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Dreyfus Technology 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 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 the fund or certain other 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 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 67.23% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 67.23%
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 certain other funds in the Dreyfus Family of Funds.
Expense Breakpoint, Minimum Investment Required [Amount] rr_ExpenseBreakpointMinimumInvestmentRequiredAmount $ 50,000
Other Expenses, New Fund, Based on Estimates [Text] rr_OtherExpensesNewFundBasedOnEstimates Other expenses for Class Y are estimated amounts for the current fiscal year based on the Other expenses for Class I.
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 stocks of growth companies of any size that The Dreyfus Corporation believes to be leading producers or beneficiaries of technological innovation. Up to 25% of the fund's assets may be invested in foreign securities. In choosing stocks, the fund looks for technology companies with the potential for strong earnings or revenue growth rates. The fund's investment process centers on a multi-dimensional approach that looks for opportunities across emerging growth, cyclical or stable growth companies.
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.


· Technology company risk. The technology sector has been among the most volatile sectors of the stock market. Because the fund's investments are concentrated in the technology sector, its performance will be significantly affected by developments in that sector. Technology companies, especially small-cap technology companies, involve greater risk because their revenue and/or earnings tend to be less predictable (and some companies may be experiencing significant losses) and their share prices tend to be more volatile. Certain technology companies may have limited product lines, markets or financial resources, or may depend on a limited management group. In addition, these companies are strongly affected by worldwide technological developments, and their products and services may not be economically successful or may quickly become outdated. Investor perception may play a greater role in determining the day-to-day value of tech stocks than it does in other sectors. Fund investments made in anticipation of future products and services may decline dramatically in value if the anticipated products or services are delayed or cancelled. The risks associated with technology companies are magnified in the case of small-cap technology companies. The shares of smaller technology companies tend to trade less frequently than those of larger, more established companies, which can have an adverse effect on the pricing of these securities and on the fund's ability to sell these securities.


· 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.


· 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.


· Growth stock risk. 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.


· 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.


· 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 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 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. The total returns also are compared to the Morgan Stanley High Technology 35 Index, which is designed to measure the performance of a cross section of highly capitalized U.S. companies that are active in nine technology subsectors, to show how the fund's performance compares to an index of technology stocks. 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 Additional Market Index [Text] rr_PerformanceAdditionalMarketIndex The total returns also are compared to the Morgan Stanley High Technology 35 Index, which is designed to measure the performance of a cross section of highly capitalized U.S. companies that are active in nine technology subsectors, to show how the fund's performance compares to an index of technology stocks.
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, 2010: 22.71%


Worst Quarter
Q4, 2008: -22.17%


The year-to-date total return of the fund's Class A shares as of June 30, 2016 was -1.49%.
Year to Date Return, Label rr_YearToDateReturnLabel year-to-date total return of the fund's Class A shares
Bar Chart, Year to Date Return, Date rr_BarChartYearToDateReturnDate Jun. 30, 2016
Bar Chart, Year to Date Return rr_BarChartYearToDateReturn (1.49%)
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Best Quarter
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Sep. 30, 2010
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 22.71%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Worst Quarter
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Dec. 31, 2008
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (22.17%)
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 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.


For the fund's Class Y shares, periods prior to the inception date reflect the performance of the fund's Class I 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 do not have the same expenses.
Caption rr_AverageAnnualReturnCaption Average Annual Total Returns (as of 12/31/15)
Dreyfus Technology Growth Fund | S&P 500® Index reflects no deduction for fees, expenses or taxes  
Risk/Return: rr_RiskReturnAbstract  
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 1.39%
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 12.55%
Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10 7.30%
Dreyfus Technology Growth Fund | Morgan Stanley High Technology 35 Index reflects no deduction for fees, expenses or taxes  
Risk/Return: rr_RiskReturnAbstract  
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 8.17%
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 11.84%
Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10 8.75%
Dreyfus Technology 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_MaximumDeferredSalesChargeOverOther none [1]
Management fees rr_ManagementFeesOverAssets 0.75%
Distribution (12b-1) fees rr_DistributionAndService12b1FeesOverAssets none
Other expenses (including shareholder services fees) rr_OtherExpensesOverAssets 0.53%
Total annual fund operating expenses rr_ExpensesOverAssets 1.28%
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 $ 698
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 958
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 1,237
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 2,031
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 698
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 958
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 1,237
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 2,031
Annual Return 2006 rr_AnnualReturn2006 3.55%
Annual Return 2007 rr_AnnualReturn2007 13.12%
Annual Return 2008 rr_AnnualReturn2008 (42.36%)
Annual Return 2009 rr_AnnualReturn2009 55.30%
Annual Return 2010 rr_AnnualReturn2010 29.54%
Annual Return 2011 rr_AnnualReturn2011 (8.09%)
Annual Return 2012 rr_AnnualReturn2012 15.51%
Annual Return 2013 rr_AnnualReturn2013 32.58%
Annual Return 2014 rr_AnnualReturn2014 6.70%
Annual Return 2015 rr_AnnualReturn2015 5.64%
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 (0.44%)
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 8.38%
Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10 7.34%
Dreyfus Technology Growth Fund | Class A | After Taxes on Distributions  
Risk/Return: rr_RiskReturnAbstract  
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 (1.89%)
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 7.02%
Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10 6.67%
Dreyfus Technology Growth Fund | Class A | After Taxes on Distributions and Sale of Fund Shares  
Risk/Return: rr_RiskReturnAbstract  
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 0.95%
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 6.68%
Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10 6.19%
Dreyfus Technology 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_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 0.58%
Total annual fund operating expenses rr_ExpensesOverAssets 2.08%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 311
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 652
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 1,119
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 2,410
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 211
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 652
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 1,119
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 2,410
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 3.82%
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 8.78%
Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10 7.05%
Dreyfus Technology 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_MaximumDeferredSalesChargeOverOther none
Management fees rr_ManagementFeesOverAssets 0.75%
Distribution (12b-1) fees rr_DistributionAndService12b1FeesOverAssets none
Other expenses (including shareholder services fees) rr_OtherExpensesOverAssets 0.27%
Total annual fund operating expenses rr_ExpensesOverAssets 1.02%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 104
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 325
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 563
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 1,248
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 104
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 325
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 563
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 1,248
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 5.91%
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 10.00%
Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10 8.35%
Dreyfus Technology 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_MaximumDeferredSalesChargeOverOther none
Management fees rr_ManagementFeesOverAssets 0.75%
Distribution (12b-1) fees rr_DistributionAndService12b1FeesOverAssets none
Other expenses (including shareholder services fees) rr_OtherExpensesOverAssets 0.12% [2]
Total annual fund operating expenses rr_ExpensesOverAssets 0.87%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 89
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 278
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 482
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 1,073
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 89
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 278
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 482
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 1,073
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 5.91%
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 10.00%
Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10 8.35%
Average Annual Returns, Inception Date rr_AverageAnnualReturnInceptionDate Sep. 30, 2016
[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 estimated amounts for the current fiscal year based on the Other expenses for Class I.