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Virtus KAR Capital Growth Fund  
Risk/Return: rr_RiskReturnAbstract  
Risk/Return [Heading] rr_RiskReturnHeading Virtus KAR Capital Growth Fund
Objective [Heading] rr_ObjectiveHeading Investment Objective
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock
The fund has an investment objective of long-term capital growth.
Expense [Heading] rr_ExpenseHeading Fees and Expenses
Expense Narrative [Text Block] rr_ExpenseNarrativeTextBlock
The tables below illustrate all fees and expenses that you may pay if you buy and hold shares of the fund. 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 advisor or other financial intermediary; (ii) under “Sales Charges” on page 87 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 99 of the fund’s statement of additional information (“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)
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination Jan. 31, 2021
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 12% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 12.00%
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 an investment of  $10,000 in the fund for the time periods indicated. It shows your costs if you sold your shares at the end of the period 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 arrangement remains in place for the contractual period. Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Strategy [Heading] rr_StrategyHeading Investments, Risks and Performance
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock
Principal Investment Strategies

The fund invests in a select group of large market capitalization growth companies believed by the fund’s subadviser to be undervalued relative to their future growth potential. The investment strategy emphasizes companies the subadviser believes to have a sustainable competitive advantage, strong management and low financial risk, and to be able to grow over market cycles. Although the fund invests primarily in U.S. companies, it may invest in foreign securities and depositary receipts.

Under normal circumstances, the fund invests at least 65% of its assets in equity securities of large market capitalization companies. As of the date of this Prospectus, the fund’s subadviser considers large market capitalization companies for this purpose to be those companies that, at the time of initial purchase, have market capitalizations generally within the range of companies included in the Russell 1000® Growth Index on a rolling three-year basis. On this basis, as of September 30, 2019, the total market capitalization range of companies included in the Russell 1000® Growth Index over the past three years was $50.2 million to $1.10 trillion. The fund may also invest in small and medium capitalization companies. Generally, the fund invests in approximately 25 to 50 securities at any given time.
Risk [Heading] rr_RiskHeading Principal Risks
Risk Narrative [Text Block] rr_RiskNarrativeTextBlock
The fund may not achieve its objective(s), and it is not intended to be a complete investment program. The value of the fund’s investments that supports your share value may decrease. 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. Investment values can decrease for a number of reasons. Conditions affecting the overall economy, specific industries or companies in which the fund invests can be worse than expected, and investments may fail to perform as the subadviser expects. As a result, the value of your shares may decrease. Purchase and redemption activities by fund shareholders may impact the management of the fund and its ability to achieve its investment objective(s). The principal risks of investing in the fund are identified below.

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.

Limited Number of Investments Risk.  Because the fund has 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.

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.

Foreign Investing Risk.  Investing in foreign securities subjects the fund to additional risks such as increased volatility; currency fluctuations; less liquidity; and political, regulatory, economic, and market risk.

Growth Stocks Risk.  The fund’s investments in growth stocks may be more volatile than investments in other types of stocks, or may perform differently from the market as a whole and from other types of stocks.

Large Market Capitalization Companies Risk.  The value of investments in larger companies may not rise as much as smaller companies, or larger companies may be unable to respond quickly to competitive challenges, such as changes in technology and consumer tastes.

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.

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.

Small and Medium Market Capitalization 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.
Risk Lose Money [Text] rr_RiskLoseMoney 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.
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. 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 Russell 1000® Growth Index is a market capitalization-weighted index of growth-oriented stocks of the 1,000 largest companies in the Russell Universe, which comprises the 3,000 largest U.S. companies. The index is calculated on a total-return basis with 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 Narrative [Text Block] rr_BarChartNarrativeTextBlock
Returns do not reflect sales charges and would be lower if they did.

Bar Chart Does Not Reflect Sales Loads [Text] rr_BarChartDoesNotReflectSalesLoads Returns do not reflect sales charges and would be lower if they did.
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock
​ ​
Best Quarter:
 ​ ​
Q1/2019:
 ​ ​
23.50%
 ​ ​
Worst Quarter:
 ​ ​
Q3/2011:
 ​ ​
-20.10%
 ​ ​
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Best Quarter:
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Mar. 31, 2019
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 23.50%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Worst Quarter:
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Sep. 30, 2011
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (20.10%)
Performance Table Heading rr_PerformanceTableHeading Average Annual Total Returns (for the periods ended 12/31/19)
Performance Table Does Reflect Sales Loads rr_PerformanceTableDoesReflectSalesLoads Returns reflect deduction of maximum sales charges and full redemption at end of periods shown.
Index No Deduction for Fees, Expenses, Taxes [Text] rr_IndexNoDeductionForFeesExpensesTaxes (reflects no deduction for fees, expenses or taxes)
Performance Table Uses Highest Federal Rate rr_PerformanceTableUsesHighestFederalRate After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes.
Performance Table Not Relevant to Tax Deferred rr_PerformanceTableNotRelevantToTaxDeferred Actual after-tax returns depend on the investor’s tax situation and may differ from those shown. 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 Russell 1000® Growth Index is a market capitalization-weighted index of growth-oriented stocks of the 1,000 largest companies in the Russell Universe, which comprises the 3,000 largest U.S. companies. The index is calculated on a total-return basis with 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 Capital Growth Fund | Russell 1000® Growth Index (reflects no deduction for fees, expenses or taxes)  
Risk/Return: rr_RiskReturnAbstract  
Label rr_AverageAnnualReturnLabel Russell 1000® Growth Index (reflects no deduction for fees, expenses or taxes)
1 Year rr_AverageAnnualReturnYear01 36.39%
5 Years rr_AverageAnnualReturnYear05 14.63%
10 Years rr_AverageAnnualReturnYear10 15.22%
Since Inception rr_AverageAnnualReturnSinceInception 12.67%
Inception Date rr_AverageAnnualReturnInceptionDate Jan. 30, 2018
Virtus KAR Capital Growth Fund | Class A  
Risk/Return: rr_RiskReturnAbstract  
Maximum Sales Charge (load) Imposed on Purchases (as a percentage of offering price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice 5.75%
Maximum Deferred Sales Charge (load) (as a percentage of the lesser of purchase price or redemption proceeds) rr_MaximumDeferredSalesChargeOverOther none
Management Fees rr_ManagementFeesOverAssets 0.70%
Distribution and Shareholder Servicing (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Other Expenses rr_OtherExpensesOverAssets 0.29%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 1.24%
Less: Fee Waiver and/or Expense Reimbursement rr_FeeWaiverOrReimbursementOverAssets none
Total Annual Operating Expenses After Expense Reimbursement rr_NetExpensesOverAssets 1.24% [1]
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, with Redemption, 1 Year rr_ExpenseExampleYear01 694
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 946
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 1,217
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 1,989
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 694
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 946
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 1,217
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 1,989
Label rr_AverageAnnualReturnLabel Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 34.60%
5 Years rr_AverageAnnualReturnYear05 12.55%
10 Years rr_AverageAnnualReturnYear10 12.57%
Virtus KAR Capital Growth Fund | Class C  
Risk/Return: rr_RiskReturnAbstract  
Maximum Sales Charge (load) Imposed on Purchases (as a percentage of offering price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (load) (as a percentage of the lesser of purchase price or redemption proceeds) rr_MaximumDeferredSalesChargeOverOther 1.00% [2]
Management Fees rr_ManagementFeesOverAssets 0.70%
Distribution and Shareholder Servicing (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 1.00%
Other Expenses rr_OtherExpensesOverAssets 0.32%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 2.02%
Less: Fee Waiver and/or Expense Reimbursement rr_FeeWaiverOrReimbursementOverAssets none
Total Annual Operating Expenses After Expense Reimbursement rr_NetExpensesOverAssets 2.02% [1]
Expenses Deferred Charges [Text Block] rr_ExpensesDeferredChargesTextBlock The deferred sales charge is imposed on Class C Shares redeemed during the first year only.
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 305
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 634
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 1,088
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 2,348
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 205
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 634
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 1,088
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 2,348
Label rr_AverageAnnualReturnLabel Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 41.61%
5 Years rr_AverageAnnualReturnYear05 13.04%
10 Years rr_AverageAnnualReturnYear10 12.38%
Virtus KAR Capital Growth Fund | Class I  
Risk/Return: rr_RiskReturnAbstract  
Maximum Sales Charge (load) Imposed on Purchases (as a percentage of offering price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (load) (as a percentage of the lesser of purchase price or redemption proceeds) rr_MaximumDeferredSalesChargeOverOther none
Management Fees rr_ManagementFeesOverAssets 0.70%
Distribution and Shareholder Servicing (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses rr_OtherExpensesOverAssets 0.33%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 1.03%
Less: Fee Waiver and/or Expense Reimbursement rr_FeeWaiverOrReimbursementOverAssets none
Total Annual Operating Expenses After Expense Reimbursement rr_NetExpensesOverAssets 1.03% [1]
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 105
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 328
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 569
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 1,259
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 105
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 328
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 569
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 1,259
Annual Return 2010 rr_AnnualReturn2010 16.24%
Annual Return 2011 rr_AnnualReturn2011 (4.16%)
Annual Return 2012 rr_AnnualReturn2012 13.70%
Annual Return 2013 rr_AnnualReturn2013 29.42%
Annual Return 2014 rr_AnnualReturn2014 11.58%
Annual Return 2015 rr_AnnualReturn2015 9.33%
Annual Return 2016 rr_AnnualReturn2016 (1.00%)
Annual Return 2017 rr_AnnualReturn2017 35.53%
Annual Return 2018 rr_AnnualReturn2018 (7.57%)
Annual Return 2019 rr_AnnualReturn2019 43.09%
Label rr_AverageAnnualReturnLabel Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 43.09%
5 Years rr_AverageAnnualReturnYear05 14.18%
10 Years rr_AverageAnnualReturnYear10 13.50%
Virtus KAR Capital Growth Fund | Class I | After Taxes on Distributions  
Risk/Return: rr_RiskReturnAbstract  
Label rr_AverageAnnualReturnLabel Return After Taxes on Distributions
1 Year rr_AverageAnnualReturnYear01 42.23%
5 Years rr_AverageAnnualReturnYear05 12.50%
10 Years rr_AverageAnnualReturnYear10 12.44%
Virtus KAR Capital Growth Fund | Class I | After Taxes on Distributions and Sale of Fund Shares  
Risk/Return: rr_RiskReturnAbstract  
Label rr_AverageAnnualReturnLabel Return After Taxes on Distributions and Sale of Fund Shares
1 Year rr_AverageAnnualReturnYear01 26.13%
5 Years rr_AverageAnnualReturnYear05 10.95%
10 Years rr_AverageAnnualReturnYear10 11.03%
Virtus KAR Capital Growth Fund | Class R6  
Risk/Return: rr_RiskReturnAbstract  
Maximum Sales Charge (load) Imposed on Purchases (as a percentage of offering price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (load) (as a percentage of the lesser of purchase price or redemption proceeds) rr_MaximumDeferredSalesChargeOverOther none
Management Fees rr_ManagementFeesOverAssets 0.70%
Distribution and Shareholder Servicing (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses rr_OtherExpensesOverAssets 0.24%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 0.94%
Less: Fee Waiver and/or Expense Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.21%)
Total Annual Operating Expenses After Expense Reimbursement rr_NetExpensesOverAssets 0.73% [1]
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 75
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 279
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 500
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 1,135
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 75
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 279
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 500
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 1,135
Label rr_AverageAnnualReturnLabel Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 43.51%
Since Inception rr_AverageAnnualReturnSinceInception 10.11%
Inception Date rr_AverageAnnualReturnInceptionDate Jan. 30, 2018
[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 0.73% for Class R6 Shares through January 31, 2021. 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, or at the time of recapture.
[2] The deferred sales charge is imposed on Class C Shares redeemed during the first year only.