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Virtus KAR Emerging Markets Small-Cap Fund  
Risk/Return: rr_RiskReturnAbstract  
Risk/Return [Heading] rr_RiskReturnHeading Virtus KAR Emerging Markets Small-Cap Fund
Objective [Heading] rr_ObjectiveHeading Investment Objective
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock

The fund has an investment objective of capital appreciation.
Expense [Heading] rr_ExpenseHeading Fees and Expenses
Expense Narrative [Text Block] rr_ExpenseNarrativeTextBlock

The tables below illustrate the fees and expenses that you may pay if you buy, hold and sell shares of the fund. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the tables and examples below. You may qualify for sales charge discounts in Class A Shares if you and your family invest, or agree to invest in the future, at least $50,000 in Virtus Funds. More information on these and other discounts is available: (i) from your financial professional or other financial intermediary; (ii) under “Sales Charges” on page 122 of the fund’s prospectus; (iii) with respect to purchase of shares through specific intermediaries, in Appendix A to the fund’s prospectus, entitled “Intermediary Sales Charge Discounts and Waivers;” and (iv) under “Alternative Purchase Arrangements” on page 112 of the fund’s SAI.
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)
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 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 17% of the average value of its portfolio.

Portfolio Turnover, Rate rr_PortfolioTurnoverRate 17.00%
Expense Breakpoint Discounts [Text] rr_ExpenseBreakpointDiscounts You may qualify for sales charge discounts in Class A Shares if you and your family invest, or agree to invest in the future, at least $50,000 in Virtus Funds.
Expense Breakpoint, Minimum Investment Required [Amount] rr_ExpenseBreakpointMinimumInvestmentRequiredAmount $ 50,000
Expense Example [Heading] rr_ExpenseExampleHeading Example
Expense Example Narrative [Text Block] rr_ExpenseExampleNarrativeTextBlock

This example is intended to help you compare the cost of investing in the fund with the cost of investing in other mutual funds. The example assumes that you invest $10,000 in the fund for the time periods indicated and then redeem all of your shares at the end of those periods or continued to hold them. The example also assumes that your investment has a 5% return each year, that the fund’s operating expenses remain the same and that the expense reimbursement agreement remains in place for the contractual period. Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Expense Example by, Year, Caption [Text] rr_ExpenseExampleByYearCaption Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Strategy [Heading] rr_StrategyHeading Principal Investment Strategies
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock

The fund pursues capital appreciation in emerging markets small-cap equities. The fund invests in a select group of small-cap companies believed by the subadviser to be undervalued relative to their future market growth potential. The investment strategy emphasizes companies that the subadviser believes to have a sustainable competitive advantage, strong management and low financial risk and to be able to grow over market cycles.

Under normal circumstances, the fund invests at least 80% of its assets in equity or equity-linked securities of small capitalization companies located in emerging markets countries. The fund’s subadviser considers small-capitalization companies to be those companies that, at the time of initial purchase, have market capitalizations of less than $8 billion. Emerging markets countries generally include every nation in the world except the U.S., Canada, Japan, Australia, New Zealand and most nations located in Western Europe. The fund intends to diversify its investments among countries and normally to have represented in the portfolio business activities of a number of different countries. In determining “location” of an issuer, the subadviser primarily relies on the country where the issuer is incorporated. However, the country of risk is ultimately determined based on analysis of the following criteria: actual building address (domicile), primary exchange on which the security is traded and country in which the greatest percentage of company revenue or profit is generated. This evaluation is conducted so as to determine that the issuer’s assets are exposed to the economic fortunes and risks of the designated country. Equity securities in which the fund invests include common stocks, preferred stocks and American Depositary Receipts (ADRs). The subadviser does not use allocation models to restrict the fund’s investments to certain regions, countries or industries. Generally, the fund invests in approximately 30-60 securities at any given time.
Strategy Portfolio Concentration [Text] rr_StrategyPortfolioConcentration Under normal circumstances, the fund invests at least 80% of its assets in equity or equity-linked securities of small capitalization companies located in emerging markets countries.
Risk [Heading] rr_RiskHeading Principal Risks
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading Performance Information
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock

The bar chart and table below provide some indication of the potential risks of investing in the fund. The fund’s past performance, before and after taxes, is not necessarily an indication of how the fund will perform in the future.

The bar chart shows changes in the fund’s performance from year to year over a 10-year period. The table shows how the fund’s average annual returns compare to those of a broad-based securities market index and a style-specific index that reflects the market sectors in which the fund invests. Updated performance information is available at virtus.com or by calling 800-243-1574.
Performance Information Illustrates Variability of Returns [Text] rr_PerformanceInformationIllustratesVariabilityOfReturns The bar chart and table below provide some indication of the potential risks of investing in the fund.
Performance Additional Market Index [Text] rr_PerformanceAdditionalMarketIndex The MSCI Emerging Markets Index (net) is a free float-adjusted market capitalization-weighted index designed to measure equity market performance in the global emerging markets. The index is calculated on a total return basis with net dividends reinvested. The index is unmanaged and not available for direct investment.
Performance Availability Phone [Text] rr_PerformanceAvailabilityPhone 800-243-1574
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress virtus.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 Calendar year total returns for Class I Shares 
Bar Chart Does Not Reflect Sales Loads [Text] rr_BarChartDoesNotReflectSalesLoads Returns do not reflect sales charges applicable to other share classes and would be lower if they did.
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock
      

Best Quarter:

2020, Q2:

34.75%

Worst Quarter:

2020, Q1:

-20.54%
Performance Table Heading rr_PerformanceTableHeading Average Annual Total Returns
Performance Table Does Reflect Sales Loads rr_PerformanceTableDoesReflectSalesLoads Returns reflect deduction of maximum sales charges and full redemption at end of periods shown.
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. After-tax returns are shown only for Class I Shares; after-tax returns for other classes will vary. Actual after-tax returns depend on the investor’s tax situation and may differ from those shown. After-tax returns are not relevant to investors who hold fund shares in tax-deferred accounts or to shares held by non-taxable entities.
Performance Table Not Relevant to Tax Deferred rr_PerformanceTableNotRelevantToTaxDeferred Actual after-tax returns depend on the investor’s tax situation and may differ from those shown. After-tax returns are not relevant to investors who hold fund shares in tax-deferred accounts or to shares held by non-taxable entities.
Performance Table One Class of after Tax Shown [Text] rr_PerformanceTableOneClassOfAfterTaxShown After-tax returns are shown only for Class I Shares; after-tax returns for other classes will vary.
Performance Table Narrative rr_PerformanceTableNarrativeTextBlock

Returns reflect deduction of maximum sales charges and full redemption at end of periods shown.
Performance Table Closing [Text Block] rr_PerformanceTableClosingTextBlock

The MSCI Emerging Markets Index (net) is a free float-adjusted market capitalization-weighted index designed to measure equity market performance in the global emerging markets. The index is calculated on a total return basis with net dividends reinvested. The index is unmanaged and not available for direct investment.

The MSCI Emerging Markets Small Cap Index (net) is a free float-adjusted market capitalization-weighted index designed to measure small cap equity market performance in the global emerging markets. The index is calculated on a total return basis with net dividends reinvested. The index is unmanaged and not available for direct investment.

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. After-tax returns are shown only for Class I Shares; after-tax returns for other classes will vary. Actual after-tax returns depend on the investor’s tax situation and may differ from those shown. After-tax returns are not relevant to investors who hold fund shares in tax-deferred accounts or to shares held by non-taxable entities.

Virtus KAR Emerging Markets Small-Cap Fund | Risk Lose Money [Member]  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock If between the time you purchase shares and the time you sell shares the value of the fund’s investments decreases, you will lose money.
Virtus KAR Emerging Markets Small-Cap Fund | Equity Securities Risk  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock

> Equity Securities Risk: The value of the stocks held by the fund may be negatively affected by the financial market, industries in which the fund invests, or issuer-specific events. Focus on a particular style or in small or medium-sized companies may enhance that risk.
Virtus KAR Emerging Markets Small-Cap Fund | Foreign Investing Risk  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock

> Foreign Investing Risk: Investing in foreign securities subjects the fund to additional risks such as increased volatility; currency fluctuations; less liquidity; less publicly available information about the foreign investment; and political, regulatory, economic, and market risk.
Virtus KAR Emerging Markets Small-Cap Fund | Emerging Market Risk  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock

> Emerging Market Risk: Emerging markets securities may be more volatile, or more greatly affected by negative conditions, than those of their counterparts in more established foreign markets.
Virtus KAR Emerging Markets Small-Cap Fund | Sector Focused Investing Risk  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock

> Sector Focused Investing Risk: Events negatively affecting a particular market sector in which the fund focuses its investments may cause the value of the fund’s shares to decrease, perhaps significantly.
Virtus KAR Emerging Markets Small-Cap Fund | Focused Investment Risk (Industrial-Related Risk)  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock

> Focused Investment Risk (Industrial-Related Risk): To the extent the fund focuses its investments in a limited number of issuers, sectors, industries or geographic regions, it may be subject to increased risk and volatility. Industrial companies are affected by supply and demand both for their specific product or service and for industrial sector products in general. Government regulation, world events, exchange rates and economic conditions, technological developments and liabilities for environmental damage and general civil liabilities will likewise affect the performance of these companies.
Virtus KAR Emerging Markets Small-Cap Fund | Market Volatility Risk  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock

> Market Volatility Risk: The value of the securities in the fund may go up or down in response to the prospects of individual companies and/or general economic conditions. Price changes may be short- or long-term. Local, regional or global events such as war or military conflict (e.g., Russia’s invasion of Ukraine), acts of terrorism, the spread of infectious illness or other public health issue, recessions, or other events could have a significant impact on the fund and its investments, including hampering the ability of the fund’s portfolio manager(s) to invest the fund’s assets as intended.
Virtus KAR Emerging Markets Small-Cap Fund | Depositary Receipts Risk  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock

> Depositary Receipts Risk: Investments in foreign companies through depositary receipts may expose the fund to the same risks as direct investments in securities of foreign issuers.
Virtus KAR Emerging Markets Small-Cap Fund | Developing Market Risk  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock

> Developing Market Risk: Developing markets securities may be more volatile, or more greatly affected by negative conditions, than those of their counterparts in more established foreign markets.
Virtus KAR Emerging Markets Small-Cap Fund | Investing in Brazil Risk  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock

> Investing in Brazil Risk: Investment in Brazilian issuers involves risks that are specific to Brazil, including legal, regulatory, political, currency and economic risks. The Brazilian economy has historically been exposed to high rates of inflation and a high level of debt, each of which may reduce and/or prevent economic growth.
Virtus KAR Emerging Markets Small-Cap Fund | Investing in China Risk  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock

> Investing in China Risk: The government of China maintains strict currency controls in order to achieve economic, trade and political objectives and regularly intervenes in the currency market. The Chinese government also plays a major role in the country’s economic policies regarding foreign investments. Foreign investors are subject to the risk of loss from expropriation or nationalization of their investment assets and property, governmental restrictions on foreign investments and the repatriation of capital invested. In addition, the rapid growth rate of the Chinese economy over the past several years may not continue, and the trend toward economic liberalization and disparities in wealth may result in social disorder, including violence and labor unrest. These and other factors could have a negative impact on the fund’s performance and increase the volatility of an investment in the fund. Certain securities issued by companies located or operating in China, such as China A-shares, are also subject to trading restrictions, quota limitations and less market liquidity, which could pose risks to the fund.
Virtus KAR Emerging Markets Small-Cap Fund | Investing in India Risk  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock

> Investing in India Risk: Investments in Indian issuers involve risks that are specific to India,including legal, regulatory, political and economic risks. Political and legal uncertainty, greater government control over the economy, currency fluctuations or blockage, and the risk of nationalization or expropriation of assets may result in higher potential for losses. The securities markets in India are relatively underdeveloped and may subject the fund to higher transaction costs or greater uncertainty than investments in more developed securities markets.
Virtus KAR Emerging Markets Small-Cap Fund | Investing in Indonesia Risk  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock

> Investing in Indonesia Risk: Investments in Indonesian issuers involve risks that are specific to Indonesia, including legal, regulatory, political, economic, currency, security,and natural disaster risks. Political and legal uncertainty, greater government control over the economy, currency fluctuations or blockage, and the risk of disruption to business operations due to national security events and/or natural disasters may result in higher potential for losses. The securities markets in Indonesia are relatively underdeveloped and may subject the fund to higher transaction costs or greater uncertainty than investments in more developed securities markets. In addition, the Indonesian economy is heavily dependent on trading relationships with certain key trading partners, including China, Japan, Singapore and the U.S.
Virtus KAR Emerging Markets Small-Cap Fund | Investing in South Korea Risk  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock

> Investing in South Korea Risk: Investing in South Korean securities has special risks, including political, economic and social instability, and the potential for increasing militarization in North Korea. South Korea’s financial sector has shown certain signs of systemic weakness and illiquidity, which, if exacerbated, could prove to be a material risk for any investments in South Korea. South Korea is dependent on foreign sources for its energy needs. A significant increase in energy prices could have an adverse impact on South Korea’s economy. The South Korean government has historically exercised and continues to exercise substantial influence over many aspects of the private sector.
Virtus KAR Emerging Markets Small-Cap Fund | Investing in Taiwan Risk  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock

> Investing in Taiwan Risk: 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. Rising labor costs and increasing environmental consciousness have led some labor-intensive industries to relocate to countries with cheaper work forces, and continued labor outsourcing may adversely affect the Taiwanese economy.
Virtus KAR Emerging Markets Small-Cap Fund | Currency Rate Risk  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock

> Currency Rate Risk: Fluctuations in the exchange rates between the U.S. dollar and foreign currencies may negatively affect the value of the fund’s shares.
Virtus KAR Emerging Markets Small-Cap Fund | Equity-Linked Instruments Risk  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock

> Equity-Linked Instruments Risk: The performance of equity-linked instruments is subject to similar risks to those of the referenced equity security, in addition to the risk that the equity-linked instruments fail to replicate the performance of the referenced equity security. Equity-linked instruments also expose the fund to counterparty risk, which could result in a loss of all or part of the fund’s investment.
Virtus KAR Emerging Markets Small-Cap Fund | Frontier Market Risk  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock

> Frontier Market Risk: Frontier market countries generally have smaller economies and less developed capital markets or legal, regulatory and political systems than traditional emerging market countries. As a result, the risks of investing in emerging market countries are magnified in frontier market countries.
Virtus KAR Emerging Markets Small-Cap Fund | Geographic Investment Risk  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock

> Geographic Investment Risk: To the extent the fund invests a significant portion of its assets in the securities of companies of a single country or region, it is more likely to be impacted by events or conditions affecting that country or region.
Virtus KAR Emerging Markets Small-Cap Fund | Geopolitical Risk  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock

> Geopolitical Risk: Some countries and regions in which the fund invests have experienced security concerns, war or threats of war and aggression, terrorism, economic uncertainty, natural and environmental disasters and/or systemic market dislocations that have led, and in the future may lead, to increased short-term market volatility and may have adverse long-term effects on the U.S.and world economies and markets generally, each of which may negatively impact the fund’s investments.
Virtus KAR Emerging Markets Small-Cap Fund | Limited Number of Investments Risk  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock

> Limited Number of Investments Risk: Because the fund may have a limited number of securities, it may be more susceptible to factors adversely affecting its securities than a fund with a greater number of securities.
Virtus KAR Emerging Markets Small-Cap Fund | Liquidity Risk  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock

> Liquidity Risk: Certain instruments may be difficult or impossible to sell at a time and price beneficial to the fund.
Virtus KAR Emerging Markets Small-Cap Fund | Preferred Stocks Risk  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock

> Preferred Stocks Risk: Preferred stocks may decline in price, fail to pay dividends when expected, or be illiquid.
Virtus KAR Emerging Markets Small-Cap Fund | Redemption Risk  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock

> Redemption Risk: One or more large shareholders or groups of shareholders may redeem their holdings in the fund, resulting in an adverse impact on remaining shareholders in the fund by causing the fund to take actions it would not otherwise have taken.
Virtus KAR Emerging Markets Small-Cap Fund | Small Market Capitalization Companies Risk  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock

> Small Market Capitalization Companies Risk: The fund’s investments in small market capitalization companies may be less liquid and more vulnerable to adverse business or economic developments, which may increase the volatility and risk of loss to the fund, as compared with investments in larger, more established companies.
Virtus KAR Emerging Markets Small-Cap Fund | MSCI Emerging Markets Index (net)  
Risk/Return: rr_RiskReturnAbstract  
Index No Deduction for Fees, Expenses, Taxes [Text] rr_IndexNoDeductionForFeesExpensesTaxes (net) (reflects no deduction for fees, expenses or taxes)
Label rr_AverageAnnualReturnLabel MSCI Emerging Markets Index (net) (reflects no deduction for fees, expenses or taxes)
1 Year rr_AverageAnnualReturnYear01 9.83%
5 Years rr_AverageAnnualReturnYear05 3.69%
10 Years rr_AverageAnnualReturnYear10 2.66%
Since Inception rr_AverageAnnualReturnSinceInception 2.40%
Inception Date rr_AverageAnnualReturnInceptionDate Aug. 01, 2019
Virtus KAR Emerging Markets Small-Cap Fund | MSCI Emerging Markets Small Cap Index (net)  
Risk/Return: rr_RiskReturnAbstract  
Index No Deduction for Fees, Expenses, Taxes [Text] rr_IndexNoDeductionForFeesExpensesTaxes (net) (reflects no deduction for fees, expenses or taxes)
Label rr_AverageAnnualReturnLabel MSCI Emerging Markets Small Cap Index (net) (reflects no deduction for fees, expenses or taxes)
1 Year rr_AverageAnnualReturnYear01 23.92%
5 Years rr_AverageAnnualReturnYear05 9.92%
10 Years rr_AverageAnnualReturnYear10 5.34%
Since Inception rr_AverageAnnualReturnSinceInception 10.32%
Inception Date rr_AverageAnnualReturnInceptionDate Aug. 01, 2019
Virtus KAR Emerging Markets Small-Cap Fund | Class A Shares  
Risk/Return: rr_RiskReturnAbstract  
Trading Symbol dei_TradingSymbol VAESX
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice 5.50%
Maximum Deferred Sales Charge (as a percentage of Offering Price) rr_MaximumDeferredSalesChargeOverOfferingPrice none
Management Fees rr_ManagementFeesOverAssets 1.20%
Distribution and Shareholder Servicing (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Other Expenses rr_OtherExpensesOverAssets 0.34%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 1.79%
Less: Fee Waiver and/or Expense Reimbursement rr_FeeWaiverOrReimbursementOverAssets none [1]
Total Annual Fund Operating Expenses After Recapture rr_NetExpensesOverAssets 1.79% [1]
1 Year rr_ExpenseExampleYear01 $ 722
3 Years rr_ExpenseExampleYear03 1,082
5 Years rr_ExpenseExampleYear05 1,466
10 Years rr_ExpenseExampleYear10 2,539
1 Year rr_ExpenseExampleNoRedemptionYear01 722
3 Years rr_ExpenseExampleNoRedemptionYear03 1,082
5 Years rr_ExpenseExampleNoRedemptionYear05 1,466
10 Years rr_ExpenseExampleNoRedemptionYear10 $ 2,539
Label rr_AverageAnnualReturnLabel Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 14.79%
5 Years rr_AverageAnnualReturnYear05 7.18%
10 Years rr_AverageAnnualReturnYear10 5.37%
Virtus KAR Emerging Markets Small-Cap Fund | Class C Shares  
Risk/Return: rr_RiskReturnAbstract  
Trading Symbol dei_TradingSymbol VCESX
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% [2]
Management Fees rr_ManagementFeesOverAssets 1.20%
Distribution and Shareholder Servicing (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 1.00%
Other Expenses rr_OtherExpensesOverAssets 0.31%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 2.51%
Less: Fee Waiver and/or Expense Reimbursement rr_FeeWaiverOrReimbursementOverAssets none [1]
Total Annual Fund Operating Expenses After Recapture rr_NetExpensesOverAssets 2.53% [1]
1 Year rr_ExpenseExampleYear01 $ 356
3 Years rr_ExpenseExampleYear03 783
5 Years rr_ExpenseExampleYear05 1,337
10 Years rr_ExpenseExampleYear10 2,847
1 Year rr_ExpenseExampleNoRedemptionYear01 256
3 Years rr_ExpenseExampleNoRedemptionYear03 783
5 Years rr_ExpenseExampleNoRedemptionYear05 1,337
10 Years rr_ExpenseExampleNoRedemptionYear10 $ 2,847
Label rr_AverageAnnualReturnLabel Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 20.64%
5 Years rr_AverageAnnualReturnYear05 7.59%
10 Years rr_AverageAnnualReturnYear10 5.18%
Virtus KAR Emerging Markets Small-Cap Fund | Class I Shares  
Risk/Return: rr_RiskReturnAbstract  
Trading Symbol dei_TradingSymbol VIESX
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 rr_ManagementFeesOverAssets 1.20%
Distribution and Shareholder Servicing (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses rr_OtherExpensesOverAssets 0.32%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 1.52%
Less: Fee Waiver and/or Expense Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.02%) [1]
Total Annual Fund Operating Expenses After Recapture rr_NetExpensesOverAssets 1.50% [1]
1 Year rr_ExpenseExampleYear01 $ 153
3 Years rr_ExpenseExampleYear03 478
5 Years rr_ExpenseExampleYear05 827
10 Years rr_ExpenseExampleYear10 1,811
1 Year rr_ExpenseExampleNoRedemptionYear01 153
3 Years rr_ExpenseExampleNoRedemptionYear03 478
5 Years rr_ExpenseExampleNoRedemptionYear05 827
10 Years rr_ExpenseExampleNoRedemptionYear10 $ 1,811
Annual Return 2014 rr_AnnualReturn2014 0.48%
Annual Return 2015 rr_AnnualReturn2015 (16.51%)
Annual Return 2016 rr_AnnualReturn2016 16.14%
Annual Return 2017 rr_AnnualReturn2017 31.01%
Annual Return 2018 rr_AnnualReturn2018 (5.40%)
Annual Return 2019 rr_AnnualReturn2019 18.28%
Annual Return 2020 rr_AnnualReturn2020 38.88%
Annual Return 2021 rr_AnnualReturn2021 (1.65%)
Annual Return 2022 rr_AnnualReturn2022 (22.92%)
Annual Return 2023 rr_AnnualReturn2023 21.83%
Bar Chart, Year to Date Return rr_BarChartYearToDateReturn none
Label rr_HighestQuarterlyReturnLabel Best Quarter
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Jun. 30, 2020
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 34.75%
Label rr_LowestQuarterlyReturnLabel Worst Quarter
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Mar. 31, 2020
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (20.54%)
Label rr_AverageAnnualReturnLabel Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 21.83%
5 Years rr_AverageAnnualReturnYear05 8.69%
10 Years rr_AverageAnnualReturnYear10 6.24%
Virtus KAR Emerging Markets Small-Cap Fund | Class I Shares | After Taxes on Distributions  
Risk/Return: rr_RiskReturnAbstract  
Label rr_AverageAnnualReturnLabel Return After Taxes on Distributions
1 Year rr_AverageAnnualReturnYear01 21.83%
5 Years rr_AverageAnnualReturnYear05 8.11%
10 Years rr_AverageAnnualReturnYear10 5.92%
Virtus KAR Emerging Markets Small-Cap Fund | Class I Shares | After Taxes on Distributions and Sales  
Risk/Return: rr_RiskReturnAbstract  
Label rr_AverageAnnualReturnLabel Return After Taxes on Distributions and Sale of Fund Shares
1 Year rr_AverageAnnualReturnYear01 12.92%
5 Years rr_AverageAnnualReturnYear05 6.88%
10 Years rr_AverageAnnualReturnYear10 5.14%
Virtus KAR Emerging Markets Small-Cap Fund | Class R6 Shares  
Risk/Return: rr_RiskReturnAbstract  
Trading Symbol dei_TradingSymbol VRESX
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 rr_ManagementFeesOverAssets 1.20%
Distribution and Shareholder Servicing (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses rr_OtherExpensesOverAssets 0.23%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 1.43%
Less: Fee Waiver and/or Expense Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.03%) [1]
Total Annual Fund Operating Expenses After Recapture rr_NetExpensesOverAssets 1.40% [1]
1 Year rr_ExpenseExampleYear01 $ 143
3 Years rr_ExpenseExampleYear03 449
5 Years rr_ExpenseExampleYear05 779
10 Years rr_ExpenseExampleYear10 1,710
1 Year rr_ExpenseExampleNoRedemptionYear01 143
3 Years rr_ExpenseExampleNoRedemptionYear03 449
5 Years rr_ExpenseExampleNoRedemptionYear05 779
10 Years rr_ExpenseExampleNoRedemptionYear10 $ 1,710
Label rr_AverageAnnualReturnLabel Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 21.93%
Since Inception rr_AverageAnnualReturnSinceInception 7.08%
Inception Date rr_AverageAnnualReturnInceptionDate Aug. 01, 2019
[1]

The fund’s investment adviser has contractually agreed to limit the fund’s total operating expenses (excluding certain expenses, such as front-end or contingent deferred sales charges, taxes, leverage and borrowing expenses (such as commitment, amendment and renewal expenses on credit or redemption facilities), interest, brokerage commissions, expenses incurred in connection with any merger or reorganization, unusual or infrequently occurring expenses (such as litigation), acquired fund fees and expenses, and dividend expenses, if any) so that such expenses do not exceed 1.50% for Class I Shares and 1.40% for Class R6 Shares through January 31, 2025. Prior to January 31, 2025, only the fund’s Board may modify or terminate the expense limitation agreement. Following the contractual period, the adviser may discontinue these expense reimbursement arrangements at any time. Under certain conditions, the adviser may recapture operating expenses reimbursed and/or fees waived under these arrangements for a period of three years following the date such waiver or reimbursement occurred, provided that the recapture does not cause the fund to exceed its expense limit in effect at the time of the waiver or reimbursement, and any in effect at the time of recapture, after repayment is taken into account.
[2]

The deferred sales charge is imposed on Class C Shares redeemed during the first year only.