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Label Element Value
Emerging Markets Fund  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk/Return [Heading] rr_RiskReturnHeading Emerging Markets Fund
Objective [Heading] rr_ObjectiveHeading INVESTMENT OBJECTIVE
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock
The Emerging Markets Fund seeks long-term capital appreciation by investing primarily in equity securities in emerging markets around the world.
Expense [Heading] rr_ExpenseHeading FUND 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 pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the tables and examples below. You may qualify for Class A sales charge discounts if you and your family (includes spouse and children under age 21) invest, or agree to invest in the future, at least $25,000, in the aggregate, in Classes A and C of the VanEck Funds. More information about these and other discounts is available from your financial professional and in the “Shareholder Information-Sales Charges” section of this prospectus, in the “Availability of Discounts” section of the Fund’s Statement of Additional Information (“SAI”) and, with respect to purchases of shares through specific intermediaries, in Appendix A to this prospectus, entitled “Intermediary Sales Charge Discounts and Waivers”. Investors may pay commissions and/or other forms of compensation to an intermediary, such as a broker, for transactions in Class Z shares, which are not reflected in the table or the example below.
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)
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination May 1, 2025
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 rate may indicate that the Fund pays 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 11% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 11.00%
Expense Example [Heading] rr_ExpenseExampleHeading EXPENSE EXAMPLE
Expense Example Narrative [Text Block] rr_ExpenseExampleNarrativeTextBlock The following 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 either redeem all of your shares at the end of these periods or continue to hold them. The example also assumes that your investment has a 5% return each year and that the Fund’s operating expenses remain the same, and applies fee waivers and/or expense reimbursements, if any, for the periods indicated above under “Annual Fund Operating Expenses.” Although your actual expenses may be higher or lower, based on these assumptions, your costs would be:
Expense Example by, Year, Caption [Text] rr_ExpenseExampleByYearCaption Sold
Expense Example, No Redemption, By Year, Caption [Text] rr_ExpenseExampleNoRedemptionByYearCaption Held
Strategy [Heading] rr_StrategyHeading PRINCIPAL INVESTMENT STRATEGIES
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock
Under normal conditions, the Fund invests at least 80% of its net assets in securities of companies that are organized in, maintain at least 50% of their assets in, or derive at least 50% of their revenues from, emerging market countries. The Adviser has broad discretion to identify countries that it considers to qualify as emerging markets. The Adviser selects emerging market countries that the Fund will invest in based on the Adviser’s evaluation of economic fundamentals, legal structure, political developments and other specific factors the Adviser believes to be relevant.
Utilizing qualitative and quantitative measures, the Adviser seeks to invest in reasonably-priced companies that have strong structural growth potential. The Adviser seeks attractive investment opportunities in all areas of emerging markets, and utilizes a flexible investment approach across all market capitalizations. The Adviser seeks to (i) integrate financially-material environmental, social and governance (“ESG”) factors into the Fund’s investment process and (ii) reduce material exposure to issuers that the Adviser deems controversial in the ESG universe.
The Fund’s holdings may include issues denominated in currencies of emerging market countries, investment companies (like country funds) that invest in emerging market countries, depositary receipts, and similar types of investments, representing emerging market securities.
The Fund may invest up to 20% of its net assets in securities issued by other investment companies, including exchange-traded funds (“ETFs”). The Fund may also invest in money market funds, but these investments are not subject to this limitation. The Fund may invest in ETFs to participate in, or gain exposure to, certain market sectors, or when direct investments in certain countries are not permitted or available. The Fund may also invest in restricted securities, including Rule 144A securities.
Strategy Portfolio Concentration [Text] rr_StrategyPortfolioConcentration Under normal conditions, the Fund invests at least 80% of its net assets in securities of companies that are organized in, maintain at least 50% of their assets in, or derive at least 50% of their revenues from, emerging market countries.
Risk [Heading] rr_RiskHeading PRINCIPAL RISKS
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading PERFORMANCE
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock
The following chart and table provide some indication of the risks of investing in the Fund by showing changes in the Fund’s performance from year to year and by showing how the Fund’s average annual total 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. The annual returns in the bar chart are for the Fund’s Class A shares and do not reflect sales loads. If sales loads were reflected, returns would be lower than those shown.
Additionally, large purchases and/or redemptions of shares of a class, relative to the amount of assets represented by the class, may cause the annual returns for each class to differ. Updated performance information for the Fund is available on the VanEck website at vaneck.com.
Performance Information Illustrates Variability of Returns [Text] rr_PerformanceInformationIllustratesVariabilityOfReturns The following chart and table provide some indication of the risks of investing in the Fund by showing changes in the Fund’s performance from year to year and by showing how the Fund’s average annual total returns compare with those of a broad measure of market performance.
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress vaneck.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 CLASS A: Annual Total Returns (%) as of 12/31
Bar Chart Does Not Reflect Sales Loads [Text] rr_BarChartDoesNotReflectSalesLoads The annual returns in the bar chart are for the Fund’s Class A shares and do not reflect sales loads. If sales loads were reflected, returns would be lower than those shown.
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock
Best Quarter:+25.07%2Q 2020
Worst Quarter:-25.90%1Q 2020
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Best Quarter:
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Jun. 30, 2020
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 25.07%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Worst Quarter:
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Mar. 31, 2020
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (25.90%)
Performance Table Heading rr_PerformanceTableHeading Average Annual Total Returns as of 12/31/2023
Performance Table Uses Highest Federal Rate rr_PerformanceTableUsesHighestFederalRate After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes.
Performance Table Not Relevant to Tax Deferred rr_PerformanceTableNotRelevantToTaxDeferred The after-tax return information shown above does not apply to Fund shares held through a tax-advantaged account, such as a 401(k) plan or Investment Retirement Account.
Performance Table One Class of after Tax Shown [Text] rr_PerformanceTableOneClassOfAfterTaxShown These returns are shown for one class of shares only; after-tax returns for the other classes may vary.
Performance Table Closing [Text Block] rr_PerformanceTableClosingTextBlock
See “License Agreements and Disclaimers” for important information.
Emerging Markets Fund | MSCI Emerging Markets Investable Markets Index (reflects no deduction for fees, expenses or taxes except withholding taxes)  
Prospectus [Line Items] rr_ProspectusLineItems  
Label rr_AverageAnnualReturnLabel MSCI Emerging Markets Investable Markets Index (reflects no deduction for fees, expenses or taxes, except withholding taxes)
1 Year rr_AverageAnnualReturnYear01 11.67%
5 Years rr_AverageAnnualReturnYear05 4.46%
10 Years rr_AverageAnnualReturnYear10 3.00%
Emerging Markets Fund | Risk Lose Money [Member]  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock The Fund’s share price and return will fluctuate with changes in the market value of the Fund’s portfolio securities. Accordingly, an investment in the Fund involves the risk of losing money.
Emerging Markets Fund | Active Management Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Active Management Risk.  In managing the Fund’s portfolio, the Adviser will apply investment techniques and risk analyses in making investment decisions for the Fund, but there can be no guarantee that these will produce the desired results. Investment decisions made by the Adviser in seeking to achieve the Fund’s investment objective may cause a decline in the value of the investments held by the Fund and, in turn, cause the Fund’s shares to lose value or underperform other funds with similar investment objectives.
Emerging Markets Fund | Consumer Discretionary Sector Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Consumer Discretionary Sector Risk. The Fund may be sensitive to, and its performance may depend to a greater extent on, the overall condition of the consumer discretionary sector. The consumer discretionary sector comprises companies whose businesses are sensitive to economic cycles, such as manufacturers of high-end apparel and automobile and leisure companies. Companies in the consumer discretionary sector are subject to fluctuations in supply and demand. These companies may also be adversely affected by changes in consumer spending as a result of world events, political and economic conditions, commodity price volatility, changes in exchange rates, imposition of import controls, increased competition, depletion of resources and labor relations.
Emerging Markets Fund | Direct Investments Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Direct Investments Risk. Direct investments may involve a high degree of business and financial risk that can result in substantial losses. Because of the absence of any public trading market for these investments, the Fund may take longer to
liquidate these positions than would be the case for publicly traded securities. Direct investments are generally considered illiquid and will be aggregated with other illiquid investments for purposes of the Fund's limitation on illiquid investments.
Emerging Markets Fund | Emerging Market Issuers Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Emerging Market Issuers Risk. Investments in securities of emerging market issuers involve risks not typically associated with investments in securities of issuers in more developed countries that may negatively affect the value of your investment in the Fund. Such heightened risks may include, among others, expropriation and/or nationalization of assets, restrictions on and government intervention in international trade, confiscatory taxation, political instability, including authoritarian and/or military involvement in governmental decision making, armed conflict, the impact on the economy as a result of civil war, crime (including drug violence) and social instability as a result of religious, ethnic and/or socioeconomic unrest. Issuers in certain emerging market countries are subject to less stringent requirements regarding accounting, auditing, financial reporting and record keeping than are issuers in more developed markets, and therefore, all material information may not be available or reliable. Emerging markets are also more likely than developed markets to experience problems with the clearing and settling of trades, as well as the holding of securities by local banks, agents and depositories. Low trading volumes and volatile prices in less developed markets may make trades harder to complete and settle, and governments or trade groups may compel local agents to hold securities in designated depositories that may not be subject to independent evaluation. Local agents are held only to the standards of care of their local markets. In general, the less developed a country’s securities markets are, the greater the likelihood of custody problems. Additionally, each of the factors described below could have a negative impact on the Fund’s performance and increase the volatility of the Fund.
Securities Markets. Securities markets in emerging market countries are underdeveloped and are often considered to be less correlated to global economic cycles than those markets located in more developed countries. Securities markets in emerging market countries are subject to greater risks associated with market volatility, lower market capitalization, lower trading volume, illiquidity, inflation, greater price fluctuations, uncertainty regarding the existence of trading markets, governmental control and heavy regulation of labor and industry. These factors, coupled with restrictions on foreign investment and other factors, limit the supply of securities available for investment by the Fund. This will affect the rate at which the Fund is able to invest in emerging market countries, the purchase and sale prices for such securities and the timing of purchases and sales. Emerging markets can experience high rates of inflation, deflation and currency devaluation. The prices of certain securities listed on securities markets in emerging market countries have been subject to sharp fluctuations and sudden declines, and no assurance can be given as to the future performance of listed securities in general. Volatility of prices may be greater than in more developed securities markets. Moreover, securities markets in emerging market countries may be closed for extended periods of time or trading on securities markets may be suspended altogether due to political or civil unrest. Market volatility may also be heightened by the actions of a small number of investors. Brokerage firms in emerging market countries may be fewer in number and less established than brokerage firms in more developed markets. Since the Fund may need to effect securities transactions through these brokerage firms, the Fund is subject to the risk that these brokerage firms will not be able to fulfill their obligations to the Fund. This risk is magnified to the extent the Fund effects securities transactions through a single brokerage firm or a small number of brokerage firms. In addition, the infrastructure for the safe custody of securities and for purchasing and selling securities, settling trades, collecting dividends, initiating corporate actions, and following corporate activity is not as well developed in emerging market countries as is the case in certain more developed markets.
Political and Economic Risk. Certain emerging market countries have historically been subject to political instability and their prospects are tied to the continuation of economic and political liberalization in the region. Instability may result from factors such as government or military intervention in decision making, terrorism, civil unrest, extremism or hostilities between neighboring countries. Any of these factors, including an outbreak of hostilities could negatively impact the Fund’s returns. Limited political and democratic freedoms in emerging market countries might cause significant social unrest. These factors may have a significant adverse effect on an emerging market country’s economy.
Many emerging market countries may be heavily dependent upon international trade and, consequently, may continue to be negatively affected by trade barriers, exchange controls, managed adjustments in relative currency values and other protectionist measures imposed or negotiated by the countries with which it trades. They also have been, and may continue to be, adversely affected by economic conditions in the countries with which they trade.
In addition, commodities (such as oil, gas and minerals) represent a significant percentage of certain emerging market countries’ exports and these economies are particularly sensitive to fluctuations in commodity prices. Adverse economic events in one country may have a significant adverse effect on other countries of this region. In addition, most emerging market countries have experienced, at one time or another, severe and persistent levels of inflation, including, in some cases, hyperinflation. This has, in turn, led to high interest rates, extreme measures by governments to keep inflation in check, and a generally debilitating effect on economic growth.
Although inflation in many countries has lessened, there is no guarantee it will remain at lower levels. The political history of certain emerging market countries has been characterized by political uncertainty, intervention by the military in civilian and economic spheres, and political corruption. Such events could reverse favorable trends toward market and
economic reform, privatization, and removal of trade barriers, and result in significant disruption in securities markets in the region.
Also, from time to time, certain issuers located in emerging market countries in which the Fund invests may operate in, or have dealings with, countries subject to sanctions and/or embargoes imposed by the U.S. Government and the United Nations and/or countries identified by the U.S. Government as state sponsors of terrorism. As a result, an issuer may sustain damage to its reputation if it is identified as an issuer which operates in, or has dealings with, such countries. The Fund, as an investor in such issuers, will be indirectly subject to those risks.
The economies of one or more countries in which the Fund may invest may be in various states of transition from a planned economy to a more market oriented economy. The economies of such countries differ from the economies of most developed countries in many respects, including levels of government involvement, states of development, growth rates, control of foreign exchange and allocation of resources. Economic growth in these economies may be uneven both geographically and among various sectors of their economies and may also be accompanied by periods of high inflation. Political changes, social instability and adverse diplomatic developments in these countries could result in the imposition of additional government restrictions, including expropriation of assets, confiscatory taxes or nationalization of some or all of the property held by the underlying issuers of securities of emerging market issuers. There is no guarantee that the governments of these countries will not revert back to some form of planned or non-market oriented economy, and such governments continue to be active participants in many economic sectors through ownership positions and regulation. The allocation of resources in such countries is subject to a high level of government control. Such countries’ governments may strictly regulate the payment of foreign currency denominated obligations and set monetary policy. Through their policies, these governments may provide preferential treatment to particular industries or companies. The policies set by the government of one of these countries could have a substantial effect on that country’s economy.
Investment and Repatriation Restrictions. The government in an emerging market country may restrict or control to varying degrees the ability of foreign investors to invest in securities of issuers located or operating in such emerging market countries. These restrictions and/or controls may at times limit or prevent foreign investment in securities of issuers located or operating in emerging market countries and may inhibit the Fund’s ability to meet its investment objective. In addition, the Fund may not be able to buy or sell securities or receive full value for such securities. Moreover, certain emerging market countries may require governmental approval or special licenses prior to investments by foreign investors and may limit the amount of investments by foreign investors in a particular industry and/or issuer; may limit such foreign investment to a certain class of securities of an issuer that may have less advantageous rights than the classes available for purchase by domiciliaries of such emerging market countries; and/or may impose additional taxes on foreign investors. A delay in obtaining a required government approval or a license would delay investments in those emerging market countries, and, as a result, the Fund may not be able to invest in certain securities while approval is pending. The government of certain emerging market countries may also withdraw or decline to renew a license that enables the Fund to invest in such country. These factors make investing in issuers located or operating in emerging market countries significantly riskier than investing in issuers located or operating in more developed countries, and any one of them could cause a decline in the net asset value of the Fund.
Additionally, investments in issuers located in certain emerging market countries may be subject to a greater degree of risk associated with governmental approval in connection with the repatriation of investment income, capital or the proceeds of sales of securities by foreign investors. Moreover, there is the risk that if the balance of payments in an emerging market country declines, the government of such country may impose temporary restrictions on foreign capital remittances. Consequently, the Fund could be adversely affected by delays in, or a refusal to grant, required governmental approval for repatriation of capital, as well as by the application to the Fund of any restrictions on investments. Furthermore, investments in emerging market countries may require the Fund to adopt special procedures, seek local government approvals or take other actions, each of which may involve additional costs to the Fund.
Available Disclosure About Emerging Market Issuers. Issuers located or operating in emerging market countries are not subject to the same rules and regulations as issuers located or operating in more developed countries. Therefore, there may be less financial and other information publicly available with regard to issuers located or operating in emerging market countries and such issuers are not subject to the uniform accounting, auditing and financial reporting standards applicable to issuers located or operating in more developed countries.
Foreign Currency Considerations. The Fund’s assets that are invested in securities of issuers in emerging market countries will generally be denominated in foreign currencies, and the proceeds received by the Fund from these investments will be principally in foreign currencies. The value of an emerging market country’s currency may be subject to a high degree of fluctuation. This fluctuation may be due to changes in interest rates, the effects of monetary policies issued by the United States, foreign governments, central banks or supranational entities, the imposition of currency controls or other national or global political or economic developments. The economies of certain emerging market countries can be significantly affected by currency devaluations. Certain emerging market countries may also have managed currencies which are maintained at artificial levels relative to the U.S. dollar rather than at levels determined by
the market. This type of system can lead to sudden and large adjustments in the currency which, in turn, can have a disruptive and negative effect on foreign investors.
The Fund’s exposure to an emerging market country’s currency and changes in value of such foreign currencies versus the U.S. dollar may reduce the Fund’s investment performance and the value of your investment in the Fund. Meanwhile, the Fund will compute and expects to distribute its income in U.S. dollars, and the computation of income will be made on the date that the income is earned by the Fund at the foreign exchange rate in effect on that date. Therefore, if the value of the respective emerging market country’s currency falls relative to the U.S. dollar between the earning of the income and the time at which the Fund converts the relevant emerging market country’s currency to U.S. dollars, the Fund may be required to liquidate certain positions in order to make distributions if the Fund has insufficient cash in U.S. dollars to meet distribution requirements under the Internal Revenue Code. The liquidation of investments, if required, could be at disadvantageous prices or otherwise have an adverse impact on the Fund’s performance.
Certain emerging market countries also restrict the free conversion of their currency into foreign currencies, including the U.S. dollar. There is no significant foreign exchange market for many such currencies and it would, as a result, be difficult for the Fund to engage in foreign currency transactions designed to protect the value of the Fund’s interests in securities denominated in such currencies. Furthermore, if permitted, the Fund may incur costs in connection with conversions between U.S. dollars and an emerging market country’s currency. Foreign exchange dealers realize a profit based on the difference between the prices at which they are buying and selling various currencies. Thus, a dealer normally will offer to sell a foreign currency to the Fund at one rate, while offering a lesser rate of exchange should the Fund desire immediately to resell that currency to the dealer. The Fund will conduct its foreign currency exchange transactions either on a spot (i.e., cash) basis at the spot rate prevailing in the foreign currency exchange market, or through entering into forward, futures or options contracts to purchase or sell foreign currencies.
Operational and Settlement Risk. In addition to having less developed securities markets, emerging market countries have less developed custody and settlement practices than certain developed countries. Rules adopted under the Investment Company Act of 1940 permit the Fund to maintain its foreign securities and cash in the custody of certain eligible non-U.S. banks and securities depositories. Banks in emerging market countries that are eligible foreign sub-custodians may be recently organized or otherwise lack extensive operating experience. In addition, in certain emerging market countries there may be legal restrictions or limitations on the ability of the Fund to recover assets held in custody by a foreign sub-custodian in the event of the bankruptcy of the sub-custodian. Because settlement systems in emerging market countries may be less organized than in other developed markets, there may be a risk that settlement may be delayed and that cash or securities of the Fund may be in jeopardy because of failures of or defects in the systems. Under the laws in many emerging market countries, the Fund may be required to release local shares before receiving cash payment or may be required to make cash payment prior to receiving local shares, creating a risk that the Fund may surrender cash or securities without ever receiving securities or cash from the other party. Settlement systems in emerging market countries also have a higher risk of failed trades and back to back settlements may not be possible.
The Fund may not be able to convert a foreign currency to U.S. dollars in time for the settlement of redemption requests. In the event that the Fund is not able to convert the foreign currency to U.S. dollars in time for settlement, which may occur as a result of the delays described above, the Fund may be required to liquidate certain investments and/or borrow money in order to fund such redemption. The liquidation of investments, if required, could be at disadvantageous prices or otherwise have an adverse impact on the Fund’s performance (e.g., by causing the Fund to overweight foreign currency denominated holdings and underweight other holdings which were sold to fund redemptions). In addition, the Fund will incur interest expense on any borrowings and the borrowings will cause the Fund to be leveraged, which may magnify gains and losses on its investments.
In certain emerging market countries, the marketability of investments may be limited due to the restricted opening hours of trading exchanges, and a relatively high proportion of market value may be concentrated in the hands of a relatively small number of investors. In addition, because certain emerging market countries’ trading exchanges on which the Fund’s portfolio securities may trade are open when the relevant exchanges are closed, the Fund may be subject to heightened risk associated with market movements. Trading volume may be lower on certain emerging market countries’ trading exchanges than on more developed securities markets and securities may be generally less liquid. The infrastructure for clearing, settlement and registration on the primary and secondary markets of certain emerging market countries are less developed than in certain other markets and under certain circumstances this may result in the Fund experiencing delays in settling and/or registering transactions in the markets in which it invests, particularly if the growth of foreign and domestic investment in certain emerging market countries places an undue burden on such investment infrastructure. Such delays could affect the speed with which the Fund can transmit redemption proceeds and may inhibit the initiation and realization of investment opportunities at optimum times.
Certain issuers in emerging market countries may utilize share blocking schemes. Share blocking refers to a practice, in certain foreign markets, where voting rights related to an issuer’s securities are predicated on these securities being blocked from trading at the custodian or sub-custodian level for a period of time around a shareholder meeting. These
restrictions have the effect of barring the purchase and sale of certain voting securities within a specified number of days before and, in certain instances, after a shareholder meeting where a vote of shareholders will be taken. Share blocking may prevent the Fund from buying or selling securities for a period of time. During the time that shares are blocked, trades in such securities will not settle. The blocking period can last up to several weeks. The process for having a blocking restriction lifted can be quite onerous with the particular requirements varying widely by country. In addition, in certain countries, the block cannot be removed. As a result of the ramifications of voting ballots in markets that allow share blocking, the Adviser, on behalf of the Fund, reserves the right to abstain from voting proxies in those markets.
Corporate and Securities Laws. Securities laws in emerging market countries are relatively new and unsettled and, consequently, there is a risk of rapid and unpredictable change in laws regarding foreign investment, securities regulation, title to securities and securityholders rights. Accordingly, foreign investors may be adversely affected by new or amended laws and regulations. In addition, the systems of corporate governance to which emerging market issuers are subject may be less advanced than those systems to which issuers located in more developed countries are subject, and therefore, securityholders of issuers located in emerging market countries may not receive many of the protections available to securityholders of issuers located in more developed countries. In circumstances where adequate laws and securityholders rights exist, it may not be possible to obtain swift and equitable enforcement of the law. In addition, the enforcement of systems of taxation at federal, regional and local levels in emerging market countries may be inconsistent and subject to sudden change. The Fund has limited rights and few practical remedies in emerging markets and the ability of U.S. authorities to bring enforcement actions in emerging markets may be limited.
Emerging Markets Fund | Emerging Market Issuers Risk, Securities Markets Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Securities Markets. Securities markets in emerging market countries are underdeveloped and are often considered to be less correlated to global economic cycles than those markets located in more developed countries. Securities markets in emerging market countries are subject to greater risks associated with market volatility, lower market capitalization, lower trading volume, illiquidity, inflation, greater price fluctuations, uncertainty regarding the existence of trading markets, governmental control and heavy regulation of labor and industry. These factors, coupled with restrictions on foreign investment and other factors, limit the supply of securities available for investment by the Fund. This will affect the rate at which the Fund is able to invest in emerging market countries, the purchase and sale prices for such securities and the timing of purchases and sales. Emerging markets can experience high rates of inflation, deflation and currency devaluation. The prices of certain securities listed on securities markets in emerging market countries have been subject to sharp fluctuations and sudden declines, and no assurance can be given as to the future performance of listed securities in general. Volatility of prices may be greater than in more developed securities markets. Moreover, securities markets in emerging market countries may be closed for extended periods of time or trading on securities markets may be suspended altogether due to political or civil unrest. Market volatility may also be heightened by the actions of a small number of investors. Brokerage firms in emerging market countries may be fewer in number and less established than brokerage firms in more developed markets. Since the Fund may need to effect securities transactions through these brokerage firms, the Fund is subject to the risk that these brokerage firms will not be able to fulfill their obligations to the Fund. This risk is magnified to the extent the Fund effects securities transactions through a single brokerage firm or a small number of brokerage firms. In addition, the infrastructure for the safe custody of securities and for purchasing and selling securities, settling trades, collecting dividends, initiating corporate actions, and following corporate activity is not as well developed in emerging market countries as is the case in certain more developed markets.
Emerging Markets Fund | Emerging Market Issuers Risk, Political And Economic Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Political and Economic Risk. Certain emerging market countries have historically been subject to political instability and their prospects are tied to the continuation of economic and political liberalization in the region. Instability may result from factors such as government or military intervention in decision making, terrorism, civil unrest, extremism or hostilities between neighboring countries. Any of these factors, including an outbreak of hostilities could negatively impact the Fund’s returns. Limited political and democratic freedoms in emerging market countries might cause significant social unrest. These factors may have a significant adverse effect on an emerging market country’s economy.
Many emerging market countries may be heavily dependent upon international trade and, consequently, may continue to be negatively affected by trade barriers, exchange controls, managed adjustments in relative currency values and other protectionist measures imposed or negotiated by the countries with which it trades. They also have been, and may continue to be, adversely affected by economic conditions in the countries with which they trade.
In addition, commodities (such as oil, gas and minerals) represent a significant percentage of certain emerging market countries’ exports and these economies are particularly sensitive to fluctuations in commodity prices. Adverse economic events in one country may have a significant adverse effect on other countries of this region. In addition, most emerging market countries have experienced, at one time or another, severe and persistent levels of inflation, including, in some cases, hyperinflation. This has, in turn, led to high interest rates, extreme measures by governments to keep inflation in check, and a generally debilitating effect on economic growth.
Although inflation in many countries has lessened, there is no guarantee it will remain at lower levels. The political history of certain emerging market countries has been characterized by political uncertainty, intervention by the military in civilian and economic spheres, and political corruption. Such events could reverse favorable trends toward market and
economic reform, privatization, and removal of trade barriers, and result in significant disruption in securities markets in the region.
Also, from time to time, certain issuers located in emerging market countries in which the Fund invests may operate in, or have dealings with, countries subject to sanctions and/or embargoes imposed by the U.S. Government and the United Nations and/or countries identified by the U.S. Government as state sponsors of terrorism. As a result, an issuer may sustain damage to its reputation if it is identified as an issuer which operates in, or has dealings with, such countries. The Fund, as an investor in such issuers, will be indirectly subject to those risks.
The economies of one or more countries in which the Fund may invest may be in various states of transition from a planned economy to a more market oriented economy. The economies of such countries differ from the economies of most developed countries in many respects, including levels of government involvement, states of development, growth rates, control of foreign exchange and allocation of resources. Economic growth in these economies may be uneven both geographically and among various sectors of their economies and may also be accompanied by periods of high inflation. Political changes, social instability and adverse diplomatic developments in these countries could result in the imposition of additional government restrictions, including expropriation of assets, confiscatory taxes or nationalization of some or all of the property held by the underlying issuers of securities of emerging market issuers. There is no guarantee that the governments of these countries will not revert back to some form of planned or non-market oriented economy, and such governments continue to be active participants in many economic sectors through ownership positions and regulation. The allocation of resources in such countries is subject to a high level of government control. Such countries’ governments may strictly regulate the payment of foreign currency denominated obligations and set monetary policy. Through their policies, these governments may provide preferential treatment to particular industries or companies. The policies set by the government of one of these countries could have a substantial effect on that country’s economy.
Emerging Markets Fund | Emerging Market Issuers Risk, Investment And Repatriation Restrictions Member  
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Investment and Repatriation Restrictions. The government in an emerging market country may restrict or control to varying degrees the ability of foreign investors to invest in securities of issuers located or operating in such emerging market countries. These restrictions and/or controls may at times limit or prevent foreign investment in securities of issuers located or operating in emerging market countries and may inhibit the Fund’s ability to meet its investment objective. In addition, the Fund may not be able to buy or sell securities or receive full value for such securities. Moreover, certain emerging market countries may require governmental approval or special licenses prior to investments by foreign investors and may limit the amount of investments by foreign investors in a particular industry and/or issuer; may limit such foreign investment to a certain class of securities of an issuer that may have less advantageous rights than the classes available for purchase by domiciliaries of such emerging market countries; and/or may impose additional taxes on foreign investors. A delay in obtaining a required government approval or a license would delay investments in those emerging market countries, and, as a result, the Fund may not be able to invest in certain securities while approval is pending. The government of certain emerging market countries may also withdraw or decline to renew a license that enables the Fund to invest in such country. These factors make investing in issuers located or operating in emerging market countries significantly riskier than investing in issuers located or operating in more developed countries, and any one of them could cause a decline in the net asset value of the Fund.
Additionally, investments in issuers located in certain emerging market countries may be subject to a greater degree of risk associated with governmental approval in connection with the repatriation of investment income, capital or the proceeds of sales of securities by foreign investors. Moreover, there is the risk that if the balance of payments in an emerging market country declines, the government of such country may impose temporary restrictions on foreign capital remittances. Consequently, the Fund could be adversely affected by delays in, or a refusal to grant, required governmental approval for repatriation of capital, as well as by the application to the Fund of any restrictions on investments. Furthermore, investments in emerging market countries may require the Fund to adopt special procedures, seek local government approvals or take other actions, each of which may involve additional costs to the Fund.
Emerging Markets Fund | Emerging Market Issuers Risk, Available Disclosure About Emerging Market Issuers Member  
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Available Disclosure About Emerging Market Issuers. Issuers located or operating in emerging market countries are not subject to the same rules and regulations as issuers located or operating in more developed countries. Therefore, there may be less financial and other information publicly available with regard to issuers located or operating in emerging market countries and such issuers are not subject to the uniform accounting, auditing and financial reporting standards applicable to issuers located or operating in more developed countries.
Emerging Markets Fund | Emerging Market Issuers Risk, Foreign Currency Considerations Member  
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Foreign Currency Considerations. The Fund’s assets that are invested in securities of issuers in emerging market countries will generally be denominated in foreign currencies, and the proceeds received by the Fund from these investments will be principally in foreign currencies. The value of an emerging market country’s currency may be subject to a high degree of fluctuation. This fluctuation may be due to changes in interest rates, the effects of monetary policies issued by the United States, foreign governments, central banks or supranational entities, the imposition of currency controls or other national or global political or economic developments. The economies of certain emerging market countries can be significantly affected by currency devaluations. Certain emerging market countries may also have managed currencies which are maintained at artificial levels relative to the U.S. dollar rather than at levels determined by
the market. This type of system can lead to sudden and large adjustments in the currency which, in turn, can have a disruptive and negative effect on foreign investors.
The Fund’s exposure to an emerging market country’s currency and changes in value of such foreign currencies versus the U.S. dollar may reduce the Fund’s investment performance and the value of your investment in the Fund. Meanwhile, the Fund will compute and expects to distribute its income in U.S. dollars, and the computation of income will be made on the date that the income is earned by the Fund at the foreign exchange rate in effect on that date. Therefore, if the value of the respective emerging market country’s currency falls relative to the U.S. dollar between the earning of the income and the time at which the Fund converts the relevant emerging market country’s currency to U.S. dollars, the Fund may be required to liquidate certain positions in order to make distributions if the Fund has insufficient cash in U.S. dollars to meet distribution requirements under the Internal Revenue Code. The liquidation of investments, if required, could be at disadvantageous prices or otherwise have an adverse impact on the Fund’s performance.
Certain emerging market countries also restrict the free conversion of their currency into foreign currencies, including the U.S. dollar. There is no significant foreign exchange market for many such currencies and it would, as a result, be difficult for the Fund to engage in foreign currency transactions designed to protect the value of the Fund’s interests in securities denominated in such currencies. Furthermore, if permitted, the Fund may incur costs in connection with conversions between U.S. dollars and an emerging market country’s currency. Foreign exchange dealers realize a profit based on the difference between the prices at which they are buying and selling various currencies. Thus, a dealer normally will offer to sell a foreign currency to the Fund at one rate, while offering a lesser rate of exchange should the Fund desire immediately to resell that currency to the dealer. The Fund will conduct its foreign currency exchange transactions either on a spot (i.e., cash) basis at the spot rate prevailing in the foreign currency exchange market, or through entering into forward, futures or options contracts to purchase or sell foreign currencies.
Emerging Markets Fund | Emerging Market Issuers Risk, Operational And Settlement Risk Member  
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Operational and Settlement Risk. In addition to having less developed securities markets, emerging market countries have less developed custody and settlement practices than certain developed countries. Rules adopted under the Investment Company Act of 1940 permit the Fund to maintain its foreign securities and cash in the custody of certain eligible non-U.S. banks and securities depositories. Banks in emerging market countries that are eligible foreign sub-custodians may be recently organized or otherwise lack extensive operating experience. In addition, in certain emerging market countries there may be legal restrictions or limitations on the ability of the Fund to recover assets held in custody by a foreign sub-custodian in the event of the bankruptcy of the sub-custodian. Because settlement systems in emerging market countries may be less organized than in other developed markets, there may be a risk that settlement may be delayed and that cash or securities of the Fund may be in jeopardy because of failures of or defects in the systems. Under the laws in many emerging market countries, the Fund may be required to release local shares before receiving cash payment or may be required to make cash payment prior to receiving local shares, creating a risk that the Fund may surrender cash or securities without ever receiving securities or cash from the other party. Settlement systems in emerging market countries also have a higher risk of failed trades and back to back settlements may not be possible.
The Fund may not be able to convert a foreign currency to U.S. dollars in time for the settlement of redemption requests. In the event that the Fund is not able to convert the foreign currency to U.S. dollars in time for settlement, which may occur as a result of the delays described above, the Fund may be required to liquidate certain investments and/or borrow money in order to fund such redemption. The liquidation of investments, if required, could be at disadvantageous prices or otherwise have an adverse impact on the Fund’s performance (e.g., by causing the Fund to overweight foreign currency denominated holdings and underweight other holdings which were sold to fund redemptions). In addition, the Fund will incur interest expense on any borrowings and the borrowings will cause the Fund to be leveraged, which may magnify gains and losses on its investments.
In certain emerging market countries, the marketability of investments may be limited due to the restricted opening hours of trading exchanges, and a relatively high proportion of market value may be concentrated in the hands of a relatively small number of investors. In addition, because certain emerging market countries’ trading exchanges on which the Fund’s portfolio securities may trade are open when the relevant exchanges are closed, the Fund may be subject to heightened risk associated with market movements. Trading volume may be lower on certain emerging market countries’ trading exchanges than on more developed securities markets and securities may be generally less liquid. The infrastructure for clearing, settlement and registration on the primary and secondary markets of certain emerging market countries are less developed than in certain other markets and under certain circumstances this may result in the Fund experiencing delays in settling and/or registering transactions in the markets in which it invests, particularly if the growth of foreign and domestic investment in certain emerging market countries places an undue burden on such investment infrastructure. Such delays could affect the speed with which the Fund can transmit redemption proceeds and may inhibit the initiation and realization of investment opportunities at optimum times.
Certain issuers in emerging market countries may utilize share blocking schemes. Share blocking refers to a practice, in certain foreign markets, where voting rights related to an issuer’s securities are predicated on these securities being blocked from trading at the custodian or sub-custodian level for a period of time around a shareholder meeting. These
restrictions have the effect of barring the purchase and sale of certain voting securities within a specified number of days before and, in certain instances, after a shareholder meeting where a vote of shareholders will be taken. Share blocking may prevent the Fund from buying or selling securities for a period of time. During the time that shares are blocked, trades in such securities will not settle. The blocking period can last up to several weeks. The process for having a blocking restriction lifted can be quite onerous with the particular requirements varying widely by country. In addition, in certain countries, the block cannot be removed. As a result of the ramifications of voting ballots in markets that allow share blocking, the Adviser, on behalf of the Fund, reserves the right to abstain from voting proxies in those markets.
Emerging Markets Fund | Emerging Market Issuers Risk, Corporate And Securities Laws Member  
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Corporate and Securities Laws. Securities laws in emerging market countries are relatively new and unsettled and, consequently, there is a risk of rapid and unpredictable change in laws regarding foreign investment, securities regulation, title to securities and securityholders rights. Accordingly, foreign investors may be adversely affected by new or amended laws and regulations. In addition, the systems of corporate governance to which emerging market issuers are subject may be less advanced than those systems to which issuers located in more developed countries are subject, and therefore, securityholders of issuers located in emerging market countries may not receive many of the protections available to securityholders of issuers located in more developed countries. In circumstances where adequate laws and securityholders rights exist, it may not be possible to obtain swift and equitable enforcement of the law. In addition, the enforcement of systems of taxation at federal, regional and local levels in emerging market countries may be inconsistent and subject to sudden change. The Fund has limited rights and few practical remedies in emerging markets and the ability of U.S. authorities to bring enforcement actions in emerging markets may be limited.
Emerging Markets Fund | ESG Investing Strategy Risk Member  
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ESG Investing Strategy Risk. The Fund’s ESG strategy could cause it to perform differently compared to funds that do not have an ESG focus. The Fund’s ESG strategy may result in the Fund investing in securities or industry sectors that underperform other securities or underperform the market as a whole. The Fund is also subject to the risk that the companies represented in the Fund do not operate as expected when addressing ESG issues. Additionally, the valuation model used for identifying ESG companies may not perform as intended, which may adversely affect an investment in the Fund. Regulatory changes or interpretations regarding the definitions and/or use of ESG criteria could have a material adverse effect on the Fund’s ability to implement its ESG strategy.
Emerging Markets Fund | Financials Sector Risk Member  
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Financials Sector Risk. The Fund may be sensitive to, and its performance may depend to a greater extent on, the overall condition of the financials sector. Companies in the financials sector may be subject to extensive government regulation that affects the scope of their activities, the prices they can charge and the amount of capital they must maintain. The profitability of companies in the financials sector may be adversely affected by increases in interest rates, by loan losses, which usually increase in economic downturns, and by credit rating downgrades. In addition, the financials sector is undergoing numerous changes, including continuing consolidations, development of new products and structures and changes to its regulatory framework. Furthermore, some companies in the financials sector perceived as benefiting from government intervention in the past may be subject to future government-imposed restrictions on their businesses or face increased government involvement in their operations. Increased government involvement in the financials sector, including measures such as taking ownership positions in financial institutions, could result in a dilution of the Fund’s investments in financial institutions.
Emerging Markets Fund | Foreign Currency Risk Member  
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Foreign Currency Risk. Because all or a portion of the income received by the Fund from its investments and/or the revenues received by the underlying issuer will generally be denominated in foreign currencies, the Fund’s exposure to foreign currencies and changes in the value of foreign currencies versus the U.S. dollar may result in reduced returns for the Fund, and the value of certain foreign currencies may be subject to a high degree of fluctuation. The Fund may also (directly or indirectly) incur costs in connection with conversions between U.S. dollars and foreign currencies.
Emerging Markets Fund | Foreign Securities Risk Member  
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Risk [Text Block] rr_RiskTextBlock Foreign Securities Risk. Investments in the securities of foreign issuers involve risks beyond those associated with investments in U.S. securities. These additional risks include greater market volatility, the availability of less reliable financial information, higher transactional and custody costs, taxation by foreign governments, decreased market liquidity and political instability. Because certain foreign securities markets may be limited in size, the activity of large traders may have an undue influence on the prices of securities that trade in such markets. The Fund invests in securities of issuers located in countries whose economies are heavily dependent upon trading with key partners. Any reduction in this trading may have an adverse impact on the Fund’s investments. Foreign market trading hours, clearance and settlement procedures, and holiday schedules may limit the Fund's ability to buy and sell securities.
Emerging Markets Fund | Industrials Sector Risk Member  
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Industrials Sector Risk. The Fund may be sensitive to, and its performance may depend to a greater extent on, the overall condition of the industrials sector. The industrials sector comprises companies who produce capital goods used in construction and manufacturing, such as companies that make and sell machinery, equipment and supplies that are used to produce other goods. Companies in the industrials sector may be adversely affected by changes in government regulation, world events and economic conditions. In addition, companies in the industrials sector may be adversely affected by environmental damages, product liability claims and exchange rates.
Emerging Markets Fund | Information Technology Sector Risk Meber  
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Information Technology Sector Risk. The Fund may be sensitive to, and its performance may depend to a greater extent on, the overall condition of the information technology sector. Information technology companies face intense competition, both domestically and internationally, which may have an adverse effect on profit margins. Information technology companies may have
limited product lines, markets, financial resources or personnel. The products of information technology companies may face product obsolescence due to rapid technological developments and frequent new product introduction, unpredictable changes in growth rates and competition for the services of qualified personnel. Companies in the information technology sector are heavily dependent on patent protection and the expiration of patents may adversely affect the profitability of these companies.
Emerging Markets Fund | Market Risk Member  
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Market Risk. The prices of securities are subject to the risks associated with investing in the securities market, including general economic conditions, sudden and unpredictable drops in value, exchange trading suspensions and closures and public health risks. These risks may be magnified if certain social, political, economic and other conditions and events (such as natural disasters, epidemics and pandemics, terrorism, conflicts and social unrest) adversely interrupt the global economy; in these and other circumstances, such events or developments might affect companies world-wide. Overall securities values could decline generally or underperform other investments. An investment may lose money.
Emerging Markets Fund | Operational Risk Member  
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Operational Risk. The Fund is exposed to operational risk arising from a number of factors, including human error, processing and communication errors, errors of the Fund’s service providers, counterparties or other third-parties, failed or inadequate processes and technology or system failures.
Emerging Markets Fund | Restricted Securities Risk Member  
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Restricted Securities Risk. The Fund may hold securities that are restricted as to resale under the U.S. Federal securities laws, such as securities in certain privately held companies. Such securities may be highly illiquid and their values may experience significant volatility. Restricted securities may be difficult to value.
Emerging Markets Fund | Risk Of Investing In Other Funds Member  
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Risk of Investing in Other Funds. The Fund may invest in shares of other funds, including ETFs. As a result, the Fund will indirectly be exposed to the risks of an investment in the underlying funds. As a shareholder in a fund, the Fund would bear its ratable share of that entity’s expenses. At the same time, the Fund would continue to pay its own investment management fees and other expenses. As a result, the Fund and its shareholders will be absorbing additional levels of fees with respect to investments in other funds, including ETFs.
Emerging Markets Fund | Special Risk Considerations Of Investing In Brazilian Issuers Member  
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Special Risk Considerations of Investing in Brazilian Issuers.  Investments in securities of Brazilian issuers, including issuers located outside of Brazil that generate significant revenues from Brazil, involve risks and special considerations not typically associated with investments in the U.S. securities markets. The Brazilian economy has been characterized by frequent, and occasionally drastic, interventions by the Brazilian government, including the imposition of wage and price controls, exchange controls, limiting imports, blocking access to bank accounts and other measures. The Brazilian government has often changed monetary, taxation, credit, trade and other policies to influence the core of Brazil’s economy. Actions taken by the Brazilian government concerning the economy may have significant effects on Brazilian companies and on market conditions and prices of Brazilian securities. Brazil’s economy may be subject to sluggish economic growth due to, among other things, weak consumer spending, political turmoil, high rates of inflation and low commodity prices. Brazil suffers from chronic structural public sector deficits. The Brazilian government has privatized certain entities, which have suffered losses due to, among other things, the inability to adjust to a competitive environment.
The market for Brazilian securities is directly influenced by the flow of international capital, and economic and market conditions of certain countries, especially emerging market countries. As a result, adverse economic conditions or developments in other emerging market countries have at times significantly affected the availability of credit in the Brazilian economy and resulted in considerable outflows of funds and declines in the amount of foreign currency invested in Brazil.
Investments in Brazilian securities may be subject to certain restrictions on foreign investment. Although Brazilian law has provided greater certainty with respect to the free exchange of currency than in the past, any restrictions or restrictive exchange control policies in the future could have the effect of preventing or restricting access to foreign currency and could affect the Fund’s ability to operate and to qualify for the favorable tax treatment afforded to regulated investment companies for U.S. federal income tax purposes.
Brazil has historically experienced high rates of inflation, a high level of debt, and high crime rates, each of which may constrain economic growth. Brazil suffers from high levels of corruption, crime and income disparity. The Brazilian economy is also heavily dependent upon commodity prices and international trade. Unanticipated political or social developments may result in sudden and significant investment losses. An increase in prices for commodities, such as petroleum, the depreciation of the Brazilian real and future governmental measures seeking to maintain the value of the Brazilian real in relation to the U.S. dollar, may trigger increases in inflation in Brazil and may slow the rate of growth of the Brazilian economy. Conversely, appreciation of the Brazilian real relative to the U.S dollar may lead to the deterioration of Brazil’s current account of balance of payments as well as limit the growth of exports.
Emerging Markets Fund | Small- And Medium-Capitalization Companies Risk Member  
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Small- and Medium-Capitalization Companies Risk. The Fund may invest in small- and medium-capitalization companies and, therefore will be subject to certain risks associated with small- and medium- capitalization companies. These companies are often subject to less analyst coverage and may be in early and less predictable periods of their corporate existences, with little or no record of profitability. In addition, these companies often have greater price volatility, lower trading volume and less liquidity than larger more established companies. These companies tend to have smaller revenues, narrower product lines, less management depth and experience, smaller shares of their product or service markets, fewer financial resources and less competitive strength than large-capitalization companies. Returns on investments in securities of small- and medium-capitalization companies could trail the returns on investments in securities of larger companies.
Emerging Markets Fund | Special Purpose Acquisition Companies Risk Member  
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Risk [Text Block] rr_RiskTextBlock Special Purpose Acquisition Companies Risk. Equity securities in which the Fund invests include stock, rights, warrants, and other interests in special purpose acquisition companies (“SPACs”) or similar special purpose entities. A SPAC is typically a publicly traded company that raises investment capital via an initial public offering for the purpose of acquiring one or more existing companies (or interests therein) via merger, combination, acquisition or other similar transactions. If the Fund purchases shares of a SPAC in an initial public offering it will generally bear a sales commission, which may be significant. The shares of a SPAC are often issued in “units” that include one share of common stock and one right or warrant (or partial right or warrant) conveying the right to purchase additional shares or partial shares. In some cases, the rights and warrants may be separated from the common stock at the election of the holder, after which they may become freely tradeable. After going public and until a transaction is completed, a SPAC generally invests the proceeds of its initial public offering (less a portion retained to cover expenses) in U.S. Government securities, money market securities and cash. To the extent the SPAC is invested in cash or similar securities, this may impact the Fund’s ability to meet its investment objective. If a SPAC does not complete a transaction within a specified period of time after going public, the SPAC is typically dissolved, at which point the invested funds are returned to the SPAC’s shareholders (less certain permitted expenses) and any rights or warrants issued by the SPAC expire worthless. SPACs generally provide their investors with the option of redeeming an investment in the SPAC at or around the time of effecting a transaction. In some cases, the Fund may forfeit its right to receive additional warrants or other interests in the SPAC if it redeems its interest in the SPAC in connection with a transaction. Because SPACs often do not have an operating history or ongoing business other than seeking a transaction, the value of their securities may be particularly dependent on the quality of its management and on the ability of the SPAC’s management to identify and complete a profitable transaction. Some SPACs may pursue transactions only within certain industries or regions, which may increase the volatility of an investment in them. In addition, the securities issued by a SPAC, which may be traded in the over-the-counter market, may become illiquid and/or may be subject to restrictions on resale. Other risks of investing in SPACs include that a significant portion of the monies raised by the SPAC may be expended during the search for a target transaction; an attractive transaction may not be identified at all (or any requisite approvals may not be obtained) and the SPAC may be required to return any remaining monies to shareholders; a transaction once identified or effected may prove unsuccessful and an investment in the SPAC may lose value; the warrants or other rights with respect to the SPAC held by the Fund may expire worthless or may be repurchased or retired by the SPAC at an unfavorable price; and an investment in a SPAC may be diluted by additional later offerings of interests in the SPAC or by other investors exercising existing rights to purchase shares of the SPAC.
Emerging Markets Fund | Special Risk Considerations Of Investing In Chinese Issuers Member  
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Special Risk Considerations of Investing in Chinese Issuers. Investments in securities of Chinese issuers, including issuers outside of China that generate significant revenues from China, involve certain risks and considerations not typically associated with investments in U.S securities. These risks include among others (i) more frequent (and potentially widespread) trading suspensions and government interventions with respect to Chinese issuers resulting in a lack of liquidity and in price volatility, (ii) currency revaluations and other currency exchange rate fluctuations or blockage, (iii) the nature and extent of intervention by the Chinese government in the Chinese securities markets, whether such intervention will continue and the impact of such intervention or its discontinuation, (iv) the risk of nationalization or expropriation of assets, (v) the risk that the Chinese government may decide not to continue to support economic reform programs, (vi) limitations on the use of brokers, (vii) higher rates of inflation, (viii) greater political, economic and social uncertainty, (ix) market volatility caused by any potential regional or territorial conflicts or natural or other disasters, and (x) the risk of increased trade tariffs, embargoes, sanctions, investment restrictions and other trade limitations. Certain securities are, or may in the future become restricted, and the Fund may be forced to sell such securities and incur a loss as a result. In addition, the economy of China differs, often unfavorably, from the U.S. economy in such respects as structure, general development, government involvement, wealth distribution, rate of inflation, growth rate, interest rates, allocation of resources and capital reinvestment, among others. The Chinese central government has historically exercised substantial control over virtually every sector of the Chinese economy through administrative regulation and/or state ownership and actions of the Chinese central and local government authorities continue to have a substantial effect on economic conditions in China. In addition, the Chinese government has from time to time taken actions that influence the prices at which certain goods may be sold, encourage companies to invest or concentrate in particular industries, induce mergers between companies in certain industries and induce private companies to publicly offer their securities to increase or continue the rate of economic growth, control the rate of inflation or otherwise regulate economic expansion. The Chinese government may do so in the future as well, potentially having a significant adverse effect on economic conditions in China.
Emerging Markets Fund | Special Risk Considerations Of Investing In Indian Issuers Member  
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Special Risk Considerations of Investing in Indian Issuers. Investments in securities of Indian issuers involve risks and special considerations not typically associated with investments in the U.S. securities markets. Such heightened risks include, among others, greater government control over the economy, including the risk that the Indian government may decide not to continue to support economic reform programs, political and legal uncertainty, competition from low-cost issuers of other emerging economies in Asia, currency fluctuations or blockage of foreign currency exchanges and the risk of nationalization or expropriation of assets. Issuers in India are subject to less stringent requirements regarding accounting, auditing, financial reporting and record keeping than are issuers in more developed markets, and therefore, all material information may not be available or reliable. India is also located in a part of the world that has historically been prone to natural disasters, such as earthquakes and tsunamis. Any such natural disaster could cause a significant impact on the Indian economy and could impact
operations of the Fund, causing an adverse impact on the Fund. In addition, religious and border disputes persist in India. Moreover, India has experienced civil unrest and hostilities with neighboring countries, including Pakistan, and the Indian government has confronted separatist movements in several Indian states. India has experienced acts of terrorism that has targeted foreigners. Such acts of terrorism have had a negative impact on tourism, an important sector of the Indian economy.
The securities market of India is considered an emerging market characterized by a small number of listed companies with significantly smaller market capitalizations, greater price volatility and substantially less liquidity than developed markets, such as the United States. These factors, coupled with restrictions on foreign investment and other factors, limit the supply of securities available for investment by the Fund. This will affect the rate at which the Fund is able to invest in India, the purchase and sale prices for such securities and the timing of purchases and sales. Emerging markets can experience high rates of inflation, deflation and currency devaluation. Certain restrictions on foreign investment may decrease the liquidity of the Fund’s portfolio or inhibit the Fund’s ability to pursue its investment objective. In addition, the Reserve Bank of India, the Indian counterpart of the Federal Reserve Bank in the United States, imposes certain limits on the foreign ownership of Indian securities. These restrictions and/or controls may at times limit or prevent foreign investment in securities of issuers located or operating in India and may inhibit the Fund’s ability to pursue its investment objective.
Emerging Markets Fund | Special Risk Considerations Of Investing In Latin American Issuers Member  
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Special Risk Considerations of Investing in Latin American Issuers. Investments in securities of Latin American issuers involve special considerations not typically associated with investments in securities of issuers located in the United States. The economies of certain Latin American countries have, at times, experienced high interest rates, economic volatility, inflation, currency devaluations and high unemployment rates. In addition, commodities (such as oil, gas and minerals) represent a significant percentage of the region’s exports and many economies in this region are particularly sensitive to fluctuations in commodity prices. Adverse economic events in one country may have a significant adverse effect on other countries of this region.
Most Latin American countries have experienced severe and persistent levels of inflation, including, in some cases, hyperinflation. This has, in turn, led to high interest rates, extreme measures by governments to keep inflation in check, and a generally debilitating effect on economic growth. Although inflation in many Latin American countries has lessened, there is no guarantee it will remain at lower levels.
The political history of certain Latin American countries has been characterized by political uncertainty, intervention by the military in civilian and economic spheres, and political corruption. Such events could reverse favorable trends toward market and economic reform, privatization, and removal of trade barriers, and could result in significant disruption in securities markets in the region.
The economies of Latin American countries are generally considered emerging markets and can be significantly affected by currency devaluations. Certain Latin American countries may also have managed currencies which are maintained at artificial levels relative to the U.S. dollar rather than at levels determined by the market. This type of system can lead to sudden and large adjustments in the currency which, in turn, can have a disruptive and negative effect on foreign investors. Certain Latin American countries also restrict the free conversion of their currency into foreign currencies, including the U.S. dollar. There is no significant foreign exchange market for many Latin American currencies and it would, as a result, be difficult for the Fund to engage in foreign currency transactions designed to protect the value of the Fund’s interests in securities denominated in such currencies.
Finally, a number of Latin American countries are among the largest debtors of developing countries. There have been moratoria on, and a rescheduling of, repayment with respect to these debts. Such events can restrict the flexibility of these debtor nations in the international markets and result in the imposition of onerous conditions on their economies.
Emerging Markets Fund | Special Risk Considerations Of Investing In Taiwanese Issuers Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Special Risk Considerations of Investing in Taiwanese Issuers. Investments in securities of Taiwanese issuers, including issuers located outside of Taiwan that generate significant revenues from Taiwan, involve risks and special considerations not typically associated with investments in the U.S. securities markets. To the extent the Fund continues to invest in securities issued by Taiwanese issuers, the Fund may be subject to the risk of investing in such issuers. Investments in Taiwanese issuers may subject the Fund to legal, regulatory, political, currency and economic risks that are specific to Taiwan. Specifically, Taiwan’s geographic proximity and history of political contention with China have resulted in ongoing tensions between the two countries. These tensions may materially affect the Taiwanese economy and its securities market. Taiwan’s economy is export-oriented, so it depends on an open world trade regime and remains vulnerable to fluctuations in the world economy.
Emerging Markets Fund | Stock Connect Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Stock Connect Risk. The Fund may invest in A-shares listed and traded on the Shanghai Stock Exchange and the Shenzhen Stock Exchange through Stock Connect, or on such other stock exchanges that participate in Stock Connect from time to time or in the future. Trading through Stock Connect is subject to a number of restrictions that may affect the Fund’s investments and returns. For example, trading through Stock Connect is subject to daily quotas that limit the maximum daily net purchases on any particular day, which may restrict or preclude the Fund’s ability to invest in Stock Connect A-shares. In addition, investments made through Stock Connect are subject to trading, clearance and settlement procedures that are relatively untested in the PRC, which could pose risks to the Fund. Furthermore, securities purchased via Stock Connect will be held via a book entry omnibus account in the name of HKSCC, Hong Kong’s clearing entity, at the CSDCC. The Fund’s ownership interest in Stock Connect securities will not be reflected directly in book entry with CSDCC and will instead only be reflected on the books of its Hong Kong sub-custodian. The Fund may therefore depend on HKSCC’s ability or willingness as record-holder of Stock Connect securities to
enforce the Fund’s shareholder rights. PRC law did not historically recognize the concept of beneficial ownership; while PRC regulations and the Hong Kong Stock Exchange have issued clarifications and guidance supporting the concept of beneficial ownership via Stock Connect, the interpretation of beneficial ownership in the PRC by regulators and courts may continue to evolve. Moreover, Stock Connect A-shares generally may not be sold, purchased or otherwise transferred other than through Stock Connect in accordance with applicable rules.
A primary feature of Stock Connect is the application of the home market’s laws and rules applicable to investors in A-shares. Therefore, the Fund’s investments in Stock Connect A-shares are generally subject to PRC securities regulations and listing rules, among other restrictions. The Fund will not benefit from access to Hong Kong investor compensation funds, which are set up to protect against defaults of trades, when investing through Stock Connect. Stock Connect is only available on days when markets in both the PRC and Hong Kong are open, which may limit the Fund’s ability to trade when it would be otherwise attractive to do so. Since the inception of Stock Connect, foreign investors (including the Fund) investing in A-shares through Stock Connect have been temporarily exempt from the PRC corporate income tax and value-added tax on the gains on disposal of such A-shares. Dividends are subject to PRC corporate income tax on a withholding basis at 10%, unless reduced under a double tax treaty with China upon application to and obtaining approval from the competent tax authority. Aside from these temporary measures, uncertainties in permanent PRC tax rules governing taxation of income and gains from investments in Stock Connect A-shares could result in unexpected tax liabilities for the Fund.
The Stock Connect program is a relatively new program and may be subject to further interpretation and guidance. There can be no assurance as to the program’s continued existence or whether future developments regarding the program may restrict or adversely affect the Fund’s investments or returns. In addition, the application and interpretation of the laws and regulations of Hong Kong and the PRC, and the rules, policies or guidelines published or applied by relevant regulators and exchanges in respect of the Stock Connect program are uncertain, and they may have a detrimental effect on the Fund’s investments and returns.
Emerging Markets Fund | Class A  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol GBFAX
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice 5.75%
Maximum Deferred Sales Charge (as a percentage of Offering Price) rr_MaximumDeferredSalesChargeOverOfferingPrice none [1]
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.75%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.59%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.59%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets none [2]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 1.59%
Expenses Deferred Charges [Text Block] rr_ExpensesDeferredChargesTextBlock A contingent deferred sales charge for Class A shares of 1.00% for one year applies to redemptions of qualified commissionable shares purchased at or above the $1 million breakpoint level.
Expense Breakpoint Discounts [Text] rr_ExpenseBreakpointDiscounts You may qualify for Class A sales charge discounts if you and your family (includes spouse and children under age 21) invest, or agree to invest in the future, at least $25,000, in the aggregate, in Classes A and C of the VanEck Funds.
Expense Breakpoint, Minimum Investment Required [Amount] rr_ExpenseBreakpointMinimumInvestmentRequiredAmount $ 25,000
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 727
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 1,048
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 1,391
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 2,356
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 727
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 1,048
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 1,391
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 2,356
Annual Return 2014 rr_AnnualReturn2014 (0.70%)
Annual Return 2015 rr_AnnualReturn2015 (12.91%)
Annual Return 2016 rr_AnnualReturn2016 (0.43%)
Annual Return 2017 rr_AnnualReturn2017 49.70%
Annual Return 2018 rr_AnnualReturn2018 (23.30%)
Annual Return 2019 rr_AnnualReturn2019 29.52%
Annual Return 2020 rr_AnnualReturn2020 16.43%
Annual Return 2021 rr_AnnualReturn2021 (12.15%)
Annual Return 2022 rr_AnnualReturn2022 (25.23%)
Annual Return 2023 rr_AnnualReturn2023 10.62%
Label rr_AverageAnnualReturnLabel Before Taxes
1 Year rr_AverageAnnualReturnYear01 4.26%
5 Years rr_AverageAnnualReturnYear05 0.65%
10 Years rr_AverageAnnualReturnYear10 0.21%
Emerging Markets Fund | Class A | After Taxes on Distributions  
Prospectus [Line Items] rr_ProspectusLineItems  
Label rr_AverageAnnualReturnLabel After Taxes on Distributions1 [3]
1 Year rr_AverageAnnualReturnYear01 4.14% [3]
5 Years rr_AverageAnnualReturnYear05 0.02% [3]
10 Years rr_AverageAnnualReturnYear10 (0.07%) [3]
Emerging Markets Fund | Class A | After Taxes on Distributions and Sales  
Prospectus [Line Items] rr_ProspectusLineItems  
Label rr_AverageAnnualReturnLabel After Taxes on Distributions and Sale of Fund Shares
1 Year rr_AverageAnnualReturnYear01 2.90%
5 Years rr_AverageAnnualReturnYear05 0.60%
10 Years rr_AverageAnnualReturnYear10 0.25%
Emerging Markets Fund | Class C  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol EMRCX
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage of Offering Price) rr_MaximumDeferredSalesChargeOverOfferingPrice 1.00%
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.75%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 1.00%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.83%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 2.58%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.06%) [2]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 2.52%
Expense Breakpoint Discounts [Text] rr_ExpenseBreakpointDiscounts You may qualify for Class A sales charge discounts if you and your family (includes spouse and children under age 21) invest, or agree to invest in the future, at least $25,000, in the aggregate, in Classes A and C of the VanEck Funds.
Expense Breakpoint, Minimum Investment Required [Amount] rr_ExpenseBreakpointMinimumInvestmentRequiredAmount $ 25,000
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 355
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 797
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 1,365
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 2,910
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 255
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 797
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 1,365
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 2,910
Label rr_AverageAnnualReturnLabel Before Taxes
1 Year rr_AverageAnnualReturnYear01 8.55%
5 Years rr_AverageAnnualReturnYear05 1.00%
10 Years rr_AverageAnnualReturnYear10 (0.02%)
Inception Date rr_AverageAnnualReturnInceptionDate Oct. 03, 2003
Emerging Markets Fund | Class I  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol EMRIX
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage of Offering Price) rr_MaximumDeferredSalesChargeOverOfferingPrice none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.75%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.48%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.23%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.22%) [2]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 1.01%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 103
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 369
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 655
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 1,469
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 103
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 369
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 655
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 1,469
Label rr_AverageAnnualReturnLabel Before Taxes
1 Year rr_AverageAnnualReturnYear01 11.26%
5 Years rr_AverageAnnualReturnYear05 2.36%
10 Years rr_AverageAnnualReturnYear10 1.32%
Inception Date rr_AverageAnnualReturnInceptionDate Dec. 31, 2007
Emerging Markets Fund | Class Y  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol EMRYX
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage of Offering Price) rr_MaximumDeferredSalesChargeOverOfferingPrice none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.75%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.48%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.23%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.12%) [2]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 1.11%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 113
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 378
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 664
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 1,478
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 113
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 378
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 664
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 1,478
Label rr_AverageAnnualReturnLabel Before Taxes
1 Year rr_AverageAnnualReturnYear01 11.17%
5 Years rr_AverageAnnualReturnYear05 2.28%
10 Years rr_AverageAnnualReturnYear10 1.21%
Inception Date rr_AverageAnnualReturnInceptionDate Apr. 30, 2010
Emerging Markets Fund | Class Z  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol EMRZX
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage of Offering Price) rr_MaximumDeferredSalesChargeOverOfferingPrice none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.75%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.43%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.18%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.27%) [2]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 0.91%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 93
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 348
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 623
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 1,408
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 93
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 348
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 623
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 1,408
Label rr_AverageAnnualReturnLabel Before Taxes
1 Year rr_AverageAnnualReturnYear01 11.34%
Since Inception rr_AverageAnnualReturnSinceInception (1.67%)
Inception Date rr_AverageAnnualReturnInceptionDate Sep. 16, 2019
Global Resources Fund  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk/Return [Heading] rr_RiskReturnHeading Global Resources Fund
Objective [Heading] rr_ObjectiveHeading INVESTMENT OBJECTIVE
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock The Global Resources Fund seeks long-term capital appreciation by investing primarily in global resource securities.
Objective, Secondary [Text Block] rr_ObjectiveSecondaryTextBlock Income is a secondary consideration.
Expense [Heading] rr_ExpenseHeading FUND 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 pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the tables and examples below. You may qualify for Class A sales charge discounts if you and your family (includes spouse and children under age 21) invest, or agree to invest in the future, at least $25,000, in the aggregate, in Classes A and C of the VanEck Funds. More information about these and other discounts is available from your financial professional and in the “Shareholder Information-Sales Charges” section of this prospectus, in the “Availability of Discounts” section of the Fund’s SAI and, with respect to purchases of shares through specific intermediaries, in Appendix A to this prospectus, entitled “Intermediary Sales Charge Discounts and Waivers”.
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)
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination May 1, 2025
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 rate may indicate that the Fund pays 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 44% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 44.00%
Expense Example [Heading] rr_ExpenseExampleHeading EXPENSE EXAMPLE
Expense Example Narrative [Text Block] rr_ExpenseExampleNarrativeTextBlock The following 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 either redeem all of your shares at the end of these periods or continue to hold them. The example also assumes that your investment has a 5% return each year and that the Fund’s operating expenses remain the same, and applies fee waivers and/or expense reimbursements, if any, for the periods indicated above under “Annual Fund Operating Expenses.” Although your actual expenses may be higher or lower, based on these assumptions, your costs would be:
Expense Example by, Year, Caption [Text] rr_ExpenseExampleByYearCaption Sold
Expense Example, No Redemption, By Year, Caption [Text] rr_ExpenseExampleNoRedemptionByYearCaption Held
Strategy [Heading] rr_StrategyHeading PRINCIPAL INVESTMENT STRATEGIES
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock
Under normal conditions, the Fund invests at least 80% of its net assets in securities of “global resource” companies and instruments that derive their value from “global resources”. Global resources include precious metals (including gold), base and industrial metals, energy, natural resources and other commodities. A global resource company is a company that derives, directly or indirectly, at least 50% of its revenues from exploration, development, production, distribution or facilitation of processes relating to global resources. The Fund concentrates its investments in the securities of global resource companies and instruments that derive their value from global resources.
The Fund may invest without limitation in any one global resources sector and is not required to invest any portion of its assets in any one global resources sector. The Fund may invest in securities of companies located anywhere in the world, including the U.S. Under ordinary circumstances, the Fund will invest in securities of issuers from a number of different countries, and may invest any amount of its assets in emerging markets. The Fund may invest in securities of companies of any capitalization range. Utilizing qualitative and quantitative measures, the Fund’s investment management team selects equity securities of companies that it believes represent value opportunities and/or that have growth potential. Candidates for the Fund’s portfolio are evaluated based on their relative desirability using a wide range of criteria and are regularly reviewed to ensure that they continue to offer absolute and relative desirability. The analysis of financially material risks and opportunities related to ESG (i.e. Environmental, Social and Governance) factors is a component of the overall investment process. ESG considerations can affect the Adviser’s fundamental assessment of a company or country.
The Fund may use derivative instruments, such as structured notes, warrants, currency forwards, futures contracts, options and swap agreements, to gain or hedge exposure to global resources, global resource companies and other assets. The Fund may enter into foreign currency transactions to attempt to moderate the effect of currency fluctuations. The Fund may write covered call options on portfolio securities to the extent that the value of all securities with respect to which covered calls are written does not exceed 10% of the Fund’s net asset value. The Fund may also invest up to 20% of its net assets in securities issued by other investment companies, including exchange-traded funds (“ETFs”). The Fund may also invest in money market funds, but these investments are not subject to this limitation. The Fund may invest in ETFs to participate in, or gain exposure to, certain market sectors, or when direct investments in certain countries are not permitted or available.
Strategy Portfolio Concentration [Text] rr_StrategyPortfolioConcentration Under normal conditions, the Fund invests at least 80% of its net assets in securities of “global resource” companies and instruments that derive their value from “global resources”. Global resources include precious metals (including gold), base and industrial metals, energy, natural resources and other commodities.
Risk [Heading] rr_RiskHeading PRINCIPAL RISKS
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading PERFORMANCE
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock
The following chart and table provide some indication of the risks of investing in the Fund by showing changes in the Fund’s performance from year to year and by showing how the Fund’s average annual total returns compare with those of a broad measure of market performance and one or more other performance measures. The Fund’s past performance (before and after
taxes) is not necessarily an indication of how the Fund will perform in the future. The annual returns in the bar chart are for the Fund’s Class A shares and do not reflect sales loads. If sales loads were reflected, returns would be lower than those shown.
Additionally, large purchases and/or redemptions of shares of a class, relative to the amount of assets represented by the class, may cause the annual returns for each class to differ. Updated performance information for the Fund is available on the VanEck website at vaneck.com.
Performance Information Illustrates Variability of Returns [Text] rr_PerformanceInformationIllustratesVariabilityOfReturns The following chart and table provide some indication of the risks of investing in the Fund by showing changes in the Fund’s performance from year to year and by showing how the Fund’s average annual total returns compare with those of a broad measure of market performance and one or more other performance measures.
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress vaneck.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 CLASS A: Annual Total Returns (%) as of 12/31
Bar Chart Does Not Reflect Sales Loads [Text] rr_BarChartDoesNotReflectSalesLoads The annual returns in the bar chart are for the Fund’s Class A shares and do not reflect sales loads. If sales loads were reflected, returns would be lower than those shown.
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock
Best Quarter:+33.29%2Q 2020
Worst Quarter:-40.01%1Q 2020
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Best Quarter:
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Jun. 30, 2020
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 33.29%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Worst Quarter:
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Mar. 31, 2020
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (40.01%)
Performance Table Heading rr_PerformanceTableHeading Average Annual Total Returns as of 12/31/2023
Performance Table Uses Highest Federal Rate rr_PerformanceTableUsesHighestFederalRate After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes.
Performance Table Not Relevant to Tax Deferred rr_PerformanceTableNotRelevantToTaxDeferred The after-tax return information shown above does not apply to Fund shares held through a tax-advantaged account, such as a 401(k) plan or Investment Retirement Account.
Performance Table One Class of after Tax Shown [Text] rr_PerformanceTableOneClassOfAfterTaxShown These returns are shown for one class of shares only; after-tax returns for the other classes may vary.
Performance Table Closing [Text Block] rr_PerformanceTableClosingTextBlock
See “License Agreements and Disclaimers” for important information.
Global Resources Fund | S&P Global Natural Resources Index (reflects no deduction for expenses or taxes)  
Prospectus [Line Items] rr_ProspectusLineItems  
Label rr_AverageAnnualReturnLabel S&P® Global Natural Resources Index (reflects no deduction for fees, expenses or taxes, except withholding taxes)
1 Year rr_AverageAnnualReturnYear01 4.08%
5 Years rr_AverageAnnualReturnYear05 11.15%
10 Years rr_AverageAnnualReturnYear10 5.15%
Global Resources Fund | MSCI AC World Index (reflects no deduction for fees, expenses or taxes, except withholding taxes)  
Prospectus [Line Items] rr_ProspectusLineItems  
Label rr_AverageAnnualReturnLabel MSCI AC World Index (reflects no deduction for fees, expenses or taxes, except withholding taxes)
1 Year rr_AverageAnnualReturnYear01 22.20%
5 Years rr_AverageAnnualReturnYear05 11.72%
10 Years rr_AverageAnnualReturnYear10 7.93%
Global Resources Fund | Risk Lose Money [Member]  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock The Fund’s share price and return will fluctuate with changes in the market value of the Fund’s portfolio securities. Accordingly, an investment in the Fund involves the risk of losing money.
Global Resources Fund | Active Management Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Active Management Risk.  In managing the Fund’s portfolio, the Adviser will apply investment techniques and risk analyses in making investment decisions for the Fund, but there can be no guarantee that these will produce the desired results. Investment decisions made by the Adviser in seeking to achieve the Fund’s investment objective may cause a decline in the value of the investments held by the Fund and, in turn, cause the Fund’s shares to lose value or underperform other funds with similar investment objectives.
Global Resources Fund | Agriculture Companies Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Agriculture Companies Risk. The Fund will be sensitive to, and its performance will depend to a greater extent on, the overall condition of the agriculture companies. Economic forces affecting agricultural companies and related industries, including forces affecting the agricultural commodity prices, labor costs, and energy and financial markets, could adversely affect the Fund’s portfolio companies and thus, the Fund’s financial situation and profitability. Agricultural and livestock production and trade flows are significantly affected by government policies and regulations. In addition, these companies are also subject to risks associated with cyclicality of revenues and earnings, currency fluctuations, changing consumer tastes, extensive competition, consolidation,
and excess capacity. In addition, agriculture companies must comply with a broad range of environmental health, food safety and worker safety laws and regulations which could adversely affect the Fund. Additional or more stringent environmental and food safety laws and regulations may be enacted in the future and such changes could have a material adverse effect on the business of the agriculture companies.
Global Resources Fund | Commodities And Commodity-Linked Instruments Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Commodities and Commodity-Linked Instruments Risk. Commodities include, among other things, energy products, agricultural products, industrial metals, precious metals and livestock. The commodities markets may fluctuate widely based on a variety of factors, including overall market movements, economic events and policies, changes in interest rates or inflation rates, changes in monetary and exchange control programs, war, acts of terrorism, natural disasters and technological developments. Variables such as disease, drought, floods, weather, trade, embargoes, tariffs and other political events, in particular, may have a larger impact on commodity prices than on traditional securities. These additional variables may create additional investment risks that subject the Fund’s investments to greater volatility than investments in traditional securities. The prices of commodities can also fluctuate widely due to supply and demand disruptions in major producing or consuming regions. Because certain commodities may be produced in a limited number of countries and may be controlled by a small number of producers, political, economic and supply-related events in such countries could have a disproportionate impact on the prices of such commodities. These factors may affect the value of the Fund’s investments in varying ways, and different factors may cause the values and the volatility of the Fund’s investments to move in inconsistent directions at inconsistent rates. Because the value of a commodity-linked derivative instrument and structured note typically are based upon the price movements of physical commodities, the value of these securities will rise or fall in response to changes in the underlying commodities or related index of investment.
Global Resources Fund | Commodities And Commodity-Linked Instruments Tax Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Commodities and Commodity-Linked Instruments Tax Risk. The tax treatment of commodity-linked derivative instruments may be adversely affected by changes in legislation, regulations or other legally binding authority. If, as a result of any such adverse action, the income of the Fund from certain commodity-linked derivatives were treated as non- qualifying income, the Fund might fail to qualify as a regulated investment company and/or be subject to federal income tax at the Fund level. The uncertainty surrounding the treatment of certain derivative instruments under the qualification tests for a regulated investment company may limit the Fund’s use of such derivative instruments.
The Fund may be required, for federal income tax purposes, to mark-to-market and recognize as income for each taxable year any net unrealized gains and losses on certain futures contracts and option contracts as of the end of the year as well as those actually realized during the year. Gain or loss from futures contracts required to be marked-to-market will be 60% long-term and 40% short-term capital gain or loss if held directly by the Fund. The Fund may be required to defer the recognition of losses on futures contracts or certain option contracts to the extent of any unrecognized gains on related positions held by the Fund.
Global Resources Fund | Derivatives Risk Member  
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Derivatives Risk.  Derivatives and other similar instruments (referred to collectively as “derivatives”) are financial instruments whose values are based on the value of one or more reference assets or indicators, such as a security, currency, interest rate, or index. The Fund’s use of derivatives involves risks different from, and possibly greater than, the risks associated with investing directly in securities and other more traditional investments. Moreover, although the value of a derivative is based on an underlying asset or indicator, a derivative typically does not carry the same rights as would be the case if the Fund invested directly in the underlying securities, currencies or other assets.
Derivatives are subject to a number of risks, such as potential changes in value in response to market developments or, in the case of “over-the-counter” derivatives, as a result of a counterparty’s credit quality and the risk that a derivative transaction may not have the effect the Adviser anticipated. Derivatives also involve the risk of mispricing or improper valuation and the risk that changes in the value of a derivative may not achieve the desired correlation with the underlying asset or indicator. Derivative transactions can create investment leverage and may be highly volatile, and the Fund could lose more than the amount it invests. The use of derivatives may increase the amount and affect the timing and character of taxes payable by shareholders of the Fund.
Many derivative transactions are entered into “over-the-counter” without a central clearinghouse; as a result, the value of such a derivative transaction will depend on, among other factors, the ability and the willingness of the Fund’s counterparty to perform its obligations under the transaction. If a counterparty were to default on its obligations, the Fund’s contractual remedies against such counterparty may be subject to bankruptcy and insolvency laws, which could affect the Fund’s rights as a creditor (e.g., the Fund may not receive the net amount of payments that it is contractually entitled to receive). Counterparty risk also refers to the related risks of having concentrated exposure to such a counterparty. A liquid secondary market may not always exist for the Fund’s derivative positions at any time, and the Fund may not be able to initiate or liquidate a swap position at an advantageous time or price, which may result in significant losses. The Fund may also face the risk that it may not be able to meet margin and payment requirements and maintain a derivatives position.
Derivatives are also subject to operational and legal risks. Operational risk generally refers to risk related to potential operational issues, including documentation issues, settlement issues, system failures, inadequate controls, and human errors. Legal risk generally refers to insufficient documentation, insufficient capacity or authority of counterparty, or legality or enforceability of a contract.
Global Resources Fund | Direct Investments Risk Member  
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Direct Investments Risk. Direct investments may involve a high degree of business and financial risk that can result in substantial losses. Because of the absence of any public trading market for these investments, the Fund may take longer to
liquidate these positions than would be the case for publicly traded securities. Direct investments are generally considered illiquid and will be aggregated with other illiquid investments for purposes of the Fund's limitation on illiquid investments.
Global Resources Fund | Emerging Market Issuers Risk Member  
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Risk [Text Block] rr_RiskTextBlock
Emerging Market Issuers Risk. Investments in securities of emerging market issuers involve risks not typically associated with investments in securities of issuers in more developed countries that may negatively affect the value of your investment in the Fund. Such heightened risks may include, among others, expropriation and/or nationalization of assets, restrictions on and government intervention in international trade, confiscatory taxation, political instability, including authoritarian and/or military involvement in governmental decision making, armed conflict, the impact on the economy as a result of civil war, crime (including drug violence) and social instability as a result of religious, ethnic and/or socioeconomic unrest. Issuers in certain emerging market countries are subject to less stringent requirements regarding accounting, auditing, financial reporting and record keeping than are issuers in more developed markets, and therefore, all material information may not be available or reliable. Emerging markets are also more likely than developed markets to experience problems with the clearing and settling of trades, as well as the holding of securities by local banks, agents and depositories. Low trading volumes and volatile prices in less developed markets may make trades harder to complete and settle, and governments or trade groups may compel local agents to hold securities in designated depositories that may not be subject to independent evaluation. Local agents are held only to the standards of care of their local markets. In general, the less developed a country’s securities markets are, the greater the likelihood of custody problems. Additionally, each of the factors described below could have a negative impact on the Fund’s performance and increase the volatility of the Fund.
Securities Markets. Securities markets in emerging market countries are underdeveloped and are often considered to be less correlated to global economic cycles than those markets located in more developed countries. Securities markets in emerging market countries are subject to greater risks associated with market volatility, lower market capitalization, lower trading volume, illiquidity, inflation, greater price fluctuations, uncertainty regarding the existence of trading markets, governmental control and heavy regulation of labor and industry. These factors, coupled with restrictions on foreign investment and other factors, limit the supply of securities available for investment by the Fund. This will affect the rate at which the Fund is able to invest in emerging market countries, the purchase and sale prices for such securities and the timing of purchases and sales. Emerging markets can experience high rates of inflation, deflation and currency devaluation. The prices of certain securities listed on securities markets in emerging market countries have been subject to sharp fluctuations and sudden declines, and no assurance can be given as to the future performance of listed securities in general. Volatility of prices may be greater than in more developed securities markets. Moreover, securities markets in emerging market countries may be closed for extended periods of time or trading on securities markets may be suspended altogether due to political or civil unrest. Market volatility may also be heightened by the actions of a small number of investors. Brokerage firms in emerging market countries may be fewer in number and less established than brokerage firms in more developed markets. Since the Fund may need to effect securities transactions through these brokerage firms, the Fund is subject to the risk that these brokerage firms will not be able to fulfill their obligations to the Fund. This risk is magnified to the extent the Fund effects securities transactions through a single brokerage firm or a small number of brokerage firms. In addition, the infrastructure for the safe custody of securities and for purchasing and selling securities, settling trades, collecting dividends, initiating corporate actions, and following corporate activity is not as well developed in emerging market countries as is the case in certain more developed markets.
Political and Economic Risk. Certain emerging market countries have historically been subject to political instability and their prospects are tied to the continuation of economic and political liberalization in the region. Instability may result from factors such as government or military intervention in decision making, terrorism, civil unrest, extremism or hostilities between neighboring countries. Any of these factors, including an outbreak of hostilities could negatively impact the Fund’s returns. Limited political and democratic freedoms in emerging market countries might cause significant social unrest. These factors may have a significant adverse effect on an emerging market country’s economy.
Many emerging market countries may be heavily dependent upon international trade and, consequently, may continue to be negatively affected by trade barriers, exchange controls, managed adjustments in relative currency values and other protectionist measures imposed or negotiated by the countries with which it trades. They also have been, and may continue to be, adversely affected by economic conditions in the countries with which they trade.
In addition, commodities (such as oil, gas and minerals) represent a significant percentage of certain emerging market countries’ exports and these economies are particularly sensitive to fluctuations in commodity prices. Adverse economic events in one country may have a significant adverse effect on other countries of this region. In addition, most emerging market countries have experienced, at one time or another, severe and persistent levels of inflation, including, in some cases, hyperinflation. This has, in turn, led to high interest rates, extreme measures by governments to keep inflation in check, and a generally debilitating effect on economic growth.
Although inflation in many countries has lessened, there is no guarantee it will remain at lower levels. The political history of certain emerging market countries has been characterized by political uncertainty, intervention by the military in civilian and economic spheres, and political corruption. Such events could reverse favorable trends toward market and
economic reform, privatization, and removal of trade barriers, and result in significant disruption in securities markets in the region.
Also, from time to time, certain issuers located in emerging market countries in which the Fund invests may operate in, or have dealings with, countries subject to sanctions and/or embargoes imposed by the U.S. Government and the United Nations and/or countries identified by the U.S. Government as state sponsors of terrorism. As a result, an issuer may sustain damage to its reputation if it is identified as an issuer which operates in, or has dealings with, such countries. The Fund, as an investor in such issuers, will be indirectly subject to those risks.
The economies of one or more countries in which the Fund may invest may be in various states of transition from a planned economy to a more market oriented economy. The economies of such countries differ from the economies of most developed countries in many respects, including levels of government involvement, states of development, growth rates, control of foreign exchange and allocation of resources. Economic growth in these economies may be uneven both geographically and among various sectors of their economies and may also be accompanied by periods of high inflation. Political changes, social instability and adverse diplomatic developments in these countries could result in the imposition of additional government restrictions, including expropriation of assets, confiscatory taxes or nationalization of some or all of the property held by the underlying issuers of securities of emerging market issuers. There is no guarantee that the governments of these countries will not revert back to some form of planned or non-market oriented economy, and such governments continue to be active participants in many economic sectors through ownership positions and regulation. The allocation of resources in such countries is subject to a high level of government control. Such countries’ governments may strictly regulate the payment of foreign currency denominated obligations and set monetary policy. Through their policies, these governments may provide preferential treatment to particular industries or companies. The policies set by the government of one of these countries could have a substantial effect on that country’s economy.
Investment and Repatriation Restrictions. The government in an emerging market country may restrict or control to varying degrees the ability of foreign investors to invest in securities of issuers located or operating in such emerging market countries. These restrictions and/or controls may at times limit or prevent foreign investment in securities of issuers located or operating in emerging market countries and may inhibit the Fund’s ability to meet its investment objective. In addition, the Fund may not be able to buy or sell securities or receive full value for such securities. Moreover, certain emerging market countries may require governmental approval or special licenses prior to investments by foreign investors and may limit the amount of investments by foreign investors in a particular industry and/or issuer; may limit such foreign investment to a certain class of securities of an issuer that may have less advantageous rights than the classes available for purchase by domiciliaries of such emerging market countries; and/or may impose additional taxes on foreign investors. A delay in obtaining a required government approval or a license would delay investments in those emerging market countries, and, as a result, the Fund may not be able to invest in certain securities while approval is pending. The government of certain emerging market countries may also withdraw or decline to renew a license that enables the Fund to invest in such country. These factors make investing in issuers located or operating in emerging market countries significantly riskier than investing in issuers located or operating in more developed countries, and any one of them could cause a decline in the net asset value of the Fund.
Additionally, investments in issuers located in certain emerging market countries may be subject to a greater degree of risk associated with governmental approval in connection with the repatriation of investment income, capital or the proceeds of sales of securities by foreign investors. Moreover, there is the risk that if the balance of payments in an emerging market country declines, the government of such country may impose temporary restrictions on foreign capital remittances. Consequently, the Fund could be adversely affected by delays in, or a refusal to grant, required governmental approval for repatriation of capital, as well as by the application to the Fund of any restrictions on investments. Furthermore, investments in emerging market countries may require the Fund to adopt special procedures, seek local government approvals or take other actions, each of which may involve additional costs to the Fund.
Available Disclosure About Emerging Market Issuers. Issuers located or operating in emerging market countries are not subject to the same rules and regulations as issuers located or operating in more developed countries. Therefore, there may be less financial and other information publicly available with regard to issuers located or operating in emerging market countries and such issuers are not subject to the uniform accounting, auditing and financial reporting standards applicable to issuers located or operating in more developed countries.
Foreign Currency Considerations. The Fund’s assets that are invested in securities of issuers in emerging market countries will generally be denominated in foreign currencies, and the proceeds received by the Fund from these investments will be principally in foreign currencies. The value of an emerging market country’s currency may be subject to a high degree of fluctuation. This fluctuation may be due to changes in interest rates, the effects of monetary policies issued by the United States, foreign governments, central banks or supranational entities, the imposition of currency controls or other national or global political or economic developments. The economies of certain emerging market countries can be significantly affected by currency devaluations. Certain emerging market countries may also have managed currencies which are maintained at artificial levels relative to the U.S. dollar rather than at levels determined by
the market. This type of system can lead to sudden and large adjustments in the currency which, in turn, can have a disruptive and negative effect on foreign investors.
The Fund’s exposure to an emerging market country’s currency and changes in value of such foreign currencies versus the U.S. dollar may reduce the Fund’s investment performance and the value of your investment in the Fund. Meanwhile, the Fund will compute and expects to distribute its income in U.S. dollars, and the computation of income will be made on the date that the income is earned by the Fund at the foreign exchange rate in effect on that date. Therefore, if the value of the respective emerging market country’s currency falls relative to the U.S. dollar between the earning of the income and the time at which the Fund converts the relevant emerging market country’s currency to U.S. dollars, the Fund may be required to liquidate certain positions in order to make distributions if the Fund has insufficient cash in U.S. dollars to meet distribution requirements under the Internal Revenue Code. The liquidation of investments, if required, could be at disadvantageous prices or otherwise have an adverse impact on the Fund’s performance.
Certain emerging market countries also restrict the free conversion of their currency into foreign currencies, including the U.S. dollar. There is no significant foreign exchange market for many such currencies and it would, as a result, be difficult for the Fund to engage in foreign currency transactions designed to protect the value of the Fund’s interests in securities denominated in such currencies. Furthermore, if permitted, the Fund may incur costs in connection with conversions between U.S. dollars and an emerging market country’s currency. Foreign exchange dealers realize a profit based on the difference between the prices at which they are buying and selling various currencies. Thus, a dealer normally will offer to sell a foreign currency to the Fund at one rate, while offering a lesser rate of exchange should the Fund desire immediately to resell that currency to the dealer. The Fund will conduct its foreign currency exchange transactions either on a spot (i.e., cash) basis at the spot rate prevailing in the foreign currency exchange market, or through entering into forward, futures or options contracts to purchase or sell foreign currencies.
Operational and Settlement Risk. In addition to having less developed securities markets, emerging market countries have less developed custody and settlement practices than certain developed countries. Rules adopted under the Investment Company Act of 1940 permit the Fund to maintain its foreign securities and cash in the custody of certain eligible non-U.S. banks and securities depositories. Banks in emerging market countries that are eligible foreign sub-custodians may be recently organized or otherwise lack extensive operating experience. In addition, in certain emerging market countries there may be legal restrictions or limitations on the ability of the Fund to recover assets held in custody by a foreign sub-custodian in the event of the bankruptcy of the sub-custodian. Because settlement systems in emerging market countries may be less organized than in other developed markets, there may be a risk that settlement may be delayed and that cash or securities of the Fund may be in jeopardy because of failures of or defects in the systems. Under the laws in many emerging market countries, the Fund may be required to release local shares before receiving cash payment or may be required to make cash payment prior to receiving local shares, creating a risk that the Fund may surrender cash or securities without ever receiving securities or cash from the other party. Settlement systems in emerging market countries also have a higher risk of failed trades and back to back settlements may not be possible.
The Fund may not be able to convert a foreign currency to U.S. dollars in time for the settlement of redemption requests. In the event that the Fund is not able to convert the foreign currency to U.S. dollars in time for settlement, which may occur as a result of the delays described above, the Fund may be required to liquidate certain investments and/or borrow money in order to fund such redemption. The liquidation of investments, if required, could be at disadvantageous prices or otherwise have an adverse impact on the Fund’s performance (e.g., by causing the Fund to overweight foreign currency denominated holdings and underweight other holdings which were sold to fund redemptions). In addition, the Fund will incur interest expense on any borrowings and the borrowings will cause the Fund to be leveraged, which may magnify gains and losses on its investments.
In certain emerging market countries, the marketability of investments may be limited due to the restricted opening hours of trading exchanges, and a relatively high proportion of market value may be concentrated in the hands of a relatively small number of investors. In addition, because certain emerging market countries’ trading exchanges on which the Fund’s portfolio securities may trade are open when the relevant exchanges are closed, the Fund may be subject to heightened risk associated with market movements. Trading volume may be lower on certain emerging market countries’ trading exchanges than on more developed securities markets and securities may be generally less liquid. The infrastructure for clearing, settlement and registration on the primary and secondary markets of certain emerging market countries are less developed than in certain other markets and under certain circumstances this may result in the Fund experiencing delays in settling and/or registering transactions in the markets in which it invests, particularly if the growth of foreign and domestic investment in certain emerging market countries places an undue burden on such investment infrastructure. Such delays could affect the speed with which the Fund can transmit redemption proceeds and may inhibit the initiation and realization of investment opportunities at optimum times.
Certain issuers in emerging market countries may utilize share blocking schemes. Share blocking refers to a practice, in certain foreign markets, where voting rights related to an issuer’s securities are predicated on these securities being blocked from trading at the custodian or sub-custodian level for a period of time around a shareholder meeting. These
restrictions have the effect of barring the purchase and sale of certain voting securities within a specified number of days before and, in certain instances, after a shareholder meeting where a vote of shareholders will be taken. Share blocking may prevent the Fund from buying or selling securities for a period of time. During the time that shares are blocked, trades in such securities will not settle. The blocking period can last up to several weeks. The process for having a blocking restriction lifted can be quite onerous with the particular requirements varying widely by country. In addition, in certain countries, the block cannot be removed. As a result of the ramifications of voting ballots in markets that allow share blocking, the Adviser, on behalf of the Fund, reserves the right to abstain from voting proxies in those markets.
Corporate and Securities Laws. Securities laws in emerging market countries are relatively new and unsettled and, consequently, there is a risk of rapid and unpredictable change in laws regarding foreign investment, securities regulation, title to securities and securityholders rights. Accordingly, foreign investors may be adversely affected by new or amended laws and regulations. In addition, the systems of corporate governance to which emerging market issuers are subject may be less advanced than those systems to which issuers located in more developed countries are subject, and therefore, securityholders of issuers located in emerging market countries may not receive many of the protections available to securityholders of issuers located in more developed countries. In circumstances where adequate laws and securityholders rights exist, it may not be possible to obtain swift and equitable enforcement of the law. In addition, the enforcement of systems of taxation at federal, regional and local levels in emerging market countries may be inconsistent and subject to sudden change. The Fund has limited rights and few practical remedies in emerging markets and the ability of U.S. authorities to bring enforcement actions in emerging markets may be limited.
Global Resources Fund | Emerging Market Issuers Risk, Securities Markets Member  
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Securities Markets. Securities markets in emerging market countries are underdeveloped and are often considered to be less correlated to global economic cycles than those markets located in more developed countries. Securities markets in emerging market countries are subject to greater risks associated with market volatility, lower market capitalization, lower trading volume, illiquidity, inflation, greater price fluctuations, uncertainty regarding the existence of trading markets, governmental control and heavy regulation of labor and industry. These factors, coupled with restrictions on foreign investment and other factors, limit the supply of securities available for investment by the Fund. This will affect the rate at which the Fund is able to invest in emerging market countries, the purchase and sale prices for such securities and the timing of purchases and sales. Emerging markets can experience high rates of inflation, deflation and currency devaluation. The prices of certain securities listed on securities markets in emerging market countries have been subject to sharp fluctuations and sudden declines, and no assurance can be given as to the future performance of listed securities in general. Volatility of prices may be greater than in more developed securities markets. Moreover, securities markets in emerging market countries may be closed for extended periods of time or trading on securities markets may be suspended altogether due to political or civil unrest. Market volatility may also be heightened by the actions of a small number of investors. Brokerage firms in emerging market countries may be fewer in number and less established than brokerage firms in more developed markets. Since the Fund may need to effect securities transactions through these brokerage firms, the Fund is subject to the risk that these brokerage firms will not be able to fulfill their obligations to the Fund. This risk is magnified to the extent the Fund effects securities transactions through a single brokerage firm or a small number of brokerage firms. In addition, the infrastructure for the safe custody of securities and for purchasing and selling securities, settling trades, collecting dividends, initiating corporate actions, and following corporate activity is not as well developed in emerging market countries as is the case in certain more developed markets.
Global Resources Fund | Emerging Market Issuers Risk, Political And Economic Risk Member  
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Political and Economic Risk. Certain emerging market countries have historically been subject to political instability and their prospects are tied to the continuation of economic and political liberalization in the region. Instability may result from factors such as government or military intervention in decision making, terrorism, civil unrest, extremism or hostilities between neighboring countries. Any of these factors, including an outbreak of hostilities could negatively impact the Fund’s returns. Limited political and democratic freedoms in emerging market countries might cause significant social unrest. These factors may have a significant adverse effect on an emerging market country’s economy.
Many emerging market countries may be heavily dependent upon international trade and, consequently, may continue to be negatively affected by trade barriers, exchange controls, managed adjustments in relative currency values and other protectionist measures imposed or negotiated by the countries with which it trades. They also have been, and may continue to be, adversely affected by economic conditions in the countries with which they trade.
In addition, commodities (such as oil, gas and minerals) represent a significant percentage of certain emerging market countries’ exports and these economies are particularly sensitive to fluctuations in commodity prices. Adverse economic events in one country may have a significant adverse effect on other countries of this region. In addition, most emerging market countries have experienced, at one time or another, severe and persistent levels of inflation, including, in some cases, hyperinflation. This has, in turn, led to high interest rates, extreme measures by governments to keep inflation in check, and a generally debilitating effect on economic growth.
Although inflation in many countries has lessened, there is no guarantee it will remain at lower levels. The political history of certain emerging market countries has been characterized by political uncertainty, intervention by the military in civilian and economic spheres, and political corruption. Such events could reverse favorable trends toward market and
economic reform, privatization, and removal of trade barriers, and result in significant disruption in securities markets in the region.
Also, from time to time, certain issuers located in emerging market countries in which the Fund invests may operate in, or have dealings with, countries subject to sanctions and/or embargoes imposed by the U.S. Government and the United Nations and/or countries identified by the U.S. Government as state sponsors of terrorism. As a result, an issuer may sustain damage to its reputation if it is identified as an issuer which operates in, or has dealings with, such countries. The Fund, as an investor in such issuers, will be indirectly subject to those risks.
The economies of one or more countries in which the Fund may invest may be in various states of transition from a planned economy to a more market oriented economy. The economies of such countries differ from the economies of most developed countries in many respects, including levels of government involvement, states of development, growth rates, control of foreign exchange and allocation of resources. Economic growth in these economies may be uneven both geographically and among various sectors of their economies and may also be accompanied by periods of high inflation. Political changes, social instability and adverse diplomatic developments in these countries could result in the imposition of additional government restrictions, including expropriation of assets, confiscatory taxes or nationalization of some or all of the property held by the underlying issuers of securities of emerging market issuers. There is no guarantee that the governments of these countries will not revert back to some form of planned or non-market oriented economy, and such governments continue to be active participants in many economic sectors through ownership positions and regulation. The allocation of resources in such countries is subject to a high level of government control. Such countries’ governments may strictly regulate the payment of foreign currency denominated obligations and set monetary policy. Through their policies, these governments may provide preferential treatment to particular industries or companies. The policies set by the government of one of these countries could have a substantial effect on that country’s economy.
Global Resources Fund | Emerging Market Issuers Risk, Investment And Repatriation Restrictions Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Investment and Repatriation Restrictions. The government in an emerging market country may restrict or control to varying degrees the ability of foreign investors to invest in securities of issuers located or operating in such emerging market countries. These restrictions and/or controls may at times limit or prevent foreign investment in securities of issuers located or operating in emerging market countries and may inhibit the Fund’s ability to meet its investment objective. In addition, the Fund may not be able to buy or sell securities or receive full value for such securities. Moreover, certain emerging market countries may require governmental approval or special licenses prior to investments by foreign investors and may limit the amount of investments by foreign investors in a particular industry and/or issuer; may limit such foreign investment to a certain class of securities of an issuer that may have less advantageous rights than the classes available for purchase by domiciliaries of such emerging market countries; and/or may impose additional taxes on foreign investors. A delay in obtaining a required government approval or a license would delay investments in those emerging market countries, and, as a result, the Fund may not be able to invest in certain securities while approval is pending. The government of certain emerging market countries may also withdraw or decline to renew a license that enables the Fund to invest in such country. These factors make investing in issuers located or operating in emerging market countries significantly riskier than investing in issuers located or operating in more developed countries, and any one of them could cause a decline in the net asset value of the Fund.
Additionally, investments in issuers located in certain emerging market countries may be subject to a greater degree of risk associated with governmental approval in connection with the repatriation of investment income, capital or the proceeds of sales of securities by foreign investors. Moreover, there is the risk that if the balance of payments in an emerging market country declines, the government of such country may impose temporary restrictions on foreign capital remittances. Consequently, the Fund could be adversely affected by delays in, or a refusal to grant, required governmental approval for repatriation of capital, as well as by the application to the Fund of any restrictions on investments. Furthermore, investments in emerging market countries may require the Fund to adopt special procedures, seek local government approvals or take other actions, each of which may involve additional costs to the Fund.
Global Resources Fund | Emerging Market Issuers Risk, Available Disclosure About Emerging Market Issuers Member  
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Risk [Text Block] rr_RiskTextBlock
Available Disclosure About Emerging Market Issuers. Issuers located or operating in emerging market countries are not subject to the same rules and regulations as issuers located or operating in more developed countries. Therefore, there may be less financial and other information publicly available with regard to issuers located or operating in emerging market countries and such issuers are not subject to the uniform accounting, auditing and financial reporting standards applicable to issuers located or operating in more developed countries.
Global Resources Fund | Emerging Market Issuers Risk, Foreign Currency Considerations Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Foreign Currency Considerations. The Fund’s assets that are invested in securities of issuers in emerging market countries will generally be denominated in foreign currencies, and the proceeds received by the Fund from these investments will be principally in foreign currencies. The value of an emerging market country’s currency may be subject to a high degree of fluctuation. This fluctuation may be due to changes in interest rates, the effects of monetary policies issued by the United States, foreign governments, central banks or supranational entities, the imposition of currency controls or other national or global political or economic developments. The economies of certain emerging market countries can be significantly affected by currency devaluations. Certain emerging market countries may also have managed currencies which are maintained at artificial levels relative to the U.S. dollar rather than at levels determined by
the market. This type of system can lead to sudden and large adjustments in the currency which, in turn, can have a disruptive and negative effect on foreign investors.
The Fund’s exposure to an emerging market country’s currency and changes in value of such foreign currencies versus the U.S. dollar may reduce the Fund’s investment performance and the value of your investment in the Fund. Meanwhile, the Fund will compute and expects to distribute its income in U.S. dollars, and the computation of income will be made on the date that the income is earned by the Fund at the foreign exchange rate in effect on that date. Therefore, if the value of the respective emerging market country’s currency falls relative to the U.S. dollar between the earning of the income and the time at which the Fund converts the relevant emerging market country’s currency to U.S. dollars, the Fund may be required to liquidate certain positions in order to make distributions if the Fund has insufficient cash in U.S. dollars to meet distribution requirements under the Internal Revenue Code. The liquidation of investments, if required, could be at disadvantageous prices or otherwise have an adverse impact on the Fund’s performance.
Certain emerging market countries also restrict the free conversion of their currency into foreign currencies, including the U.S. dollar. There is no significant foreign exchange market for many such currencies and it would, as a result, be difficult for the Fund to engage in foreign currency transactions designed to protect the value of the Fund’s interests in securities denominated in such currencies. Furthermore, if permitted, the Fund may incur costs in connection with conversions between U.S. dollars and an emerging market country’s currency. Foreign exchange dealers realize a profit based on the difference between the prices at which they are buying and selling various currencies. Thus, a dealer normally will offer to sell a foreign currency to the Fund at one rate, while offering a lesser rate of exchange should the Fund desire immediately to resell that currency to the dealer. The Fund will conduct its foreign currency exchange transactions either on a spot (i.e., cash) basis at the spot rate prevailing in the foreign currency exchange market, or through entering into forward, futures or options contracts to purchase or sell foreign currencies.
Global Resources Fund | Emerging Market Issuers Risk, Operational And Settlement Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Operational and Settlement Risk. In addition to having less developed securities markets, emerging market countries have less developed custody and settlement practices than certain developed countries. Rules adopted under the Investment Company Act of 1940 permit the Fund to maintain its foreign securities and cash in the custody of certain eligible non-U.S. banks and securities depositories. Banks in emerging market countries that are eligible foreign sub-custodians may be recently organized or otherwise lack extensive operating experience. In addition, in certain emerging market countries there may be legal restrictions or limitations on the ability of the Fund to recover assets held in custody by a foreign sub-custodian in the event of the bankruptcy of the sub-custodian. Because settlement systems in emerging market countries may be less organized than in other developed markets, there may be a risk that settlement may be delayed and that cash or securities of the Fund may be in jeopardy because of failures of or defects in the systems. Under the laws in many emerging market countries, the Fund may be required to release local shares before receiving cash payment or may be required to make cash payment prior to receiving local shares, creating a risk that the Fund may surrender cash or securities without ever receiving securities or cash from the other party. Settlement systems in emerging market countries also have a higher risk of failed trades and back to back settlements may not be possible.
The Fund may not be able to convert a foreign currency to U.S. dollars in time for the settlement of redemption requests. In the event that the Fund is not able to convert the foreign currency to U.S. dollars in time for settlement, which may occur as a result of the delays described above, the Fund may be required to liquidate certain investments and/or borrow money in order to fund such redemption. The liquidation of investments, if required, could be at disadvantageous prices or otherwise have an adverse impact on the Fund’s performance (e.g., by causing the Fund to overweight foreign currency denominated holdings and underweight other holdings which were sold to fund redemptions). In addition, the Fund will incur interest expense on any borrowings and the borrowings will cause the Fund to be leveraged, which may magnify gains and losses on its investments.
In certain emerging market countries, the marketability of investments may be limited due to the restricted opening hours of trading exchanges, and a relatively high proportion of market value may be concentrated in the hands of a relatively small number of investors. In addition, because certain emerging market countries’ trading exchanges on which the Fund’s portfolio securities may trade are open when the relevant exchanges are closed, the Fund may be subject to heightened risk associated with market movements. Trading volume may be lower on certain emerging market countries’ trading exchanges than on more developed securities markets and securities may be generally less liquid. The infrastructure for clearing, settlement and registration on the primary and secondary markets of certain emerging market countries are less developed than in certain other markets and under certain circumstances this may result in the Fund experiencing delays in settling and/or registering transactions in the markets in which it invests, particularly if the growth of foreign and domestic investment in certain emerging market countries places an undue burden on such investment infrastructure. Such delays could affect the speed with which the Fund can transmit redemption proceeds and may inhibit the initiation and realization of investment opportunities at optimum times.
Certain issuers in emerging market countries may utilize share blocking schemes. Share blocking refers to a practice, in certain foreign markets, where voting rights related to an issuer’s securities are predicated on these securities being blocked from trading at the custodian or sub-custodian level for a period of time around a shareholder meeting. These
restrictions have the effect of barring the purchase and sale of certain voting securities within a specified number of days before and, in certain instances, after a shareholder meeting where a vote of shareholders will be taken. Share blocking may prevent the Fund from buying or selling securities for a period of time. During the time that shares are blocked, trades in such securities will not settle. The blocking period can last up to several weeks. The process for having a blocking restriction lifted can be quite onerous with the particular requirements varying widely by country. In addition, in certain countries, the block cannot be removed. As a result of the ramifications of voting ballots in markets that allow share blocking, the Adviser, on behalf of the Fund, reserves the right to abstain from voting proxies in those markets.
Global Resources Fund | Emerging Market Issuers Risk, Corporate And Securities Laws Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Corporate and Securities Laws. Securities laws in emerging market countries are relatively new and unsettled and, consequently, there is a risk of rapid and unpredictable change in laws regarding foreign investment, securities regulation, title to securities and securityholders rights. Accordingly, foreign investors may be adversely affected by new or amended laws and regulations. In addition, the systems of corporate governance to which emerging market issuers are subject may be less advanced than those systems to which issuers located in more developed countries are subject, and therefore, securityholders of issuers located in emerging market countries may not receive many of the protections available to securityholders of issuers located in more developed countries. In circumstances where adequate laws and securityholders rights exist, it may not be possible to obtain swift and equitable enforcement of the law. In addition, the enforcement of systems of taxation at federal, regional and local levels in emerging market countries may be inconsistent and subject to sudden change. The Fund has limited rights and few practical remedies in emerging markets and the ability of U.S. authorities to bring enforcement actions in emerging markets may be limited.
Global Resources Fund | ESG Investing Strategy Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
ESG Investing Strategy Risk.  The Fund’s ESG strategy could cause it to perform differently compared to funds that do not have an ESG focus. The Fund’s ESG strategy may result in the Fund investing in securities or industry sectors that underperform other securities or underperform the market as a whole. The Fund is also subject to the risk that the companies represented in the Fund do not operate as expected when addressing ESG issues. Additionally, the valuation model used for identifying ESG companies may not perform as intended, which may adversely affect an investment in the Fund. Regulatory changes or interpretations regarding the definitions and/or use of ESG criteria could have a material adverse effect on the Fund’s ability to implement its ESG strategy.
Global Resources Fund | Foreign Currency Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Foreign Currency Risk. Because all or a portion of the income received by the Fund from its investments and/or the revenues received by the underlying issuer will generally be denominated in foreign currencies, the Fund’s exposure to foreign currencies and changes in the value of foreign currencies versus the U.S. dollar may result in reduced returns for the Fund, and the value of certain foreign currencies may be subject to a high degree of fluctuation. The Fund may also (directly or indirectly) incur costs in connection with conversions between U.S. dollars and foreign currencies.
Global Resources Fund | Foreign Securities Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Foreign Securities Risk. Investments in the securities of foreign issuers involve risks beyond those associated with investments in U.S. securities. These additional risks include greater market volatility, the availability of less reliable financial information, higher transactional and custody costs, taxation by foreign governments, decreased market liquidity and political instability. Because certain foreign securities markets may be limited in size, the activity of large traders may have an undue influence on the prices of securities that trade in such markets. The Fund invests in securities of issuers located in countries whose economies are heavily dependent upon trading with key partners. Any reduction in this trading may have an adverse impact on the Fund’s investments. Foreign market trading hours, clearance and settlement procedures, and holiday schedules may limit the Fund's ability to buy and sell securities.
Global Resources Fund | Global Resources Sector Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Global Resources Sector Risk. The Fund may be sensitive to, and its performance may depend to a greater extent on, the overall condition of the global resources sector. The Fund concentrates its investments (i.e., invests 25% or more of its total assets) in the securities of global resource companies and instruments that derive their value from global resources. The Fund may be subject to greater risks and market fluctuations than a fund whose portfolio has exposure to a broader range of sectors. The Fund may be susceptible to financial, economic, political or market events, as well as government regulation, impacting the global resources sectors (such as the energy and metals sectors). Precious metals and natural resources securities are at times volatile and there may be sharp fluctuations in prices, even during periods of rising prices.
Global Resources Fund | Market Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Market Risk. The prices of securities are subject to the risks associated with investing in the securities market, including general economic conditions, sudden and unpredictable drops in value, exchange trading suspensions and closures and public health risks. These risks may be magnified if certain social, political, economic and other conditions and events (such as natural disasters, epidemics and pandemics, terrorism, conflicts and social unrest) adversely interrupt the global economy; in these and other circumstances, such events or developments might affect companies world-wide. Overall securities values could decline generally or underperform other investments. An investment may lose money.
Global Resources Fund | Operational Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Operational Risk. The Fund is exposed to operational risk arising from a number of factors, including human error, processing and communication errors, errors of the Fund’s service providers, counterparties or other third-parties, failed or inadequate processes and technology or system failures.
Global Resources Fund | Risk Of Investing In Other Funds Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Risk of Investing in Other Funds. The Fund may invest in shares of other funds, including ETFs. As a result, the Fund will indirectly be exposed to the risks of an investment in the underlying funds. As a shareholder in a fund, the Fund would bear its
ratable share of that entity’s expenses. At the same time, the Fund would continue to pay its own investment management fees and other expenses. As a result, the Fund and its shareholders will be absorbing additional levels of fees with respect to investments in other funds, including ETFs.
Global Resources Fund | Special Risk Considerations Of Investing In Canadian Issuers Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Special Risk Considerations of Investing in Canadian Issuers. Investments in securities of Canadian issuers, including issuers located outside of Canada that generate significant revenue from Canada, involve risks and special considerations not typically associated with investments in the U.S. securities markets. The Canadian economy is very dependent on the demand for, and supply and price of, natural resources. The Canadian market is relatively concentrated in issuers involved in the production and distribution of natural resources. There is a risk that any changes in natural resources sectors could have an adverse impact on the Canadian economy. Additionally, the Canadian economy is heavily dependent on relationships with certain key trading partners, including the United States, countries in the European Union and China. Because the United States is Canada’s largest trading partner and foreign investor, the Canadian economy is dependent on and may be significantly affected by the U.S. economy. Reduction in spending on Canadian products and services or changes in the U.S. economy may adversely impact the Canadian economy. Trade agreements may further increase Canada’s dependency on the U.S. economy, and uncertainty as to the future of such trade agreements may cause a decline in the value of the Fund’s Shares. Past periodic demands by the Province of Quebec for sovereignty have significantly affected equity valuations and foreign currency movements in the Canadian market and such demands may have this effect in the future. In addition, certain sectors of Canada’s economy may be subject to foreign ownership limitations. This may negatively impact the Fund’s ability to invest in Canadian issuers and to pursue its investment objective.
Global Resources Fund | Small- And Medium-Capitalization Companies Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Small- and Medium-Capitalization Companies Risk. The Fund may invest in small- and medium-capitalization companies and, therefore will be subject to certain risks associated with small- and medium- capitalization companies. These companies are often subject to less analyst coverage and may be in early and less predictable periods of their corporate existences, with little or no record of profitability. In addition, these companies often have greater price volatility, lower trading volume and less liquidity than larger more established companies. These companies tend to have smaller revenues, narrower product lines, less management depth and experience, smaller shares of their product or service markets, fewer financial resources and less competitive strength than large-capitalization companies. Returns on investments in securities of small- and medium-capitalization companies could trail the returns on investments in securities of larger companies.
Global Resources Fund | Special Purpose Acquisition Companies Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Special Purpose Acquisition Companies Risk. Equity securities in which the Fund invests include stock, rights, warrants, and other interests in special purpose acquisition companies (“SPACs”) or similar special purpose entities. A SPAC is typically a publicly traded company that raises investment capital via an initial public offering for the purpose of acquiring one or more existing companies (or interests therein) via merger, combination, acquisition or other similar transactions. If the Fund purchases shares of a SPAC in an initial public offering it will generally bear a sales commission, which may be significant. The shares of a SPAC are often issued in “units” that include one share of common stock and one right or warrant (or partial right or warrant) conveying the right to purchase additional shares or partial shares. In some cases, the rights and warrants may be separated from the common stock at the election of the holder, after which they may become freely tradeable. After going public and until a transaction is completed, a SPAC generally invests the proceeds of its initial public offering (less a portion retained to cover expenses) in U.S. Government securities, money market securities and cash. To the extent the SPAC is invested in cash or similar securities, this may impact the Fund’s ability to meet its investment objective. If a SPAC does not complete a transaction within a specified period of time after going public, the SPAC is typically dissolved, at which point the invested funds are returned to the SPAC’s shareholders (less certain permitted expenses) and any rights or warrants issued by the SPAC expire worthless. SPACs generally provide their investors with the option of redeeming an investment in the SPAC at or around the time of effecting a transaction. In some cases, the Fund may forfeit its right to receive additional warrants or other interests in the SPAC if it redeems its interest in the SPAC in connection with a transaction. Because SPACs often do not have an operating history or ongoing business other than seeking a transaction, the value of their securities may be particularly dependent on the quality of its management and on the ability of the SPAC’s management to identify and complete a profitable transaction. Some SPACs may pursue transactions only within certain industries or regions, which may increase the volatility of an investment in them. In addition, the securities issued by a SPAC, which may be traded in the over-the-counter market, may become illiquid and/or may be subject to restrictions on resale. Other risks of investing in SPACs include that a significant portion of the monies raised by the SPAC may be expended during the search for a target transaction; an attractive transaction may not be identified at all (or any requisite approvals may not be obtained) and the SPAC may be required to return any remaining monies to shareholders; a transaction once identified or effected may prove unsuccessful and an investment in the SPAC may lose value; the warrants or other rights with respect to the SPAC held by the Fund may expire worthless or may be repurchased or retired by the SPAC at an unfavorable price; and an investment in a SPAC may be diluted by additional later offerings of interests in the SPAC or by other investors exercising existing rights to purchase shares of the SPAC.
Global Resources Fund | Class A  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol GHAAX
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice 5.75%
Maximum Deferred Sales Charge (as a percentage of Offering Price) rr_MaximumDeferredSalesChargeOverOfferingPrice none [4]
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 1.00%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.25%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.50%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.12%) [5]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 1.38%
Expenses Deferred Charges [Text Block] rr_ExpensesDeferredChargesTextBlock A contingent deferred sales charge for Class A shares of 1.00% for one year applies to redemptions of qualified commissionable shares purchased at or above the $1 million breakpoint level.
Expense Breakpoint Discounts [Text] rr_ExpenseBreakpointDiscounts You may qualify for Class A sales charge discounts if you and your family (includes spouse and children under age 21) invest, or agree to invest in the future, at least $25,000, in the aggregate, in Classes A and C of the VanEck Funds.
Expense Breakpoint, Minimum Investment Required [Amount] rr_ExpenseBreakpointMinimumInvestmentRequiredAmount $ 25,000
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 707
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 1,011
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 1,336
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 2,253
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 707
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 1,011
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 1,336
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 2,253
Annual Return 2014 rr_AnnualReturn2014 (19.41%)
Annual Return 2015 rr_AnnualReturn2015 (33.42%)
Annual Return 2016 rr_AnnualReturn2016 43.17%
Annual Return 2017 rr_AnnualReturn2017 (1.49%)
Annual Return 2018 rr_AnnualReturn2018 (29.35%)
Annual Return 2019 rr_AnnualReturn2019 11.64%
Annual Return 2020 rr_AnnualReturn2020 18.68%
Annual Return 2021 rr_AnnualReturn2021 18.61%
Annual Return 2022 rr_AnnualReturn2022 7.74%
Annual Return 2023 rr_AnnualReturn2023 (3.89%)
Label rr_AverageAnnualReturnLabel Before Taxes
1 Year rr_AverageAnnualReturnYear01 (9.42%)
5 Years rr_AverageAnnualReturnYear05 8.93%
10 Years rr_AverageAnnualReturnYear10 (1.97%)
Global Resources Fund | Class A | After Taxes on Distributions  
Prospectus [Line Items] rr_ProspectusLineItems  
Label rr_AverageAnnualReturnLabel After Taxes on Distributions1 [6]
1 Year rr_AverageAnnualReturnYear01 (9.92%) [6]
5 Years rr_AverageAnnualReturnYear05 8.54% [6]
10 Years rr_AverageAnnualReturnYear10 (2.16%) [6]
Global Resources Fund | Class A | After Taxes on Distributions and Sales  
Prospectus [Line Items] rr_ProspectusLineItems  
Label rr_AverageAnnualReturnLabel After Taxes on Distributions and Sale of Fund Shares
1 Year rr_AverageAnnualReturnYear01 (5.23%)
5 Years rr_AverageAnnualReturnYear05 7.05%
10 Years rr_AverageAnnualReturnYear10 (1.47%)
Global Resources Fund | Class C  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol GHACX
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage of Offering Price) rr_MaximumDeferredSalesChargeOverOfferingPrice 1.00%
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 1.00%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 1.00%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.50%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 2.50%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.30%) [5]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 2.20%
Expense Breakpoint Discounts [Text] rr_ExpenseBreakpointDiscounts You may qualify for Class A sales charge discounts if you and your family (includes spouse and children under age 21) invest, or agree to invest in the future, at least $25,000, in the aggregate, in Classes A and C of the VanEck Funds.
Expense Breakpoint, Minimum Investment Required [Amount] rr_ExpenseBreakpointMinimumInvestmentRequiredAmount $ 25,000
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 323
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 750
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 1,304
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 2,813
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 223
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 750
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 1,304
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 2,813
Label rr_AverageAnnualReturnLabel Before Taxes
1 Year rr_AverageAnnualReturnYear01 (5.60%)
5 Years rr_AverageAnnualReturnYear05 9.33%
10 Years rr_AverageAnnualReturnYear10 (2.17%)
Global Resources Fund | Class I  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol GHAIX
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage of Offering Price) rr_MaximumDeferredSalesChargeOverOfferingPrice none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 1.00%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.13%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.13%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.18%) [5]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 0.95%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 97
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 341
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 605
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 1,359
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 97
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 341
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 605
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 1,359
Label rr_AverageAnnualReturnLabel Before Taxes
1 Year rr_AverageAnnualReturnYear01 (3.47%)
5 Years rr_AverageAnnualReturnYear05 10.70%
10 Years rr_AverageAnnualReturnYear10 (0.98%)
Inception Date rr_AverageAnnualReturnInceptionDate May 01, 2006
Global Resources Fund | Class Y  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol GHAYX
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage of Offering Price) rr_MaximumDeferredSalesChargeOverOfferingPrice none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 1.00%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.16%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.16%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.03%) [5]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 1.13%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 115
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 366
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 635
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 1,406
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 115
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 366
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 635
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 1,406
Label rr_AverageAnnualReturnLabel Before Taxes
1 Year rr_AverageAnnualReturnYear01 (3.63%)
5 Years rr_AverageAnnualReturnYear05 10.50%
10 Years rr_AverageAnnualReturnYear10 (1.14%)
Inception Date rr_AverageAnnualReturnInceptionDate Apr. 30, 2010
International Investors Gold Fund  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk/Return [Heading] rr_RiskReturnHeading International Investors Gold Fund
Objective [Heading] rr_ObjectiveHeading INVESTMENT OBJECTIVE
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock
The International Investors Gold Fund seeks long-term capital appreciation by investing in common stocks of gold-mining companies. The Fund may take current income into consideration when choosing investments.
Expense [Heading] rr_ExpenseHeading FUND 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 pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the tables and examples below. You may qualify for Class A sales charge discounts if you and your family (includes spouse and children under age 21) invest, or agree to invest in the future, at least $25,000, in the aggregate, in Classes A and C of the VanEck Funds. More information about these and other discounts is available from your financial professional and in the “Shareholder Information-Sales Charges” section of this prospectus, in the “Availability of Discounts” section of the Fund’s SAI and, with respect to purchases of shares through specific intermediaries, in Appendix A to this prospectus, entitled “Intermediary Sales Charge Discounts and Waivers.”
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)
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination May 1, 2025
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 rate may indicate that the Fund pays 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% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 25.00%
Expense Example [Heading] rr_ExpenseExampleHeading EXPENSE EXAMPLE
Expense Example Narrative [Text Block] rr_ExpenseExampleNarrativeTextBlock
The following 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 either redeem all of your shares at the end of these periods or continue to hold them. The example also assumes that your investment has a 5% return each year and that the Fund’s operating expenses remain the same, and applies fee waivers and/or expense reimbursements, if any, for the periods indicated above under “Annual Fund Operating Expenses.” Although your actual expenses may be higher or lower, based on these assumptions, your costs would be:
Expense Example by, Year, Caption [Text] rr_ExpenseExampleByYearCaption Sold
Expense Example, No Redemption, By Year, Caption [Text] rr_ExpenseExampleNoRedemptionByYearCaption Held
Strategy [Heading] rr_StrategyHeading PRINCIPAL INVESTMENT STRATEGIES
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock
Under normal conditions, the Fund invests at least 80% of its net assets in securities of companies principally engaged in gold-related activities, instruments that derive their value from gold, gold coins and bullion. A company principally engaged in gold-related activities is one that derives at least 50% of its revenues from gold-related activities, including the exploration, mining or processing of or dealing in gold. The Fund concentrates its investments in the gold-mining industry and therefore invests 25% or more of its total assets in such industry. The Fund is considered to be “non-diversified” which means that it may invest a larger portion of its assets in a single issuer.
The Fund invests in securities of companies with economic ties to countries throughout the world, including the U.S. Under ordinary circumstances, the Fund will invest in securities of issuers from a number of different countries, which may include emerging market countries. The Fund may invest in non-U.S. dollar denominated securities, which are subject to fluctuations in currency exchange rates, and securities of companies of any capitalization range. The Fund primarily invests in companies that the portfolio manager believes represent value opportunities and/or that have growth potential within their market niche, through their ability to increase production capacity at reasonable cost or make gold discoveries around the world. The portfolio manager utilizes both a macro-economic examination of gold market themes and a fundamental analysis of prospective companies in the search for value and growth opportunities. The analysis of financially material risks and opportunities related to ESG (i.e. Environmental, Social and Governance) factors is a component of the overall investment process. ESG considerations can affect the Adviser’s fundamental assessment of a company or country.
The Fund may invest up to 25% of its net assets, as of the date of the investment, in gold and silver coins, gold, silver, platinum and palladium bullion and exchange-traded funds (“ETFs”) that invest primarily in such coins and bullion and derivatives on the foregoing. The Fund’s investments in coins and bullion will not earn income, and the sole source of return to the Fund from these investments will be from gains or losses realized on the sale of such investments.
The Fund may gain exposure to gold bullion and other metals by investing up to 25% of the Fund’s total assets in a wholly owned subsidiary of the Fund (the “Subsidiary”). The Subsidiary primarily invests in gold bullion, gold futures and other instruments that provide direct or indirect exposure to gold, including ETFs, and also may invest in silver, platinum and palladium bullion and futures. The Subsidiary (unlike the Fund) may invest without limitation in these investments. The Fund will “look-through” the Subsidiary to the Subsidiary’s underlying investments for determining compliance with the Fund’s investment policies. For tax reasons, it may be advantageous for the Fund to create and maintain its exposure to the commodity markets, in whole or in part, by investing in the Subsidiary. The portfolio of the Subsidiary is managed by the Adviser for the exclusive benefit of the Fund.
The Fund may use derivative instruments, such as structured notes, futures, options, warrants, currency forwards and swap agreements, to gain or hedge exposure. The Fund may invest up to 20% of its net assets in securities issued by other investment companies, including ETFs. The Fund may also invest in money market funds, but these investments are not subject to this limitation. The Fund may invest in ETFs to participate in, or gain exposure to, certain market sectors, or when direct investments in certain countries are not permitted or available.
Strategy Portfolio Concentration [Text] rr_StrategyPortfolioConcentration Under normal conditions, the Fund invests at least 80% of its net assets in securities of companies principally engaged in gold-related activities, instruments that derive their value from gold, gold coins and bullion.
Risk [Heading] rr_RiskHeading PRINCIPAL RISKS
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading PERFORMANCE
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock
The following chart and table provide some indication of the risks of investing in the Fund by showing changes in the Fund’s performance from year to year and by showing how the Fund’s average annual total returns compare with those of a broad measure of market performance and one or more other performance measures. The Fund’s past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future. The annual returns in the bar chart are for the Fund’s Class A shares and do not reflect sales loads. If sales loads were reflected, returns would be lower than those shown.
Additionally, large purchases and/or redemptions of shares of a class, relative to the amount of assets represented by the class, may cause the annual returns for each class to differ. Updated performance information for the Fund is available on the VanEck website at vaneck.com.
Performance Information Illustrates Variability of Returns [Text] rr_PerformanceInformationIllustratesVariabilityOfReturns The following chart and table provide some indication of the risks of investing in the Fund by showing changes in the Fund’s performance from year to year and by showing how the Fund’s average annual total returns compare with those of a broad measure of market performance and one or more other performance measures.
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress vaneck.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 CLASS A: Annual Total Returns (%) as of 12/31
Bar Chart Does Not Reflect Sales Loads [Text] rr_BarChartDoesNotReflectSalesLoads The annual returns in the bar chart are for the Fund’s Class A shares and do not reflect sales loads. If sales loads were reflected, returns would be lower than those shown.
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock
Best Quarter:+73.76%2Q 2020
Worst Quarter:-28.61%2Q 2022
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Best Quarter:
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Jun. 30, 2020
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 73.76%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Worst Quarter:
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Jun. 30, 2022
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (28.61%)
Performance Table Heading rr_PerformanceTableHeading Average Annual Total Returns as of 12/31/2023
Index No Deduction for Fees, Expenses, Taxes [Text] rr_IndexNoDeductionForFeesExpensesTaxes (reflects no deduction for fees, expenses or taxes, except withholding taxes)
Performance Table Uses Highest Federal Rate rr_PerformanceTableUsesHighestFederalRate After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes.
Performance Table Not Relevant to Tax Deferred rr_PerformanceTableNotRelevantToTaxDeferred The after-tax return information shown above does not apply to Fund shares held through a tax-advantaged account, such as a 401(k) plan or Investment Retirement Account.
Performance Table One Class of after Tax Shown [Text] rr_PerformanceTableOneClassOfAfterTaxShown These returns are shown for one class of shares only; after-tax returns for the other classes may vary.
Performance Table Closing [Text Block] rr_PerformanceTableClosingTextBlock
See “License Agreements and Disclaimers” for important information.
International Investors Gold Fund | NYSE Arca Gold Miners Index (reflects no deduction for fees, expenses or taxes, except withholding taxes)  
Prospectus [Line Items] rr_ProspectusLineItems  
Label rr_AverageAnnualReturnLabel NYSE Arca Gold Miners Index (reflects no deduction for fees, expenses or taxes, except withholding taxes)
1 Year rr_AverageAnnualReturnYear01 10.60%
5 Years rr_AverageAnnualReturnYear05 9.80%
10 Years rr_AverageAnnualReturnYear10 5.25%
International Investors Gold Fund | MSCI AC World Index (reflects no deduction for fees, expenses or taxes, except withholding taxes)  
Prospectus [Line Items] rr_ProspectusLineItems  
Label rr_AverageAnnualReturnLabel MSCI AC World Index (reflects no deduction for fees, expenses or taxes, except withholding taxes)
1 Year rr_AverageAnnualReturnYear01 22.20%
5 Years rr_AverageAnnualReturnYear05 11.72%
10 Years rr_AverageAnnualReturnYear10 7.93%
International Investors Gold Fund | Risk Nondiversified Status [Member]  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Non-Diversified Risk. The Fund is classified as a “non-diversified” fund under the Investment Company Act of 1940. The Fund is subject to the risk that it will be more volatile than a diversified fund because the Fund may invest a relatively high percentage of its assets in a smaller number of issuers or may invest a larger proportion of its assets in a single issuer. Moreover, the gains and
losses on a single investment may have a greater impact on the Fund’s net asset value and may make the Fund more volatile than more diversified funds. The Fund may be particularly vulnerable to this risk if it is comprised of a limited number of investments.
International Investors Gold Fund | Risk Lose Money [Member]  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock The Fund’s share price and return will fluctuate with changes in the market value of the Fund’s portfolio securities. Accordingly, an investment in the Fund involves the risk of losing money.
International Investors Gold Fund | Active Management Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Active Management Risk.  In managing the Fund’s portfolio, the Adviser will apply investment techniques and risk analyses in making investment decisions for the Fund, but there can be no guarantee that these will produce the desired results. Investment decisions made by the Adviser in seeking to achieve the Fund’s investment objective may cause a decline in the value of the investments held by the Fund and, in turn, cause the Fund’s shares to lose value or underperform other funds with similar investment objectives.
International Investors Gold Fund | Commodities And Commodity-Linked Instruments Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Commodities and Commodity-Linked Instruments Risk. Commodities include, among other things, energy products, agricultural products, industrial metals, precious metals and livestock. The commodities markets may fluctuate widely based on a variety of factors, including overall market movements, economic events and policies, changes in interest rates or inflation rates, changes in monetary and exchange control programs, war, acts of terrorism, natural disasters and technological developments. Variables such as disease, drought, floods, weather, trade, embargoes, tariffs and other political events, in particular, may have a larger impact on commodity prices than on traditional securities. These additional variables may create additional investment risks that subject the Fund’s investments to greater volatility than investments in traditional securities. The prices of commodities can also fluctuate widely due to supply and demand disruptions in major producing or consuming regions. Because certain commodities may be produced in a limited number of countries and may be controlled by a small number of producers, political, economic and supply-related events in such countries could have a disproportionate impact on the prices of such commodities. These factors may affect the value of the Fund’s investments in varying ways, and different factors may cause the values and the volatility of the Fund’s investments to move in inconsistent directions at inconsistent rates. Because the value of a commodity-linked derivative instrument and structured note typically are based upon the price movements of physical commodities, the value of these securities will rise or fall in response to changes in the underlying commodities or related index of investment.
International Investors Gold Fund | Commodities And Commodity-Linked Instruments Tax Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Commodities and Commodity-Linked Instruments Tax Risk. The tax treatment of commodity-linked derivative instruments may be adversely affected by changes in legislation, regulations or other legally binding authority. If, as a result of any such adverse action, the income of the Fund from certain commodity-linked derivatives were treated as non- qualifying income, the Fund might fail to qualify as a regulated investment company and/or be subject to federal income tax at the Fund level. The uncertainty surrounding the treatment of certain derivative instruments under the qualification tests for a regulated investment company may limit the Fund’s use of such derivative instruments.
The Fund may be required, for federal income tax purposes, to mark-to-market and recognize as income for each taxable year any net unrealized gains and losses on certain futures contracts and option contracts as of the end of the year as well as those actually realized during the year. Gain or loss from futures contracts required to be marked-to-market will be 60% long-term and 40% short-term capital gain or loss if held directly by the Fund, but if held by the Subsidiary, as is expected, such gains will be recognized as ordinary income by the Fund to the extent of the Subsidiary’s annual net earnings if any. Application of this rule may alter the timing and character of distributions to shareholders. The Fund may be required to defer the recognition of losses on futures contracts or certain option contracts to the extent of any unrecognized gains on related positions held by the Fund.
International Investors Gold Fund | Derivatives Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Derivatives Risk.  Derivatives and other similar instruments (referred to collectively as “derivatives”) are financial instruments whose values are based on the value of one or more reference assets or indicators, such as a security, currency, interest rate, or index. The Fund’s use of derivatives involves risks different from, and possibly greater than, the risks associated with investing directly in securities and other more traditional investments. Moreover, although the value of a derivative is based on an underlying asset or indicator, a derivative typically does not carry the same rights as would be the case if the Fund invested directly in the underlying securities, currencies or other assets.
Derivatives are subject to a number of risks, such as potential changes in value in response to market developments or, in the case of “over-the-counter” derivatives, as a result of a counterparty’s credit quality and the risk that a derivative transaction may not have the effect the Adviser anticipated. Derivatives also involve the risk of mispricing or improper valuation and the risk that changes in the value of a derivative may not achieve the desired correlation with the underlying asset or indicator. Derivative transactions can create investment leverage and may be highly volatile, and the Fund could lose more than the amount it invests. The use of derivatives may increase the amount and affect the timing and character of taxes payable by shareholders of the Fund.
Many derivative transactions are entered into “over-the-counter” without a central clearinghouse; as a result, the value of such a derivative transaction will depend on, among other factors, the ability and the willingness of the Fund’s counterparty to perform its obligations under the transaction. If a counterparty were to default on its obligations, the Fund’s contractual remedies against such counterparty may be subject to bankruptcy and insolvency laws, which could affect the Fund’s rights as a creditor (e.g., the Fund may not receive the net amount of payments that it is contractually entitled to receive). Counterparty risk also refers to the related risks of having concentrated exposure to such a counterparty. A liquid secondary market may not always exist for the Fund’s derivative positions at any time, and the Fund may not be able to initiate or liquidate a swap position at an advantageous time or price, which may result in significant losses. The Fund may also face the risk that it may not be able to meet margin and payment requirements and maintain a derivatives position.
Derivatives are also subject to operational and legal risks. Operational risk generally refers to risk related to potential operational issues, including documentation issues, settlement issues, system failures, inadequate controls, and human errors. Legal risk generally refers to insufficient documentation, insufficient capacity or authority of counterparty, or legality or enforceability of a contract.
International Investors Gold Fund | Direct Investments Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Direct Investments Risk. Direct investments may involve a high degree of business and financial risk that can result in substantial losses. Because of the absence of any public trading market for these investments, the Fund may take longer to liquidate these positions than would be the case for publicly traded securities. Direct investments are generally considered illiquid and will be aggregated with other illiquid investments for purposes of the Fund's limitation on illiquid investments.
International Investors Gold Fund | Emerging Market Issuers Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Emerging Market Issuers Risk. Investments in securities of emerging market issuers involve risks not typically associated with investments in securities of issuers in more developed countries that may negatively affect the value of your investment in the Fund. Such heightened risks may include, among others, expropriation and/or nationalization of assets, restrictions on and government intervention in international trade, confiscatory taxation, political instability, including authoritarian and/or military involvement in governmental decision making, armed conflict, the impact on the economy as a result of civil war, crime (including drug violence) and social instability as a result of religious, ethnic and/or socioeconomic unrest. Issuers in certain emerging market countries are subject to less stringent requirements regarding accounting, auditing, financial reporting and record keeping than are issuers in more developed markets, and therefore, all material information may not be available or reliable. Emerging markets are also more likely than developed markets to experience problems with the clearing and settling of trades, as well as the holding of securities by local banks, agents and depositories. Low trading volumes and volatile prices in less developed markets may make trades harder to complete and settle, and governments or trade groups may compel local agents to hold securities in designated depositories that may not be subject to independent evaluation. Local agents are held only to the standards of care of their local markets. In general, the less developed a country’s securities markets are, the greater the likelihood of custody problems. Additionally, each of the factors described below could have a negative impact on the Fund’s performance and increase the volatility of the Fund.
Securities Markets. Securities markets in emerging market countries are underdeveloped and are often considered to be less correlated to global economic cycles than those markets located in more developed countries. Securities markets in emerging market countries are subject to greater risks associated with market volatility, lower market capitalization, lower trading volume, illiquidity, inflation, greater price fluctuations, uncertainty regarding the existence of trading markets, governmental control and heavy regulation of labor and industry. These factors, coupled with restrictions on foreign investment and other factors, limit the supply of securities available for investment by the Fund. This will affect the rate at which the Fund is able to invest in emerging market countries, the purchase and sale prices for such securities and the timing of purchases and sales. Emerging markets can experience high rates of inflation, deflation and currency devaluation. The prices of certain securities listed on securities markets in emerging market countries have been subject to sharp fluctuations and sudden declines, and no assurance can be given as to the future performance of listed securities in general. Volatility of prices may be greater than in more developed securities markets. Moreover, securities markets in emerging market countries may be closed for extended periods of time or trading on securities markets may be suspended altogether due to political or civil unrest. Market volatility may also be heightened by the actions of a small number of investors. Brokerage firms in emerging market countries may be fewer in number and less established than brokerage firms in more developed markets. Since the Fund may need to effect securities transactions through these brokerage firms, the Fund is subject to the risk that these brokerage firms will not be able to fulfill their obligations to the Fund. This risk is magnified to the extent the Fund effects securities transactions through a single brokerage firm or a small number of brokerage firms. In addition, the infrastructure for the safe custody of securities and for purchasing and selling securities, settling trades, collecting dividends, initiating corporate actions, and following corporate activity is not as well developed in emerging market countries as is the case in certain more developed markets.
Political and Economic Risk. Certain emerging market countries have historically been subject to political instability and their prospects are tied to the continuation of economic and political liberalization in the region. Instability may result from factors such as government or military intervention in decision making, terrorism, civil unrest, extremism or hostilities between neighboring countries. Any of these factors, including an outbreak of hostilities could negatively impact the Fund’s returns. Limited political and democratic freedoms in emerging market countries might cause significant social unrest. These factors may have a significant adverse effect on an emerging market country’s economy.
Many emerging market countries may be heavily dependent upon international trade and, consequently, may continue to be negatively affected by trade barriers, exchange controls, managed adjustments in relative currency values and other protectionist measures imposed or negotiated by the countries with which it trades. They also have been, and may continue to be, adversely affected by economic conditions in the countries with which they trade.
In addition, commodities (such as oil, gas and minerals) represent a significant percentage of certain emerging market countries’ exports and these economies are particularly sensitive to fluctuations in commodity prices. Adverse economic events in one country may have a significant adverse effect on other countries of this region. In addition, most emerging market countries have experienced, at one time or another, severe and persistent levels of inflation, including, in some cases, hyperinflation. This has, in turn, led to high interest rates, extreme measures by governments to keep inflation in check, and a generally debilitating effect on economic growth.
Although inflation in many countries has lessened, there is no guarantee it will remain at lower levels. The political history of certain emerging market countries has been characterized by political uncertainty, intervention by the military in civilian
and economic spheres, and political corruption. Such events could reverse favorable trends toward market and economic reform, privatization, and removal of trade barriers, and result in significant disruption in securities markets in the region.
Also, from time to time, certain issuers located in emerging market countries in which the Fund invests may operate in, or have dealings with, countries subject to sanctions and/or embargoes imposed by the U.S. Government and the United Nations and/or countries identified by the U.S. Government as state sponsors of terrorism. As a result, an issuer may sustain damage to its reputation if it is identified as an issuer which operates in, or has dealings with, such countries. The Fund, as an investor in such issuers, will be indirectly subject to those risks.
The economies of one or more countries in which the Fund may invest may be in various states of transition from a planned economy to a more market oriented economy. The economies of such countries differ from the economies of most developed countries in many respects, including levels of government involvement, states of development, growth rates, control of foreign exchange and allocation of resources. Economic growth in these economies may be uneven both geographically and among various sectors of their economies and may also be accompanied by periods of high inflation. Political changes, social instability and adverse diplomatic developments in these countries could result in the imposition of additional government restrictions, including expropriation of assets, confiscatory taxes or nationalization of some or all of the property held by the underlying issuers of securities of emerging market issuers. There is no guarantee that the governments of these countries will not revert back to some form of planned or non-market oriented economy, and such governments continue to be active participants in many economic sectors through ownership positions and regulation. The allocation of resources in such countries is subject to a high level of government control. Such countries’ governments may strictly regulate the payment of foreign currency denominated obligations and set monetary policy. Through their policies, these governments may provide preferential treatment to particular industries or companies. The policies set by the government of one of these countries could have a substantial effect on that country’s economy.
Investment and Repatriation Restrictions. The government in an emerging market country may restrict or control to varying degrees the ability of foreign investors to invest in securities of issuers located or operating in such emerging market countries. These restrictions and/or controls may at times limit or prevent foreign investment in securities of issuers located or operating in emerging market countries and may inhibit the Fund’s ability to meet its investment objective. In addition, the Fund may not be able to buy or sell securities or receive full value for such securities. Moreover, certain emerging market countries may require governmental approval or special licenses prior to investments by foreign investors and may limit the amount of investments by foreign investors in a particular industry and/or issuer; may limit such foreign investment to a certain class of securities of an issuer that may have less advantageous rights than the classes available for purchase by domiciliaries of such emerging market countries; and/or may impose additional taxes on foreign investors. A delay in obtaining a required government approval or a license would delay investments in those emerging market countries, and, as a result, the Fund may not be able to invest in certain securities while approval is pending. The government of certain emerging market countries may also withdraw or decline to renew a license that enables the Fund to invest in such country. These factors make investing in issuers located or operating in emerging market countries significantly riskier than investing in issuers located or operating in more developed countries, and any one of them could cause a decline in the net asset value of the Fund.
Additionally, investments in issuers located in certain emerging market countries may be subject to a greater degree of risk associated with governmental approval in connection with the repatriation of investment income, capital or the proceeds of sales of securities by foreign investors. Moreover, there is the risk that if the balance of payments in an emerging market country declines, the government of such country may impose temporary restrictions on foreign capital remittances. Consequently, the Fund could be adversely affected by delays in, or a refusal to grant, required governmental approval for repatriation of capital, as well as by the application to the Fund of any restrictions on investments. Furthermore, investments in emerging market countries may require the Fund to adopt special procedures, seek local government approvals or take other actions, each of which may involve additional costs to the Fund.
Available Disclosure About Emerging Market Issuers. Issuers located or operating in emerging market countries are not subject to the same rules and regulations as issuers located or operating in more developed countries. Therefore, there may be less financial and other information publicly available with regard to issuers located or operating in emerging market countries and such issuers are not subject to the uniform accounting, auditing and financial reporting standards applicable to issuers located or operating in more developed countries.
Foreign Currency Considerations. The Fund’s assets that are invested in securities of issuers in emerging market countries will generally be denominated in foreign currencies, and the proceeds received by the Fund from these investments will be principally in foreign currencies. The value of an emerging market country’s currency may be subject to a high degree of fluctuation. This fluctuation may be due to changes in interest rates, the effects of monetary policies issued by the United States, foreign governments, central banks or supranational entities, the imposition of currency controls or other national or global political or economic developments. The economies of certain emerging market countries can be significantly affected by currency devaluations. Certain emerging market countries may also have
managed currencies which are maintained at artificial levels relative to the U.S. dollar rather than at levels determined by the market. This type of system can lead to sudden and large adjustments in the currency which, in turn, can have a disruptive and negative effect on foreign investors.
The Fund’s exposure to an emerging market country’s currency and changes in value of such foreign currencies versus the U.S. dollar may reduce the Fund’s investment performance and the value of your investment in the Fund. Meanwhile, the Fund will compute and expects to distribute its income in U.S. dollars, and the computation of income will be made on the date that the income is earned by the Fund at the foreign exchange rate in effect on that date. Therefore, if the value of the respective emerging market country’s currency falls relative to the U.S. dollar between the earning of the income and the time at which the Fund converts the relevant emerging market country’s currency to U.S. dollars, the Fund may be required to liquidate certain positions in order to make distributions if the Fund has insufficient cash in U.S. dollars to meet distribution requirements under the Internal Revenue Code. The liquidation of investments, if required, could be at disadvantageous prices or otherwise have an adverse impact on the Fund’s performance.
Certain emerging market countries also restrict the free conversion of their currency into foreign currencies, including the U.S. dollar. There is no significant foreign exchange market for many such currencies and it would, as a result, be difficult for the Fund to engage in foreign currency transactions designed to protect the value of the Fund’s interests in securities denominated in such currencies. Furthermore, if permitted, the Fund may incur costs in connection with conversions between U.S. dollars and an emerging market country’s currency. Foreign exchange dealers realize a profit based on the difference between the prices at which they are buying and selling various currencies. Thus, a dealer normally will offer to sell a foreign currency to the Fund at one rate, while offering a lesser rate of exchange should the Fund desire immediately to resell that currency to the dealer. The Fund will conduct its foreign currency exchange transactions either on a spot (i.e., cash) basis at the spot rate prevailing in the foreign currency exchange market, or through entering into forward, futures or options contracts to purchase or sell foreign currencies.
Operational and Settlement Risk. In addition to having less developed securities markets, emerging market countries have less developed custody and settlement practices than certain developed countries. Rules adopted under the Investment Company Act of 1940 permit the Fund to maintain its foreign securities and cash in the custody of certain eligible non-U.S. banks and securities depositories. Banks in emerging market countries that are eligible foreign sub-custodians may be recently organized or otherwise lack extensive operating experience. In addition, in certain emerging market countries there may be legal restrictions or limitations on the ability of the Fund to recover assets held in custody by a foreign sub-custodian in the event of the bankruptcy of the sub-custodian. Because settlement systems in emerging market countries may be less organized than in other developed markets, there may be a risk that settlement may be delayed and that cash or securities of the Fund may be in jeopardy because of failures of or defects in the systems. Under the laws in many emerging market countries, the Fund may be required to release local shares before receiving cash payment or may be required to make cash payment prior to receiving local shares, creating a risk that the Fund may surrender cash or securities without ever receiving securities or cash from the other party. Settlement systems in emerging market countries also have a higher risk of failed trades and back to back settlements may not be possible.
The Fund may not be able to convert a foreign currency to U.S. dollars in time for the settlement of redemption requests. In the event that the Fund is not able to convert the foreign currency to U.S. dollars in time for settlement, which may occur as a result of the delays described above, the Fund may be required to liquidate certain investments and/or borrow money in order to fund such redemption. The liquidation of investments, if required, could be at disadvantageous prices or otherwise have an adverse impact on the Fund’s performance (e.g., by causing the Fund to overweight foreign currency denominated holdings and underweight other holdings which were sold to fund redemptions). In addition, the Fund will incur interest expense on any borrowings and the borrowings will cause the Fund to be leveraged, which may magnify gains and losses on its investments.
In certain emerging market countries, the marketability of investments may be limited due to the restricted opening hours of trading exchanges, and a relatively high proportion of market value may be concentrated in the hands of a relatively small number of investors. In addition, because certain emerging market countries’ trading exchanges on which the Fund’s portfolio securities may trade are open when the relevant exchanges are closed, the Fund may be subject to heightened risk associated with market movements. Trading volume may be lower on certain emerging market countries’ trading exchanges than on more developed securities markets and securities may be generally less liquid. The infrastructure for clearing, settlement and registration on the primary and secondary markets of certain emerging market countries are less developed than in certain other markets and under certain circumstances this may result in the Fund experiencing delays in settling and/or registering transactions in the markets in which it invests, particularly if the growth of foreign and domestic investment in certain emerging market countries places an undue burden on such investment infrastructure. Such delays could affect the speed with which the Fund can transmit redemption proceeds and may inhibit the initiation and realization of investment opportunities at optimum times.
Certain issuers in emerging market countries may utilize share blocking schemes. Share blocking refers to a practice, in certain foreign markets, where voting rights related to an issuer’s securities are predicated on these securities being
blocked from trading at the custodian or sub-custodian level for a period of time around a shareholder meeting. These restrictions have the effect of barring the purchase and sale of certain voting securities within a specified number of days before and, in certain instances, after a shareholder meeting where a vote of shareholders will be taken. Share blocking may prevent the Fund from buying or selling securities for a period of time. During the time that shares are blocked, trades in such securities will not settle. The blocking period can last up to several weeks. The process for having a blocking restriction lifted can be quite onerous with the particular requirements varying widely by country. In addition, in certain countries, the block cannot be removed. As a result of the ramifications of voting ballots in markets that allow share blocking, the Adviser, on behalf of the Fund, reserves the right to abstain from voting proxies in those markets.
Corporate and Securities Laws. Securities laws in emerging market countries are relatively new and unsettled and, consequently, there is a risk of rapid and unpredictable change in laws regarding foreign investment, securities regulation, title to securities and securityholders rights. Accordingly, foreign investors may be adversely affected by new or amended laws and regulations. In addition, the systems of corporate governance to which emerging market issuers are subject may be less advanced than those systems to which issuers located in more developed countries are subject, and therefore, securityholders of issuers located in emerging market countries may not receive many of the protections available to securityholders of issuers located in more developed countries. In circumstances where adequate laws and securityholders rights exist, it may not be possible to obtain swift and equitable enforcement of the law. In addition, the enforcement of systems of taxation at federal, regional and local levels in emerging market countries may be inconsistent and subject to sudden change. The Fund has limited rights and few practical remedies in emerging markets and the ability of U.S. authorities to bring enforcement actions in emerging markets may be limited.
International Investors Gold Fund | Emerging Market Issuers Risk, Securities Markets Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Securities Markets. Securities markets in emerging market countries are underdeveloped and are often considered to be less correlated to global economic cycles than those markets located in more developed countries. Securities markets in emerging market countries are subject to greater risks associated with market volatility, lower market capitalization, lower trading volume, illiquidity, inflation, greater price fluctuations, uncertainty regarding the existence of trading markets, governmental control and heavy regulation of labor and industry. These factors, coupled with restrictions on foreign investment and other factors, limit the supply of securities available for investment by the Fund. This will affect the rate at which the Fund is able to invest in emerging market countries, the purchase and sale prices for such securities and the timing of purchases and sales. Emerging markets can experience high rates of inflation, deflation and currency devaluation. The prices of certain securities listed on securities markets in emerging market countries have been subject to sharp fluctuations and sudden declines, and no assurance can be given as to the future performance of listed securities in general. Volatility of prices may be greater than in more developed securities markets. Moreover, securities markets in emerging market countries may be closed for extended periods of time or trading on securities markets may be suspended altogether due to political or civil unrest. Market volatility may also be heightened by the actions of a small number of investors. Brokerage firms in emerging market countries may be fewer in number and less established than brokerage firms in more developed markets. Since the Fund may need to effect securities transactions through these brokerage firms, the Fund is subject to the risk that these brokerage firms will not be able to fulfill their obligations to the Fund. This risk is magnified to the extent the Fund effects securities transactions through a single brokerage firm or a small number of brokerage firms. In addition, the infrastructure for the safe custody of securities and for purchasing and selling securities, settling trades, collecting dividends, initiating corporate actions, and following corporate activity is not as well developed in emerging market countries as is the case in certain more developed markets.
International Investors Gold Fund | Emerging Market Issuers Risk, Political And Economic Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Political and Economic Risk. Certain emerging market countries have historically been subject to political instability and their prospects are tied to the continuation of economic and political liberalization in the region. Instability may result from factors such as government or military intervention in decision making, terrorism, civil unrest, extremism or hostilities between neighboring countries. Any of these factors, including an outbreak of hostilities could negatively impact the Fund’s returns. Limited political and democratic freedoms in emerging market countries might cause significant social unrest. These factors may have a significant adverse effect on an emerging market country’s economy.
Many emerging market countries may be heavily dependent upon international trade and, consequently, may continue to be negatively affected by trade barriers, exchange controls, managed adjustments in relative currency values and other protectionist measures imposed or negotiated by the countries with which it trades. They also have been, and may continue to be, adversely affected by economic conditions in the countries with which they trade.
In addition, commodities (such as oil, gas and minerals) represent a significant percentage of certain emerging market countries’ exports and these economies are particularly sensitive to fluctuations in commodity prices. Adverse economic events in one country may have a significant adverse effect on other countries of this region. In addition, most emerging market countries have experienced, at one time or another, severe and persistent levels of inflation, including, in some cases, hyperinflation. This has, in turn, led to high interest rates, extreme measures by governments to keep inflation in check, and a generally debilitating effect on economic growth.
Although inflation in many countries has lessened, there is no guarantee it will remain at lower levels. The political history of certain emerging market countries has been characterized by political uncertainty, intervention by the military in civilian
and economic spheres, and political corruption. Such events could reverse favorable trends toward market and economic reform, privatization, and removal of trade barriers, and result in significant disruption in securities markets in the region.
Also, from time to time, certain issuers located in emerging market countries in which the Fund invests may operate in, or have dealings with, countries subject to sanctions and/or embargoes imposed by the U.S. Government and the United Nations and/or countries identified by the U.S. Government as state sponsors of terrorism. As a result, an issuer may sustain damage to its reputation if it is identified as an issuer which operates in, or has dealings with, such countries. The Fund, as an investor in such issuers, will be indirectly subject to those risks.
The economies of one or more countries in which the Fund may invest may be in various states of transition from a planned economy to a more market oriented economy. The economies of such countries differ from the economies of most developed countries in many respects, including levels of government involvement, states of development, growth rates, control of foreign exchange and allocation of resources. Economic growth in these economies may be uneven both geographically and among various sectors of their economies and may also be accompanied by periods of high inflation. Political changes, social instability and adverse diplomatic developments in these countries could result in the imposition of additional government restrictions, including expropriation of assets, confiscatory taxes or nationalization of some or all of the property held by the underlying issuers of securities of emerging market issuers. There is no guarantee that the governments of these countries will not revert back to some form of planned or non-market oriented economy, and such governments continue to be active participants in many economic sectors through ownership positions and regulation. The allocation of resources in such countries is subject to a high level of government control. Such countries’ governments may strictly regulate the payment of foreign currency denominated obligations and set monetary policy. Through their policies, these governments may provide preferential treatment to particular industries or companies. The policies set by the government of one of these countries could have a substantial effect on that country’s economy.
International Investors Gold Fund | Emerging Market Issuers Risk, Investment And Repatriation Restrictions Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Investment and Repatriation Restrictions. The government in an emerging market country may restrict or control to varying degrees the ability of foreign investors to invest in securities of issuers located or operating in such emerging market countries. These restrictions and/or controls may at times limit or prevent foreign investment in securities of issuers located or operating in emerging market countries and may inhibit the Fund’s ability to meet its investment objective. In addition, the Fund may not be able to buy or sell securities or receive full value for such securities. Moreover, certain emerging market countries may require governmental approval or special licenses prior to investments by foreign investors and may limit the amount of investments by foreign investors in a particular industry and/or issuer; may limit such foreign investment to a certain class of securities of an issuer that may have less advantageous rights than the classes available for purchase by domiciliaries of such emerging market countries; and/or may impose additional taxes on foreign investors. A delay in obtaining a required government approval or a license would delay investments in those emerging market countries, and, as a result, the Fund may not be able to invest in certain securities while approval is pending. The government of certain emerging market countries may also withdraw or decline to renew a license that enables the Fund to invest in such country. These factors make investing in issuers located or operating in emerging market countries significantly riskier than investing in issuers located or operating in more developed countries, and any one of them could cause a decline in the net asset value of the Fund.
Additionally, investments in issuers located in certain emerging market countries may be subject to a greater degree of risk associated with governmental approval in connection with the repatriation of investment income, capital or the proceeds of sales of securities by foreign investors. Moreover, there is the risk that if the balance of payments in an emerging market country declines, the government of such country may impose temporary restrictions on foreign capital remittances. Consequently, the Fund could be adversely affected by delays in, or a refusal to grant, required governmental approval for repatriation of capital, as well as by the application to the Fund of any restrictions on investments. Furthermore, investments in emerging market countries may require the Fund to adopt special procedures, seek local government approvals or take other actions, each of which may involve additional costs to the Fund.
International Investors Gold Fund | Emerging Market Issuers Risk, Available Disclosure About Emerging Market Issuers Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Available Disclosure About Emerging Market Issuers. Issuers located or operating in emerging market countries are not subject to the same rules and regulations as issuers located or operating in more developed countries. Therefore, there may be less financial and other information publicly available with regard to issuers located or operating in emerging market countries and such issuers are not subject to the uniform accounting, auditing and financial reporting standards applicable to issuers located or operating in more developed countries.
International Investors Gold Fund | Emerging Market Issuers Risk, Foreign Currency Considerations Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Foreign Currency Considerations. The Fund’s assets that are invested in securities of issuers in emerging market countries will generally be denominated in foreign currencies, and the proceeds received by the Fund from these investments will be principally in foreign currencies. The value of an emerging market country’s currency may be subject to a high degree of fluctuation. This fluctuation may be due to changes in interest rates, the effects of monetary policies issued by the United States, foreign governments, central banks or supranational entities, the imposition of currency controls or other national or global political or economic developments. The economies of certain emerging market countries can be significantly affected by currency devaluations. Certain emerging market countries may also have
managed currencies which are maintained at artificial levels relative to the U.S. dollar rather than at levels determined by the market. This type of system can lead to sudden and large adjustments in the currency which, in turn, can have a disruptive and negative effect on foreign investors.
The Fund’s exposure to an emerging market country’s currency and changes in value of such foreign currencies versus the U.S. dollar may reduce the Fund’s investment performance and the value of your investment in the Fund. Meanwhile, the Fund will compute and expects to distribute its income in U.S. dollars, and the computation of income will be made on the date that the income is earned by the Fund at the foreign exchange rate in effect on that date. Therefore, if the value of the respective emerging market country’s currency falls relative to the U.S. dollar between the earning of the income and the time at which the Fund converts the relevant emerging market country’s currency to U.S. dollars, the Fund may be required to liquidate certain positions in order to make distributions if the Fund has insufficient cash in U.S. dollars to meet distribution requirements under the Internal Revenue Code. The liquidation of investments, if required, could be at disadvantageous prices or otherwise have an adverse impact on the Fund’s performance.
Certain emerging market countries also restrict the free conversion of their currency into foreign currencies, including the U.S. dollar. There is no significant foreign exchange market for many such currencies and it would, as a result, be difficult for the Fund to engage in foreign currency transactions designed to protect the value of the Fund’s interests in securities denominated in such currencies. Furthermore, if permitted, the Fund may incur costs in connection with conversions between U.S. dollars and an emerging market country’s currency. Foreign exchange dealers realize a profit based on the difference between the prices at which they are buying and selling various currencies. Thus, a dealer normally will offer to sell a foreign currency to the Fund at one rate, while offering a lesser rate of exchange should the Fund desire immediately to resell that currency to the dealer. The Fund will conduct its foreign currency exchange transactions either on a spot (i.e., cash) basis at the spot rate prevailing in the foreign currency exchange market, or through entering into forward, futures or options contracts to purchase or sell foreign currencies.
International Investors Gold Fund | Emerging Market Issuers Risk, Operational And Settlement Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Operational and Settlement Risk. In addition to having less developed securities markets, emerging market countries have less developed custody and settlement practices than certain developed countries. Rules adopted under the Investment Company Act of 1940 permit the Fund to maintain its foreign securities and cash in the custody of certain eligible non-U.S. banks and securities depositories. Banks in emerging market countries that are eligible foreign sub-custodians may be recently organized or otherwise lack extensive operating experience. In addition, in certain emerging market countries there may be legal restrictions or limitations on the ability of the Fund to recover assets held in custody by a foreign sub-custodian in the event of the bankruptcy of the sub-custodian. Because settlement systems in emerging market countries may be less organized than in other developed markets, there may be a risk that settlement may be delayed and that cash or securities of the Fund may be in jeopardy because of failures of or defects in the systems. Under the laws in many emerging market countries, the Fund may be required to release local shares before receiving cash payment or may be required to make cash payment prior to receiving local shares, creating a risk that the Fund may surrender cash or securities without ever receiving securities or cash from the other party. Settlement systems in emerging market countries also have a higher risk of failed trades and back to back settlements may not be possible.
The Fund may not be able to convert a foreign currency to U.S. dollars in time for the settlement of redemption requests. In the event that the Fund is not able to convert the foreign currency to U.S. dollars in time for settlement, which may occur as a result of the delays described above, the Fund may be required to liquidate certain investments and/or borrow money in order to fund such redemption. The liquidation of investments, if required, could be at disadvantageous prices or otherwise have an adverse impact on the Fund’s performance (e.g., by causing the Fund to overweight foreign currency denominated holdings and underweight other holdings which were sold to fund redemptions). In addition, the Fund will incur interest expense on any borrowings and the borrowings will cause the Fund to be leveraged, which may magnify gains and losses on its investments.
In certain emerging market countries, the marketability of investments may be limited due to the restricted opening hours of trading exchanges, and a relatively high proportion of market value may be concentrated in the hands of a relatively small number of investors. In addition, because certain emerging market countries’ trading exchanges on which the Fund’s portfolio securities may trade are open when the relevant exchanges are closed, the Fund may be subject to heightened risk associated with market movements. Trading volume may be lower on certain emerging market countries’ trading exchanges than on more developed securities markets and securities may be generally less liquid. The infrastructure for clearing, settlement and registration on the primary and secondary markets of certain emerging market countries are less developed than in certain other markets and under certain circumstances this may result in the Fund experiencing delays in settling and/or registering transactions in the markets in which it invests, particularly if the growth of foreign and domestic investment in certain emerging market countries places an undue burden on such investment infrastructure. Such delays could affect the speed with which the Fund can transmit redemption proceeds and may inhibit the initiation and realization of investment opportunities at optimum times.
Certain issuers in emerging market countries may utilize share blocking schemes. Share blocking refers to a practice, in certain foreign markets, where voting rights related to an issuer’s securities are predicated on these securities being
blocked from trading at the custodian or sub-custodian level for a period of time around a shareholder meeting. These restrictions have the effect of barring the purchase and sale of certain voting securities within a specified number of days before and, in certain instances, after a shareholder meeting where a vote of shareholders will be taken. Share blocking may prevent the Fund from buying or selling securities for a period of time. During the time that shares are blocked, trades in such securities will not settle. The blocking period can last up to several weeks. The process for having a blocking restriction lifted can be quite onerous with the particular requirements varying widely by country. In addition, in certain countries, the block cannot be removed. As a result of the ramifications of voting ballots in markets that allow share blocking, the Adviser, on behalf of the Fund, reserves the right to abstain from voting proxies in those markets.
International Investors Gold Fund | Emerging Market Issuers Risk, Corporate And Securities Laws Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Corporate and Securities Laws. Securities laws in emerging market countries are relatively new and unsettled and, consequently, there is a risk of rapid and unpredictable change in laws regarding foreign investment, securities regulation, title to securities and securityholders rights. Accordingly, foreign investors may be adversely affected by new or amended laws and regulations. In addition, the systems of corporate governance to which emerging market issuers are subject may be less advanced than those systems to which issuers located in more developed countries are subject, and therefore, securityholders of issuers located in emerging market countries may not receive many of the protections available to securityholders of issuers located in more developed countries. In circumstances where adequate laws and securityholders rights exist, it may not be possible to obtain swift and equitable enforcement of the law. In addition, the enforcement of systems of taxation at federal, regional and local levels in emerging market countries may be inconsistent and subject to sudden change. The Fund has limited rights and few practical remedies in emerging markets and the ability of U.S. authorities to bring enforcement actions in emerging markets may be limited.
International Investors Gold Fund | ESG Investing Strategy Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
ESG Investing Strategy Risk.  The Fund’s ESG strategy could cause it to perform differently compared to funds that do not have an ESG focus. The Fund’s ESG strategy may result in the Fund investing in securities or industry sectors that underperform other securities or underperform the market as a whole. The Fund is also subject to the risk that the companies represented in the Fund do not operate as expected when addressing ESG issues. Additionally, the valuation model used for identifying ESG companies may not perform as intended, which may adversely affect an investment in the Fund. Regulatory changes or interpretations regarding the definitions and/or use of ESG criteria could have a material adverse effect on the Fund’s ability to implement its ESG strategy.
International Investors Gold Fund | Foreign Currency Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Foreign Currency Risk. Because all or a portion of the income received by the Fund from its investments and/or the revenues received by the underlying issuer will generally be denominated in foreign currencies, the Fund’s exposure to foreign currencies and changes in the value of foreign currencies versus the U.S. dollar may result in reduced returns for the Fund, and the value of certain foreign currencies may be subject to a high degree of fluctuation. The Fund may also (directly or indirectly) incur costs in connection with conversions between U.S. dollars and foreign currencies.
International Investors Gold Fund | Foreign Securities Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock Foreign Securities Risk. Investments in the securities of foreign issuers involve risks beyond those associated with investments in U.S. securities. These additional risks include greater market volatility, the availability of less reliable financial information, higher transactional and custody costs, taxation by foreign governments, decreased market liquidity and political instability. Because certain foreign securities markets may be limited in size, the activity of large traders may have an undue influence on the prices of securities that trade in such markets. The Fund invests in securities of issuers located in countries whose economies are heavily dependent upon trading with key partners. Any reduction in this trading may have an adverse impact on the Fund’s investments. Foreign market trading hours, clearance and settlement procedures, and holiday schedules may limit the Fund's ability to buy and sell securities.
International Investors Gold Fund | Gold And Silver Mining Companies Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Gold and Silver Mining Companies Risk. The Fund invests in stocks and depositary receipts of U.S. and foreign companies that are involved in the gold mining and silver mining industries, which are considered speculative and are affected by a variety of factors. Competitive pressures may have a significant effect on the financial condition of gold mining and silver mining companies. Also, gold and silver mining companies are highly dependent on the price of gold bullion and silver bullion, respectively, but may also be adversely affected by a variety of worldwide economic, financial and political factors. The price of gold and silver may fluctuate substantially over short periods of time so the Fund’s Share price may be more volatile than other types of investments. Fluctuation in the prices of gold and silver may be due to a number of factors, including changes in inflation, changes in currency exchange rates and changes in industrial and commercial demand for metals (including fabricator demand). Additionally, increased environmental or labor costs may depress the value of metal investments.
International Investors Gold Fund | Market Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Market Risk. The prices of securities are subject to the risks associated with investing in the securities market, including general economic conditions, sudden and unpredictable drops in value, exchange trading suspensions and closures and public health risks. These risks may be magnified if certain social, political, economic and other conditions and events (such as natural disasters, epidemics and pandemics, terrorism, conflicts and social unrest) adversely interrupt the global economy; in these and other circumstances, such events or developments might affect companies world-wide. Overall securities values could decline generally or underperform other investments. An investment may lose money.
International Investors Gold Fund | Operational Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Operational Risk. The Fund is exposed to operational risk arising from a number of factors, including human error, processing and communication errors, errors of the Fund’s service providers, counterparties or other third-parties, failed or inadequate processes and technology or system failures.
International Investors Gold Fund | Regulatory Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Regulatory Risk. Changes in the laws or regulations of the United States, including any changes to applicable tax laws and regulations, could impair the ability of the Fund to achieve its investment objective and could increase the operating expenses of the Fund. The Adviser is registered as a commodity pool operator under the U.S. Commodity Exchange Act and the rules of the U.S. Commodity Futures Trading Commission (“CFTC”) and is subject to CFTC regulation with respect to the Fund. The CFTC has adopted rules regarding the disclosure, reporting and recordkeeping requirements that will apply with respect to the Fund as a result of the Adviser’s registration as a commodity pool operator. Generally, these rules allow for substituted compliance with CFTC disclosure and shareholder reporting requirements, based on the Adviser’s compliance with comparable Securities and Exchange Commission requirements. This means that for most of the CFTC’s disclosure and shareholder reporting applicable to the Adviser as the Fund’s commodity pool operator, the Adviser’s compliance with Securities and Exchange Commission disclosure and shareholder reporting will be deemed to fulfill the Adviser’s CFTC compliance obligations. However, as a result of CFTC regulation with respect to the Fund, the Fund may incur additional compliance and other expenses. The Adviser is also registered as a “commodity trading advisor” (“CTA”) but relies on an exemption with respect to the Fund from CTA regulations available for a CTA that also serves as the Fund’s commodity pool operator. The CFTC has neither reviewed nor approved the Fund, their investment strategies, or this Prospectus.
International Investors Gold Fund | Risk Of Investing In Other Funds Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Risk of Investing in Other Funds. The Fund may invest in shares of other funds, including ETFs. As a result, the Fund will indirectly be exposed to the risks of an investment in the underlying funds. As a shareholder in a fund, the Fund would bear its ratable share of that entity’s expenses. At the same time, the Fund would continue to pay its own investment management fees and other expenses. As a result, the Fund and its shareholders will be absorbing additional levels of fees with respect to investments in other funds, including ETFs.
International Investors Gold Fund | Special Risk Considerations Of Investing In Australian Issuers Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Special Risk Considerations of Investing in Australian Issuers. Investments in securities of Australian issuers involve risks and special considerations not typically associated with investments in the U.S. securities markets. The Australian economy is heavily dependent on exports from the agricultural and mining sectors. As a result, the Australian economy is susceptible to fluctuations in the commodity markets. The Australian economy is also dependent on trading with key trading partners.
International Investors Gold Fund | Special Risk Considerations Of Investing In Canadian Issuers Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Special Risk Considerations of Investing in Canadian Issuers. Investments in securities of Canadian issuers, including issuers located outside of Canada that generate significant revenue from Canada, involve risks and special considerations not typically associated with investments in the U.S. securities markets. The Canadian economy is very dependent on the demand for, and supply and price of, natural resources. The Canadian market is relatively concentrated in issuers involved in the production and distribution of natural resources. There is a risk that any changes in natural resources sectors could have an adverse impact on the Canadian economy. Additionally, the Canadian economy is heavily dependent on relationships with certain key trading partners, including the United States, countries in the European Union and China. Because the United States is Canada’s largest trading partner and foreign investor, the Canadian economy is dependent on and may be significantly affected by the U.S. economy. Reduction in spending on Canadian products and services or changes in the U.S. economy may adversely impact the Canadian economy. Trade agreements may further increase Canada’s dependency on the U.S. economy, and uncertainty as to the future of such trade agreements may cause a decline in the value of the Fund’s Shares. Past periodic demands by the Province of Quebec for sovereignty have significantly affected equity valuations and foreign currency movements in the Canadian market and such demands may have this effect in the future. In addition, certain sectors of Canada’s economy may be subject to foreign ownership limitations. This may negatively impact the Fund’s ability to invest in Canadian issuers and to pursue its investment objective.
International Investors Gold Fund | Small- And Medium-Capitalization Companies Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Small- and Medium-Capitalization Companies Risk. The Fund may invest in small- and medium-capitalization companies and, therefore will be subject to certain risks associated with small- and medium- capitalization companies. These companies are often subject to less analyst coverage and may be in early and less predictable periods of their corporate existences, with little or no record of profitability. In addition, these companies often have greater price volatility, lower trading volume and less liquidity than larger more established companies. These companies tend to have smaller revenues, narrower product lines, less management depth and experience, smaller shares of their product or service markets, fewer financial resources and less competitive strength than large-capitalization companies. Returns on investments in securities of small- and medium-capitalization companies could trail the returns on investments in securities of larger companies.
International Investors Gold Fund | Subsidiary Investment Risk Member  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk [Text Block] rr_RiskTextBlock
Subsidiary Investment Risk. Changes in the laws of the United States and/or the Cayman Islands, under which the Fund and the Subsidiary are organized, respectively, could result in the inability of the Fund to operate as intended and could negatively affect the Fund and its shareholders. The Subsidiary is not registered under the Investment Company Act of 1940 and is not subject to the investor protections of the Investment Company Act of 1940. Thus, the Fund, as an investor in the Subsidiary, will not have all the protections offered to investors in registered investment companies.
Tax Risk (with respect to investments in the Subsidiary). The Fund must derive at least 90% of its gross income from certain qualifying sources of income in order to qualify as a regulated investment company under the Internal Revenue Code of 1986. The Internal Revenue Service issued a revenue ruling in December 2005, which concluded that income and gains from certain commodity-linked derivatives are not qualifying income under Subchapter M of the Internal Revenue Code of 1986. As a result, the Fund’s ability to invest directly in commodity-linked futures contracts or swaps or in certain exchange-traded trusts that hold commodities as part of its investment strategy is limited by the requirement that it receive no more than ten percent (10%) of its gross income from such investments. The Fund expects to invest its assets in the Subsidiary, consistent with applicable law and the advice of counsel, in a manner that should permit the Fund to treat income allocable from the Subsidiary as qualifying income. The Internal Revenue Service has issued regulations that treat a fund’s income inclusion with respect to an investment in a non-U.S. company generating investment income as qualifying income only if there is a current-year distribution out of the earnings and profits of the non-U.S. company that are attributable to such income inclusion or if the income from the Subsidiary is related to the Fund's business of investing. The Fund intends to treat its income from the Subsidiary as qualifying income. There can be no assurance that the Internal Revenue Service will not change its position with respect to some or all of these issues or if the Internal Revenue Service did so, that a court would not sustain the Internal Revenue Service’s position. Furthermore, the tax treatment of the Fund’s investments in the Subsidiary may be adversely affected by future legislation, court decisions, future Internal Revenue Service guidance or Treasury regulations.
International Investors Gold Fund | Class A  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol INIVX
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice 5.75%
Maximum Deferred Sales Charge (as a percentage of Offering Price) rr_MaximumDeferredSalesChargeOverOfferingPrice none [7]
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.72%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.46%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.43%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets none [8]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 1.43%
Expenses Deferred Charges [Text Block] rr_ExpensesDeferredChargesTextBlock A contingent deferred sales charge for Class A shares of 1.00% for one year applies to redemptions of qualified commissionable shares purchased at or above the $1 million breakpoint level.
Expense Breakpoint Discounts [Text] rr_ExpenseBreakpointDiscounts You may qualify for Class A sales charge discounts if you and your family (includes spouse and children under age 21) invest, or agree to invest in the future, at least $25,000, in the aggregate, in Classes A and C of the VanEck Funds.
Expense Breakpoint, Minimum Investment Required [Amount] rr_ExpenseBreakpointMinimumInvestmentRequiredAmount $ 25,000
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 712
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 1,001
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 1,312
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 2,190
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 712
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 1,001
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 1,312
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 2,190
Annual Return 2014 rr_AnnualReturn2014 (6.10%)
Annual Return 2015 rr_AnnualReturn2015 (24.63%)
Annual Return 2016 rr_AnnualReturn2016 53.12%
Annual Return 2017 rr_AnnualReturn2017 13.03%
Annual Return 2018 rr_AnnualReturn2018 (15.99%)
Annual Return 2019 rr_AnnualReturn2019 38.03%
Annual Return 2020 rr_AnnualReturn2020 41.39%
Annual Return 2021 rr_AnnualReturn2021 (14.30%)
Annual Return 2022 rr_AnnualReturn2022 (13.77%)
Annual Return 2023 rr_AnnualReturn2023 9.68%
Label rr_AverageAnnualReturnLabel Before Taxes
1 Year rr_AverageAnnualReturnYear01 3.37%
5 Years rr_AverageAnnualReturnYear05 8.31%
10 Years rr_AverageAnnualReturnYear10 4.37%
International Investors Gold Fund | Class A | After Taxes on Distributions  
Prospectus [Line Items] rr_ProspectusLineItems  
Label rr_AverageAnnualReturnLabel After Taxes on Distributions1 [9]
1 Year rr_AverageAnnualReturnYear01 3.45% [9]
5 Years rr_AverageAnnualReturnYear05 6.57% [9]
10 Years rr_AverageAnnualReturnYear10 2.96% [9]
International Investors Gold Fund | Class A | After Taxes on Distributions and Sales  
Prospectus [Line Items] rr_ProspectusLineItems  
Label rr_AverageAnnualReturnLabel After Taxes on Distributions and Sale of Fund Shares
1 Year rr_AverageAnnualReturnYear01 2.12%
5 Years rr_AverageAnnualReturnYear05 5.92%
10 Years rr_AverageAnnualReturnYear10 2.84%
International Investors Gold Fund | Class C  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol IIGCX
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage of Offering Price) rr_MaximumDeferredSalesChargeOverOfferingPrice 1.00%
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.72%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 1.00%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.53%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 2.25%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.05%) [8]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 2.20%
Expense Breakpoint Discounts [Text] rr_ExpenseBreakpointDiscounts You may qualify for Class A sales charge discounts if you and your family (includes spouse and children under age 21) invest, or agree to invest in the future, at least $25,000, in the aggregate, in Classes A and C of the VanEck Funds.
Expense Breakpoint, Minimum Investment Required [Amount] rr_ExpenseBreakpointMinimumInvestmentRequiredAmount $ 25,000
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 323
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 698
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 1,200
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 2,581
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 223
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 698
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 1,200
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 2,581
Label rr_AverageAnnualReturnLabel Before Taxes
1 Year rr_AverageAnnualReturnYear01 7.90%
5 Years rr_AverageAnnualReturnYear05 8.80%
10 Years rr_AverageAnnualReturnYear10 4.20%
Inception Date rr_AverageAnnualReturnInceptionDate Oct. 03, 2003
International Investors Gold Fund | Class I  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol INIIX
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage of Offering Price) rr_MaximumDeferredSalesChargeOverOfferingPrice none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.72%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.40%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.12%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.12%) [8]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 1.00%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 102
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 344
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 605
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 1,352
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 102
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 344
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 605
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 1,352
Label rr_AverageAnnualReturnLabel Before Taxes
1 Year rr_AverageAnnualReturnYear01 10.26%
5 Years rr_AverageAnnualReturnYear05 10.05%
10 Years rr_AverageAnnualReturnYear10 5.44%
Inception Date rr_AverageAnnualReturnInceptionDate Oct. 02, 2006
International Investors Gold Fund | Class Y  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol INIYX
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage of Offering Price) rr_MaximumDeferredSalesChargeOverOfferingPrice none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.72%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.41%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.13%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.03%) [8]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 1.10%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 112
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 356
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 619
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 1,372
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 112
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 356
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 619
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 1,372
Label rr_AverageAnnualReturnLabel Before Taxes
1 Year rr_AverageAnnualReturnYear01 10.13%
5 Years rr_AverageAnnualReturnYear05 9.95%
10 Years rr_AverageAnnualReturnYear10 5.32%
Inception Date rr_AverageAnnualReturnInceptionDate Apr. 30, 2010
[1] A contingent deferred sales charge for Class A shares of 1.00% for one year applies to redemptions of qualified commissionable shares purchased at or above the $1 million breakpoint level.
[2] Van Eck Associates Corporation (the “Adviser”) has agreed to waive fees and/or pay Fund expenses to the extent necessary to prevent the operating expenses of the Fund (excluding acquired fund fees and expenses, interest expense, trading expenses, dividends and interest payments on securities sold short, taxes and extraordinary expenses) from exceeding 1.60% for Class A, 2.50% for Class C, 1.00% for Class I, 1.10% for Class Y, and 0.90% for Class Z of the Fund’s average daily net assets per year until May 1, 2025. During such time, the expense limitation is expected to continue until the Board of Trustees acts to discontinue all or a portion of such expense limitation.
[3] After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. These returns are shown for one class of shares only; after-tax returns for the other classes may vary. Actual after-tax returns depend on your individual tax situation and may differ from those shown in the preceding table. The after-tax return information shown above does not apply to Fund shares held through a tax-advantaged account, such as a 401(k) plan or Investment Retirement Account.
[4] A contingent deferred sales charge for Class A shares of 1.00% for one year applies to redemptions of qualified commissionable shares purchased at or above the $1 million breakpoint level.
[5] Van Eck Associates Corporation (the “Adviser”) has agreed to waive fees and/or pay Fund expenses to the extent necessary to prevent the operating expenses of the Fund (excluding acquired fund fees and expenses, interest expense, trading expenses, dividends and interest payments on securities sold short, taxes and extraordinary expenses) from exceeding 1.38% for Class A, 2.20% for Class C, 0.95% for Class I, and 1.13% for Class Y of the Fund’s average daily net assets per year until May 1, 2025. During such time, the expense limitation is expected to continue until the Board of Trustees acts to discontinue all or a portion of such expense limitation.
[6] After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. These returns are shown for one class of shares only; after-tax returns for the other classes may vary. Actual after-tax returns depend on your individual tax situation and may differ from those shown in the preceding table. The after-tax return information shown above does not apply to Fund shares held through a tax-advantaged account, such as a 401(k) plan or Investment Retirement Account.
[7] A contingent deferred sales charge for Class A shares of 1.00% for one year applies to redemptions of qualified commissionable shares purchased at or above the $1 million breakpoint level.
[8] Van Eck Associates Corporation (the “Adviser”) has agreed to waive fees and/or pay Fund expenses to the extent necessary to prevent the operating expenses of the Fund (excluding acquired fund fees and expenses, interest expense, trading expenses, dividends and interest payments on securities sold short, taxes and extraordinary expenses) from exceeding 1.45% for Class A, 2.20% for Class C, 1.00% for Class I, and 1.10% for Class Y of the Fund’s average daily net assets per year until May 1, 2025. During such time, the expense limitation is expected to continue until the Board of Trustees acts to discontinue all or a portion of such expense limitation.
[9] After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. These returns are shown for one class of shares only; after-tax returns for the other classes may vary. Actual after-tax returns depend on your individual tax situation and may differ from those shown in the preceding table. The after-tax return information shown above does not apply to Fund shares held through a tax-advantaged account, such as a 401(k) plan or Investment Retirement Account.