485BPOS

File No. 33-51061

811-7123

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM N-1A

REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933[X]

Pre-Effective Amendment No.[__]

Post-Effective Amendment No. 108[X]

and/or

REGISTRATION STATEMENT UNDER THE INVESTMENT COMPANY ACT OF 1940[X]

Amendment No. 108[X]

(Check appropriate box or boxes.)

Advantage Funds, Inc.

(Exact Name of Registrant as Specified in Charter)

c/o The Dreyfus Corporation

200 Park Avenue, New York, New York 10166

(Address of Principal Executive Offices) (Zip Code)

Registrant's Telephone Number, including Area Code: (212) 922-6000

Janette Farragher, Esq.

200 Park Avenue

New York, New York 10166

(Name and Address of Agent for Service)

It is proposed that this filing will become effective (check appropriate box)

X__ immediately upon filing pursuant to paragraph (b)

_____on (date) pursuant to paragraph (b)

_____ (days) days after filing pursuant to paragraph (a)(1)

_____on (date) pursuant to paragraph (a)(1)

_____ (days) days after filing pursuant to paragraph (a)(2)

_____on (date) pursuant to paragraph (a)(2) of Rule 485

If appropriate, check the following box:

_____this post-effective amendment designates a new effective date for a previously filed post-effective amendment.

SIGNATURES

Pursuant to the requirements of the Securities Act of 1933 and the Investment Company Act of 1940, the Registrant certifies that it meets all of the requirements for effectiveness of this Amendment to the Registration Statement pursuant to Rule 485(b) under the Securities Act of 1933 and has duly caused this Amendment to the Registration Statement to be signed on its behalf by the undersigned, duly authorized, in the City of New York, and State of New York on the 11th day of January 2013.

Advantage Funds, Inc.

BY:	/s/ Bradley J. Skapyak*
	Bradley J. Skapyak, PRESIDENT

Pursuant to the requirements of the Securities Act of 1933, this Amendment to the Registration Statement has been signed below by the following persons in the capacities and on the date indicated.

Signatures	Title	Date
/s/ Bradley J. Skapyak*	President (Principal Executive Officer)	01/11/2013
Bradley J. Skapyak
/s/ James Windels*	Treasurer (Principal Financial and Accounting Officer)	01/11/2013
James Windels
/s/ Joseph S. DiMartino*	Chairman of the Board	01/11/2013
Joseph S. DiMartino
/s/ Peggy C. Davis*	Board Member	01/11/2013
Peggy C. Davis
/s/ David P. Feldman*	Board Member	01/11/2013
David P. Feldman
/s/ Ehud Houminer*	Board Member	01/11/2013
Ehud Houminer
/s/ Lynn Martin*	Board Member	01/11/2013
Lynn Martin
/s/ Robin A. Melvin*	Board Member	01/11/2013
Robin A. Melvin
/s/ Martin Peretz*	Board Member	01/11/2013
Martin Peretz

/s/ Philip L. Toia*	Board Member	01/11/2013
Philip L. Toia

*BY:	/s/ Janette Farragher
	Janette Farragher Attorney-in-Fact

INDEX OF EXHIBITS

Exhibits

EX-101.INS – Instance Document.

EX-101.SCH – Taxonomy.

EX-101.CAL – Calculation Linkbase.

EX-101.DEF – Definition Linkbase.

EX-101.LAB – Labels Linkbase.

EX-101.PRE – Presentation Linkbase.

XML

Dreyfus Technology Growth Fund (Prospectus Summary) | Dreyfus Technology Growth Fund

Fund Summary

Investment Objective

The fund seeks capital appreciation.

Fees and Expenses

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 on page 9 of the Prospectus and in the How to Buy Shares section
and the Additional Information About How to Buy Shares section on page II-1 and
page III-1, respectively, of the fund's Statement of Additional Information.
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.

Shareholder Fees (fees paid directly from your investment)

Shareholder Fees Dreyfus Technology Growth Fund	Class A	Class C	Class I
Maximum sales charge (load) imposed on purchases (as a percentage of offering price)	5.75%	none	none
Maximum deferred sales charge (load) (as a percentage of lower of purchase or sale price)	none	1.00%	none

Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)

Annual Fund Operating Expenses Dreyfus Technology Growth Fund	Class A	Class C	Class I
Management fees	0.75%	0.75%	0.75%
Distribution (12b-1) fees	none	0.75%	none
Other expenses (including shareholder services fees)	0.70%	0.77%	0.33%
Total annual fund operating expenses	1.45%	2.27%	1.08%

Example

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 Dreyfus Technology Growth Fund (USD $)	Expense Example, with Redemption, 1 Year	Expense Example, with Redemption, 3 Years	Expense Example, with Redemption, 5 Years	Expense Example, with Redemption, 10 Years
Class A	714	1,007	1,322	2,210
Class C	330	709	1,215	2,605
Class I	110	343	595	1,317

You would pay the following expenses if you did not redeem your shares:

Expense Example, No Redemption Dreyfus Technology Growth Fund (USD $)	Expense Example, No Redemption, 1 Year	Expense Example, No Redemption, 3 Years	Expense Example, No Redemption, 5 Years	Expense Example, No Redemption, 10 Years
Class A	714	1,007	1,322	2,210
Class C	230	709	1,215	2,605
Class I	110	343	595	1,317

Portfolio Turnover

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
69.20% of the average value of its portfolio.

Principal Investment Strategy

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.

Principal Risks

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.

o 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.

o 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.

o 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.

o 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.

o Foreign investment risk. 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.

o Liquidity risk. When there is little or no active trading market for a security,
the fund may not be able to sell the security in a timely manner at its perceived
value, which could cause the fund's share price to fall.

Performance

The following bar chart and table provide some indication of the risks of
investing in the fund. 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.

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.

Year-by-Year Total Returns as of 12/31 each year (%) -- Class A

Best Quarter
Q2, 2003: 25.35%
Worst Quarter
Q3, 2002: -26.74%

The year-to-date total return of the fund's Class A shares as
of 9/30/12 was 16.65%.

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 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.

Average Annual Total Returns (as of 12/31/11)

Average Annual Total Returns Dreyfus Technology Growth Fund	Label	1 Year	5 Years	10 Years
Class A	Class A returns before taxes	(13.37%)	2.59%	1.17%
Class A After Taxes on Distributions	Class A returns after taxes on distributions	(13.37%)	2.59%	1.17%
Class A After Taxes on Distributions and Sales	Class A returns after taxes on distributions and sale of fund shares	(8.69%)	2.22%	1.00%
Class C	Class C returns before taxes	(9.74%)	2.87%	0.84%
Class I	Class I returns before taxes	(7.73%)	4.22%	2.20%
Morgan Stanley High Technology 35 Index	Morgan Stanley High Technology 35 Index reflects no deduction for fees, expenses or taxes	(10.28%)	1.64%	2.17%
Standard & Poor's 500 Composite Stock Price Index	Standard & Poor's 500 Composite Stock Price Index reflects no deduction for fees, expenses or taxes	2.09%	(0.25%)	2.92%

XML

Label	Element	Value
Risk Return [Abstract]	rr_RiskReturnAbstract
ProspectusDate	rr_ProspectusDate	Jan. 01, 2013
Dreyfus Strategic Value Fund (Prospectus Summary) | Dreyfus Strategic Value Fund
Risk Return [Abstract]	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 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 on page 7 of the Prospectus and in the How to Buy Shares section and the Additional Information About How to Buy Shares section on page II-1 and page III-1, respectively, of the fund's Statement of Additional Information. 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.
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 95.38% of the average value of its portfolio.
Portfolio Turnover, Rate	rr_PortfolioTurnoverRate	95.38%
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:
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 stocks. The fund's portfolio managers identify potential investments through extensive quantitative and fundamental research. The fund may invest up to 30% of its assets in foreign securities. The fund will focus on individual stock selection (a "bottom-up" approach), emphasizing three key factors: value, sound business fundamentals and positive business momentum.
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. o 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. o 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. o 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. o Foreign investment risk. 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.
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 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 Narrative [Text Block]	rr_BarChartNarrativeTextBlock	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.
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: 19.26% Worst Quarter Q3, 2002: -23.95% The year-to-date total return of the fund's Class A shares as of 9/30/12 was 13.99%.
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 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 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.
Caption	rr_AverageAnnualReturnCaption	Average Annual Total Returns (as of 12/31/11)
Dreyfus Strategic Value Fund (Prospectus Summary) | Dreyfus Strategic Value Fund | Russell 1000 Value Index
Risk Return [Abstract]	rr_RiskReturnAbstract
Label	rr_AverageAnnualReturnLabel	Russell 1000 Value Index reflects no deduction for fees, expenses or taxes
1 Year	rr_AverageAnnualReturnYear01	0.39%
5 Years	rr_AverageAnnualReturnYear05	(2.64%)
10 Years	rr_AverageAnnualReturnYear10	3.89%
Dreyfus Strategic Value Fund (Prospectus Summary) | Dreyfus Strategic Value Fund | Class A
Risk Return [Abstract]	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
Management fees	rr_ManagementFeesOverAssets	0.75%
Distribution (12b-1) fees	rr_DistributionAndService12b1FeesOverAssets	none
Other expenses (including shareholder services fees)	rr_OtherExpensesOverAssets	0.45%
Total annual fund operating expenses	rr_ExpensesOverAssets	1.20%	[1]
Fee waiver and/or expense reimbursement	rr_FeeWaiverOrReimbursementOverAssets	(0.22%)
Total annual fund operating expenses (after fee waiver and/or expense reimbursement)	rr_NetExpensesOverAssets	0.98%
Fee Waiver or Reimbursement over Assets, Date of Termination	rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination	2013-12-31
Expense Example, with Redemption, 1 Year	rr_ExpenseExampleYear01	669
Expense Example, with Redemption, 3 Years	rr_ExpenseExampleYear03	914
Expense Example, with Redemption, 5 Years	rr_ExpenseExampleYear05	1,177
Expense Example, with Redemption, 10 Years	rr_ExpenseExampleYear10	1,928
Expense Example, No Redemption, 1 Year	rr_ExpenseExampleNoRedemptionYear01	669
Expense Example, No Redemption, 3 Years	rr_ExpenseExampleNoRedemptionYear03	914
Expense Example, No Redemption, 5 Years	rr_ExpenseExampleNoRedemptionYear05	1,177
Expense Example, No Redemption, 10 Years	rr_ExpenseExampleNoRedemptionYear10	1,928
Annual Return 2002	rr_AnnualReturn2002	(26.81%)
Annual Return 2003	rr_AnnualReturn2003	43.54%
Annual Return 2004	rr_AnnualReturn2004	17.59%
Annual Return 2005	rr_AnnualReturn2005	8.26%
Annual Return 2006	rr_AnnualReturn2006	19.96%
Annual Return 2007	rr_AnnualReturn2007	5.87%
Annual Return 2008	rr_AnnualReturn2008	(36.01%)
Annual Return 2009	rr_AnnualReturn2009	24.83%
Annual Return 2010	rr_AnnualReturn2010	15.02%
Annual Return 2011	rr_AnnualReturn2011	(6.23%)
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	Sep. 30, 2012
Bar Chart, Year to Date Return	rr_BarChartYearToDateReturn	13.99%
Highest Quarterly Return, Label	rr_HighestQuarterlyReturnLabel	Best Quarter
Highest Quarterly Return, Date	rr_BarChartHighestQuarterlyReturnDate	Jun. 30, 2003
Highest Quarterly Return	rr_BarChartHighestQuarterlyReturn	19.26%
Lowest Quarterly Return, Label	rr_LowestQuarterlyReturnLabel	Worst Quarter
Lowest Quarterly Return, Date	rr_BarChartLowestQuarterlyReturnDate	Sep. 30, 2002
Lowest Quarterly Return	rr_BarChartLowestQuarterlyReturn	(23.95%)
Label	rr_AverageAnnualReturnLabel	Class A returns before taxes
1 Year	rr_AverageAnnualReturnYear01	(11.63%)
5 Years	rr_AverageAnnualReturnYear05	(2.98%)
10 Years	rr_AverageAnnualReturnYear10	3.27%
Dreyfus Strategic Value Fund (Prospectus Summary) | Dreyfus Strategic Value Fund | Class A | After Taxes on Distributions
Risk Return [Abstract]	rr_RiskReturnAbstract
Label	rr_AverageAnnualReturnLabel	Class A returns after taxes on distributions
1 Year	rr_AverageAnnualReturnYear01	(11.73%)
5 Years	rr_AverageAnnualReturnYear05	(3.30%)
10 Years	rr_AverageAnnualReturnYear10	2.80%
Dreyfus Strategic Value Fund (Prospectus Summary) | Dreyfus Strategic Value Fund | Class A | After Taxes on Distributions and Sales
Risk Return [Abstract]	rr_RiskReturnAbstract
Label	rr_AverageAnnualReturnLabel	Class A returns after taxes on distributions and sale of fund shares
1 Year	rr_AverageAnnualReturnYear01	(7.43%)
5 Years	rr_AverageAnnualReturnYear05	(2.53%)
10 Years	rr_AverageAnnualReturnYear10	2.73%
Dreyfus Strategic Value Fund (Prospectus Summary) | Dreyfus Strategic Value Fund | Class C
Risk Return [Abstract]	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	0.47%
Total annual fund operating expenses	rr_ExpensesOverAssets	1.97%	[1]
Fee waiver and/or expense reimbursement	rr_FeeWaiverOrReimbursementOverAssets	(0.24%)
Total annual fund operating expenses (after fee waiver and/or expense reimbursement)	rr_NetExpensesOverAssets	1.73%
Fee Waiver or Reimbursement over Assets, Date of Termination	rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination	2013-12-31
Expense Example, with Redemption, 1 Year	rr_ExpenseExampleYear01	276
Expense Example, with Redemption, 3 Years	rr_ExpenseExampleYear03	595
Expense Example, with Redemption, 5 Years	rr_ExpenseExampleYear05	1,040
Expense Example, with Redemption, 10 Years	rr_ExpenseExampleYear10	2,276
Expense Example, No Redemption, 1 Year	rr_ExpenseExampleNoRedemptionYear01	176
Expense Example, No Redemption, 3 Years	rr_ExpenseExampleNoRedemptionYear03	595
Expense Example, No Redemption, 5 Years	rr_ExpenseExampleNoRedemptionYear05	1,040
Expense Example, No Redemption, 10 Years	rr_ExpenseExampleNoRedemptionYear10	2,276
Label	rr_AverageAnnualReturnLabel	Class C returns before taxes
1 Year	rr_AverageAnnualReturnYear01	(7.85%)
5 Years	rr_AverageAnnualReturnYear05	(2.55%)
10 Years	rr_AverageAnnualReturnYear10	3.15%
Dreyfus Strategic Value Fund (Prospectus Summary) | Dreyfus Strategic Value Fund | Class I
Risk Return [Abstract]	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	0.22%
Total annual fund operating expenses	rr_ExpensesOverAssets	0.97%	[1]
Fee waiver and/or expense reimbursement	rr_FeeWaiverOrReimbursementOverAssets	(0.24%)
Total annual fund operating expenses (after fee waiver and/or expense reimbursement)	rr_NetExpensesOverAssets	0.73%
Fee Waiver or Reimbursement over Assets, Date of Termination	rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination	2013-12-31
Expense Example, with Redemption, 1 Year	rr_ExpenseExampleYear01	75
Expense Example, with Redemption, 3 Years	rr_ExpenseExampleYear03	285
Expense Example, with Redemption, 5 Years	rr_ExpenseExampleYear05	513
Expense Example, with Redemption, 10 Years	rr_ExpenseExampleYear10	1,168
Expense Example, No Redemption, 1 Year	rr_ExpenseExampleNoRedemptionYear01	75
Expense Example, No Redemption, 3 Years	rr_ExpenseExampleNoRedemptionYear03	285
Expense Example, No Redemption, 5 Years	rr_ExpenseExampleNoRedemptionYear05	513
Expense Example, No Redemption, 10 Years	rr_ExpenseExampleNoRedemptionYear10	1,168
Label	rr_AverageAnnualReturnLabel	Class I returns before taxes
1 Year	rr_AverageAnnualReturnYear01	(6.00%)
5 Years	rr_AverageAnnualReturnYear05	(1.63%)
10 Years	rr_AverageAnnualReturnYear10	4.11%

[1] The Dreyfus Corporation has contractually agreed to waive receipt of its fees and/or assume the expenses of the fund until at least December 31, 2013, so that the total annual fund operating expenses of Class A, Class C, and Class I shares (excluding taxes, interest, brokerage commissions, commitment fees on borrowings and extraordinary expenses) do not exceed .98%, 1.73%, and .73%, respectively. On or after December 31, 2013, The Dreyfus Corporation may terminate this expense waiver at any time.

XML

Label	Element	Value
Risk Return [Abstract]	rr_RiskReturnAbstract
ProspectusDate	rr_ProspectusDate	Jan. 01, 2013
Dreyfus International Value Fund (Prospectus Summary) | Dreyfus International Value Fund
Risk Return [Abstract]	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.
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 on page 8 of the Prospectus and in the How to Buy Shares section and the Additional Information About How to Buy Shares section on page II-1 and page III-1, respectively, of the fund's Statement of Additional Information. 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.
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 40.93% of the average value of its portfolio.
Portfolio Turnover, Rate	rr_PortfolioTurnoverRate	40.93%
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 stocks. The fund ordinarily invests most of its assets in securities of foreign companies that The Dreyfus Corporation considers to be value companies. In selecting stocks, the fund's portfolio managers identify potential investments through extensive quantitative and fundamental research. Emphasizing individual stock selection rather than economic and industry trends, the fund focuses on three key factors: value, business health and business momentum.
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. o Foreign investment risk. The fund's performance may 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. o Foreign currency risk. Investments in foreign currencies are subject to the risk that those currencies will decline in value relative to the U.S. dollar or, in the case of hedged positions, that the U.S. dollar will decline relative to the currency being hedged. Currency exchange rates may fluctuate significantly over short periods of time. Foreign currencies are also subject to risks caused by inflation, interest rates, budget deficits and low savings rates, political factors and government intervention and controls. o 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. o 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. o Liquidity risk. When there is little or no active trading market for a security, the fund may not be able to sell the security in a timely manner at its perceived value, which could cause the fund's share price to fall. 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 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 Narrative [Text Block]	rr_BarChartNarrativeTextBlock	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.
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, 2009: 24.48% Worst Quarter Q3, 2011: -21.42% The year-to-date total return of the fund's Class A shares as of 9/30/12 was 6.59%.
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 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 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 November 15, 2002 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 12/31/11)
Dreyfus International Value Fund (Prospectus Summary) | Dreyfus International Value Fund | MSCI Europe, Australasia, Far East (EAFE) Index (ND)
Risk Return [Abstract]	rr_RiskReturnAbstract
Label	rr_AverageAnnualReturnLabel	MSCI Europe, Australasia, Far East (EAFE) Index (ND) reflects no deduction for fees, expenses or taxes
1 Year	rr_AverageAnnualReturnYear01	(12.14%)
5 Years	rr_AverageAnnualReturnYear05	4.72%
10 Years	rr_AverageAnnualReturnYear10	4.67%
Dreyfus International Value Fund (Prospectus Summary) | Dreyfus International Value Fund | Class A
Risk Return [Abstract]	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
Management fees	rr_ManagementFeesOverAssets	1.00%
Distribution (12b-1) fees	rr_DistributionAndService12b1FeesOverAssets	none
Other expenses (including shareholder services fees)	rr_OtherExpensesOverAssets	0.63%
Total annual fund operating expenses	rr_ExpensesOverAssets	1.63%	[1]
Fee Waiver or Reimbursement over Assets, Date of Termination	rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination	2013-03-31
Expense Example, with Redemption, 1 Year	rr_ExpenseExampleYear01	731
Expense Example, with Redemption, 3 Years	rr_ExpenseExampleYear03	1,060
Expense Example, with Redemption, 5 Years	rr_ExpenseExampleYear05	1,411
Expense Example, with Redemption, 10 Years	rr_ExpenseExampleYear10	2,397
Expense Example, No Redemption, 1 Year	rr_ExpenseExampleNoRedemptionYear01	731
Expense Example, No Redemption, 3 Years	rr_ExpenseExampleNoRedemptionYear03	1,060
Expense Example, No Redemption, 5 Years	rr_ExpenseExampleNoRedemptionYear05	1,411
Expense Example, No Redemption, 10 Years	rr_ExpenseExampleNoRedemptionYear10	2,397
Annual Return 2002	rr_AnnualReturn2002	(11.23%)
Annual Return 2003	rr_AnnualReturn2003	38.63%
Annual Return 2004	rr_AnnualReturn2004	19.80%
Annual Return 2005	rr_AnnualReturn2005	11.19%
Annual Return 2006	rr_AnnualReturn2006	22.43%
Annual Return 2007	rr_AnnualReturn2007	4.13%
Annual Return 2008	rr_AnnualReturn2008	(38.21%)
Annual Return 2009	rr_AnnualReturn2009	30.03%
Annual Return 2010	rr_AnnualReturn2010	4.02%
Annual Return 2011	rr_AnnualReturn2011	(17.94%)
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	Sep. 30, 2012
Bar Chart, Year to Date Return	rr_BarChartYearToDateReturn	6.59%
Highest Quarterly Return, Label	rr_HighestQuarterlyReturnLabel	Best Quarter
Highest Quarterly Return, Date	rr_BarChartHighestQuarterlyReturnDate	Jun. 30, 2009
Highest Quarterly Return	rr_BarChartHighestQuarterlyReturn	24.48%
Lowest Quarterly Return, Label	rr_LowestQuarterlyReturnLabel	Worst Quarter
Lowest Quarterly Return, Date	rr_BarChartLowestQuarterlyReturnDate	Sep. 30, 2011
Lowest Quarterly Return	rr_BarChartLowestQuarterlyReturn	(21.42%)
Label	rr_AverageAnnualReturnLabel	Class A returns before taxes
1 Year	rr_AverageAnnualReturnYear01	(22.65%)
5 Years	rr_AverageAnnualReturnYear05	(7.61%)
10 Years	rr_AverageAnnualReturnYear10	3.05%
Inception Date	rr_AverageAnnualReturnInceptionDate	Sep. 29, 1995
Dreyfus International Value Fund (Prospectus Summary) | Dreyfus International Value Fund | Class A | After Taxes on Distributions
Risk Return [Abstract]	rr_RiskReturnAbstract
Label	rr_AverageAnnualReturnLabel	Class A returns after taxes on distributions
1 Year	rr_AverageAnnualReturnYear01	(22.72%)
5 Years	rr_AverageAnnualReturnYear05	(8.45%)
10 Years	rr_AverageAnnualReturnYear10	2.11%
Inception Date	rr_AverageAnnualReturnInceptionDate	Sep. 29, 1995
Dreyfus International Value Fund (Prospectus Summary) | Dreyfus International Value Fund | Class A | After Taxes on Distributions and Sales
Risk Return [Abstract]	rr_RiskReturnAbstract
Label	rr_AverageAnnualReturnLabel	Class A returns after taxes on distributions and sale of fund shares
1 Year	rr_AverageAnnualReturnYear01	(13.96%)
5 Years	rr_AverageAnnualReturnYear05	(5.90%)
10 Years	rr_AverageAnnualReturnYear10	3.00%
Inception Date	rr_AverageAnnualReturnInceptionDate	Sep. 29, 1995
Dreyfus International Value Fund (Prospectus Summary) | Dreyfus International Value Fund | Class C
Risk Return [Abstract]	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	1.00%
Distribution (12b-1) fees	rr_DistributionAndService12b1FeesOverAssets	0.75%
Other expenses (including shareholder services fees)	rr_OtherExpensesOverAssets	0.63%
Total annual fund operating expenses	rr_ExpensesOverAssets	2.38%	[1]
Fee Waiver or Reimbursement over Assets, Date of Termination	rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination	2013-03-31
Expense Example, with Redemption, 1 Year	rr_ExpenseExampleYear01	341
Expense Example, with Redemption, 3 Years	rr_ExpenseExampleYear03	742
Expense Example, with Redemption, 5 Years	rr_ExpenseExampleYear05	1,270
Expense Example, with Redemption, 10 Years	rr_ExpenseExampleYear10	2,716
Expense Example, No Redemption, 1 Year	rr_ExpenseExampleNoRedemptionYear01	241
Expense Example, No Redemption, 3 Years	rr_ExpenseExampleNoRedemptionYear03	742
Expense Example, No Redemption, 5 Years	rr_ExpenseExampleNoRedemptionYear05	1,270
Expense Example, No Redemption, 10 Years	rr_ExpenseExampleNoRedemptionYear10	2,716
Label	rr_AverageAnnualReturnLabel	Class C returns before taxes
1 Year	rr_AverageAnnualReturnYear01	(19.33%)
5 Years	rr_AverageAnnualReturnYear05	(7.24%)
10 Years	rr_AverageAnnualReturnYear10	2.96%
Inception Date	rr_AverageAnnualReturnInceptionDate	Nov. 15, 2002
Dreyfus International Value Fund (Prospectus Summary) | Dreyfus International Value Fund | Class I
Risk Return [Abstract]	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	1.00%
Distribution (12b-1) fees	rr_DistributionAndService12b1FeesOverAssets	none
Other expenses (including shareholder services fees)	rr_OtherExpensesOverAssets	0.19%
Total annual fund operating expenses	rr_ExpensesOverAssets	1.19%	[1]
Fee Waiver or Reimbursement over Assets, Date of Termination	rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination	2013-03-31
Expense Example, with Redemption, 1 Year	rr_ExpenseExampleYear01	121
Expense Example, with Redemption, 3 Years	rr_ExpenseExampleYear03	378
Expense Example, with Redemption, 5 Years	rr_ExpenseExampleYear05	654
Expense Example, with Redemption, 10 Years	rr_ExpenseExampleYear10	1,443
Expense Example, No Redemption, 1 Year	rr_ExpenseExampleNoRedemptionYear01	121
Expense Example, No Redemption, 3 Years	rr_ExpenseExampleNoRedemptionYear03	378
Expense Example, No Redemption, 5 Years	rr_ExpenseExampleNoRedemptionYear05	654
Expense Example, No Redemption, 10 Years	rr_ExpenseExampleNoRedemptionYear10	1,443
Label	rr_AverageAnnualReturnLabel	Class I returns before taxes
1 Year	rr_AverageAnnualReturnYear01	(17.59%)
5 Years	rr_AverageAnnualReturnYear05	(6.08%)
10 Years	rr_AverageAnnualReturnYear10	4.04%
Inception Date	rr_AverageAnnualReturnInceptionDate	Nov. 15, 2002

[1] The Dreyfus Corporation has agreed to waive receipt of a portion of the fund's management fee in the amount of .10% of the value of the fund's average daily total assets until March 31, 2013. On or after March 31, 2013, The Dreyfus Corporation may terminate this expense waiver at any time.

XML

Label	Element	Value
Risk Return [Abstract]	rr_RiskReturnAbstract
ProspectusDate	rr_ProspectusDate	Jan. 01, 2013
Dreyfus Opportunistic U.S. Stock Fund (Prospectus Summary) | Dreyfus Opportunistic U.S. Stock Fund
Risk Return [Abstract]	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 on page 8 of the Prospectus and in the How to Buy Shares section and the Additional Information About How to Buy Shares section on page II-1 and page III-1, respectively, of the fund's Statement of Additional Information. 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.
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 46.51% of the average value of its portfolio.
Portfolio Turnover, Rate	rr_PortfolioTurnoverRate	46.51%
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:
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 stocks of publicly traded companies located in the United States. The fund may invest in the stocks of companies of any market capitalization and may hold growth or value stocks or a blend of both. The fund's portfolio construction combines a fundamental, bottom-up research process with macro insights and risk management. The fund's portfolio managers, supported by a team of research analysts, use a disciplined opportunistic investment approach to identify stocks of companies that the portfolio managers believe are trading materially below their intrinsic market value, have strong or improving fundamentals and have a revaluation catalyst. The fund seeks exposure to stocks and sectors that the fund's portfolio managers perceive to be attractive from a valuation and fundamental standpoint. Portfolio position sizes and sector weightings reflect the collaborative investment process among the fund's portfolio managers and research analysts. The portfolio managers also assess and manage the overall risk profile of the fund's portfolio.
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. o 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. o 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. o 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 typically lack the dividend yield that can 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. o 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. o Liquidity risk. When there is little or no active trading market for a security, the fund may not be able to sell the security in a timely manner at its perceived value, which could cause the fund's share price to fall.
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	Since the fund has less than one full calendar year of performance, past performance information is not included in the summary prospectus. Annual performance returns provide some indication of the risks of investing in the fund by showing changes in performance from year to year. Comparison of fund performance to an appropriate index indicates how the fund's average annual returns compare with 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. Recent performance is available at www.dreyfus.com.
Performance One Year or Less [Text]	rr_PerformanceOneYearOrLess	Since the fund has less than one full calendar year of performance, past performance information is not included in the summary prospectus.
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.
Dreyfus Opportunistic U.S. Stock Fund (Prospectus Summary) | Dreyfus Opportunistic U.S. Stock Fund | Class A
Risk Return [Abstract]	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
Management fees	rr_ManagementFeesOverAssets	0.75%
Distribution (Rule 12b-1) fees	rr_DistributionAndService12b1FeesOverAssets	none
Other expenses (including shareholder services fees)	rr_OtherExpensesOverAssets	6.76%
Total annual fund operating expenses	rr_ExpensesOverAssets	7.51%	[1]
Fee waiver and/or expense reimbursement	rr_FeeWaiverOrReimbursementOverAssets	(6.31%)
Total annual fund operating expenses (less fee waiver and/or expense reimbursement)	rr_NetExpensesOverAssets	1.20%
Fee Waiver or Reimbursement over Assets, Date of Termination	rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination	2014-02-01
Expense Example, with Redemption, 1 Year	rr_ExpenseExampleYear01	690
Expense Example, with Redemption, 3 Years	rr_ExpenseExampleYear03	2,123
Expense Example, with Redemption, 5 Years	rr_ExpenseExampleYear05	3,485
Expense Example, with Redemption, 10 Years	rr_ExpenseExampleYear10	6,601
Expense Example, No Redemption, 1 Year	rr_ExpenseExampleNoRedemptionYear01	690
Expense Example, No Redemption, 3 Years	rr_ExpenseExampleNoRedemptionYear03	2,123
Expense Example, No Redemption, 5 Years	rr_ExpenseExampleNoRedemptionYear05	3,485
Expense Example, No Redemption, 10 Years	rr_ExpenseExampleNoRedemptionYear10	6,601
Dreyfus Opportunistic U.S. Stock Fund (Prospectus Summary) | Dreyfus Opportunistic U.S. Stock Fund | Class C
Risk Return [Abstract]	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 (Rule 12b-1) fees	rr_DistributionAndService12b1FeesOverAssets	0.75%
Other expenses (including shareholder services fees)	rr_OtherExpensesOverAssets	6.59%
Total annual fund operating expenses	rr_ExpensesOverAssets	8.09%	[1]
Fee waiver and/or expense reimbursement	rr_FeeWaiverOrReimbursementOverAssets	(6.14%)
Total annual fund operating expenses (less fee waiver and/or expense reimbursement)	rr_NetExpensesOverAssets	1.95%
Fee Waiver or Reimbursement over Assets, Date of Termination	rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination	2014-02-01
Expense Example, with Redemption, 1 Year	rr_ExpenseExampleYear01	298
Expense Example, with Redemption, 3 Years	rr_ExpenseExampleYear03	1,814
Expense Example, with Redemption, 5 Years	rr_ExpenseExampleYear05	3,332
Expense Example, with Redemption, 10 Years	rr_ExpenseExampleYear10	6,735
Expense Example, No Redemption, 1 Year	rr_ExpenseExampleNoRedemptionYear01	198
Expense Example, No Redemption, 3 Years	rr_ExpenseExampleNoRedemptionYear03	1,814
Expense Example, No Redemption, 5 Years	rr_ExpenseExampleNoRedemptionYear05	3,332
Expense Example, No Redemption, 10 Years	rr_ExpenseExampleNoRedemptionYear10	6,735
Dreyfus Opportunistic U.S. Stock Fund (Prospectus Summary) | Dreyfus Opportunistic U.S. Stock Fund | Class I
Risk Return [Abstract]	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 (Rule 12b-1) fees	rr_DistributionAndService12b1FeesOverAssets	none
Other expenses (including shareholder services fees)	rr_OtherExpensesOverAssets	6.38%
Total annual fund operating expenses	rr_ExpensesOverAssets	7.13%	[1]
Fee waiver and/or expense reimbursement	rr_FeeWaiverOrReimbursementOverAssets	(6.18%)
Total annual fund operating expenses (less fee waiver and/or expense reimbursement)	rr_NetExpensesOverAssets	0.95%
Fee Waiver or Reimbursement over Assets, Date of Termination	rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination	2014-02-01
Expense Example, with Redemption, 1 Year	rr_ExpenseExampleYear01	97
Expense Example, with Redemption, 3 Years	rr_ExpenseExampleYear03	1,549
Expense Example, with Redemption, 5 Years	rr_ExpenseExampleYear05	2,940
Expense Example, with Redemption, 10 Years	rr_ExpenseExampleYear10	6,167
Expense Example, No Redemption, 1 Year	rr_ExpenseExampleNoRedemptionYear01	97
Expense Example, No Redemption, 3 Years	rr_ExpenseExampleNoRedemptionYear03	1,549
Expense Example, No Redemption, 5 Years	rr_ExpenseExampleNoRedemptionYear05	2,940
Expense Example, No Redemption, 10 Years	rr_ExpenseExampleNoRedemptionYear10	6,167

[1] The Dreyfus Corporation has contractually agreed, until February 1, 2014, 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 and distribution plan fees, shareholder services plan fees, taxes, interest expense, brokerage commissions, commitment fees on borrowings and extraordinary expenses) exceed 0.95%. On or after February 1, 2014, The Dreyfus Corporation may terminate this expense waiver at any time.

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Dreyfus Strategic Value Fund (Prospectus Summary) | Dreyfus Strategic Value Fund

Fund Summary

Investment Objective

The fund seeks capital appreciation.

Fees and Expenses

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 on page 7 of the Prospectus and in the How to Buy Shares section
and the Additional Information About How to Buy Shares section on page II-1 and
page III-1, respectively, of the fund's Statement of Additional Information.
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.

Shareholder Fees (fees paid directly from your investment)

Shareholder Fees Dreyfus Strategic Value Fund	Class A	Class C	Class I
Maximum sales charge (load) imposed on purchases (as a percentage of offering price)	5.75%	none	none
Maximum deferred sales charge (load) (as a percentage of lower of purchase or sale price)	none	1.00%	none

Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)

Annual Fund Operating Expenses Dreyfus Strategic Value Fund		Class A	Class C	Class I
Management fees		0.75%	0.75%	0.75%
Distribution (12b-1) fees		none	0.75%	none
Other expenses (including shareholder services fees)		0.45%	0.47%	0.22%
Total annual fund operating expenses	[1]	1.20%	1.97%	0.97%
Fee waiver and/or expense reimbursement		(0.22%)	(0.24%)	(0.24%)
Total annual fund operating expenses (after fee waiver and/or expense reimbursement)		0.98%	1.73%	0.73%

Example

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:

Expense Example Dreyfus Strategic Value Fund (USD $)	Expense Example, with Redemption, 1 Year	Expense Example, with Redemption, 3 Years	Expense Example, with Redemption, 5 Years	Expense Example, with Redemption, 10 Years
Class A	669	914	1,177	1,928
Class C	276	595	1,040	2,276
Class I	75	285	513	1,168

You would pay the following expenses if you did not redeem your shares:

Expense Example, No Redemption Dreyfus Strategic Value Fund (USD $)	Expense Example, No Redemption, 1 Year	Expense Example, No Redemption, 3 Years	Expense Example, No Redemption, 5 Years	Expense Example, No Redemption, 10 Years
Class A	669	914	1,177	1,928
Class C	176	595	1,040	2,276
Class I	75	285	513	1,168

Portfolio Turnover

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
95.38% of the average value of its portfolio.

Principal Investment Strategy

To pursue its goal, the fund normally invests at least 80% of its net assets,
plus any borrowings for investment purposes, in stocks. The fund's portfolio
managers identify potential investments through extensive quantitative and
fundamental research. The fund may invest up to 30% of its assets in foreign
securities. The fund will focus on individual stock selection (a "bottom-up"
approach), emphasizing three key factors: value, sound business fundamentals
and positive business momentum.

Principal Risks

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.

o 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.

o 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.

o 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.

o Foreign investment risk. 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.

Performance

The following bar chart and table provide some indication of the risks of
investing in the fund. 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.

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.

Year-by-Year Total Returns as of 12/31 each year (%) -- Class A

Best Quarter
Q2, 2003: 19.26%
Worst Quarter
Q3, 2002: -23.95%

The year-to-date total return of the fund's Class A shares as
of 9/30/12 was 13.99%.

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 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.

Average Annual Total Returns (as of 12/31/11)

Average Annual Total Returns Dreyfus Strategic Value Fund	Label	1 Year	5 Years	10 Years
Class A	Class A returns before taxes	(11.63%)	(2.98%)	3.27%
Class A After Taxes on Distributions	Class A returns after taxes on distributions	(11.73%)	(3.30%)	2.80%
Class A After Taxes on Distributions and Sales	Class A returns after taxes on distributions and sale of fund shares	(7.43%)	(2.53%)	2.73%
Class C	Class C returns before taxes	(7.85%)	(2.55%)	3.15%
Class I	Class I returns before taxes	(6.00%)	(1.63%)	4.11%
Russell 1000 Value Index	Russell 1000 Value Index reflects no deduction for fees, expenses or taxes	0.39%	(2.64%)	3.89%

[1] The Dreyfus Corporation has contractually agreed to waive receipt of its fees and/or assume the expenses of the fund until at least December 31, 2013, so that the total annual fund operating expenses of Class A, Class C, and Class I shares (excluding taxes, interest, brokerage commissions, commitment fees on borrowings and extraordinary expenses) do not exceed .98%, 1.73%, and .73%, respectively. On or after December 31, 2013, The Dreyfus Corporation may terminate this expense waiver at any time.

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Label	Element	Value
Risk Return [Abstract]	rr_RiskReturnAbstract
ProspectusDate	rr_ProspectusDate	Jan. 01, 2013
Dreyfus Technology Growth Fund (Prospectus Summary) | Dreyfus Technology Growth Fund
Risk Return [Abstract]	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 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 on page 9 of the Prospectus and in the How to Buy Shares section and the Additional Information About How to Buy Shares section on page II-1 and page III-1, respectively, of the fund's Statement of Additional Information. 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.
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 69.20% of the average value of its portfolio.
Portfolio Turnover, Rate	rr_PortfolioTurnoverRate	69.20%
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 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.
Strategy Portfolio Concentration [Text]	rr_StrategyPortfolioConcentration	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.
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. o 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. o 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. o 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. o 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. o Foreign investment risk. 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. o Liquidity risk. When there is little or no active trading market for a security, the fund may not be able to sell the security in a timely manner at its perceived value, which could cause the fund's share price to fall.
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 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 Narrative [Text Block]	rr_BarChartNarrativeTextBlock	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.
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: 25.35% Worst Quarter Q3, 2002: -26.74% The year-to-date total return of the fund's Class A shares as of 9/30/12 was 16.65%.
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 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 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.
Caption	rr_AverageAnnualReturnCaption	Average Annual Total Returns (as of 12/31/11)
Dreyfus Technology Growth Fund (Prospectus Summary) | Dreyfus Technology Growth Fund | Morgan Stanley High Technology 35 Index
Risk Return [Abstract]	rr_RiskReturnAbstract
Label	rr_AverageAnnualReturnLabel	Morgan Stanley High Technology 35 Index reflects no deduction for fees, expenses or taxes
1 Year	rr_AverageAnnualReturnYear01	(10.28%)
5 Years	rr_AverageAnnualReturnYear05	1.64%
10 Years	rr_AverageAnnualReturnYear10	2.17%
Dreyfus Technology Growth Fund (Prospectus Summary) | Dreyfus Technology Growth Fund | Standard & Poor's 500 Composite Stock Price Index
Risk Return [Abstract]	rr_RiskReturnAbstract
Label	rr_AverageAnnualReturnLabel	Standard & Poor's 500 Composite Stock Price Index reflects no deduction for fees, expenses or taxes
1 Year	rr_AverageAnnualReturnYear01	2.09%
5 Years	rr_AverageAnnualReturnYear05	(0.25%)
10 Years	rr_AverageAnnualReturnYear10	2.92%
Dreyfus Technology Growth Fund (Prospectus Summary) | Dreyfus Technology Growth Fund | Class A
Risk Return [Abstract]	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
Management fees	rr_ManagementFeesOverAssets	0.75%
Distribution (12b-1) fees	rr_DistributionAndService12b1FeesOverAssets	none
Other expenses (including shareholder services fees)	rr_OtherExpensesOverAssets	0.70%
Total annual fund operating expenses	rr_ExpensesOverAssets	1.45%
Expense Example, with Redemption, 1 Year	rr_ExpenseExampleYear01	714
Expense Example, with Redemption, 3 Years	rr_ExpenseExampleYear03	1,007
Expense Example, with Redemption, 5 Years	rr_ExpenseExampleYear05	1,322
Expense Example, with Redemption, 10 Years	rr_ExpenseExampleYear10	2,210
Expense Example, No Redemption, 1 Year	rr_ExpenseExampleNoRedemptionYear01	714
Expense Example, No Redemption, 3 Years	rr_ExpenseExampleNoRedemptionYear03	1,007
Expense Example, No Redemption, 5 Years	rr_ExpenseExampleNoRedemptionYear05	1,322
Expense Example, No Redemption, 10 Years	rr_ExpenseExampleNoRedemptionYear10	2,210
Annual Return 2002	rr_AnnualReturn2002	(39.78%)
Annual Return 2003	rr_AnnualReturn2003	52.22%
Annual Return 2004	rr_AnnualReturn2004	0.31%
Annual Return 2005	rr_AnnualReturn2005	3.82%
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%)
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	Sep. 30, 2012
Bar Chart, Year to Date Return	rr_BarChartYearToDateReturn	16.65%
Highest Quarterly Return, Label	rr_HighestQuarterlyReturnLabel	Best Quarter
Highest Quarterly Return, Date	rr_BarChartHighestQuarterlyReturnDate	Jun. 30, 2003
Highest Quarterly Return	rr_BarChartHighestQuarterlyReturn	25.35%
Lowest Quarterly Return, Label	rr_LowestQuarterlyReturnLabel	Worst Quarter
Lowest Quarterly Return, Date	rr_BarChartLowestQuarterlyReturnDate	Sep. 30, 2002
Lowest Quarterly Return	rr_BarChartLowestQuarterlyReturn	(26.74%)
Label	rr_AverageAnnualReturnLabel	Class A returns before taxes
1 Year	rr_AverageAnnualReturnYear01	(13.37%)
5 Years	rr_AverageAnnualReturnYear05	2.59%
10 Years	rr_AverageAnnualReturnYear10	1.17%
Dreyfus Technology Growth Fund (Prospectus Summary) | Dreyfus Technology Growth Fund | Class A | After Taxes on Distributions
Risk Return [Abstract]	rr_RiskReturnAbstract
Label	rr_AverageAnnualReturnLabel	Class A returns after taxes on distributions
1 Year	rr_AverageAnnualReturnYear01	(13.37%)
5 Years	rr_AverageAnnualReturnYear05	2.59%
10 Years	rr_AverageAnnualReturnYear10	1.17%
Dreyfus Technology Growth Fund (Prospectus Summary) | Dreyfus Technology Growth Fund | Class A | After Taxes on Distributions and Sales
Risk Return [Abstract]	rr_RiskReturnAbstract
Label	rr_AverageAnnualReturnLabel	Class A returns after taxes on distributions and sale of fund shares
1 Year	rr_AverageAnnualReturnYear01	(8.69%)
5 Years	rr_AverageAnnualReturnYear05	2.22%
10 Years	rr_AverageAnnualReturnYear10	1.00%
Dreyfus Technology Growth Fund (Prospectus Summary) | Dreyfus Technology Growth Fund | Class C
Risk Return [Abstract]	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	0.77%
Total annual fund operating expenses	rr_ExpensesOverAssets	2.27%
Expense Example, with Redemption, 1 Year	rr_ExpenseExampleYear01	330
Expense Example, with Redemption, 3 Years	rr_ExpenseExampleYear03	709
Expense Example, with Redemption, 5 Years	rr_ExpenseExampleYear05	1,215
Expense Example, with Redemption, 10 Years	rr_ExpenseExampleYear10	2,605
Expense Example, No Redemption, 1 Year	rr_ExpenseExampleNoRedemptionYear01	230
Expense Example, No Redemption, 3 Years	rr_ExpenseExampleNoRedemptionYear03	709
Expense Example, No Redemption, 5 Years	rr_ExpenseExampleNoRedemptionYear05	1,215
Expense Example, No Redemption, 10 Years	rr_ExpenseExampleNoRedemptionYear10	2,605
Label	rr_AverageAnnualReturnLabel	Class C returns before taxes
1 Year	rr_AverageAnnualReturnYear01	(9.74%)
5 Years	rr_AverageAnnualReturnYear05	2.87%
10 Years	rr_AverageAnnualReturnYear10	0.84%
Dreyfus Technology Growth Fund (Prospectus Summary) | Dreyfus Technology Growth Fund | Class I
Risk Return [Abstract]	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	0.33%
Total annual fund operating expenses	rr_ExpensesOverAssets	1.08%
Expense Example, with Redemption, 1 Year	rr_ExpenseExampleYear01	110
Expense Example, with Redemption, 3 Years	rr_ExpenseExampleYear03	343
Expense Example, with Redemption, 5 Years	rr_ExpenseExampleYear05	595
Expense Example, with Redemption, 10 Years	rr_ExpenseExampleYear10	1,317
Expense Example, No Redemption, 1 Year	rr_ExpenseExampleNoRedemptionYear01	110
Expense Example, No Redemption, 3 Years	rr_ExpenseExampleNoRedemptionYear03	343
Expense Example, No Redemption, 5 Years	rr_ExpenseExampleNoRedemptionYear05	595
Expense Example, No Redemption, 10 Years	rr_ExpenseExampleNoRedemptionYear10	1,317
Label	rr_AverageAnnualReturnLabel	Class I returns before taxes
1 Year	rr_AverageAnnualReturnYear01	(7.73%)
5 Years	rr_AverageAnnualReturnYear05	4.22%
10 Years	rr_AverageAnnualReturnYear10	2.20%

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Dreyfus International Value Fund (Prospectus Summary) | Dreyfus International Value Fund

Fund Summary

Investment Objective

The fund seeks long-term capital growth.

Fees and Expenses

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 on page 8 of the Prospectus and in the How to Buy Shares section
and the Additional Information About How to Buy Shares section on page II-1 and
page III-1, respectively, of the fund's Statement of Additional Information.
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.

Shareholder Fees (fees paid directly from your investment)

Shareholder Fees Dreyfus International Value Fund	Class A	Class C	Class I
Maximum sales charge (load) imposed on purchases (as a percentage of offering price)	5.75%	none	none
Maximum deferred sales charge (load) (as a percentage of lower of purchase or sale price)	none	1.00%	none

Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)

Annual Fund Operating Expenses Dreyfus International Value Fund		Class A	Class C	Class I
Management fees		1.00%	1.00%	1.00%
Distribution (12b-1) fees		none	0.75%	none
Other expenses (including shareholder services fees)		0.63%	0.63%	0.19%
Total annual fund operating expenses	[1]	1.63%	2.38%	1.19%

Example

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 Dreyfus International Value Fund (USD $)	Expense Example, with Redemption, 1 Year	Expense Example, with Redemption, 3 Years	Expense Example, with Redemption, 5 Years	Expense Example, with Redemption, 10 Years
Class A	731	1,060	1,411	2,397
Class C	341	742	1,270	2,716
Class I	121	378	654	1,443

You would pay the following expenses if you did not redeem your shares:

Expense Example, No Redemption Dreyfus International Value Fund (USD $)	Expense Example, No Redemption, 1 Year	Expense Example, No Redemption, 3 Years	Expense Example, No Redemption, 5 Years	Expense Example, No Redemption, 10 Years
Class A	731	1,060	1,411	2,397
Class C	241	742	1,270	2,716
Class I	121	378	654	1,443

Portfolio Turnover

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 40.93% of the average value of its
portfolio.

Principal Investment Strategy

To pursue its goal, the fund normally invests at least 80% of its net assets,
plus any borrowings for investment purposes, in stocks. The fund ordinarily
invests most of its assets in securities of foreign companies that The Dreyfus
Corporation considers to be value companies. In selecting stocks, the fund's
portfolio managers identify potential investments through extensive quantitative
and fundamental research. Emphasizing individual stock selection rather than
economic and industry trends, the fund focuses on three key factors: value,
business health and business momentum.

Principal Risks

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.

o Foreign investment risk. The fund's performance may 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.

o Foreign currency risk. Investments in foreign currencies are subject to the
risk that those currencies will decline in value relative to the U.S. dollar or,
in the case of hedged positions, that the U.S. dollar will decline relative to
the currency being hedged. Currency exchange rates may fluctuate significantly
over short periods of time. Foreign currencies are also subject to risks caused
by inflation, interest rates, budget deficits and low savings rates, political
factors and government intervention and controls.

o 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.

o 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.

o Liquidity risk. When there is little or no active trading market for a
security, the fund may not be able to sell the security in a timely manner at
its perceived value, which could cause the fund's share price to fall.
Investments in foreign securities tend to have greater exposure to liquidity
risk than domestic securities.

Performance

The following bar chart and table provide some indication of the risks of
investing in the fund. 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.

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.

Year-by-Year Total Returns as of 12/31 each year (%) -- Class A

Best Quarter
Q2, 2009: 24.48%
Worst Quarter
Q3, 2011: -21.42%

The year-to-date total return of the fund's Class A shares as
of 9/30/12 was 6.59%.

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 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 November 15, 2002 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.

Average Annual Total Returns (as of 12/31/11)

Average Annual Total Returns Dreyfus International Value Fund	Label	1 Year	5 Years	10 Years	Inception Date
Class A	Class A returns before taxes	(22.65%)	(7.61%)	3.05%	Sep. 29, 1995
Class A After Taxes on Distributions	Class A returns after taxes on distributions	(22.72%)	(8.45%)	2.11%	Sep. 29, 1995
Class A After Taxes on Distributions and Sales	Class A returns after taxes on distributions and sale of fund shares	(13.96%)	(5.90%)	3.00%	Sep. 29, 1995
Class C	Class C returns before taxes	(19.33%)	(7.24%)	2.96%	Nov. 15, 2002
Class I	Class I returns before taxes	(17.59%)	(6.08%)	4.04%	Nov. 15, 2002
MSCI Europe, Australasia, Far East (EAFE) Index (ND)	MSCI Europe, Australasia, Far East (EAFE) Index (ND) reflects no deduction for fees, expenses or taxes	(12.14%)	4.72%	4.67%

[1] The Dreyfus Corporation has agreed to waive receipt of a portion of the fund's management fee in the amount of .10% of the value of the fund's average daily total assets until March 31, 2013. On or after March 31, 2013, The Dreyfus Corporation may terminate this expense waiver at any time.

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Label	Element	Value
Risk Return [Abstract]	rr_RiskReturnAbstract
ProspectusDate	rr_ProspectusDate	Jan. 01, 2013
Dreyfus Structured Midcap Fund (Prospectus Summary) | Dreyfus Structured Midcap Fund
Risk Return [Abstract]	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.
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 on page 9 of the Prospectus and in the How to Buy Shares section and the Additional Information About How to Buy Shares section on page II-1 and page III-1, respectively, of the fund's Statement of Additional Information. 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.
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 93.44% of the average value of its portfolio.
Portfolio Turnover, Rate	rr_PortfolioTurnoverRate	93.44%
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:
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 companies included in the S&P® Midcap 400 Index or the Russell Midcap® Index at the time of purchase. The fund's portfolio managers select stocks through a "bottom-up," structured approach that seeks to identify undervalued securities using a quantitative screening process. This process is driven by a proprietary quantitative model that measures a diverse set of characteristics of stocks to identify and rank stocks based on valuation, momentum/sentiment, and earnings quality. Next, the fund's portfolio managers construct the portfolio through a risk controlled process, focusing on stock selection as opposed to making proactive decisions as to industry and sector exposure. The fund seeks to maintain a portfolio that has exposure to industries and market capitalizations that are generally similar to those of the S&P Midcap 400 Index. Finally, within each sector and style subset, the fund will seek to overweight the most attractive stocks and underweight or not hold the stocks that have been ranked least attractive.
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. o 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. o 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. o 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 typically lack the dividend yield that can 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. o Liquidity risk. When there is little or no active trading market for a security, the fund may not be able to sell the security in a timely manner at its perceived value, which could cause the fund's share price to fall.
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 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 Narrative [Text Block]	rr_BarChartNarrativeTextBlock	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.
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: 17.90% Worst Quarter Q4, 2008: -27.25% The year-to-date total return of the fund's Class A shares as of 9/30/12 was 14.48%.
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 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 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.
Caption	rr_AverageAnnualReturnCaption	Average Annual Total Returns (as of 12/31/11)
Dreyfus Structured Midcap Fund (Prospectus Summary) | Dreyfus Structured Midcap Fund | Russell Midcap Index
Risk Return [Abstract]	rr_RiskReturnAbstract
Label	rr_AverageAnnualReturnLabel	Russell Midcap Index reflects no deduction for fees, expenses or taxes
1 Year	rr_AverageAnnualReturnYear01	(1.55%)
5 Years	rr_AverageAnnualReturnYear05	1.41%
10 Years	rr_AverageAnnualReturnYear10	6.99%
Dreyfus Structured Midcap Fund (Prospectus Summary) | Dreyfus Structured Midcap Fund | S&P Midcap 400 Index
Risk Return [Abstract]	rr_RiskReturnAbstract
Label	rr_AverageAnnualReturnLabel	S&P Midcap 400 Index reflects no deduction for fees, expenses or taxes
1 Year	rr_AverageAnnualReturnYear01	(1.73%)
5 Years	rr_AverageAnnualReturnYear05	3.32%
10 Years	rr_AverageAnnualReturnYear10	7.04%
Dreyfus Structured Midcap Fund (Prospectus Summary) | Dreyfus Structured Midcap Fund | Class A
Risk Return [Abstract]	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
Management fees	rr_ManagementFeesOverAssets	0.75%
Distribution (12b-1) fees	rr_DistributionAndService12b1FeesOverAssets	none
Other expenses (including shareholder services fees)	rr_OtherExpensesOverAssets	0.66%
Total annual fund operating expenses	rr_ExpensesOverAssets	1.41%	[1]
Fee waiver and/or expense reimbursement	rr_FeeWaiverOrReimbursementOverAssets	(0.16%)
Total annual fund operating expenses (less fee waiver and/or expense reimbursement)	rr_NetExpensesOverAssets	1.25%
Fee Waiver or Reimbursement over Assets, Date of Termination	rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination	2014-01-01
Expense Example, with Redemption, 1 Year	rr_ExpenseExampleYear01	695
Expense Example, with Redemption, 3 Years	rr_ExpenseExampleYear03	981
Expense Example, with Redemption, 5 Years	rr_ExpenseExampleYear05	1,287
Expense Example, with Redemption, 10 Years	rr_ExpenseExampleYear10	2,156
Expense Example, No Redemption, 1 Year	rr_ExpenseExampleNoRedemptionYear01	695
Expense Example, No Redemption, 3 Years	rr_ExpenseExampleNoRedemptionYear03	981
Expense Example, No Redemption, 5 Years	rr_ExpenseExampleNoRedemptionYear05	1,287
Expense Example, No Redemption, 10 Years	rr_ExpenseExampleNoRedemptionYear10	2,156
Annual Return 2002	rr_AnnualReturn2002	(10.74%)
Annual Return 2003	rr_AnnualReturn2003	34.02%
Annual Return 2004	rr_AnnualReturn2004	19.31%
Annual Return 2005	rr_AnnualReturn2005	10.03%
Annual Return 2006	rr_AnnualReturn2006	13.00%
Annual Return 2007	rr_AnnualReturn2007	2.58%
Annual Return 2008	rr_AnnualReturn2008	(40.57%)
Annual Return 2009	rr_AnnualReturn2009	35.17%
Annual Return 2010	rr_AnnualReturn2010	26.50%
Annual Return 2011	rr_AnnualReturn2011	(0.05%)
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	Sep. 30, 2012
Bar Chart, Year to Date Return	rr_BarChartYearToDateReturn	14.48%
Highest Quarterly Return, Label	rr_HighestQuarterlyReturnLabel	Best Quarter
Highest Quarterly Return, Date	rr_BarChartHighestQuarterlyReturnDate	Sep. 30, 2009
Highest Quarterly Return	rr_BarChartHighestQuarterlyReturn	17.90%
Lowest Quarterly Return, Label	rr_LowestQuarterlyReturnLabel	Worst Quarter
Lowest Quarterly Return, Date	rr_BarChartLowestQuarterlyReturnDate	Dec. 31, 2008
Lowest Quarterly Return	rr_BarChartLowestQuarterlyReturn	(27.25%)
Label	rr_AverageAnnualReturnLabel	Class A returns before taxes
1 Year	rr_AverageAnnualReturnYear01	(5.81%)
5 Years	rr_AverageAnnualReturnYear05	(0.36%)
10 Years	rr_AverageAnnualReturnYear10	5.72%
Dreyfus Structured Midcap Fund (Prospectus Summary) | Dreyfus Structured Midcap Fund | Class A | After Taxes on Distributions
Risk Return [Abstract]	rr_RiskReturnAbstract
Label	rr_AverageAnnualReturnLabel	Class A returns after taxes on distributions
1 Year	rr_AverageAnnualReturnYear01	(5.81%)
5 Years	rr_AverageAnnualReturnYear05	(0.68%)
10 Years	rr_AverageAnnualReturnYear10	5.40%
Dreyfus Structured Midcap Fund (Prospectus Summary) | Dreyfus Structured Midcap Fund | Class A | After Taxes on Distributions and Sales
Risk Return [Abstract]	rr_RiskReturnAbstract
Label	rr_AverageAnnualReturnLabel	Class A returns after taxes on distributions and sale of fund shares
1 Year	rr_AverageAnnualReturnYear01	(3.78%)
5 Years	rr_AverageAnnualReturnYear05	(0.42%)
10 Years	rr_AverageAnnualReturnYear10	4.92%
Dreyfus Structured Midcap Fund (Prospectus Summary) | Dreyfus Structured Midcap Fund | Class C
Risk Return [Abstract]	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	0.64%
Total annual fund operating expenses	rr_ExpensesOverAssets	2.14%	[1]
Fee waiver and/or expense reimbursement	rr_FeeWaiverOrReimbursementOverAssets	(0.14%)
Total annual fund operating expenses (less fee waiver and/or expense reimbursement)	rr_NetExpensesOverAssets	2.00%
Fee Waiver or Reimbursement over Assets, Date of Termination	rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination	2014-01-01
Expense Example, with Redemption, 1 Year	rr_ExpenseExampleYear01	303
Expense Example, with Redemption, 3 Years	rr_ExpenseExampleYear03	657
Expense Example, with Redemption, 5 Years	rr_ExpenseExampleYear05	1,136
Expense Example, with Redemption, 10 Years	rr_ExpenseExampleYear10	2,461
Expense Example, No Redemption, 1 Year	rr_ExpenseExampleNoRedemptionYear01	203
Expense Example, No Redemption, 3 Years	rr_ExpenseExampleNoRedemptionYear03	657
Expense Example, No Redemption, 5 Years	rr_ExpenseExampleNoRedemptionYear05	1,136
Expense Example, No Redemption, 10 Years	rr_ExpenseExampleNoRedemptionYear10	2,461
Label	rr_AverageAnnualReturnLabel	Class C returns before taxes
1 Year	rr_AverageAnnualReturnYear01	(1.72%)
5 Years	rr_AverageAnnualReturnYear05	0.09%
10 Years	rr_AverageAnnualReturnYear10	5.54%
Dreyfus Structured Midcap Fund (Prospectus Summary) | Dreyfus Structured Midcap Fund | Class I
Risk Return [Abstract]	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	0.47%
Total annual fund operating expenses	rr_ExpensesOverAssets	1.22%	[1]
Fee waiver and/or expense reimbursement	rr_FeeWaiverOrReimbursementOverAssets	(0.22%)
Total annual fund operating expenses (less fee waiver and/or expense reimbursement)	rr_NetExpensesOverAssets	1.00%
Fee Waiver or Reimbursement over Assets, Date of Termination	rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination	2014-01-01
Expense Example, with Redemption, 1 Year	rr_ExpenseExampleYear01	102
Expense Example, with Redemption, 3 Years	rr_ExpenseExampleYear03	365
Expense Example, with Redemption, 5 Years	rr_ExpenseExampleYear05	649
Expense Example, with Redemption, 10 Years	rr_ExpenseExampleYear10	1,458
Expense Example, No Redemption, 1 Year	rr_ExpenseExampleNoRedemptionYear01	102
Expense Example, No Redemption, 3 Years	rr_ExpenseExampleNoRedemptionYear03	365
Expense Example, No Redemption, 5 Years	rr_ExpenseExampleNoRedemptionYear05	649
Expense Example, No Redemption, 10 Years	rr_ExpenseExampleNoRedemptionYear10	1,458
Label	rr_AverageAnnualReturnLabel	Class I returns before taxes
1 Year	rr_AverageAnnualReturnYear01	0.08%
5 Years	rr_AverageAnnualReturnYear05	1.05%
10 Years	rr_AverageAnnualReturnYear10	6.56%

[1] The Dreyfus Corporation has contractually agreed, until January 1, 2014, 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 distribution fees, shareholder services plan fees, taxes, interest expense, brokerage commissions and extraordinary expenses) exceed 1.00%. On or after January 1, 2014, The Dreyfus Corporation may terminate this expense waiver at any time.

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Dreyfus Opportunistic U.S. Stock Fund (Prospectus Summary) | Dreyfus Opportunistic U.S. Stock Fund

Fund Summary

Investment Objective

The fund seeks long-term capital appreciation.

Fees and Expenses

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 on page 8 of the Prospectus and in the How to Buy Shares section
and the Additional Information About How to Buy Shares section on page II-1 and
page III-1, respectively, of the fund's Statement of Additional Information.
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.

Shareholder Fees (fees paid directly from your investment)

Shareholder Fees Dreyfus Opportunistic U.S. Stock Fund	Class A	Class C	Class I
Maximum sales charge (load) imposed on purchases (as a percentage of offering price)	5.75%	none	none
Maximum deferred sales charge (load) (as a percentage of lower of purchase or sale price)	none	1.00%	none

Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)

Annual Fund Operating Expenses Dreyfus Opportunistic U.S. Stock Fund		Class A	Class C	Class I
Management fees		0.75%	0.75%	0.75%
Distribution (Rule 12b-1) fees		none	0.75%	none
Other expenses (including shareholder services fees)		6.76%	6.59%	6.38%
Total annual fund operating expenses	[1]	7.51%	8.09%	7.13%
Fee waiver and/or expense reimbursement		(6.31%)	(6.14%)	(6.18%)
Total annual fund operating expenses (less fee waiver and/or expense reimbursement)		1.20%	1.95%	0.95%

Example

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:

Expense Example Dreyfus Opportunistic U.S. Stock Fund (USD $)	Expense Example, with Redemption, 1 Year	Expense Example, with Redemption, 3 Years	Expense Example, with Redemption, 5 Years	Expense Example, with Redemption, 10 Years
Class A	690	2,123	3,485	6,601
Class C	298	1,814	3,332	6,735
Class I	97	1,549	2,940	6,167

You would pay the following expenses if you did not redeem your shares:

Expense Example, No Redemption Dreyfus Opportunistic U.S. Stock Fund (USD $)	Expense Example, No Redemption, 1 Year	Expense Example, No Redemption, 3 Years	Expense Example, No Redemption, 5 Years	Expense Example, No Redemption, 10 Years
Class A	690	2,123	3,485	6,601
Class C	198	1,814	3,332	6,735
Class I	97	1,549	2,940	6,167

Portfolio Turnover

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
46.51% of the average value of its portfolio.

Principal Investment Strategy

To pursue its goal, the fund normally invests at least 80% of its net assets,
plus any borrowings for investment purposes, in stocks of publicly traded
companies located in the United States. The fund may invest in the stocks of
companies of any market capitalization and may hold growth or value stocks or
a blend of both. The fund's portfolio construction combines a fundamental,
bottom-up research process with macro insights and risk management. The fund's
portfolio managers, supported by a team of research analysts, use a disciplined
opportunistic investment approach to identify stocks of companies that the
portfolio managers believe are trading materially below their intrinsic market
value, have strong or improving fundamentals and have a revaluation catalyst.

The fund seeks exposure to stocks and sectors that the fund's portfolio managers
perceive to be attractive from a valuation and fundamental standpoint. Portfolio
position sizes and sector weightings reflect the collaborative investment process
among the fund's portfolio managers and research analysts. The portfolio managers
also assess and manage the overall risk profile of the fund's portfolio.

Principal Risks

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.

o 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.

o 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.

o 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 typically lack the dividend yield that
can 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.

o 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.

o Liquidity risk. When there is little or no active trading market for a
security, the fund may not be able to sell the security in a timely manner at
its perceived value, which could cause the fund's share price to fall.

Performance

Since the fund has less than one full calendar year of performance, past
performance information is not included in the summary prospectus. Annual
performance returns provide some indication of the risks of investing in the
fund by showing changes in performance from year to year. Comparison of fund
performance to an appropriate index indicates how the fund's average annual
returns compare with 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. Recent performance is available at
www.dreyfus.com.

[1] The Dreyfus Corporation has contractually agreed, until February 1, 2014, 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 and distribution plan fees, shareholder services plan fees, taxes, interest expense, brokerage commissions, commitment fees on borrowings and extraordinary expenses) exceed 0.95%. On or after February 1, 2014, The Dreyfus Corporation may terminate this expense waiver at any time.

XML

Label	Element	Value
Risk Return [Abstract]	rr_RiskReturnAbstract
ProspectusDate	rr_ProspectusDate	Jan. 01, 2013
Dreyfus Opportunistic Midcap Value Fund (Prospectus Summary) | Dreyfus Opportunistic Midcap Value Fund
Risk Return [Abstract]	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 on page 9 of the Prospectus and in the How to Buy Shares section and the Additional Information About How to Buy Shares section on page II-1 and page III-1, respectively, of the fund's Statement of Additional Information. 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.
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. o 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. o 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. o 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. o 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. o Liquidity risk. When there is little or no active trading market for a security, the fund may not be able to sell the security in a timely manner at its perceived value, which could cause the fund's share price to fall.
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 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 Narrative [Text Block]	rr_BarChartNarrativeTextBlock	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.
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 9/30/12 was 12.76%.
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 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 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 12/31/11)
Dreyfus Opportunistic Midcap Value Fund (Prospectus Summary) | Dreyfus Opportunistic Midcap Value Fund | Russell Midcap Value Index
Risk Return [Abstract]	rr_RiskReturnAbstract
Label	rr_AverageAnnualReturnLabel	Russell Midcap Value Index reflects no deduction for fees, expenses or taxes
1 Year	rr_AverageAnnualReturnYear01	(1.38%)
5 Years	rr_AverageAnnualReturnYear05	0.04%
10 Years	rr_AverageAnnualReturnYear10	7.67%
Dreyfus Opportunistic Midcap Value Fund (Prospectus Summary) | Dreyfus Opportunistic Midcap Value Fund | Class A
Risk Return [Abstract]	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
Management fees	rr_ManagementFeesOverAssets	0.75%
Distribution (Rule 12b-1) fees	rr_DistributionAndService12b1FeesOverAssets	none
Other expenses (including shareholder services fees)	rr_OtherExpensesOverAssets	0.47%
Total annual fund operating expenses	rr_ExpensesOverAssets	1.22%
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 2002	rr_AnnualReturn2002	(33.32%)
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%)
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	Sep. 30, 2012
Bar Chart, Year to Date Return	rr_BarChartYearToDateReturn	12.76%
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%)
Label	rr_AverageAnnualReturnLabel	Class A returns before taxes
1 Year	rr_AverageAnnualReturnYear01	(11.23%)
5 Years	rr_AverageAnnualReturnYear05	2.65%
10 Years	rr_AverageAnnualReturnYear10	5.32%
Inception Date	rr_AverageAnnualReturnInceptionDate	Sep. 29, 1995
Dreyfus Opportunistic Midcap Value Fund (Prospectus Summary) | Dreyfus Opportunistic Midcap Value Fund | Class A | After Taxes on Distributions
Risk Return [Abstract]	rr_RiskReturnAbstract
Label	rr_AverageAnnualReturnLabel	Class A returns after taxes on distributions
1 Year	rr_AverageAnnualReturnYear01	(13.55%)
5 Years	rr_AverageAnnualReturnYear05	1.23%
10 Years	rr_AverageAnnualReturnYear10	4.26%
Inception Date	rr_AverageAnnualReturnInceptionDate	Sep. 29, 1995
Dreyfus Opportunistic Midcap Value Fund (Prospectus Summary) | Dreyfus Opportunistic Midcap Value Fund | Class A | After Taxes on Distributions and Sales
Risk Return [Abstract]	rr_RiskReturnAbstract
Label	rr_AverageAnnualReturnLabel	Class A returns after taxes on distributions and sale of fund shares
1 Year	rr_AverageAnnualReturnYear01	(4.64%)
5 Years	rr_AverageAnnualReturnYear05	1.83%
10 Years	rr_AverageAnnualReturnYear10	4.33%
Inception Date	rr_AverageAnnualReturnInceptionDate	Sep. 29, 1995
Dreyfus Opportunistic Midcap Value Fund (Prospectus Summary) | Dreyfus Opportunistic Midcap Value Fund | Class C
Risk Return [Abstract]	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 (Rule 12b-1) fees	rr_DistributionAndService12b1FeesOverAssets	0.75%
Other expenses (including shareholder services fees)	rr_OtherExpensesOverAssets	0.53%
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
Label	rr_AverageAnnualReturnLabel	Class C returns before taxes
1 Year	rr_AverageAnnualReturnYear01	(7.36%)
5 Years	rr_AverageAnnualReturnYear05	3.26%
10 Years	rr_AverageAnnualReturnYear10	5.63%
Inception Date	rr_AverageAnnualReturnInceptionDate	May 30, 2008
Dreyfus Opportunistic Midcap Value Fund (Prospectus Summary) | Dreyfus Opportunistic Midcap Value Fund | Class I
Risk Return [Abstract]	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 (Rule 12b-1) fees	rr_DistributionAndService12b1FeesOverAssets	none
Other expenses (including shareholder services fees)	rr_OtherExpensesOverAssets	0.25%
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
Label	rr_AverageAnnualReturnLabel	Class I returns before taxes
1 Year	rr_AverageAnnualReturnYear01	(5.61%)
5 Years	rr_AverageAnnualReturnYear05	4.05%
10 Years	rr_AverageAnnualReturnYear10	6.03%
Inception Date	rr_AverageAnnualReturnInceptionDate	May 30, 2008

XML

Label	Element	Value
Risk Return [Abstract]	rr_RiskReturnAbstract
Document Type	dei_DocumentType	485BPOS
Document Period End Date	dei_DocumentPeriodEndDate	Aug. 31, 2013
Registrant Name	dei_EntityRegistrantName	Advantage Funds, Inc.
Central Index Key	dei_EntityCentralIndexKey	0000914775
Amendment Flag	dei_AmendmentFlag	false
Document Creation Date	dei_DocumentCreationDate	Dec. 28, 2012
Document Effective Date	dei_DocumentEffectiveDate	Jan. 01, 2013
Dreyfus International Value Fund (Prospectus Summary) | Dreyfus International Value Fund | Class A
Risk Return [Abstract]	rr_RiskReturnAbstract
Trading Symbol	dei_TradingSymbol	DVLAX
Dreyfus International Value Fund (Prospectus Summary) | Dreyfus International Value Fund | Class C
Risk Return [Abstract]	rr_RiskReturnAbstract
Trading Symbol	dei_TradingSymbol	DICVX
Dreyfus International Value Fund (Prospectus Summary) | Dreyfus International Value Fund | Class I
Risk Return [Abstract]	rr_RiskReturnAbstract
Trading Symbol	dei_TradingSymbol	DIRVX
Dreyfus Opportunistic Midcap Value Fund (Prospectus Summary) | Dreyfus Opportunistic Midcap Value Fund | Class A
Risk Return [Abstract]	rr_RiskReturnAbstract
Trading Symbol	dei_TradingSymbol	DMCVX
Dreyfus Opportunistic Midcap Value Fund (Prospectus Summary) | Dreyfus Opportunistic Midcap Value Fund | Class C
Risk Return [Abstract]	rr_RiskReturnAbstract
Trading Symbol	dei_TradingSymbol	DVLCX
Dreyfus Opportunistic Midcap Value Fund (Prospectus Summary) | Dreyfus Opportunistic Midcap Value Fund | Class I
Risk Return [Abstract]	rr_RiskReturnAbstract
Trading Symbol	dei_TradingSymbol	DVLIX
Dreyfus Opportunistic Small Cap Fund (Prospectus Summary) | Dreyfus Opportunistic Small Cap Fund | Dreyfus Opportunistic Small Cap Fund
Risk Return [Abstract]	rr_RiskReturnAbstract
Trading Symbol	dei_TradingSymbol	DSCVX
Dreyfus Opportunistic U.S. Stock Fund (Prospectus Summary) | Dreyfus Opportunistic U.S. Stock Fund | Class A
Risk Return [Abstract]	rr_RiskReturnAbstract
Trading Symbol	dei_TradingSymbol	DOSAX
Dreyfus Opportunistic U.S. Stock Fund (Prospectus Summary) | Dreyfus Opportunistic U.S. Stock Fund | Class C
Risk Return [Abstract]	rr_RiskReturnAbstract
Trading Symbol	dei_TradingSymbol	DOSCX
Dreyfus Opportunistic U.S. Stock Fund (Prospectus Summary) | Dreyfus Opportunistic U.S. Stock Fund | Class I
Risk Return [Abstract]	rr_RiskReturnAbstract
Trading Symbol	dei_TradingSymbol	DOSIX
Dreyfus Strategic Value Fund (Prospectus Summary) | Dreyfus Strategic Value Fund | Class A
Risk Return [Abstract]	rr_RiskReturnAbstract
Trading Symbol	dei_TradingSymbol	DAGVX
Dreyfus Strategic Value Fund (Prospectus Summary) | Dreyfus Strategic Value Fund | Class C
Risk Return [Abstract]	rr_RiskReturnAbstract
Trading Symbol	dei_TradingSymbol	DCGVX
Dreyfus Strategic Value Fund (Prospectus Summary) | Dreyfus Strategic Value Fund | Class I
Risk Return [Abstract]	rr_RiskReturnAbstract
Trading Symbol	dei_TradingSymbol	DRGVX
Dreyfus Structured Midcap Fund (Prospectus Summary) | Dreyfus Structured Midcap Fund | Class A
Risk Return [Abstract]	rr_RiskReturnAbstract
Trading Symbol	dei_TradingSymbol	DPSAX
Dreyfus Structured Midcap Fund (Prospectus Summary) | Dreyfus Structured Midcap Fund | Class C
Risk Return [Abstract]	rr_RiskReturnAbstract
Trading Symbol	dei_TradingSymbol	DPSCX
Dreyfus Structured Midcap Fund (Prospectus Summary) | Dreyfus Structured Midcap Fund | Class I
Risk Return [Abstract]	rr_RiskReturnAbstract
Trading Symbol	dei_TradingSymbol	DPSRX
Dreyfus Technology Growth Fund (Prospectus Summary) | Dreyfus Technology Growth Fund | Class A
Risk Return [Abstract]	rr_RiskReturnAbstract
Trading Symbol	dei_TradingSymbol	DTGRX
Dreyfus Technology Growth Fund (Prospectus Summary) | Dreyfus Technology Growth Fund | Class C
Risk Return [Abstract]	rr_RiskReturnAbstract
Trading Symbol	dei_TradingSymbol	DTGCX
Dreyfus Technology Growth Fund (Prospectus Summary) | Dreyfus Technology Growth Fund | Class I
Risk Return [Abstract]	rr_RiskReturnAbstract
Trading Symbol	dei_TradingSymbol	DGVRX

XML

Dreyfus Opportunistic Small Cap Fund (Prospectus Summary) | Dreyfus Opportunistic Small Cap Fund

Fund Summary

Investment Objective

The fund seeks capital appreciation.

Fees and Expenses

This table describes the fees and expenses that you may pay if you buy and hold
shares of the fund.

Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)

Annual Fund Operating Expenses	Dreyfus Opportunistic Small Cap Fund
Management fees	0.75%
Other expenses (including shareholder services fees)	0.44%
Total annual fund operating expenses	1.19%

Example

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 (USD $)	Expense Example, with Redemption, 1 Year	Expense Example, with Redemption, 3 Years	Expense Example, with Redemption, 5 Years	Expense Example, with Redemption, 10 Years
Dreyfus Opportunistic Small Cap Fund	121	378	654	1,443

Portfolio Turnover

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 85.92%
of the average value of its portfolio.

Principal Investment Strategy

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 considers small cap companies to be those
companies with market capitalizations that fall within the range of
companies in the Russell 2000® Index at the time of purchase. Stocks
are selected for the fund's portfolio based primarily on bottom-up
fundamental analysis. The fund's portfolio managers use a disciplined
investment process that relies, in general, on proprietary fundamental
research and valuation. Generally, elements of the process include
analysis of mid-cycle business prospects, estimation of the intrinsic
value of the company and the identification of a revaluation catalyst.
In general, the fund seeks exposure to securities and sectors that the
fund's portfolio managers perceive to be attractive from a valuation
and fundamental standpoint.

Principal Risks

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.

o 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.

o 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.

o 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 typically lack the dividend yield that
can 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.

o 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.

o Liquidity risk. When there is little or no active trading market for a
security, the fund may not be able to sell the security in a timely manner at
its perceived value, which could cause the fund's share price to fall.

Performance

The following bar chart and table provide some indication of the risks of
investing in the fund. 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.

The bar chart shows changes in the performance of the fund's 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.

Year-by-Year Total Returns as of 12/31 each year (%)

Best Quarter
Q2, 2003: 39.66%
Worst Quarter
Q3, 2002: -36.65%

The fund's year-to-date total return as of 9/30/12 was 16.64%.

After-tax returns are calculated using the historical highest individual federal
marginal 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.

Average Annual Total Returns (as of 12/31/11)

Average Annual Total Returns	Label	1 Year	5 Years	10 Years
Dreyfus Opportunistic Small Cap Fund	Fund returns before taxes	(14.35%)	5.88%	6.35%
Dreyfus Opportunistic Small Cap Fund After Taxes on Distributions	Fund returns after taxes on distributions	(16.60%)	4.00%	5.16%
Dreyfus Opportunistic Small Cap Fund After Taxes on Distributions and Sales	Fund returns after taxes on distributions and sale of fund shares	(8.05%)	4.22%	5.05%
Dreyfus Opportunistic Small Cap Fund Russell 2000 Index	Russell 2000 Index reflects no deduction for fees, expenses or taxes	(4.18%)	0.15%	5.62%

XML

Label	Element	Value
Risk Return [Abstract]	rr_RiskReturnAbstract
ProspectusDate	rr_ProspectusDate	Jan. 01, 2013
Dreyfus Opportunistic Small Cap Fund (Prospectus Summary) | Dreyfus Opportunistic Small Cap Fund
Risk Return [Abstract]	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.
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 85.92% of the average value of its portfolio.
Portfolio Turnover, Rate	rr_PortfolioTurnoverRate	85.92%
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:
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 considers small cap companies to be those companies with market capitalizations that fall within the range of companies in the Russell 2000® Index at the time of purchase. Stocks are selected for the fund's portfolio based primarily on bottom-up fundamental analysis. The fund's portfolio managers use a disciplined investment process that relies, in general, on proprietary fundamental research and valuation. Generally, elements of the process include analysis of mid-cycle business prospects, estimation of the intrinsic value of the company and the identification of a revaluation catalyst. In general, the fund seeks exposure to securities and sectors that the fund's portfolio managers perceive to be attractive from a valuation and fundamental standpoint.
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. o 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. o 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. o 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 typically lack the dividend yield that can 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. o 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. o Liquidity risk. When there is little or no active trading market for a security, the fund may not be able to sell the security in a timely manner at its perceived value, which could cause the fund's share price to fall.
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 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 (%)
Bar Chart Narrative [Text Block]	rr_BarChartNarrativeTextBlock	The bar chart shows changes in the performance of the fund's 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.
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: 39.66% Worst Quarter Q3, 2002: -36.65% The fund's year-to-date total return as of 9/30/12 was 16.64%.
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 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 Narrative	rr_PerformanceTableNarrativeTextBlock	After-tax returns are calculated using the historical highest individual federal marginal 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.
Caption	rr_AverageAnnualReturnCaption	Average Annual Total Returns (as of 12/31/11)
Dreyfus Opportunistic Small Cap Fund (Prospectus Summary) | Dreyfus Opportunistic Small Cap Fund | Russell 2000 Index
Risk Return [Abstract]	rr_RiskReturnAbstract
Label	rr_AverageAnnualReturnLabel	Russell 2000 Index reflects no deduction for fees, expenses or taxes
1 Year	rr_AverageAnnualReturnYear01	(4.18%)
5 Years	rr_AverageAnnualReturnYear05	0.15%
10 Years	rr_AverageAnnualReturnYear10	5.62%
Dreyfus Opportunistic Small Cap Fund (Prospectus Summary) | Dreyfus Opportunistic Small Cap Fund | Dreyfus Opportunistic Small Cap Fund
Risk Return [Abstract]	rr_RiskReturnAbstract
Management fees	rr_ManagementFeesOverAssets	0.75%
Other expenses (including shareholder services fees)	rr_OtherExpensesOverAssets	0.44%
Total annual fund operating expenses	rr_ExpensesOverAssets	1.19%
Expense Example, with Redemption, 1 Year	rr_ExpenseExampleYear01	121
Expense Example, with Redemption, 3 Years	rr_ExpenseExampleYear03	378
Expense Example, with Redemption, 5 Years	rr_ExpenseExampleYear05	654
Expense Example, with Redemption, 10 Years	rr_ExpenseExampleYear10	1,443
Annual Return 2002	rr_AnnualReturn2002	(41.25%)
Annual Return 2003	rr_AnnualReturn2003	86.58%
Annual Return 2004	rr_AnnualReturn2004	12.72%
Annual Return 2005	rr_AnnualReturn2005	7.16%
Annual Return 2006	rr_AnnualReturn2006	5.04%
Annual Return 2007	rr_AnnualReturn2007	4.91%
Annual Return 2008	rr_AnnualReturn2008	(31.91%)
Annual Return 2009	rr_AnnualReturn2009	64.33%
Annual Return 2010	rr_AnnualReturn2010	32.35%
Annual Return 2011	rr_AnnualReturn2011	(14.35%)
Year to Date Return, Label	rr_YearToDateReturnLabel	The fund's year-to-date total return
Bar Chart, Year to Date Return, Date	rr_BarChartYearToDateReturnDate	Sep. 30, 2012
Bar Chart, Year to Date Return	rr_BarChartYearToDateReturn	16.64%
Highest Quarterly Return, Label	rr_HighestQuarterlyReturnLabel	Best Quarter
Highest Quarterly Return, Date	rr_BarChartHighestQuarterlyReturnDate	Jun. 30, 2003
Highest Quarterly Return	rr_BarChartHighestQuarterlyReturn	39.66%
Lowest Quarterly Return, Label	rr_LowestQuarterlyReturnLabel	Worst Quarter
Lowest Quarterly Return, Date	rr_BarChartLowestQuarterlyReturnDate	Sep. 30, 2002
Lowest Quarterly Return	rr_BarChartLowestQuarterlyReturn	(36.65%)
Label	rr_AverageAnnualReturnLabel	Fund returns before taxes
1 Year	rr_AverageAnnualReturnYear01	(14.35%)
5 Years	rr_AverageAnnualReturnYear05	5.88%
10 Years	rr_AverageAnnualReturnYear10	6.35%
Dreyfus Opportunistic Small Cap Fund (Prospectus Summary) | Dreyfus Opportunistic Small Cap Fund | Dreyfus Opportunistic Small Cap Fund | After Taxes on Distributions
Risk Return [Abstract]	rr_RiskReturnAbstract
Label	rr_AverageAnnualReturnLabel	Fund returns after taxes on distributions
1 Year	rr_AverageAnnualReturnYear01	(16.60%)
5 Years	rr_AverageAnnualReturnYear05	4.00%
10 Years	rr_AverageAnnualReturnYear10	5.16%
Dreyfus Opportunistic Small Cap Fund (Prospectus Summary) | Dreyfus Opportunistic Small Cap Fund | Dreyfus Opportunistic Small Cap Fund | After Taxes on Distributions and Sales
Risk Return [Abstract]	rr_RiskReturnAbstract
Label	rr_AverageAnnualReturnLabel	Fund returns after taxes on distributions and sale of fund shares
1 Year	rr_AverageAnnualReturnYear01	(8.05%)
5 Years	rr_AverageAnnualReturnYear05	4.22%
10 Years	rr_AverageAnnualReturnYear10	5.05%

XML

Dreyfus Opportunistic Midcap Value Fund (Prospectus Summary) | Dreyfus Opportunistic Midcap Value Fund

Fund Summary

Investment Objective

The fund seeks to surpass the performance of the Russell Midcap® Value Index.

Fees and Expenses

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 on page 9 of the Prospectus and in the How to Buy Shares section
and the Additional Information About How to Buy Shares section on page II-1 and
page III-1, respectively, of the fund's Statement of Additional Information.
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.

Shareholder Fees (fees paid directly from your investment)

Shareholder Fees Dreyfus Opportunistic Midcap Value Fund	Class A	Class C	Class I
Maximum sales charge (load) imposed on purchases (as a percentage of offering price)	5.75%	none	none
Maximum deferred sales charge (load) (as a percentage of lower of purchase or sale price)	none	1.00%	none

Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)

Annual Fund Operating Expenses Dreyfus Opportunistic Midcap Value Fund	Class A	Class C	Class I
Management fees	0.75%	0.75%	0.75%
Distribution (Rule 12b-1) fees	none	0.75%	none
Other expenses (including shareholder services fees)	0.47%	0.53%	0.25%
Total annual fund operating expenses	1.22%	2.03%	1.00%

Example

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 Dreyfus Opportunistic Midcap Value Fund (USD $)	Expense Example, with Redemption, 1 Year	Expense Example, with Redemption, 3 Years	Expense Example, with Redemption, 5 Years	Expense Example, with Redemption, 10 Years
Class A	692	940	1,207	1,967
Class C	306	637	1,093	2,358
Class I	102	318	552	1,225

You would pay the following expenses if you did not redeem your shares:

Expense Example, No Redemption Dreyfus Opportunistic Midcap Value Fund (USD $)	Expense Example, No Redemption, 1 Year	Expense Example, No Redemption, 3 Years	Expense Example, No Redemption, 5 Years	Expense Example, No Redemption, 10 Years
Class A	692	940	1,207	1,967
Class C	206	637	1,093	2,358
Class I	102	318	552	1,225

Portfolio Turnover

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.

Principal Investment Strategy

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.

Principal Risks

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.

o 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.

o 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.

o 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.

o 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.

o Liquidity risk. When there is little or no active trading market for a
security, the fund may not be able to sell the security in a timely manner
at its perceived value, which could cause the fund's share price to fall.

Performance

The following bar chart and table provide some indication of the risks of
investing in the fund. 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.

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.

Year-by-Year Total Returns as of 12/31 each year (%) -- Class A

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 9/30/12 was 12.76%.

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 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.

Average Annual Total Returns (as of 12/31/11)

Average Annual Total Returns Dreyfus Opportunistic Midcap Value Fund	Label	1 Year	5 Years	10 Years	Inception Date
Class A	Class A returns before taxes	(11.23%)	2.65%	5.32%	Sep. 29, 1995
Class A After Taxes on Distributions	Class A returns after taxes on distributions	(13.55%)	1.23%	4.26%	Sep. 29, 1995
Class A After Taxes on Distributions and Sales	Class A returns after taxes on distributions and sale of fund shares	(4.64%)	1.83%	4.33%	Sep. 29, 1995
Class C	Class C returns before taxes	(7.36%)	3.26%	5.63%	May 30, 2008
Class I	Class I returns before taxes	(5.61%)	4.05%	6.03%	May 30, 2008
Russell Midcap Value Index	Russell Midcap Value Index reflects no deduction for fees, expenses or taxes	(1.38%)	0.04%	7.67%

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Dreyfus Structured Midcap Fund (Prospectus Summary) | Dreyfus Structured Midcap Fund

Fund Summary

Investment Objective

The fund seeks long-term capital growth.

Fees and Expenses

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 on page 9 of the Prospectus and in the How to Buy Shares section
and the Additional Information About How to Buy Shares section on page II-1 and
page III-1, respectively, of the fund's Statement of Additional Information.
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.

Shareholder Fees (fees paid directly from your investment)

Shareholder Fees Dreyfus Structured Midcap Fund	Class A	Class C	Class I
Maximum sales charge (load) imposed on purchases (as a percentage of offering price)	5.75%	none	none
Maximum deferred sales charge (load) (as a percentage of lower of purchase or sale price)	none	1.00%	none

Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)

Annual Fund Operating Expenses Dreyfus Structured Midcap Fund		Class A	Class C	Class I
Management fees		0.75%	0.75%	0.75%
Distribution (12b-1) fees		none	0.75%	none
Other expenses (including shareholder services fees)		0.66%	0.64%	0.47%
Total annual fund operating expenses	[1]	1.41%	2.14%	1.22%
Fee waiver and/or expense reimbursement		(0.16%)	(0.14%)	(0.22%)
Total annual fund operating expenses (less fee waiver and/or expense reimbursement)		1.25%	2.00%	1.00%

Example

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:

Expense Example Dreyfus Structured Midcap Fund (USD $)	Expense Example, with Redemption, 1 Year	Expense Example, with Redemption, 3 Years	Expense Example, with Redemption, 5 Years	Expense Example, with Redemption, 10 Years
Class A	695	981	1,287	2,156
Class C	303	657	1,136	2,461
Class I	102	365	649	1,458

You would pay the following expenses if you did not redeem your shares:

Expense Example, No Redemption Dreyfus Structured Midcap Fund (USD $)	Expense Example, No Redemption, 1 Year	Expense Example, No Redemption, 3 Years	Expense Example, No Redemption, 5 Years	Expense Example, No Redemption, 10 Years
Class A	695	981	1,287	2,156
Class C	203	657	1,136	2,461
Class I	102	365	649	1,458

Portfolio Turnover

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
93.44% of the average value of its portfolio.

Principal Investment Strategy

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 companies included
in the S&P® Midcap 400 Index or the Russell Midcap® Index at the time of purchase.

The fund's portfolio managers select stocks through a "bottom-up," structured
approach that seeks to identify undervalued securities using a quantitative
screening process. This process is driven by a proprietary quantitative model
that measures a diverse set of characteristics of stocks to identify and rank
stocks based on valuation, momentum/sentiment, and earnings quality.

Next, the fund's portfolio managers construct the portfolio through a risk
controlled process, focusing on stock selection as opposed to making proactive
decisions as to industry and sector exposure. The fund seeks to maintain a
portfolio that has exposure to industries and market capitalizations that are
generally similar to those of the S&P Midcap 400 Index. Finally, within each
sector and style subset, the fund will seek to overweight the most attractive
stocks and underweight or not hold the stocks that have been ranked least
attractive.

Principal Risks

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.

o 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.

o 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.

o 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 typically lack the dividend yield that
can 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.

o Liquidity risk. When there is little or no active trading market for a security,
the fund may not be able to sell the security in a timely manner at its perceived
value, which could cause the fund's share price to fall.

Performance

The following bar chart and table provide some indication of the risks of
investing in the fund. 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.

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.

Year-by-Year Total Returns as of 12/31 each year (%) -- Class A

Best Quarter
Q3, 2009: 17.90%
Worst Quarter
Q4, 2008: -27.25%

The year-to-date total return of the fund's Class A shares as
of 9/30/12 was 14.48%.

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 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.

Average Annual Total Returns (as of 12/31/11)

Average Annual Total Returns Dreyfus Structured Midcap Fund	Label	1 Year	5 Years	10 Years
Class A	Class A returns before taxes	(5.81%)	(0.36%)	5.72%
Class A After Taxes on Distributions	Class A returns after taxes on distributions	(5.81%)	(0.68%)	5.40%
Class A After Taxes on Distributions and Sales	Class A returns after taxes on distributions and sale of fund shares	(3.78%)	(0.42%)	4.92%
Class C	Class C returns before taxes	(1.72%)	0.09%	5.54%
Class I	Class I returns before taxes	0.08%	1.05%	6.56%
Russell Midcap Index	Russell Midcap Index reflects no deduction for fees, expenses or taxes	(1.55%)	1.41%	6.99%
S&P Midcap 400 Index	S&P Midcap 400 Index reflects no deduction for fees, expenses or taxes	(1.73%)	3.32%	7.04%

[1] The Dreyfus Corporation has contractually agreed, until January 1, 2014, 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 distribution fees, shareholder services plan fees, taxes, interest expense, brokerage commissions and extraordinary expenses) exceed 1.00%. On or after January 1, 2014, The Dreyfus Corporation may terminate this expense waiver at any time.