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BNY Mellon International Fund  
Risk/Return: rr_RiskReturnAbstract  
Risk/Return [Heading] rr_RiskReturnHeading Fund Summary BNY Mellon International 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, hold and sell shares of the fund. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the table and examples below.

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 78.04% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 78.04%
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 hold or 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 65% of its total assets in equity securities of foreign issuers. Foreign issuers are companies organized under the laws of a foreign country, whose principal trading market is in a foreign country or with a majority of their assets or business outside the United States. The fund may invest in companies of any market capitalization. Though not specifically limited, the fund ordinarily will invest in a broad range of (and in any case at least five different) countries. The fund will limit its investments in any single company to no more than 5% of the fund's net assets at the time of purchase.

The stocks purchased may have value and/or growth characteristics. The fund's sub-adviser, Newton Investment Management North America, LLC (NIMNA), an affiliate of BNY Mellon Investment Adviser, Inc. (BNYM Investment Adviser), employs a bottom-up investment approach which emphasizes individual stock selection.

The stock selection process is designed to produce a diversified portfolio that, relative to the Morgan Stanley Capital International (MSCI) Europe, Australasia and Far East (EAFE) Index, has a below-average price/earnings ratio and an above-average earnings growth trend.

The fund typically sells a stock when, in the view of the fund's sub-adviser, it appears less likely to benefit from the current market and economic environment, shows deteriorating fundamentals or declining momentum, or falls short of the expectations of the fund's sub-adviser.
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 market conditions or because of factors that affect the particular company or the company's industry.

● 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.

● Small and midsize company risk. Small and midsize companies carry additional risks because the operating histories of these companies tend to be more limited, their earnings and revenues less predictable (and some companies may be experiencing significant losses), and their share prices more volatile than those of larger, more established companies. The shares of smaller companies tend to trade less frequently than those of larger, more established companies, which can adversely affect the pricing of these securities and the fund's ability to sell these securities.

● Growth 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. 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.

● 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 less liquidity, less developed or less efficient trading markets, lack of comprehensive company information, political and economic instability and differing auditing and legal standards.

● 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. 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.

● Liquidity risk. When there is little or no active trading market for specific types of securities, it can become more difficult to sell the securities in a timely manner at or near their perceived value. In such a market, the value of such securities and the fund's share price may fall dramatically. Investments that are illiquid or that trade in lower volumes may be more difficult to value. Investments in foreign securities tend to have greater exposure to liquidity risk than domestic securities.

● Market risk. The value of the securities in which the fund invests may be affected by political, regulatory, economic and social developments, and developments that impact specific economic sectors, industries or segments of the market.  In addition, turbulence in financial markets and reduced liquidity in equity, credit and/or fixed-income markets may negatively affect many issuers, which could adversely affect the fund.  Global economies and financial markets are becoming increasingly interconnected, and conditions and events in one country, region or financial market may adversely impact issuers in a different country, region or financial market.  These risks may be magnified if certain events or developments adversely interrupt the global supply chain; in these and other circumstances, such risks might affect companies world-wide. Recent examples include pandemic risks related to COVID-19 and aggressive measures taken world-wide in response by governments, including closing borders, restricting international

and domestic travel, and the imposition of prolonged quarantines of large populations, and by businesses, including changes to operations and reducing staff. 

● Management risk. The investment process used by the fund's sub-adviser could fail to achieve the fund's investment goal and cause your fund investment to lose value.

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 EAFE® Index.

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 U.S. 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.

The fund changed its investment strategy on August 6, 2015. Prior to that date, the fund allocated its assets between a core investment style and a value investment style at the discretion of the fund's investment adviser. Different investment strategies may lead to different performance results. The fund's performance for periods prior to August 6, 2015 shown in the bar chart and table reflects the fund's investment strategy in effect prior to that date.
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
Q4, 2020: 16.52%
Worst Quarter
Q1, 2020: -24.00%

The year-to-date total return of the fund's Class M shares as of September 30, 2022 was -29.61%.
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, 2022
Bar Chart, Year to Date Return rr_BarChartYearToDateReturn (29.61%)
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Best Quarter
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Dec. 31, 2020
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 16.52%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Worst Quarter
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Mar. 31, 2020
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (24.00%)
Index No Deduction for Fees, Expenses, Taxes [Text] rr_IndexNoDeductionForFeesExpensesTaxes reflects no deductions 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 U.S. tax-deferred arrangements such as 401(k) plans or individual retirement accounts.
Performance Table One Class of after Tax Shown [Text] rr_PerformanceTableOneClassOfAfterTaxShown After-tax performance is shown only for Class M shares. After-tax performance of the fund's Investor shares will vary.
Average Annual Return, Caption rr_AverageAnnualReturnCaption Average Annual Total Returns as of 12/31/21
BNY Mellon International Fund | MSCI EAFE® Index reflects no deductions for fees, expenses or taxes  
Risk/Return: rr_RiskReturnAbstract  
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 11.26%
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 9.55%
Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10 8.03%
BNY Mellon International Fund | Class M Shares  
Risk/Return: rr_RiskReturnAbstract  
Investment advisory fees rr_ManagementFeesOverAssets 0.85%
Shareholder services fees rr_Component1OtherExpensesOverAssets none
Administration fees rr_Component2OtherExpensesOverAssets 0.13%
Miscellaneous other expenses rr_Component3OtherExpensesOverAssets 0.05%
Total other expenses rr_OtherExpensesOverAssets 0.18%
Total annual fund operating expenses rr_ExpensesOverAssets 1.03%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 105
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 328
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 569
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 1,259
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 105
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 328
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 569
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 1,259
Annual Return 2012 rr_AnnualReturn2012 17.58%
Annual Return 2013 rr_AnnualReturn2013 26.47%
Annual Return 2014 rr_AnnualReturn2014 (7.27%)
Annual Return 2015 rr_AnnualReturn2015 1.05%
Annual Return 2016 rr_AnnualReturn2016 (1.36%)
Annual Return 2017 rr_AnnualReturn2017 27.97%
Annual Return 2018 rr_AnnualReturn2018 (16.66%)
Annual Return 2019 rr_AnnualReturn2019 22.26%
Annual Return 2020 rr_AnnualReturn2020 7.17%
Annual Return 2021 rr_AnnualReturn2021 9.31%
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 9.31%
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 8.84%
Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10 7.70%
BNY Mellon International Fund | Class M Shares | After Taxes on Distributions  
Risk/Return: rr_RiskReturnAbstract  
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 9.03%
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 8.54%
Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10 7.42%
BNY Mellon International Fund | Class M Shares | After Taxes on Distributions and Sale of Fund Shares  
Risk/Return: rr_RiskReturnAbstract  
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 6.07%
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 7.16%
Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10 6.40%
BNY Mellon International Fund | Investor Shares  
Risk/Return: rr_RiskReturnAbstract  
Investment advisory fees rr_ManagementFeesOverAssets 0.85%
Shareholder services fees rr_Component1OtherExpensesOverAssets 0.25%
Administration fees rr_Component2OtherExpensesOverAssets 0.13%
Miscellaneous other expenses rr_Component3OtherExpensesOverAssets 0.05%
Total other expenses rr_OtherExpensesOverAssets 0.43%
Total annual fund operating expenses rr_ExpensesOverAssets 1.28%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 130
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 406
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 702
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 1,545
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 130
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 406
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 702
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 1,545
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 9.06%
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 8.59%
Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10 7.44%