| Label | Element | Value | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Virtus KAR International Small-Mid Cap Fund | |||||||||||||||
| Risk/Return: | rr_RiskReturnAbstract | ||||||||||||||
| Risk/Return [Heading] | rr_RiskReturnHeading | Virtus KAR International Small-Mid Cap Fund | |||||||||||||
| Objective [Heading] | rr_ObjectiveHeading | Investment Objective | |||||||||||||
| Objective, Primary [Text Block] | rr_ObjectivePrimaryTextBlock | The fund has an investment objective of capital appreciation. |
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| 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 108 of the fund’s prospectus; and (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.” |
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| 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 19% of the average value of its portfolio. |
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| Portfolio Turnover, Rate | rr_PortfolioTurnoverRate | 19.00% | |||||||||||||
| 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 and that the fund’s operating expenses remain the same. Although your actual costs may be higher or lower, based on these assumptions your costs would be: |
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| 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 | Under normal circumstances, the fund invests at least 80% of its assets in equity securities of non-U.S. small- and mid-capitalization companies. As of the date of this Prospectus, the fund’s subadviser considers small- and mid-capitalization companies to be those companies that, at the time of initial purchase, have market capitalizations within the range of companies included in the MSCI All Country World ex U.S. SMID Cap Index on a rolling three-year basis. As of September 30, 2024, the total market capitalization range of companies included in the MSCI All Country World ex U.S. SMID Cap Index over the past three years was $0 to $39.5 billion. 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 whether an issuer is economically tied to a non-U.S. country, the subadviser primarily considers: (i) whether at least 50% of the issuer’s revenues or profits are attributable to goods produced or sold, investments made, or services performed in, a non-U.S. country; (ii) whether the issuer has at least 50% of its assets in a non-U.S. country; and (iii) whether the principal exchange listing for the issuer’s securities or the issuer’s headquarters is in a non-U.S. country. Equity securities in which the fund invests include common stocks, preferred stocks and American Depositary Receipts (ADRs). The fund may invest in emerging markets issuers. Generally, the fund invests in approximately 30-60 securities at any given time. |
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| Strategy Portfolio Concentration [Text] | rr_StrategyPortfolioConcentration | Under normal circumstances, the fund invests at least 80% of its assets in equity securities of non-U. | |||||||||||||
| 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. |
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| 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 All Country World ex USA Index (net) is a free float-adjusted market capitalization-weighted index that measures equity performance of developed and emerging markets, excluding the United States. 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 |
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| Performance Table Heading | rr_PerformanceTableHeading | Average Annual Total Returns (for the periods ended 12/31/24) | |||||||||||||
| 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. In certain cases, the Return After Taxes on Distributions and Sale of Fund Shares for a period may be higher than other return figures for the same period. This will occur when a capital loss is realized upon the sale of fund shares and provides an assumed tax benefit that increases the return. | |||||||||||||
| 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 Explanation after Tax Higher | rr_PerformanceTableExplanationAfterTaxHigher | In certain cases, the Return After Taxes on Distributions and Sale of Fund Shares for a period may be higher than other return figures for the same period. This will occur when a capital loss is realized upon the sale of fund shares and provides an assumed tax benefit that increases the return. | |||||||||||||
| Performance Table Closing [Text Block] | rr_PerformanceTableClosingTextBlock | The MSCI All Country World ex USA Index (net) is a free float-adjusted market capitalization-weighted index that measures equity performance of developed and emerging markets, excluding the United States. 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 All Country World ex USA SMID Cap Index (net) is a free float-adjusted market capitalization-weighted index that measures mid- and small-cap performance across 22 of 23 Developed Market countries (excluding the U.S.) and 24 Emerging Markets countries. 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. In certain cases, the Return After Taxes on Distributions and Sale of Fund Shares for a period may be higher than other return figures for the same period. This will occur when a capital loss is realized upon the sale of fund shares and provides an assumed tax benefit that increases the return. |
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| Virtus KAR International Small-Mid 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 International Small-Mid 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. |
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| Virtus KAR International Small-Mid 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. |
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| Virtus KAR International Small-Mid 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. Such securities may also be subject to Sanctions Risk. |
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| Virtus KAR International Small-Mid Cap Fund | Sanctions Risk | |||||||||||||||
| Risk/Return: | rr_RiskReturnAbstract | ||||||||||||||
| Risk [Text Block] | rr_RiskTextBlock | > Sanctions Risk: The imposition of sanctions and other similar measures could cause a decline in the value and/or liquidity of securities issued by or tied to the sanctioned country and increase market volatility and disruption in the sanctioned country and throughout the world. Sanctions and other similar measures could limit or prevent the fund from buying and selling securities (in the sanctioned country and other markets), significantly delay or prevent the settlement of transactions, and negatively impact the fund’s liquidity and performance. |
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| Virtus KAR International Small-Mid 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. |
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| Virtus KAR International Small-Mid 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. |
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| Virtus KAR International Small-Mid 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. |
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| Virtus KAR International Small-Mid 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. |
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| Virtus KAR International Small-Mid Cap Fund | Small and Medium Market Capitalization Companies Risk | |||||||||||||||
| Risk/Return: | rr_RiskReturnAbstract | ||||||||||||||
| Risk [Text Block] | rr_RiskTextBlock | > Small and Medium Market Capitalization Companies Risk: The fund’s investments in small and medium market capitalization companies may increase the volatility and risk of loss to the fund, as compared with investments in larger, more established companies. |
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| Virtus KAR International Small-Mid 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. |
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| Virtus KAR International Small-Mid 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. |
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| Virtus KAR International Small-Mid 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. |
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| Virtus KAR International Small-Mid 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. |
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| Virtus KAR International Small-Mid 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. |
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| Virtus KAR International Small-Mid 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. |
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| Virtus KAR International Small-Mid 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. |
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| Virtus KAR International Small-Mid 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. |
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| Virtus KAR International Small-Mid Cap Fund | MSCI All Country World ex USA Index (net) | |||||||||||||||
| Risk/Return: | rr_RiskReturnAbstract | ||||||||||||||
| Index No Deduction for Fees, Expenses, Taxes [Text] | rr_IndexNoDeductionForFeesExpensesTaxes | (reflects no deduction for fees or expenses) | |||||||||||||
| Label | rr_AverageAnnualReturnLabel | MSCI All Country World ex USA Index (net) | |||||||||||||
| 1 Year | rr_AverageAnnualReturnYear01 | 5.53% | |||||||||||||
| 5 Years | rr_AverageAnnualReturnYear05 | 4.10% | |||||||||||||
| 10 Years | rr_AverageAnnualReturnYear10 | 4.80% | |||||||||||||
| Virtus KAR International Small-Mid Cap Fund | MSCI All Country World ex USA SMID Cap Index (net) | |||||||||||||||
| Risk/Return: | rr_RiskReturnAbstract | ||||||||||||||
| Index No Deduction for Fees, Expenses, Taxes [Text] | rr_IndexNoDeductionForFeesExpensesTaxes | (reflects no deduction for fees or expenses) | |||||||||||||
| Label | rr_AverageAnnualReturnLabel | MSCI All Country World ex USA SMID Cap Index (net) | |||||||||||||
| 1 Year | rr_AverageAnnualReturnYear01 | 3.49% | |||||||||||||
| 5 Years | rr_AverageAnnualReturnYear05 | 3.55% | |||||||||||||
| 10 Years | rr_AverageAnnualReturnYear10 | 5.06% | |||||||||||||
| Virtus KAR International Small-Mid Cap Fund | Class A Shares | |||||||||||||||
| Risk/Return: | rr_RiskReturnAbstract | ||||||||||||||
| Trading Symbol | dei_TradingSymbol | VISAX | |||||||||||||
| 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 | 0.90% | |||||||||||||
| Distribution and Shareholder Servicing (12b-1) Fees | rr_DistributionAndService12b1FeesOverAssets | 0.25% | |||||||||||||
| Other Expenses | rr_OtherExpensesOverAssets | 0.30% | |||||||||||||
| Total Annual Fund Operating Expenses | rr_ExpensesOverAssets | 1.45% | |||||||||||||
| 1 Year | rr_ExpenseExampleYear01 | $ 689 | |||||||||||||
| 3 Years | rr_ExpenseExampleYear03 | 983 | |||||||||||||
| 5 Years | rr_ExpenseExampleYear05 | 1,299 | |||||||||||||
| 10 Years | rr_ExpenseExampleYear10 | 2,190 | |||||||||||||
| 1 Year | rr_ExpenseExampleNoRedemptionYear01 | 689 | |||||||||||||
| 3 Years | rr_ExpenseExampleNoRedemptionYear03 | 983 | |||||||||||||
| 5 Years | rr_ExpenseExampleNoRedemptionYear05 | 1,299 | |||||||||||||
| 10 Years | rr_ExpenseExampleNoRedemptionYear10 | $ 2,190 | |||||||||||||
| Label | rr_AverageAnnualReturnLabel | Return Before Taxes | |||||||||||||
| 1 Year | rr_AverageAnnualReturnYear01 | (1.81%) | |||||||||||||
| 5 Years | rr_AverageAnnualReturnYear05 | 0.49% | |||||||||||||
| 10 Years | rr_AverageAnnualReturnYear10 | 6.37% | |||||||||||||
| Virtus KAR International Small-Mid Cap Fund | Class C Shares | |||||||||||||||
| Risk/Return: | rr_RiskReturnAbstract | ||||||||||||||
| Trading Symbol | dei_TradingSymbol | VCISX | |||||||||||||
| 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% | [1] | ||||||||||||
| Management Fees | rr_ManagementFeesOverAssets | 0.90% | |||||||||||||
| Distribution and Shareholder Servicing (12b-1) Fees | rr_DistributionAndService12b1FeesOverAssets | 1.00% | |||||||||||||
| Other Expenses | rr_OtherExpensesOverAssets | 0.30% | |||||||||||||
| Total Annual Fund Operating Expenses | rr_ExpensesOverAssets | 2.20% | |||||||||||||
| 1 Year | rr_ExpenseExampleYear01 | $ 323 | |||||||||||||
| 3 Years | rr_ExpenseExampleYear03 | 688 | |||||||||||||
| 5 Years | rr_ExpenseExampleYear05 | 1,180 | |||||||||||||
| 10 Years | rr_ExpenseExampleYear10 | 2,534 | |||||||||||||
| 1 Year | rr_ExpenseExampleNoRedemptionYear01 | 223 | |||||||||||||
| 3 Years | rr_ExpenseExampleNoRedemptionYear03 | 688 | |||||||||||||
| 5 Years | rr_ExpenseExampleNoRedemptionYear05 | 1,180 | |||||||||||||
| 10 Years | rr_ExpenseExampleNoRedemptionYear10 | $ 2,534 | |||||||||||||
| Label | rr_AverageAnnualReturnLabel | Return Before Taxes | |||||||||||||
| 1 Year | rr_AverageAnnualReturnYear01 | 3.09% | |||||||||||||
| 5 Years | rr_AverageAnnualReturnYear05 | 0.88% | |||||||||||||
| 10 Years | rr_AverageAnnualReturnYear10 | 6.19% | |||||||||||||
| Virtus KAR International Small-Mid Cap Fund | Class I Shares | |||||||||||||||
| Risk/Return: | rr_RiskReturnAbstract | ||||||||||||||
| Trading Symbol | dei_TradingSymbol | VIISX | |||||||||||||
| 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 | 0.90% | |||||||||||||
| Distribution and Shareholder Servicing (12b-1) Fees | rr_DistributionAndService12b1FeesOverAssets | none | |||||||||||||
| Other Expenses | rr_OtherExpensesOverAssets | 0.28% | |||||||||||||
| Total Annual Fund Operating Expenses | rr_ExpensesOverAssets | 1.18% | |||||||||||||
| 1 Year | rr_ExpenseExampleYear01 | $ 120 | |||||||||||||
| 3 Years | rr_ExpenseExampleYear03 | 375 | |||||||||||||
| 5 Years | rr_ExpenseExampleYear05 | 649 | |||||||||||||
| 10 Years | rr_ExpenseExampleYear10 | 1,432 | |||||||||||||
| 1 Year | rr_ExpenseExampleNoRedemptionYear01 | 120 | |||||||||||||
| 3 Years | rr_ExpenseExampleNoRedemptionYear03 | 375 | |||||||||||||
| 5 Years | rr_ExpenseExampleNoRedemptionYear05 | 649 | |||||||||||||
| 10 Years | rr_ExpenseExampleNoRedemptionYear10 | $ 1,432 | |||||||||||||
| Annual Return 2015 | rr_AnnualReturn2015 | (0.87%) | |||||||||||||
| Annual Return 2016 | rr_AnnualReturn2016 | 21.03% | |||||||||||||
| Annual Return 2017 | rr_AnnualReturn2017 | 28.48% | |||||||||||||
| Annual Return 2018 | rr_AnnualReturn2018 | (6.79%) | |||||||||||||
| Annual Return 2019 | rr_AnnualReturn2019 | 27.58% | |||||||||||||
| Annual Return 2020 | rr_AnnualReturn2020 | 24.37% | |||||||||||||
| Annual Return 2021 | rr_AnnualReturn2021 | 5.73% | |||||||||||||
| Annual Return 2022 | rr_AnnualReturn2022 | (34.42%) | |||||||||||||
| Annual Return 2023 | rr_AnnualReturn2023 | 22.36% | |||||||||||||
| Annual Return 2024 | rr_AnnualReturn2024 | 4.10% | |||||||||||||
| 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 | 23.20% | |||||||||||||
| Label | rr_LowestQuarterlyReturnLabel | Worst Quarter | |||||||||||||
| Lowest Quarterly Return, Date | rr_BarChartLowestQuarterlyReturnDate | Mar. 31, 2020 | |||||||||||||
| Lowest Quarterly Return | rr_BarChartLowestQuarterlyReturn | (25.53%) | |||||||||||||
| Label | rr_AverageAnnualReturnLabel | Return Before Taxes | |||||||||||||
| 1 Year | rr_AverageAnnualReturnYear01 | 4.10% | |||||||||||||
| 5 Years | rr_AverageAnnualReturnYear05 | 1.90% | |||||||||||||
| 10 Years | rr_AverageAnnualReturnYear10 | 7.25% | |||||||||||||
| Virtus KAR International Small-Mid 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 | 3.90% | |||||||||||||
| 5 Years | rr_AverageAnnualReturnYear05 | 1.41% | |||||||||||||
| 10 Years | rr_AverageAnnualReturnYear10 | 6.76% | |||||||||||||
| Virtus KAR International Small-Mid 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 | 3.03% | |||||||||||||
| 5 Years | rr_AverageAnnualReturnYear05 | 1.56% | |||||||||||||
| 10 Years | rr_AverageAnnualReturnYear10 | 5.92% | |||||||||||||
| Virtus KAR International Small-Mid Cap Fund | Class R6 Shares | |||||||||||||||
| Risk/Return: | rr_RiskReturnAbstract | ||||||||||||||
| Trading Symbol | dei_TradingSymbol | VRISX | |||||||||||||
| 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 | 0.90% | |||||||||||||
| Distribution and Shareholder Servicing (12b-1) Fees | rr_DistributionAndService12b1FeesOverAssets | none | |||||||||||||
| Other Expenses | rr_OtherExpensesOverAssets | 0.18% | |||||||||||||
| Total Annual Fund Operating Expenses | rr_ExpensesOverAssets | 1.08% | |||||||||||||
| 1 Year | rr_ExpenseExampleYear01 | $ 110 | |||||||||||||
| 3 Years | rr_ExpenseExampleYear03 | 343 | |||||||||||||
| 5 Years | rr_ExpenseExampleYear05 | 595 | |||||||||||||
| 10 Years | rr_ExpenseExampleYear10 | 1,317 | |||||||||||||
| 1 Year | rr_ExpenseExampleNoRedemptionYear01 | 110 | |||||||||||||
| 3 Years | rr_ExpenseExampleNoRedemptionYear03 | 343 | |||||||||||||
| 5 Years | rr_ExpenseExampleNoRedemptionYear05 | 595 | |||||||||||||
| 10 Years | rr_ExpenseExampleNoRedemptionYear10 | $ 1,317 | |||||||||||||
| Label | rr_AverageAnnualReturnLabel | Return Before Taxes | |||||||||||||
| 1 Year | rr_AverageAnnualReturnYear01 | 4.23% | |||||||||||||
| 5 Years | rr_AverageAnnualReturnYear05 | 2.00% | |||||||||||||
| 10 Years | rr_AverageAnnualReturnYear10 | 7.36% | |||||||||||||
| |||||||||||||||