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BNY Mellon Emerging Markets Fund  
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, 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 60.15% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 60.15%
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 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's portfolio allocations, sector weightings and risk characteristics are a result of bottom-up fundamental analysis and may vary from those of the MSCI Emerging Markets Index at any given time. Normally, the fund will invest in companies in a broad range of (and in any case at least five different) emerging market countries and may invest in companies of any market capitalization. The stocks purchased for the fund may have value and/or growth characteristics.

The fund's sub-adviser, Newton Investment Management Limited (NIM), an affiliate of BNY Mellon Investment Adviser, Inc. (BNYM Investment Adviser), employs a bottom-up investment approach which emphasizes individual stock selection. In selecting stocks for the fund's portfolio, NIM considers the qualitative and quantitative attributes of companies within the emerging markets investment universe, including governance standards, long term growth outlook, business franchise quality, pricing power, returns on invested capital and financial leverage. The stock selection process is designed to produce a diversified portfolio of equity securities perceived by NIM to have attractive quality and growth characteristics and priced at a level that offers an attractive risk-reward profile for investors. The fund may overweight or underweight certain emerging market countries, companies, industries or market sectors relative to the MSCI Emerging Markets Index. In addition, the fund may, from time to time, invest a significant portion (more than 20%) of its total assets in securities of companies in certain sectors or located in particular emerging market countries. As of the date of this prospectus, the fund expects to have significant exposure to securities of companies in China, India, South Korea and Taiwan. The fund also currently expects to have significant exposure to securities of companies in the information technology, financials and consumer staples sectors.

The fund typically sells a stock when the fund's sub-adviser determines the attributes of the business have fundamentally deteriorated relative to their previously held view, or when developments (including stock price moves) have caused the risk-reward profile of the investment to have fundamentally deteriorated.
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.

● 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, particularly the currencies of emerging market countries, 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 or doing substantial business in emerging market countries tend to be more volatile and less liquid than the securities of issuers located in countries with more mature economies. Emerging markets generally have less diverse and less mature economic structures and less stable political systems than those of developed countries. Investments in these countries may be subject to political, economic, legal, market and currency risks. Special risks associated with investments in emerging market issuers may include a lack of publicly available information, a lack of uniform disclosure, accounting and financial reporting and recordkeeping standards and limited investor protections applicable in developed economies. The risks also may include unpredictable political and economic policies, the imposition of capital controls and/or foreign investment limitations by a country, nationalization of businesses and the imposition of sanctions or restrictions on certain investments by other countries, such as the United States.

● Country, company, industry and market sector risk. The fund may overweight or underweight its investments in certain countries, companies, industries or market sectors relative to the MSCI Emerging Markets Index, which may cause the fund's performance to be more or less sensitive to positive or negative developments affecting those countries, companies, industries or sectors.

● China risk. Investments in China are subject to the risks associated with greater governmental control over the economy, political and legal uncertainties and currency fluctuations or blockage. In particular, the Chinese

Communist Party exercises significant control over economic growth in China through the allocation of resources, controlling payment of foreign currency-denominated obligations, setting monetary policy and providing preferential treatment to particular industries or companies. Attempts by the government of the People's Republic of China to exert greater control over Hong Kong's economic, political and legal structures or its existing social policy, could negatively affect investor confidence in Hong Kong, which in turn could negatively affect markets and business performance of issuers located in Hong Kong. The Chinese economy and markets may be adversely affected by protectionist trade policies, slow economic activity in other Asian countries or worldwide, political and social instability, environmental events and natural disasters, regional and global conflicts, terrorism and war, including actions that are contrary to the interests of the United States. China's economy may be dependent on the economies of other Asian countries, many of which are developing countries. In addition, the imposition of tariffs or other trade barriers by the U.S. or other foreign governments on exports from China may have an adverse impact on Chinese issuers and China's economy as a whole. Additionally, U.S. executive orders current prohibit U.S. persons, including the fund, from transacting in securities of any Chinese company identified as a "Communist Chinese military company" or determined to be involved with China's "surveillance technology sector," including transactions in instruments that are derivative of, or are designed to provide investment exposure to, prohibited securities of such companies. It is unclear how long the executive orders will continue in effect, but to the extent that they do and further companies are designated, there may be a material adverse impact on the value of those securities.

● India risk. Investments in Indian issuers involve risks that are specific to India, including exposure to currency fluctuations, less liquidity, expropriation, confiscatory taxation, and exchange control regulations (including currency blockage). The securities markets in India are relatively underdeveloped and may subject the fund to higher transaction costs or greater uncertainty than investments in more developed securities markets. Further, the fund's investments are subject to fluctuations in the value of the Indian rupee. Inflation and rapid fluctuations in inflation and interest rates have had, and may continue to have, negative effects on the economy and securities markets of India. A high proportion of the securities of many Indian issuers are held by a limited number of persons or entities, which may limit the number of shares available for investment by the fund. Also, a limited number of issuers represent a disproportionately large percentage of market capitalization and trading value. In addition, religious and border disputes persist in India. India has historically experienced hostilities with neighboring countries, such as Pakistan and China, and the Indian government has confronted separatist movements in several Indian states. Instability as a result of these social and political tensions could adversely impact the value of the fund's investments in India.

● South Korea risk. Investments in South Korean issuers may subject the fund to legal, regulatory, political, currency, security, and economic risks that are specific to South Korea. In addition, economic and political developments of South Korea's neighbors, including escalated tensions involving North Korea and any outbreak of hostilities involving North Korea, or even the threat of an outbreak of such hostilities, may have a severe adverse effect on the South Korean economy.

● Taiwan risk. Investments in Taiwanese issuers involve risks that are specific to Taiwan, including legal, regulatory, political, currency and economic risks. Political and economic developments of Taiwan's neighbors may have an adverse effect on Taiwan's economy. Specifically, Taiwan's geographic proximity and history of political contention with mainland China have resulted in ongoing tensions, which may materially affect the Taiwanese economy and its securities market.

● Information technology sector risk. The information technology sector has been among the most volatile sectors of the stock market. To the extent the fund's investments are significantly exposed to companies in the information technology sector, the fund's performance will be significantly affected by developments in that sector. Information 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 information 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 information technology stocks than it does in other sectors. Fund investments may decline dramatically in value if anticipated products or services are delayed or cancelled.

● Financials sector risk. Companies in the financials sector are subject to extensive governmental regulation which may limit both the amounts and types of loans and other financial commitments they can make, the interest rates and fees they can charge, the scope of their activities, the prices they can charge and the amount of capital they must maintain. Profitability is largely dependent on the availability and cost of capital funds and can fluctuate significantly when interest rates change or due to increased competition. In addition, deterioration of the credit markets generally may cause an adverse impact in a broad range of markets, thereby affecting a wide range of financial institutions and

markets. Certain events in the financial services sector may cause an unusually high degree of volatility in the financial markets and cause certain financial services companies to incur large losses.

● Consumer staples sector risk. The consumer staples sector can be significantly affected by demographics and product trends, competitive pricing, food fads, marketing campaigns, environmental factors, government regulation, the performance of the overall economy, interest rates, consumer confidence, and the cost of commodities.

● 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.

● 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, particularly those of issuers located in emerging markets, 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 Emerging Markets 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. In addition, effective October 21, 2022, NIM became the fund's sub-adviser and the fund's investment approach, process and strategy was modified. Different investment strategies may lead to different performance results. The fund's performance for periods prior to August 6, 2015 and October 21, 2022 shown in the bar chart and table reflects the fund's investment strategy in effect prior to those dates.
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, 2020: 20.19%
Worst Quarter
Q1, 2020: -26.73%

The year-to-date total return of the fund's Class M shares as of September 30, 2022 was -28.90%.
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 (28.90%)
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Best Quarter
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Jun. 30, 2020
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 20.19%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Worst Quarter
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Mar. 31, 2020
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (26.73%)
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 Emerging Markets Fund | MSCI Emerging Markets Index reflects no deductions for fees, expenses or taxes  
Risk/Return: rr_RiskReturnAbstract  
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 (2.54%)
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 9.87%
Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10 5.49%
BNY Mellon Emerging Markets Fund | Class M Shares  
Risk/Return: rr_RiskReturnAbstract  
Investment advisory fees rr_ManagementFeesOverAssets 1.15%
Shareholder services fees rr_Component1OtherExpensesOverAssets none
Administration fees rr_Component2OtherExpensesOverAssets 0.13%
Miscellaneous other expenses rr_Component3OtherExpensesOverAssets 0.15%
Total other expenses rr_OtherExpensesOverAssets 0.28%
Total annual fund operating expenses rr_ExpensesOverAssets 1.43%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 146
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 452
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 782
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 1,713
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 146
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 452
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 782
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 1,713
Annual Return 2012 rr_AnnualReturn2012 16.95%
Annual Return 2013 rr_AnnualReturn2013 (1.98%)
Annual Return 2014 rr_AnnualReturn2014 (4.58%)
Annual Return 2015 rr_AnnualReturn2015 (16.64%)
Annual Return 2016 rr_AnnualReturn2016 10.62%
Annual Return 2017 rr_AnnualReturn2017 42.59%
Annual Return 2018 rr_AnnualReturn2018 (19.34%)
Annual Return 2019 rr_AnnualReturn2019 21.95%
Annual Return 2020 rr_AnnualReturn2020 12.95%
Annual Return 2021 rr_AnnualReturn2021 5.40%
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 5.40%
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 10.80%
Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10 5.35%
BNY Mellon Emerging Markets Fund | Class M Shares | After Taxes on Distributions  
Risk/Return: rr_RiskReturnAbstract  
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 5.16%
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 10.75%
Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10 5.36%
BNY Mellon Emerging Markets Fund | Class M Shares | After Taxes on Distributions and Sale of Fund Shares  
Risk/Return: rr_RiskReturnAbstract  
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 3.82%
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 8.84%
Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10 4.53%
BNY Mellon Emerging Markets Fund | Investor Shares  
Risk/Return: rr_RiskReturnAbstract  
Investment advisory fees rr_ManagementFeesOverAssets 1.15%
Shareholder services fees rr_Component1OtherExpensesOverAssets 0.25%
Administration fees rr_Component2OtherExpensesOverAssets 0.13%
Miscellaneous other expenses rr_Component3OtherExpensesOverAssets 0.15%
Total other expenses rr_OtherExpensesOverAssets 0.53%
Total annual fund operating expenses rr_ExpensesOverAssets 1.68%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 171
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 530
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 913
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 1,987
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 171
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 530
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 913
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 1,987
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 5.12%
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 10.52%
Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10 5.08%