08%)
Annual Return 2016 rr_AnnualReturn2016 7.05%
Annual Return 2017 rr_AnnualReturn2017 27.04%
Annual Return 2018 rr_AnnualReturn2018 (8.67%)
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 (13.93%)
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 3.70%
Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10 8.97%
DREYFUS WORLDWIDE GROWTH FUND | Class A | After Taxes on Distributions  
Risk/Return: rr_RiskReturnAbstract  
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 (16.34%)
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 1.58%
Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10 7.59%
DREYFUS WORLDWIDE GROWTH FUND | Class A | After Taxes on Distributions and Sale of Fund Shares  
Risk/Return: rr_RiskReturnAbstract  
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 (6.35%)
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 2.83%
Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10 7.32%
DREYFUS WORLDWIDE GROWTH FUND | Class C  
Risk/Return: rr_RiskReturnAbstract  
Maximum sales charge (load) imposed on purchases (as a percentage of offering price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum deferred sales charge (load) (as a percentage of lower of purchase or sale price) rr_MaximumDeferredSalesChargeOverOfferingPrice 1.00%
Management fees rr_ManagementFeesOverAssets 0.75%
Distribution (12b-1) fees rr_DistributionAndService12b1FeesOverAssets 0.75%
Other expenses (including shareholder services fees) rr_OtherExpensesOverAssets 0.40%
Total annual fund operating expenses rr_ExpensesOverAssets 1.90%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 293
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 597
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 1,026
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 2,222
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 193
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 597
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 1,026
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 2,222
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 (10.13%)
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 4.16%
Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10 8.81%
DREYFUS WORLDWIDE GROWTH FUND | Class I  
Risk/Return: rr_RiskReturnAbstract  
Maximum sales charge (load) imposed on purchases (as a percentage of offering price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum deferred sales charge (load) (as a percentage of lower of purchase or sale price) rr_MaximumDeferredSalesChargeOverOfferingPrice none
Management fees rr_ManagementFeesOverAssets 0.75%
Distribution (12b-1) fees rr_DistributionAndService12b1FeesOverAssets none
Other expenses (including shareholder services fees) rr_OtherExpensesOverAssets 0.15%
Total annual fund operating expenses rr_ExpensesOverAssets 0.90%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 92
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 287
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 498
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 1,108
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 92
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 287
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 498
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 1,108
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 (8.45%)
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 5.21%
Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10 9.91%
DREYFUS WORLDWIDE GROWTH FUND | Class Y  
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
Management fees rr_ManagementFeesOverAssets 0.75%
Distribution (12b-1) fees rr_DistributionAndService12b1FeesOverAssets none
Other expenses (including shareholder services fees) rr_OtherExpensesOverAssets 0.07%
Total annual fund operating expenses rr_ExpensesOverAssets 0.82%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 84
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 262
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 455
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 1,014
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 84
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 262
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 455
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 1,014
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 (8.39%)
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 5.30%
Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10 9.91%
Average Annual Returns, Inception Date rr_AverageAnnualReturnInceptionDate Jul. 01, 2013
[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.