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Risk/Return: rr_RiskReturnAbstract  
Risk/Return [Heading] rr_RiskReturnHeading Fund Summary - BNY Mellon Emerging Markets Fund
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.

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 53.25% of the average value of its portfolio.

Portfolio Turnover, Rate rr_PortfolioTurnoverRate 53.25%
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 invests at least 80% of its net assets, plus any borrowings for investment purposes, in equity securities of companies organized, or with a majority of assets or operations, in countries considered to be emerging markets. Emerging market countries generally include all countries represented by the Morgan Stanley Capital International (MSCI) Emerging Markets Index. The fund may invest in companies of any size.


The fund allocates its assets between a core investment style and a value investment style at the discretion of the investment adviser. The fund is not managed to a specific target allocation between these investment styles. Normally, the fund will invest the portion of its assets allocated to the core investment style in a broad range of (and in any case at least five different) emerging market countries, and will not invest more than 25% of its total assets allocated to the value investment style in the securities of companies in any one emerging market country.


The core investment style portfolio managers employ a bottom-up investment approach which emphasizes individual stock selection. The core investment style stock selection process is designed to produce a diversified portfolio that, relative to the MSCI Emerging Markets Index, has a below-average price/earnings ratio and an above-average earnings growth trend.


The fund's value investment style is research driven and risk averse. In selecting stocks, the value style portfolio manager emphasizes individual stock selection rather than economic and industry trends, and identifies potential investments through extensive quantitative and fundamental research.

Risk [Heading] rr_RiskHeading Principal Risks
Risk Narrative [Text Block] rr_RiskNarrativeTextBlock

An investment in the fund is not a bank deposit. It is not insured or guaranteed by the Federal Deposit Insurance Corporation (FDIC) or any other government agency. It is not a complete investment program. The fund's share price fluctuates, sometimes dramatically, which means you could lose money.


· Risks of stock investing. Stocks generally fluctuate more in value than bonds and may decline significantly over short time periods. There is the chance that stock prices overall will decline because stock markets tend to move in cycles, with periods of rising prices and falling prices. The market value of a stock may decline due to general weakness in the stock market or because of factors that affect the company or its particular industry.


· 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.


· Foreign investment risk. To the extent the fund invests in foreign securities, the fund's performance will be influenced by political, social and economic factors affecting investments in foreign issuers. Special risks associated with investments in foreign issuers include exposure to currency fluctuations, less liquidity, less developed or less efficient trading markets, lack of comprehensive company information, political and economic instability and differing auditing and legal standards. Investments denominated in foreign currencies are subject to the risk that such currencies will decline in value relative to the U.S. dollar and affect the value of these investments held by the fund.


· 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.


· Emerging market risk. The securities of issuers located in emerging markets tend to be more volatile and less liquid than the securities of issuers located in more mature economies, and emerging markets generally have less diverse and less mature economic structures and less stable political systems than those of developed countries. The securities of issuers located or doing substantial business in emerging markets are often subject to rapid and large changes in price.


· 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.


· Liquidity risk. When there is little or no active trading market for specific types of securities, it can become more difficult to sell the securities in a timely manner at or near their perceived value. In such a market, the value of such securities and the fund's share price may fall dramatically.

Risk Lose Money [Text] rr_RiskLoseMoney The fund's share price fluctuates, sometimes dramatically, which means you could lose money.
Risk Not Insured Depository Institution [Text] rr_RiskNotInsuredDepositoryInstitution An investment in the fund is not a bank deposit. It is not insured or guaranteed by the Federal Deposit Insurance Corporation (FDIC) or any other government agency.
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading Performance
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock

The following bar chart and table provide some indication of the risks of investing in the fund. The bar chart shows the performance of the fund's Class M shares from year to year. The table compares the average annual total returns of the fund's Class M shares and Investor shares to those of the MSCI Emerging Markets Index, an unmanaged index designed to measure the performance of stocks in emerging market countries in Europe, Latin America and the Pacific Basin open to non-local investors.


After-tax performance is shown only for Class M shares. After-tax performance of the fund's Investor shares 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.


The fund's past performance (before and after taxes) is not necessarily an indication of how the fund will perform in the future. Performance for each share class will vary due to differences in expenses.

Performance Information Illustrates Variability of Returns [Text] rr_PerformanceInformationIllustratesVariabilityOfReturns The following bar chart and table provide some indication of the risks of investing in the fund.
Performance 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 M
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock

Best Quarter
Q2, 2009: 34.49%
 Worst Quarter
Q4, 2008: -26.01%


The year-to-date total return of the fund's Class M shares as of September 30, 2013 was -4.59%.

Year to Date Return, Label rr_YearToDateReturnLabel The year-to-date total return of the fund's Class M shares
Bar Chart, Year to Date Return, Date rr_BarChartYearToDateReturnDate Sep. 30, 2013
Bar Chart, Year to Date Return rr_BarChartYearToDateReturn (4.59%)
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Best Quarter
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Jun. 30, 2009
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 34.49%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Worst Quarter
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Dec. 31, 2008
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (26.01%)
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 M shares. After-tax performance of the fund's Investor shares will vary.
Caption rr_AverageAnnualReturnCaption Average Annual Total Returns as of 12/31/12
MSCI Emerging Markets Index reflects no deduction for fees, expenses or taxes
  
Risk/Return: rr_RiskReturnAbstract  
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 18.22%
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 (0.92%)
Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10 16.52%
Class M Shares
  
Risk/Return: rr_RiskReturnAbstract  
Investment advisory fees rr_ManagementFeesOverAssets 1.15%
Other expenses - Shareholder services fees rr_Component1OtherExpensesOverAssets none
Other expenses - Administration fees rr_Component2OtherExpensesOverAssets 0.12%
Other expenses - Other expenses of the fund rr_Component3OtherExpensesOverAssets 0.14%
Total annual fund operating expenses rr_ExpensesOverAssets 1.41%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 144
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 446
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 771
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 1,691
Annual Return 2003 rr_AnnualReturn2003 53.14%
Annual Return 2004 rr_AnnualReturn2004 27.35%
Annual Return 2005 rr_AnnualReturn2005 26.35%
Annual Return 2006 rr_AnnualReturn2006 27.63%
Annual Return 2007 rr_AnnualReturn2007 27.49%
Annual Return 2008 rr_AnnualReturn2008 (47.51%)
Annual Return 2009 rr_AnnualReturn2009 74.33%
Annual Return 2010 rr_AnnualReturn2010 16.72%
Annual Return 2011 rr_AnnualReturn2011 (21.66%)
Annual Return 2012 rr_AnnualReturn2012 16.95%
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 16.95%
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 (0.43%)
Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10 14.65%
Class M Shares | After Taxes on Distributions
  
Risk/Return: rr_RiskReturnAbstract  
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 17.04%
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 (1.84%)
Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10 12.42%
Class M Shares | After Taxes on Distributions and Sale of Fund Shares
  
Risk/Return: rr_RiskReturnAbstract  
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 11.50%
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 (0.76%)
Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10 12.66%
Investor Shares
  
Risk/Return: rr_RiskReturnAbstract  
Investment advisory fees rr_ManagementFeesOverAssets 1.15%
Other expenses - Shareholder services fees rr_Component1OtherExpensesOverAssets 0.25%
Other expenses - Administration fees rr_Component2OtherExpensesOverAssets 0.12%
Other expenses - Other expenses of the fund rr_Component3OtherExpensesOverAssets 0.13%
Total annual fund operating expenses rr_ExpensesOverAssets 1.65%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 168
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 520
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 897
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,955
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 16.63%
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 (0.69%)
Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10 14.28%