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Label Element Value
Risk/Return: rr_RiskReturnAbstract  
Central Index Key dei_EntityCentralIndexKey 0000034273
Virtus KAR Small-Mid Cap Core Fund  
Risk/Return: rr_RiskReturnAbstract  
Risk/Return [Heading] rr_RiskReturnHeading Virtus KAR Small-Mid Cap Core Fund
Objective [Heading] rr_ObjectiveHeading Investment Objective
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock
The fund has an investment objective of long-term capital appreciation,
Objective, Secondary [Text Block] rr_ObjectiveSecondaryTextBlock
with dividend income a secondary consideration.
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 81 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 94 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 January 31, 2020
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 period, the fund's portfolio turnover rate was 16% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 16.00%
Expenses Deferred Charges [Text Block] rr_ExpensesDeferredChargesTextBlock
The deferred sales charge is imposed on Class C Shares redeemed during the first year only.
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 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 Principal Investment Strategies
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock
The fund pursues long-term capital appreciation in the small and medium market capitalization sectors while seeking to incur less risk than the small- and mid-cap markets. The fund invests in a select group of small and mid-market capitalization companies believed by the 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 80% of its assets in common stocks of small and medium market capitalization companies. As of the date of this Prospectus, the fund’s subadviser considers small and medium market capitalization companies for this purpose to be those companies that, at the time of initial purchase, have market capitalizations within the range of companies included in the Russell 2500® Index on a rolling three-year basis. On this basis, as of September 30, 2018, the total market capitalization range of companies included in the Russell 2500® Index over the past three years was $1.7 million to $32.5 billion. Generally, the fund invests in approximately 25 to 35 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:

 

>    Depositary Receipts Risk.  The risk that investments in foreign companies through depositary receipts will expose the fund to the same risks as direct investments in securities of foreign issuers.

 

>    Equity Securities Risk.  The risk that events negatively affecting issuers, industries or financial markets in which the fund invests will impact the value of the stocks held by the fund and, thus, the value of the fund’s shares over short or extended periods. Investments in a particular style or in small or medium-sized companies may enhance that risk.

 

>    Foreign Investing Risk.  The risk that the prices of foreign securities in the fund’s portfolio will be more volatile than those of domestic securities, or will be negatively affected by currency fluctuations, less regulated or liquid securities markets, or economic, political or other developments.

 

>    Limited Number of Investments Risk.  The risk that the fund’s portfolio will be more susceptible to factors adversely affecting issuers of securities in the fund’s portfolio than would a fund holding a greater number of securities.

 

>    Market Volatility Risk.  The risk that the value of the securities in which the fund invests may go up or down in response to the prospects of individual issuers and/or general economic conditions. Such price changes may be temporary or may last for extended periods.

 

>    Redemption Risk.  The risk that redemption by one or more large shareholders or groups of shareholders of their holdings in the fund has an adverse impact on the remaining shareholders in the fund by causing the fund to take actions it would not otherwise take at a given time.

 

>    Small and Medium Market Capitalization Risk.  The risk that the fund's investments in small and medium market capitalization companies will 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 fund has not had a full calendar year of operations; therefore, performance information is not shown here. Updated performance information is available at virtus.com or by calling 800-243-1574.
Performance Availability Phone [Text] rr_PerformanceAvailabilityPhone 800-243-1574
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress virtus.com
Virtus KAR Small-Mid Cap Core 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 0.75%
Distribution and Shareholder Servicing (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Other Expenses rr_OtherExpensesOverAssets 4.84%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 5.84%
Less: Expense Reimbursement rr_FeeWaiverOrReimbursementOverAssets (4.54%) [1]
Total Annual Fund Operating Expenses After Expense Reimbursement rr_NetExpensesOverAssets 1.30% [1]
Share Status rr_ExpenseExampleByYearColumnName Sold
1 Year rr_ExpenseExampleYear01 $ 700
3 Years rr_ExpenseExampleYear03 1,832
5 Years rr_ExpenseExampleYear05 2,945
10 Years rr_ExpenseExampleYear10 $ 5,647
Share Status rr_ExpenseExampleNoRedemptionByYearColumnName Held
1 Year rr_ExpenseExampleNoRedemptionYear01 $ 700
3 Years rr_ExpenseExampleNoRedemptionYear03 1,832
5 Years rr_ExpenseExampleNoRedemptionYear05 2,945
10 Years rr_ExpenseExampleNoRedemptionYear10 $ 5,647
Virtus KAR Small-Mid Cap Core 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 0.75%
Distribution and Shareholder Servicing (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 1.00%
Other Expenses rr_OtherExpensesOverAssets 4.73%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 6.48%
Less: Expense Reimbursement rr_FeeWaiverOrReimbursementOverAssets (4.43%) [1]
Total Annual Fund Operating Expenses After Expense Reimbursement rr_NetExpensesOverAssets 2.05% [1]
Share Status rr_ExpenseExampleByYearColumnName Sold
1 Year rr_ExpenseExampleYear01 $ 308
3 Years rr_ExpenseExampleYear03 1,523
5 Years rr_ExpenseExampleYear05 2,799
10 Years rr_ExpenseExampleYear10 $ 5,827
Share Status rr_ExpenseExampleNoRedemptionByYearColumnName Held
1 Year rr_ExpenseExampleNoRedemptionYear01 $ 208
3 Years rr_ExpenseExampleNoRedemptionYear03 1,523
5 Years rr_ExpenseExampleNoRedemptionYear05 2,799
10 Years rr_ExpenseExampleNoRedemptionYear10 $ 5,827
Virtus KAR Small-Mid Cap Core 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 0.75%
Distribution and Shareholder Servicing (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses rr_OtherExpensesOverAssets 4.99%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 5.74%
Less: Expense Reimbursement rr_FeeWaiverOrReimbursementOverAssets (4.69%) [1]
Total Annual Fund Operating Expenses After Expense Reimbursement rr_NetExpensesOverAssets 1.05% [1]
Share Status rr_ExpenseExampleByYearColumnName Sold
1 Year rr_ExpenseExampleYear01 $ 107
3 Years rr_ExpenseExampleYear03 1,292
5 Years rr_ExpenseExampleYear05 2,459
10 Years rr_ExpenseExampleYear10 $ 5,302
Share Status rr_ExpenseExampleNoRedemptionByYearColumnName Held
1 Year rr_ExpenseExampleNoRedemptionYear01 $ 107
3 Years rr_ExpenseExampleNoRedemptionYear03 1,292
5 Years rr_ExpenseExampleNoRedemptionYear05 2,459
10 Years rr_ExpenseExampleNoRedemptionYear10 $ 5,302
Virtus KAR Small-Mid Cap Core 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 0.75%
Distribution and Shareholder Servicing (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses rr_OtherExpensesOverAssets 4.45%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 5.20%
Less: Expense Reimbursement rr_FeeWaiverOrReimbursementOverAssets (4.23%) [1]
Total Annual Fund Operating Expenses After Expense Reimbursement rr_NetExpensesOverAssets 0.97% [1]
Share Status rr_ExpenseExampleByYearColumnName Sold
1 Year rr_ExpenseExampleYear01 $ 99
3 Years rr_ExpenseExampleYear03 1,179
5 Years rr_ExpenseExampleYear05 2,254
10 Years rr_ExpenseExampleYear10 $ 4,924
Share Status rr_ExpenseExampleNoRedemptionByYearColumnName Held
1 Year rr_ExpenseExampleNoRedemptionYear01 $ 99
3 Years rr_ExpenseExampleNoRedemptionYear03 1,179
5 Years rr_ExpenseExampleNoRedemptionYear05 2,254
10 Years rr_ExpenseExampleNoRedemptionYear10 $ 4,924
[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 expenses, 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 1.30% for Class A Shares, 2.05% for Class C Shares, 1.05% for Class I Shares and 0.97% for Class R6 Shares through January 31, 2020. 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.