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Dreyfus Strategic Beta Emerging Markets Equity 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 appreciation.
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 beginning on page 12 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)
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination Mar. 01, 2017
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 32.52% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 32.52%
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 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. The one-year example and the first year of the three-, five-, and ten-year examples are based on net operating expenses, which reflect the expense limitation by The Dreyfus Corporation. 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 common stocks and other equity securities of companies organized or with their principal place of business, or majority of assets or business, in emerging market countries. The fund considers emerging market countries to be all countries represented in the fund's benchmark index, the Morgan Stanley Capital International Emerging Markets Index, a free float-adjusted, market capitalization-weighted index designed to measure the equity performance of emerging market countries in Africa, Asia, Europe, Latin America, and the Middle East. The fund may invest in equity securities of companies with any market capitalization.


Mellon Capital Management Corporation (Mellon Capital), an affiliate of The Dreyfus Corporation, is the fund's subadviser. Mellon Capital applies a systematic, quantitative investment approach designed to identify and exploit relative misvaluations of the stock prices of emerging market companies based on their economic fundamentals.


The fund's portfolio managers use a proprietary methodology designed to rank and select stocks of emerging market companies based on fundamental company information. In this manner, the portfolio managers employ a "strategic beta" strategy to select and weight stocks for the fund's portfolio using characteristics other than market capitalization. "Beta" is a measure of risk, specifically of the difference between a security's return and that of a benchmark such as the fund's benchmark index. The portfolio managers first weight each stock based on the company's economic size determined by a combination of accounting metrics, including sales, earnings before interest, taxation, depreciation and amortization (EBITDA), and net total payout (including dividends and share repurchases). By weighting stocks based on the company's economic size instead of market capitalization, the fund's portfolio managers seek to focus on companies with more attractive valuations for inclusion in the fund's portfolio. Next, companies are ranked based on the quality and growth of their earnings. These metrics seek to identify high quality companies with sustainable and growing earnings and consistency of performance relative to the stocks of emerging market companies in general. A company's sales and earnings and earnings quality and earnings growth contribute, in part, to its overall beta. The final step in the portfolio construction process is to exclude companies with the lowest expected performance based on the above metrics of earnings quality and earnings growth. The weights of the excluded companies are then reallocated to the remaining companies in the portfolio. Limitations may be placed on the weight of an individual stock in the fund's portfolio for diversification purposes.


The fund's portfolio managers manage risk by diversifying across companies and industries, seeking to limit the potential adverse impact from any one stock or industry. The fund's portfolio is rebalanced semi-annually, using the above-described construction methodology.

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.


· 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.


· 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.


· Emerging market risk. The securities of issuers located or doing substantial business in emerging market countries tend to be more volatile and less liquid than the securities of issuers located in countries with more mature economies. Emerging markets generally have less diverse and less mature economic structures and less stable political systems than those of developed countries. Investments in these countries may be subject to political, economic, legal, market and currency risks. The risks may include less protection of property rights and uncertain political and economic policies, the imposition of capital controls and/or foreign investment limitations by a country, nationalization of businesses and the imposition of sanctions by other countries, such as the United States.


· Growth and value stock risk. By investing in a mix of growth and value companies, the fund assumes the risks of both. Investors often expect growth companies to increase their earnings at a certain rate. If these expectations are not met, investors can punish the stocks inordinately, even if earnings do increase. In addition, growth stocks may lack the dividend yield that may cushion stock prices in market downturns. Value stocks involve the risk that they may never reach their expected full market value, either because the market fails to recognize the stock's intrinsic worth, or the expected value was misgauged. They also may decline in price even though in theory they are already undervalued.


· Market capitalization risk (small-, mid- and large-cap stock risk). To the extent the fund emphasizes small-, mid- or large-cap stocks, it will assume the associated risks. At any given time, any of these market capitalizations may be out of favor with investors. Compared to small- and mid-cap companies, large-cap companies may be less responsive to changes and opportunities affecting their business. To the extent the fund invests in small- and mid-cap companies, it will be subject to additional risks because the operating histories of these companies tend to be more limited, their earnings and revenues less predictable (and some companies may be experiencing significant losses), and their share prices more volatile than those of larger, more established companies. The shares of smaller companies tend to trade less frequently than those of larger, more established companies, which can adversely affect the pricing of these securities and the fund's ability to sell these securities. Smaller companies may have limited product lines, markets or financial resources, or may depend on a limited management group.


· 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 in a timely manner 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 that are illiquid or that trade in lower volumes may be more difficult to value. Investments in foreign securities, particularly those of issuers located in emerging markets, tend to have greater exposure to liquidity risk than domestic securities.
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 the performance of the fund's Class A shares for its first full calendar year of operations. 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
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
Q1, 2015: 2.95%
Worst Quarter
Q3, 2015: -17.93%
 
   
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Best Quarter
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Mar. 31, 2015
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 2.95%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Worst Quarter
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Sep. 30, 2015
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (17.93%)
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 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.
Caption rr_AverageAnnualReturnCaption Average Annual Total Returns (as of 12/31/15)
Dreyfus Strategic Beta Emerging Markets Equity Fund | MSCI Emerging Markets Index reflects no deductions; for fees, expenses or taxes  
Risk/Return: rr_RiskReturnAbstract  
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 (14.92%)
Average Annual Returns, Since Inception rr_AverageAnnualReturnSinceInception (19.22%) [1]
Average Annual Returns, Inception Date rr_AverageAnnualReturnInceptionDate Aug. 31, 2014
Dreyfus Strategic Beta Emerging Markets 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_MaximumDeferredSalesChargeOverOther none [2]
Redemption Fee (as a percentage of Amount Redeemed) rr_RedemptionFeeOverRedemption (2.00%)
Management fees rr_ManagementFeesOverAssets 0.60%
Distribution (12b-1) fees rr_DistributionAndService12b1FeesOverAssets none
Other expenses (including shareholder services fees) rr_OtherExpensesOverAssets 3.90%
Total annual fund operating expenses rr_ExpensesOverAssets 4.50%
Fee waiver and/or expense reimbursement rr_FeeWaiverOrReimbursementOverAssets (3.50%) [3]
Total annual fund operating expenses (after fee waiver and/or expense reimbursement) rr_NetExpensesOverAssets 1.00%
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 $ 671
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 1,558
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 2,453
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 4,731
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 671
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 1,558
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 2,453
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 4,731
Annual Return 2015 rr_AnnualReturn2015 (14.79%)
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 (19.67%)
Average Annual Returns, Since Inception rr_AverageAnnualReturnSinceInception (22.28%)
Average Annual Returns, Inception Date rr_AverageAnnualReturnInceptionDate Sep. 15, 2014
Dreyfus Strategic Beta Emerging Markets Equity Fund | Class A | After Taxes on Distributions  
Risk/Return: rr_RiskReturnAbstract  
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 (19.70%)
Average Annual Returns, Since Inception rr_AverageAnnualReturnSinceInception (22.36%)
Dreyfus Strategic Beta Emerging Markets Equity Fund | Class A | After Taxes on Distributions and Sale of Fund Shares  
Risk/Return: rr_RiskReturnAbstract  
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 (10.89%)
Average Annual Returns, Since Inception rr_AverageAnnualReturnSinceInception (18.79%)
Dreyfus Strategic Beta Emerging Markets 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_MaximumDeferredSalesChargeOverOther 1.00%
Redemption Fee (as a percentage of Amount Redeemed) rr_RedemptionFeeOverRedemption (2.00%)
Management fees rr_ManagementFeesOverAssets 0.60%
Distribution (12b-1) fees rr_DistributionAndService12b1FeesOverAssets 0.75%
Other expenses (including shareholder services fees) rr_OtherExpensesOverAssets 3.77%
Total annual fund operating expenses rr_ExpensesOverAssets 5.12%
Fee waiver and/or expense reimbursement rr_FeeWaiverOrReimbursementOverAssets (3.37%) [3]
Total annual fund operating expenses (after fee waiver and/or expense reimbursement) rr_NetExpensesOverAssets 1.75%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 278
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 1,234
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 2,287
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 4,910
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 178
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 1,234
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 2,287
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 4,910
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 (16.32%)
Average Annual Returns, Since Inception rr_AverageAnnualReturnSinceInception (19.29%)
Average Annual Returns, Inception Date rr_AverageAnnualReturnInceptionDate Sep. 15, 2014
Dreyfus Strategic Beta Emerging Markets 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_MaximumDeferredSalesChargeOverOther none
Redemption Fee (as a percentage of Amount Redeemed) rr_RedemptionFeeOverRedemption (2.00%)
Management fees rr_ManagementFeesOverAssets 0.60%
Distribution (12b-1) fees rr_DistributionAndService12b1FeesOverAssets none
Other expenses (including shareholder services fees) rr_OtherExpensesOverAssets 3.48%
Total annual fund operating expenses rr_ExpensesOverAssets 4.08%
Fee waiver and/or expense reimbursement rr_FeeWaiverOrReimbursementOverAssets (3.33%) [3]
Total annual fund operating expenses (after fee waiver and/or expense reimbursement) rr_NetExpensesOverAssets 0.75%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 77
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 935
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 1,810
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 4,067
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 77
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 935
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 1,810
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 4,067
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 (14.56%)
Average Annual Returns, Since Inception rr_AverageAnnualReturnSinceInception (18.45%)
Average Annual Returns, Inception Date rr_AverageAnnualReturnInceptionDate Sep. 15, 2014
Dreyfus Strategic Beta Emerging Markets Equity 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_MaximumDeferredSalesChargeOverOther none
Redemption Fee (as a percentage of Amount Redeemed) rr_RedemptionFeeOverRedemption (2.00%)
Management fees rr_ManagementFeesOverAssets 0.60%
Distribution (12b-1) fees rr_DistributionAndService12b1FeesOverAssets none
Other expenses (including shareholder services fees) rr_OtherExpensesOverAssets 1.49%
Total annual fund operating expenses rr_ExpensesOverAssets 2.09%
Fee waiver and/or expense reimbursement rr_FeeWaiverOrReimbursementOverAssets (1.34%) [3]
Total annual fund operating expenses (after fee waiver and/or expense reimbursement) rr_NetExpensesOverAssets 0.75%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 77
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 525
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 1,000
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 2,314
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 77
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 525
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 1,000
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 2,314
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 (14.55%)
Average Annual Returns, Since Inception rr_AverageAnnualReturnSinceInception (18.44%)
Average Annual Returns, Inception Date rr_AverageAnnualReturnInceptionDate Sep. 15, 2014
[1] For comparative purposes, the value of the Index as of 8/31/2014 is used as of the beginning value on 9/15/2014
[2] 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.
[3] The fund's investment adviser, The Dreyfus Corporation, has contractually agreed, until March 1, 2017, 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 .75%. On or after March 1, 2017, The Dreyfus Corporation may terminate this expense limitation at any time.