Label	Element	Value
Risk Return [Abstract]	rr_RiskReturnAbstract
ProspectusDate	rr_ProspectusDate	Jan. 01, 2013
Dreyfus Conservative Allocation Fund (Prospectus Summary) | Dreyfus Conservative Allocation 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 current income with some consideration for 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 25.89% of the average value of its portfolio.
Portfolio Turnover, Rate	rr_PortfolioTurnoverRate	25.89%
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:
Strategy [Heading]	rr_StrategyHeading	Principal Investment Strategy
Strategy Narrative [Text Block]	rr_StrategyNarrativeTextBlock	To pursue its goal, the fund normally allocates its net assets among other mutual funds advised by The Dreyfus Corporation or its affiliates, referred to as underlying funds, that invest in a wide range of equity and fixed-income securities. The fund normally allocates 60% of its assets to the fixed-income asset class and 40% of its assets to the equity asset class by investing in underlying funds that invest primarily in fixed-income and equity securities, respectively. The fund may invest in underlying funds that invest in U.S. and international fixed-income securities, which comprise the fixed-income asset category. The fund also may invest in underlying funds that invest in U.S. large-, mid- and small-cap equity securities, international equity securities, emerging markets equity securities and global equity securities, which comprise the equity asset category. Although an investor may achieve the same level of diversification by investing directly in a variety of Dreyfus-managed funds, the fund provides investors with a means to simplify their investment decisions by investing in a single diversified portfolio. The fund is designed for investors with lower risk tolerances. The underlying funds are selected by the Dreyfus Investment Committee based on their investment objectives and management policies, portfolio holdings, risk/reward profiles, historical performance, and other factors, including the correlation and covariance among the underlying funds. The underlying funds in which the fund may invest, as of the date of this Prospectus, are as follows: Equity Investments                                                                U.S. Large-Cap                              International                         Dreyfus Appreciation Fund, Inc.             Dreyfus/Newton International Equity                                               Fund                                  Dreyfus Research Growth Fund                Dreyfus International Equity Fund     Dreyfus Strategic Value Fund                Dreyfus International Value Fund      Dreyfus Disciplined Stock Fund              International Stock Fund              Dreyfus U.S. Equity Fund                    Dreyfus International Stock Index                                                 Fund                                  Dreyfus BASIC S&P 500 Stock Index Fund      Emerging Markets                      U.S. Mid-/Small-Cap                         Dreyfus Emerging Markets Fund         Dreyfus Select Managers Small Cap Value     Global                                Fund                                         Dreyfus Opportunistic Midcap Value Fund     Dreyfus Global Absolute Return Fund   Dreyfus MidCap Core Fund                    Dreyfus Global Real Estate Securities                                             Fund                                  Dreyfus/The Boston Company Small/Mid Cap                                          Growth Fund                                  Dreyfus Smallcap Stock Index Fund                                                 Dreyfus Midcap Index Fund, Inc.                                                                                                                                     Fixed-Income Investments                                                          U.S. Fixed-Income                           International Fixed-Income            Dreyfus Total Return Advantage Fund         Dreyfus Emerging Markets Debt Local                                               Currency Fund                         Dreyfus Short-Intermediate Government Fund  Dreyfus International Bond Fund       Dreyfus GNMA Fund                                                                 Dreyfus Opportunistic Fixed Income Fund                                           Dreyfus High Yield Fund                                                           Dreyfus Bond Market Index Fund                                                    Dreyfus Inflation Adjusted Securities Fund                                        Dreyfus U.S. Treasury Intermediate Term                                           Fund                                         Dreyfus U.S. Treasury Long Term Fund
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. An investment in the fund is subject to the following principal risks: o Allocation risk. The ability of the fund to achieve its investment goal depends, in part, on the ability of the Dreyfus Investment Committee to allocate effectively the fund's assets among the underlying funds. There can be no assurance that the actual allocations will be effective in achieving the fund's investment goal. The underlying funds may not achieve their investment objectives, and their performance may be lower than that of the overall performance of the asset class the underlying funds were selected to represent. The fund typically invests in a number of different underlying funds; however, to the extent the fund invests a significant portion of its assets in a single underlying fund, the fund will be more sensitive to the risks associated with that underlying fund and any investments in which that underlying fund concentrates. o Conflicts of interest risk. The fund's investment adviser, The Dreyfus Corporation, or its affiliates may serve as investment adviser to the underlying funds. The interests of the fund on the one hand, and those of an underlying fund on the other, will not always be the same. Therefore, conflicts may arise as the investment adviser fulfills its fiduciary duty to the fund and the underlying funds. In addition, the Dreyfus Investment Committee recommends asset allocations among the underlying funds, each of which pays advisory fees at different rates to The Dreyfus Corporation or its affiliates. These situations are considered by the fund's board when it reviews the asset allocations for the fund. o Correlation risk. Although the prices of equity securities and fixed-income securities often rise and fall at different times so that a fall in the price of one may be offset by a rise in the price of the other, in down markets the prices of these securities can also fall in tandem. Because the fund invests in equity securities and fixed-income securities, it is subject to correlation risk. The fund is subject to the same principal risks as the underlying funds in which it invests, which are summarized below. For more information regarding these and other risks of the underlying funds, see the prospectus for the specific underlying fund. 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 Large cap stock risk. To the extent the fund invests in large capitalization stocks, the fund may underperform funds that invest primarily in the stocks of lower quality, smaller capitalization companies during periods when the stocks of such companies are in favor. 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 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. These risks are heightened for investments in emerging markets. o Interest rate risk. Prices of bonds tend to move inversely with changes in interest rates. Typically, a rise in rates will adversely affect bond prices and, accordingly, the fund's share price. The longer the effective maturity and duration of the fund's portfolio, the more the fund's share price is likely to react to interest rates. o Credit risk. Failure of an issuer to make timely interest or principal payments, or a decline or perception of a decline in the credit quality of a bond, can cause a bond's price to fall, potentially lowering the fund's share price. The lower a bond's credit rating, the greater the chance - in the rating agency's opinion - that the bond issuer will default or fail to meet its payment obligations. High yield ("junk") bonds involve greater credit risk, including the risk of default, than investment grade bonds, and are considered predominantly speculative with respect to the issuer's ability to make principal and interest payments. The prices of high yield bonds can fall dramatically in response to bad news about the issuer or its industry, or the economy in general. 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. Investments in foreign securities, particularly those of issuers located in emerging markets, tend to have greater exposure to liquidity risk than domestic securities.
Risk Lose Money [Text]	rr_RiskLoseMoney	The fund's share price fluctuates, sometimes dramatically, which means you could lose money.
Risk Not Insured Depository Institution [Text]	rr_RiskNotInsuredDepositoryInstitution	An investment in the fund is not a bank deposit. It is not insured or guaranteed by the Federal Deposit Insurance Corporation (FDIC) or any other government agency.
Bar Chart and Performance Table [Heading]	rr_BarChartAndPerformanceTableHeading	Performance
Performance Narrative [Text Block]	rr_PerformanceNarrativeTextBlock	The following bar chart and table provide some indication of the risks of investing in the fund. The 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.
Bar Chart Closing [Text Block]	rr_BarChartClosingTextBlock	Best Quarter Q3, 2010: 7.51% Worst Quarter Q3, 2011: -7.46% The fund's year-to-date total return as of 9/30/12 was 8.72%.
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 Conservative Allocation Fund (Prospectus Summary) | Dreyfus Conservative Allocation 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%
Since Inception	rr_AverageAnnualReturnSinceInception	10.26%
Inception Date	rr_AverageAnnualReturnInceptionDate	Oct. 01, 2009
Dreyfus Conservative Allocation Fund (Prospectus Summary) | Dreyfus Conservative Allocation Fund | Customized Blended Index
Risk Return [Abstract]	rr_RiskReturnAbstract
Label	rr_AverageAnnualReturnLabel	Customized Blended Index reflects no deduction for fees, expenses or taxes
1 Year	rr_AverageAnnualReturnYear01	5.54%
Since Inception	rr_AverageAnnualReturnSinceInception	8.03%
Inception Date	rr_AverageAnnualReturnInceptionDate	Oct. 01, 2009
Dreyfus Conservative Allocation Fund (Prospectus Summary) | Dreyfus Conservative Allocation Fund | Dreyfus Conservative Allocation Fund
Risk Return [Abstract]	rr_RiskReturnAbstract
Management fees	rr_ManagementFeesOverAssets	none
Other expenses (including shareholder services fees)	rr_OtherExpensesOverAssets	0.84%
Underlying funds fees	rr_AcquiredFundFeesAndExpensesOverAssets	0.64%
Total annual fund and underlying funds operating expenses	rr_ExpensesOverAssets	1.48%	[1]
Fee waiver and/or expense reimbursement	rr_FeeWaiverOrReimbursementOverAssets	(0.55%)
Total annual fund and underlying funds operating expenses (after fee waiver and/or expense reimbursement)	rr_NetExpensesOverAssets	0.93%	[1]
Fee Waiver or Reimbursement over Assets, Date of Termination	rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination	2014-01-01
Expense Example, with Redemption, 1 Year	rr_ExpenseExampleYear01	95
Expense Example, with Redemption, 3 Years	rr_ExpenseExampleYear03	414
Expense Example, with Redemption, 5 Years	rr_ExpenseExampleYear05	756
Expense Example, with Redemption, 10 Years	rr_ExpenseExampleYear10	1,721
Annual Return 2010	rr_AnnualReturn2010	10.97%
Annual Return 2011	rr_AnnualReturn2011	0.47%
Year to Date Return, Label	rr_YearToDateReturnLabel	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	8.72%
Highest Quarterly Return, Label	rr_HighestQuarterlyReturnLabel	Best Quarter
Highest Quarterly Return, Date	rr_BarChartHighestQuarterlyReturnDate	Sep. 30, 2010
Highest Quarterly Return	rr_BarChartHighestQuarterlyReturn	7.51%
Lowest Quarterly Return, Label	rr_LowestQuarterlyReturnLabel	Worst Quarter
Lowest Quarterly Return, Date	rr_BarChartLowestQuarterlyReturnDate	Sep. 30, 2011
Lowest Quarterly Return	rr_BarChartLowestQuarterlyReturn	(7.46%)
Label	rr_AverageAnnualReturnLabel	Fund returns before taxes
1 Year	rr_AverageAnnualReturnYear01	0.47%
Since Inception	rr_AverageAnnualReturnSinceInception	6.21%
Inception Date	rr_AverageAnnualReturnInceptionDate	Oct. 01, 2009
Dreyfus Conservative Allocation Fund (Prospectus Summary) | Dreyfus Conservative Allocation Fund | Dreyfus Conservative Allocation Fund | After Taxes on Distributions
Risk Return [Abstract]	rr_RiskReturnAbstract
Label	rr_AverageAnnualReturnLabel	Fund returns after taxes on distributions
1 Year	rr_AverageAnnualReturnYear01	0.11%
Since Inception	rr_AverageAnnualReturnSinceInception	5.74%
Inception Date	rr_AverageAnnualReturnInceptionDate	Oct. 01, 2009
Dreyfus Conservative Allocation Fund (Prospectus Summary) | Dreyfus Conservative Allocation Fund | Dreyfus Conservative Allocation 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	0.77%
Since Inception	rr_AverageAnnualReturnSinceInception	5.23%
Inception Date	rr_AverageAnnualReturnInceptionDate	Oct. 01, 2009

[1] The Dreyfus Corporation has contractually agreed, until January 1, 2014, to assume the expenses of the fund so that the total annual fund and underlying funds operating expenses (excluding taxes, interest expense, brokerage commissions, commitment fees on borrowings and extraordinary expenses) do not exceed .93%. On or after January 1, 2014, The Dreyfus Corporation may terminate this expense waiver at any time.