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Label Element Value
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 surpass the performance of the Russell Midcap® Value Index.

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 9 of this 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 71.25% of the average value of its portfolio.

Portfolio Turnover, Rate rr_PortfolioTurnoverRate 71.25%
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 mid-cap stocks with market capitalizations between $1 billion and $25 billion at the time of purchase. Because the fund may continue to hold a security whose market capitalization grows, a substantial portion of the fund's holdings can have market capitalizations in excess of $25 billion at any given time. The fund's portfolio managers identify potential investments through extensive quantitative and fundamental research. The fund focuses on individual stock selection (a "bottom-up" approach), emphasizing three key factors: relative value, business health, and business momentum.


In constructing the fund's portfolio, the fund's portfolio managers use an opportunistic value approach to identify stocks whose current market prices trade at a large discount to their intrinsic value, as calculated by the portfolio managers. Intrinsic value is based on the combination of the valuation assessment of the company's operating divisions with its economic balance sheet. The opportunistic value style attempts to benefit from valuation inefficiencies and underappreciated fundamental prospects present in the marketplace. To do this, the portfolio managers use mid-cycle estimates, growth prospects, the identification of a revaluation catalyst and competitive advantages as some of the factors in the valuation assessment. Additionally, a company's stated and hidden liabilities and assets are included in the portfolio managers' economic balance sheet calculation for the company.

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 weakness in the stock market or because of factors that affect the company or its particular industry.


· Small and midsize company risk. Small and midsize companies carry 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.


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


· 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.

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. 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.


Since the fund's Class Y shares are new, past performance information is not available for Class Y shares as of the date of this prospectus. Class Y shares would have had substantially similar annual returns as Class A, C and I shares because 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 do not have the same expenses.

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
Q2, 2003: 26.41%


Worst Quarter
Q3, 2011: -24.80%


The year-to-date total return of the fund's Class A shares as of March 31, 2013 was 13.67%.

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 Mar. 31, 2013
Bar Chart, Year to Date Return rr_BarChartYearToDateReturn 13.67%
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Best Quarter
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Jun. 30, 2003
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 26.41%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Worst Quarter
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Sep. 30, 2011
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (24.80%)
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.


For the fund's Class C and I shares, periods prior to May 30, 2008 reflect the performance of the fund's Class A shares adjusted to reflect each share class' applicable sales charge. Such performance figures have not been adjusted, however, to reflect applicable class fees and expenses; if such fees and expenses had been reflected, the performance shown for Class C shares for such periods may have been lower.

Caption rr_AverageAnnualReturnCaption Average Annual Total Returns (as of 12/31/12)
Russell Midcap Value Index reflects no deduction for fees, expenses or taxes
  
Risk/Return: rr_RiskReturnAbstract  
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 18.51%
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 3.79%
Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10 10.63%
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 [1]
Management fees rr_ManagementFeesOverAssets 0.75%
Distribution (12b-1) fees rr_DistributionAndService12b1FeesOverAssets none
Other expenses (including shareholder services fees) rr_OtherExpensesOverAssets 0.47% [2]
Total annual fund operating expenses rr_ExpensesOverAssets 1.22%
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 692
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 940
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 1,207
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 1,967
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 692
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 940
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 1,207
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 1,967
Annual Return 2003 rr_AnnualReturn2003 57.50%
Annual Return 2004 rr_AnnualReturn2004 17.53%
Annual Return 2005 rr_AnnualReturn2005 8.07%
Annual Return 2006 rr_AnnualReturn2006 10.44%
Annual Return 2007 rr_AnnualReturn2007 5.47%
Annual Return 2008 rr_AnnualReturn2008 (39.84%)
Annual Return 2009 rr_AnnualReturn2009 61.76%
Annual Return 2010 rr_AnnualReturn2010 25.07%
Annual Return 2011 rr_AnnualReturn2011 (5.81%)
Annual Return 2012 rr_AnnualReturn2012 19.41%
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 12.53%
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 5.23%
Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10 11.64%
Average Annual Returns, Inception Date rr_AverageAnnualReturnInceptionDate Sep. 29, 1995
Class A | After Taxes on Distributions
  
Risk/Return: rr_RiskReturnAbstract  
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 12.48%
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 4.65%
Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10 10.50%
Class A | After Taxes on Distributions and Sale of Fund Shares
  
Risk/Return: rr_RiskReturnAbstract  
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 8.19%
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 4.39%
Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10 9.99%
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 0.75%
Distribution (12b-1) fees rr_DistributionAndService12b1FeesOverAssets 0.75%
Other expenses (including shareholder services fees) rr_OtherExpensesOverAssets 0.53% [2]
Total annual fund operating expenses rr_ExpensesOverAssets 2.03%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 306
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 637
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 1,093
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 2,358
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 206
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 637
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 1,093
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 2,358
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 17.45%
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 5.68%
Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10 11.88%
Average Annual Returns, Inception Date rr_AverageAnnualReturnInceptionDate May 30, 2008
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 0.75%
Distribution (12b-1) fees rr_DistributionAndService12b1FeesOverAssets none
Other expenses (including shareholder services fees) rr_OtherExpensesOverAssets 0.25% [2]
Total annual fund operating expenses rr_ExpensesOverAssets 1.00%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 102
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 318
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 552
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 1,225
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 102
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 318
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 552
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 1,225
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 19.59%
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 6.70%
Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10 12.41%
Average Annual Returns, Inception Date rr_AverageAnnualReturnInceptionDate May 30, 2008
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
Management fees rr_ManagementFeesOverAssets 0.75%
Distribution (12b-1) fees rr_DistributionAndService12b1FeesOverAssets none
Other expenses (including shareholder services fees) rr_OtherExpensesOverAssets 0.06% [2]
Total annual fund operating expenses rr_ExpensesOverAssets 0.81%
Other Expenses, New Fund, Based on Estimates [Text] rr_OtherExpensesNewFundBasedOnEstimates Other expenses for Class Y are based on estimated amounts for the current fiscal year.
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 83
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 259
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 450
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 1,002
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 83
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 259
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 450
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 1,002
Performance One Year or Less [Text] rr_PerformanceOneYearOrLess Since the fund's Class Y shares are new, past performance information is not available for Class Y shares as of the date of this prospectus.
[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.
[2] Other expenses for Class Y are based on estimated amounts for the current fiscal year.