| 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 capital appreciation. |
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| 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. |
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| 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 | 2014-04-01 | ||||||
| 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 74.74% of the average value of its portfolio. |
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| Portfolio Turnover, Rate | rr_PortfolioTurnoverRate | 74.74% | ||||||
| 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-years examples are based on net operating expenses, which reflect the expense waiver/reimbursement by The Dreyfus Corporation. Although your actual costs may be higher or lower, based on these assumptions your costs would be: |
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| 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 stocks of small cap companies. The fund currently considers small cap companies to be those companies with market capitalizations that fall within the range of companies in the Russell 2000®Value Index. Because the fund may continue to hold a security whose market capitalization increases or decreases, a substantial portion of the fund's holdings can have market capitalizations outside the range of the Russell 2000® Value Index at any given time. The fund may invest up to 15% of its assets in foreign securities. The fund uses a "multi-manager" approach by selecting one or more subadvisers to manage the fund's assets. The fund may hire, terminate or replace subadvisers and modify material terms and conditions of subadvisory arrangements without shareholder approval. The fund's assets are currently allocated among seven subadvisers, each of which acts independently of the others and uses its own methodology to select portfolio investments. |
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| 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. Investments in foreign securities tend to have greater exposure to liquidity risk than domestic securities. · 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. · Multi-manager risk. Each subadviser makes investment decisions independently, and it is possible that the investment styles of the subadvisers may not complement one another. As a result, the fund's exposure to a given stock, industry or investment style could unintentionally be greater or smaller than it would have been if the fund had a single adviser. In addition, if one subadviser buys a security during a time frame when another subadviser sells it, the fund will incur transaction costs and the fund's net position in the security may be approximately the same as it would have been with a single adviser and no such sale and purchase. · Allocation risk. There can be no assurance that the allocation of the fund's assets among the subadvisers will be effective in achieving the fund's investment goal. · 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. |
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| 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 | 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. |
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| 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 Worst Quarter |
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| Highest Quarterly Return, Label | rr_HighestQuarterlyReturnLabel | Best Quarter | ||||||
| Highest Quarterly Return, Date | rr_BarChartHighestQuarterlyReturnDate | Sep. 30, 2009 | ||||||
| Highest Quarterly Return | rr_BarChartHighestQuarterlyReturn | 21.03% | ||||||
| Lowest Quarterly Return, Label | rr_LowestQuarterlyReturnLabel | Worst Quarter | ||||||
| Lowest Quarterly Return, Date | rr_BarChartLowestQuarterlyReturnDate | Sep. 30, 2011 | ||||||
| Lowest Quarterly Return | rr_BarChartLowestQuarterlyReturn | (22.22%) | ||||||
| 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. |
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| Caption | rr_AverageAnnualReturnCaption | Average Annual Total Returns (as of 12/31/12) | ||||||
|
Russell 2000®Value Index reflects no deduction for fees, expenses or taxes*
|
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| Risk/Return: | rr_RiskReturnAbstract | |||||||
| Average Annual Returns, 1 Year | rr_AverageAnnualReturnYear01 | 18.05% | [1] | |||||
| Average Annual Returns, Since Inception | rr_AverageAnnualReturnSinceInception | 13.76% | [1] | |||||
| Average Annual Returns, Inception Date | rr_AverageAnnualReturnInceptionDate | Dec. 31, 2008 | [1] | |||||
|
Class A
|
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| 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] | |||||
| Management fees | rr_ManagementFeesOverAssets | 0.90% | ||||||
| Distribution (Rule 12b-1) fees | rr_DistributionAndService12b1FeesOverAssets | none | ||||||
| Other expenses (including shareholder services fees) | rr_OtherExpensesOverAssets | 0.50% | ||||||
| Total annual fund operating expenses | rr_ExpensesOverAssets | 1.40% | [3] | |||||
| Fee waiver and/or expense reimbursement | rr_FeeWaiverOrReimbursementOverAssets | (0.10%) | ||||||
| Total annual fund operating expenses (after fee waiver and/or expense reimbursement) | rr_NetExpensesOverAssets | 1.30% | ||||||
| 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 | 700 | ||||||
| Expense Example, with Redemption, 3 Years | rr_ExpenseExampleYear03 | 983 | ||||||
| Expense Example, with Redemption, 5 Years | rr_ExpenseExampleYear05 | 1,288 | ||||||
| Expense Example, with Redemption, 10 Years | rr_ExpenseExampleYear10 | 2,150 | ||||||
| Expense Example, No Redemption, 1 Year | rr_ExpenseExampleNoRedemptionYear01 | 700 | ||||||
| Expense Example, No Redemption, 3 Years | rr_ExpenseExampleNoRedemptionYear03 | 983 | ||||||
| Expense Example, No Redemption, 5 Years | rr_ExpenseExampleNoRedemptionYear05 | 1,288 | ||||||
| Expense Example, No Redemption, 10 Years | rr_ExpenseExampleNoRedemptionYear10 | 2,150 | ||||||
| Annual Return 2009 | rr_AnnualReturn2009 | 29.51% | ||||||
| Annual Return 2010 | rr_AnnualReturn2010 | 27.63% | ||||||
| Annual Return 2011 | rr_AnnualReturn2011 | (5.37%) | ||||||
| Annual Return 2012 | rr_AnnualReturn2012 | 17.66% | ||||||
| Average Annual Returns, 1 Year | rr_AverageAnnualReturnYear01 | 10.90% | ||||||
| Average Annual Returns, Since Inception | rr_AverageAnnualReturnSinceInception | 15.24% | ||||||
| Average Annual Returns, Inception Date | rr_AverageAnnualReturnInceptionDate | Dec. 17, 2008 | ||||||
|
Class A | After Taxes on Distributions
|
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| Risk/Return: | rr_RiskReturnAbstract | |||||||
| Average Annual Returns, 1 Year | rr_AverageAnnualReturnYear01 | 9.85% | ||||||
| Average Annual Returns, Since Inception | rr_AverageAnnualReturnSinceInception | 14.10% | ||||||
|
Class A | After Taxes on Distributions and Sales
|
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| Risk/Return: | rr_RiskReturnAbstract | |||||||
| Average Annual Returns, 1 Year | rr_AverageAnnualReturnYear01 | 7.93% | ||||||
| Average Annual Returns, Since Inception | rr_AverageAnnualReturnSinceInception | 12.93% | ||||||
|
Class C
|
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| 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 | 0.90% | ||||||
| Distribution (Rule 12b-1) fees | rr_DistributionAndService12b1FeesOverAssets | 0.75% | ||||||
| Other expenses (including shareholder services fees) | rr_OtherExpensesOverAssets | 0.50% | ||||||
| Total annual fund operating expenses | rr_ExpensesOverAssets | 2.15% | [3] | |||||
| Fee waiver and/or expense reimbursement | rr_FeeWaiverOrReimbursementOverAssets | (0.10%) | ||||||
| Total annual fund operating expenses (after fee waiver and/or expense reimbursement) | rr_NetExpensesOverAssets | 2.05% | ||||||
| Expense Example, with Redemption, 1 Year | rr_ExpenseExampleYear01 | 308 | ||||||
| Expense Example, with Redemption, 3 Years | rr_ExpenseExampleYear03 | 663 | ||||||
| Expense Example, with Redemption, 5 Years | rr_ExpenseExampleYear05 | 1,145 | ||||||
| Expense Example, with Redemption, 10 Years | rr_ExpenseExampleYear10 | 2,475 | ||||||
| Expense Example, No Redemption, 1 Year | rr_ExpenseExampleNoRedemptionYear01 | 208 | ||||||
| Expense Example, No Redemption, 3 Years | rr_ExpenseExampleNoRedemptionYear03 | 663 | ||||||
| Expense Example, No Redemption, 5 Years | rr_ExpenseExampleNoRedemptionYear05 | 1,145 | ||||||
| Expense Example, No Redemption, 10 Years | rr_ExpenseExampleNoRedemptionYear10 | 2,475 | ||||||
| Average Annual Returns, 1 Year | rr_AverageAnnualReturnYear01 | 15.80% | ||||||
| Average Annual Returns, Since Inception | rr_AverageAnnualReturnSinceInception | 16.09% | ||||||
| Average Annual Returns, Inception Date | rr_AverageAnnualReturnInceptionDate | Dec. 17, 2008 | ||||||
|
Class I
|
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| 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 | 0.90% | ||||||
| Distribution (Rule 12b-1) fees | rr_DistributionAndService12b1FeesOverAssets | none | ||||||
| Other expenses (including shareholder services fees) | rr_OtherExpensesOverAssets | 0.09% | ||||||
| Total annual fund operating expenses | rr_ExpensesOverAssets | 0.99% | [3] | |||||
| Total annual fund operating expenses (after fee waiver and/or expense reimbursement) | rr_NetExpensesOverAssets | 0.99% | ||||||
| Expense Example, with Redemption, 1 Year | rr_ExpenseExampleYear01 | 101 | ||||||
| Expense Example, with Redemption, 3 Years | rr_ExpenseExampleYear03 | 315 | ||||||
| Expense Example, with Redemption, 5 Years | rr_ExpenseExampleYear05 | 547 | ||||||
| Expense Example, with Redemption, 10 Years | rr_ExpenseExampleYear10 | 1,213 | ||||||
| Expense Example, No Redemption, 1 Year | rr_ExpenseExampleNoRedemptionYear01 | 101 | ||||||
| Expense Example, No Redemption, 3 Years | rr_ExpenseExampleNoRedemptionYear03 | 315 | ||||||
| Expense Example, No Redemption, 5 Years | rr_ExpenseExampleNoRedemptionYear05 | 547 | ||||||
| Expense Example, No Redemption, 10 Years | rr_ExpenseExampleNoRedemptionYear10 | $ 1,213 | ||||||
| Average Annual Returns, 1 Year | rr_AverageAnnualReturnYear01 | 18.08% | ||||||
| Average Annual Returns, Since Inception | rr_AverageAnnualReturnSinceInception | 17.31% | ||||||
| Average Annual Returns, Inception Date | rr_AverageAnnualReturnInceptionDate | Dec. 17, 2008 | ||||||
|
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