v3.26.3
Label Element Value
Virtus Small-Cap Fund  
Risk/Return: oef_RiskReturnAbstract  
Risk/Return [Heading] oef_RiskReturnHeading Virtus Small-Cap Fund
Objective [Heading] oef_ObjectiveHeading Investment Objective
Objective, Primary [Text Block] oef_ObjectivePrimaryTextBlock

The fund seeks long-term capital appreciation.
Expense Heading [Optional Text] oef_ExpenseHeading Fees and Expenses
Expense Narrative [Text Block] oef_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 93 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.”
Shareholder Fees Caption [Optional Text] oef_ShareholderFeesCaption Shareholder Fees (fees paid directly from your investment)
Operating Expenses Caption [Optional Text] oef_OperatingExpensesCaption Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)
Portfolio Turnover [Heading] oef_PortfolioTurnoverHeading Portfolio Turnover
Portfolio Turnover [Text Block] oef_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 71% of the average value of its portfolio.

Portfolio Turnover, Rate oef_PortfolioTurnoverRate 71.00%
Expense Breakpoint Discounts [Text] oef_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] oef_ExpenseBreakpointMinimumInvestmentRequiredAmount $ 50,000
Expense Example [Heading] oef_ExpenseExampleHeading Example
Expense Example Narrative [Text Block] oef_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] oef_ExpenseExampleByYearCaption Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Strategy [Heading] oef_StrategyHeading Principal Investment Strategies
Strategy Narrative [Text Block] oef_StrategyNarrativeTextBlock

Under normal circumstances, the fund invests at least 80% of its net assets (plus borrowings made for investment purposes) in companies with smaller market capitalizations. As of the date of this prospectus, the fund considers smaller market capitalization companies to be companies with market capitalizations that are smaller than the largest company in the fund’s benchmark, the Russell 2000 Index (approximately $14.2 billion as of June 30, 2026). The fund expects to invest principally in U.S. companies but may invest to a lesser extent in non-U.S. companies. The fund’s principal investment universe includes micro-cap companies, which the portfolio managers consider to be those with market capitalizations generally in the bottom half of the benchmark. The portfolio managers generally seek exposure to smaller capitalization companies, including micro-cap companies, by employing three distinct small-cap strategies or “sleeves” for selecting individual stocks:

 Quantitative Core. The Quantitative Core sleeve normally invests primarily in common stocks of companies with smaller market capitalizations that are listed on U.S. exchanges. The team’s quantitative investment process begins with a proprietary alpha model which blends behavioral factors (e.g., human behaviors and biases) and intrinsic valuation factors (e.g., tangible measures of a company’s underlying worth). The team utilizes a risk model for portfolio construction, with constraints at the individual security and industry levels to manage exposures relative to the benchmark. Additionally, all investment recommendations are thoroughly vetted at the individual company level to confirm the investment rationale and suitability before a purchase or sale.

 Quantitative Growth. The growth sleeve is managed similar to the core sleeve but against a growth index. This sleeve normally invests primarily in common stocks of companies with smaller market capitalizations that are listed on U.S. exchanges. The team’s quantitative investment process begins with a proprietary alpha model which blends behavioral factors (e.g., human behaviors and biases) and intrinsic valuation factors (e.g., tangible measures of a company’s underlying worth). The team utilizes a risk model for portfolio construction, with constraints at the individual security and industry levels to manage exposures relative to the benchmark. Additionally, all investment recommendations are thoroughly vetted at the individual company level to confirm the investment rationale and suitability before a purchase or sale.

 Managed Volatility. The Managed Volatility sleeve selects primarily common stocks of smaller-cap companies which in aggregate offer lower forecast risk and lower levels of correlation among the individual stocks. This focus may result in the sleeve outperforming the general securities market during periods of flat or negative market performance, and underperforming the general securities market during periods of strong positive market performance. This strategy utilizes both a quantitative and fundamental research process to make individual security and sector selection decisions.

The allocation of fund assets among the sleeves discussed above is set from time to time, may vary in size significantly from sleeve to sleeve and may periodically be adjusted through a collaborative effort among the portfolio managers. In addition to common stocks and other equity securities, the fund may invest a substantial portion of its assets in securities issued in initial public offerings (IPOs). The fund may invest up to 15% of its assets in non-U.S. securities, except that it may invest without limit in American Depositary Receipts (ADRs). The fund may also invest a portion of its assets in real estate investment trusts (REITs). In order to gain exposure to desired asset classes or securities, or for hedging or other investment purposes, the fund may also utilize foreign currency exchange contracts, options, stock index futures contracts, warrants and other derivative instruments. Although the fund did not invest significantly in derivative instruments as of the end of its most recent fiscal year, it may do so at any time.
Summary of Definition of Rule 35d-1 Term in Fund Name [Text Block] fnd_NmRule35d1TermDfnSmryTextBlock As of the date of this prospectus, the fund considers smaller market capitalization companies to be companies with market capitalizations that are smaller than the largest company in the fund’s benchmark, the Russell 2000 Index (approximately $14.2 billion as of June 30, 2026).
Rule 35d-1 Eighty Percent Investment Policy [Text Block] fnd_NmRule35d1EightyPctInvstmntPlcyTextBlock Under normal circumstances, the fund invests at least 80% of its net assets (plus borrowings made for investment purposes) in companies with smaller market capitalizations.
Strategy Portfolio Concentration [Text] oef_StrategyPortfolioConcentration Under normal circumstances, the fund invests at least 80% of its net assets (plus borrowings made for investment purposes) in companies with smaller market capitalizations.
Bar Chart and Performance Table [Heading] oef_BarChartAndPerformanceTableHeading Performance Information
Performance Narrative [Text Block] oef_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] oef_PerformanceInformationIllustratesVariabilityOfReturns The bar chart and table below provide some indication of the potential risks of investing in the fund.
Performance Additional Market Index [Text] oef_PerformanceAdditionalMarketIndex The Russell 2000® Index is a free float-adjusted market capitalization-weighted index of the 2,000 smallest 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] oef_PerformanceAvailabilityPhone 800-243-1574
Performance Availability Website Address [Text] oef_PerformanceAvailabilityWebSiteAddress virtus.com
Performance Past Does Not Indicate Future [Text] oef_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] oef_BarChartHeading Calendar year total returns for Institutional Class Shares 
Bar Chart Does Not Reflect Sales Loads [Text] oef_BarChartDoesNotReflectSalesLoads Returns do not reflect sales charges applicable to other share classes and would be lower if they did.
Bar Chart Closing [Text Block] oef_BarChartClosingTextBlock
        

Best Quarter:

2020, Q4:

23.60%

Worst Quarter:

2020, Q1:

-28.46%

Year to Date (9/30/2026):

16.25%
Performance Table Heading oef_PerformanceTableHeading Average Annual Total Returns (for the periods ended 12/31/25)
Index No Deduction for Fees, Expenses, or Taxes [Text] oef_IndexNoDeductionForFeesExpensesTaxes (reflects no deduction for fees, expenses or taxes)
Performance Table Uses Highest Federal Rate oef_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 Institutional Class 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 oef_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] oef_PerformanceTableOneClassOfAfterTaxShown After-tax returns are shown only for Institutional Class Shares; after-tax returns for other classes will vary.
Performance Table Closing [Text Block] oef_PerformanceTableClosingTextBlock

The Wilshire 5000 Total Market Index (formerly known as the FT Wilshire 5000 Index) is a broad-based free-float market capitalization-weighted index that aims to capture 100% of the U.S. investable market capitalization. The index is calculated on a total return basis with dividends reinvested. The index is unmanaged and not available for direct investment.

The Russell 2000® Index is a free float-adjusted market capitalization-weighted index of the 2,000 smallest 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 Institutional Class 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 Small-Cap Fund | Principal Risks  
Risk/Return: oef_RiskReturnAbstract  
Risk [Text Block] oef_RiskTextBlock

Principal Risks

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 (in alphabetical order after the first six risks).
Virtus Small-Cap Fund | Risk Lose Money [Member]  
Risk/Return: oef_RiskReturnAbstract  
Risk [Text Block] oef_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 Small-Cap Fund | Market Volatility Risk  
Risk/Return: oef_RiskReturnAbstract  
Risk [Text Block] oef_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), geopolitical risk, acts of terrorism, the spread of infectious illness or other public health issue, recessions, tariffs and other restrictions on trade, or the threat or potential of one or more such events and developments, 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 Small-Cap Fund | Issuer Risk  
Risk/Return: oef_RiskReturnAbstract  
Risk [Text Block] oef_RiskTextBlock

> Issuer Risk: The fund will be affected by factors specific to the issuers of securities and other instruments in which the fund invests, including actual or perceived changes in the financial condition or business prospects of such issuers.
Virtus Small-Cap Fund | Equity Securities Risk  
Risk/Return: oef_RiskReturnAbstract  
Risk [Text Block] oef_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 Small-Cap Fund | Foreign Investing Risk  
Risk/Return: oef_RiskReturnAbstract  
Risk [Text Block] oef_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 Small-Cap Fund | Counterparty Risk  
Risk/Return: oef_RiskReturnAbstract  
Risk [Text Block] oef_RiskTextBlock

> Counterparty Risk: There is risk that a party upon whom the fund relies to complete a transaction will default.
Virtus Small-Cap Fund | Credit Risk  
Risk/Return: oef_RiskReturnAbstract  
Risk [Text Block] oef_RiskTextBlock

> Credit Risk: If the issuer of a debt instrument fails to pay interest or principal in a timely manner, or negative perceptions exist in the market of the issuer’s ability to make such payments, the price of the security may decline.
Virtus Small-Cap Fund | Currency Rate Risk  
Risk/Return: oef_RiskReturnAbstract  
Risk [Text Block] oef_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 Small-Cap Fund | Depositary Receipts Risk  
Risk/Return: oef_RiskReturnAbstract  
Risk [Text Block] oef_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 Small-Cap Fund | Derivatives Risk  
Risk/Return: oef_RiskReturnAbstract  
Risk [Text Block] oef_RiskTextBlock

> Derivatives Risk: Derivatives and other similar instruments (collectively referred to in this section as “derivatives”) may include, among other things, futures, options, forwards, and swap agreements, and may be used in order to hedge portfolio risks, create leverage or attempt to increase returns. Investments in derivatives may result in increased volatility and the fund may incur a loss greater than its principal investment.
Virtus Small-Cap Fund | Focused Investment Risk  
Risk/Return: oef_RiskReturnAbstract  
Risk [Text Block] oef_RiskTextBlock

> Focused Investment Risk: To the extent the fund focuses its investments on a limited number of issuers, sectors, industries, geographic regions or portfolio themes, it may be subject to increased risk and volatility.
Virtus Small-Cap Fund | IPO Risk  
Risk/Return: oef_RiskReturnAbstract  
Risk [Text Block] oef_RiskTextBlock

> IPO Risk: Securities purchased in initial public offerings have no trading history, limited issuer information and increased volatility.
Virtus Small-Cap Fund | Leverage Risk  
Risk/Return: oef_RiskReturnAbstract  
Risk [Text Block] oef_RiskTextBlock

> Leverage Risk: When the fund leverages its portfolio by borrowing or by engaging in certain types of transactions or instruments, including derivatives, the fund may be less liquid, may liquidate positions at an unfavorable time, and the volatility of the fund’s value may increase.
Virtus Small-Cap Fund | Liquidity Risk  
Risk/Return: oef_RiskReturnAbstract  
Risk [Text Block] oef_RiskTextBlock

> Liquidity Risk: Certain instruments may be difficult or impossible to sell at a time and price beneficial to the fund.
Virtus Small-Cap Fund | Portfolio Turnover Risk  
Risk/Return: oef_RiskReturnAbstract  
Risk [Text Block] oef_RiskTextBlock

> Portfolio Turnover Risk: The fund’s principal investment strategies may result in a high portfolio turnover rate. See the “Portfolio Turnover” section above for more information about the impact that portfolio turnover can have on your investment.
Virtus Small-Cap Fund | Preferred Stocks Risk  
Risk/Return: oef_RiskReturnAbstract  
Risk [Text Block] oef_RiskTextBlock

> Preferred Stocks Risk: Preferred stocks may decline in price, fail to pay dividends when expected, or be illiquid.
Virtus Small-Cap Fund | Real Estate Investment Risk  
Risk/Return: oef_RiskReturnAbstract  
Risk [Text Block] oef_RiskTextBlock

> Real Estate Investment Risk: The fund may be negatively affected by changes in real estate values or economic conditions, credit risk and interest rate fluctuations, changes in the value of the underlying real estate and defaults by lessees and/or borrowers.
Virtus Small-Cap Fund | Redemption Risk  
Risk/Return: oef_RiskReturnAbstract  
Risk [Text Block] oef_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. The effects of taxable gains resulting from large redemptions of fund shares would particularly impact non-redeeming shareholders who do not hold their fund shares in a tax-advantaged or tax-exempt vehicle. Such large shareholder redemptions, which may occur rapidly or unexpectedly, may cause a fund to sell portfolio securities at times when it would not otherwise do so, which may negatively impact the fund’s net asset value and liquidity. In addition, a large redemption could result in the fund’s current expenses being allocated over a smaller asset base, leading to an increase in the fund’s expense ratio.
Virtus Small-Cap Fund | Small and Medium Market Capitalization Companies Risk  
Risk/Return: oef_RiskReturnAbstract  
Risk [Text Block] oef_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.

Please see “More Information About Risks of Investing in the Funds” in the fund’s prospectus for a more detailed description of the fund’s risks.
Virtus Small-Cap Fund | Wilshire 5000 Total Market Index  
Risk/Return: oef_RiskReturnAbstract  
Average Annual Return, Label [Optional Text] oef_AverageAnnualReturnLabel Wilshire 5000 Total Market Index
Average Annual Return, Percent oef_AvgAnnlRtrPct 17.13%
Average Annual Return, Percent oef_AvgAnnlRtrPct 13.40%
Average Annual Return, Percent oef_AvgAnnlRtrPct 14.45%
Average Annual Return, Percent oef_AvgAnnlRtrPct 13.75%
Performance Inception Date oef_PerfInceptionDate Aug. 22, 2018
Virtus Small-Cap Fund | Russell 2000® Index  
Risk/Return: oef_RiskReturnAbstract  
Average Annual Return, Label [Optional Text] oef_AverageAnnualReturnLabel Russell 2000® Index
Average Annual Return, Percent oef_AvgAnnlRtrPct 12.81%
Average Annual Return, Percent oef_AvgAnnlRtrPct 6.09%
Average Annual Return, Percent oef_AvgAnnlRtrPct 9.62%
Average Annual Return, Percent oef_AvgAnnlRtrPct 6.53%
Performance Inception Date oef_PerfInceptionDate Aug. 22, 2018
Virtus Small-Cap Fund | Class A Shares  
Risk/Return: oef_RiskReturnAbstract  
Trading Symbol dei_TradingSymbol AZBAX
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) oef_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice 5.50%
Maximum Deferred Sales Charge (as a percentage of Offering Price) oef_MaximumDeferredSalesChargeOverOfferingPrice 0.00%
Management Fees (as a percentage of Assets) oef_ManagementFeesOverAssets 0.60%
Distribution and Service (12b-1) Fees oef_DistributionAndService12b1FeesOverAssets 0.25%
Other Expenses (as a percentage of Assets): oef_OtherExpensesOverAssets 0.34%
Expenses (as a percentage of Assets) oef_ExpensesOverAssets 1.19%
Fee Waiver or Reimbursement oef_FeeWaiverOrReimbursementOverAssets (0.02%) [1]
Net Expenses (as a percentage of Assets) oef_NetExpensesOverAssets 1.17% [1]
Expense Example, with Redemption, 1 Year oef_ExpenseExampleYear01 $ 663
Expense Example, with Redemption, 3 Years oef_ExpenseExampleYear03 905
Expense Example, with Redemption, 5 Years oef_ExpenseExampleYear05 1,167
Expense Example, with Redemption, 10 Years oef_ExpenseExampleYear10 1,912
Expense Example, No Redemption, 1 Year oef_ExpenseExampleNoRedemptionYear01 663
Expense Example, No Redemption, 3 Years oef_ExpenseExampleNoRedemptionYear03 905
Expense Example, No Redemption, 5 Years oef_ExpenseExampleNoRedemptionYear05 1,167
Expense Example, No Redemption, 10 Years oef_ExpenseExampleNoRedemptionYear10 $ 1,912
Average Annual Return, Label [Optional Text] oef_AverageAnnualReturnLabel Return Before Taxes
Average Annual Return, Percent oef_AvgAnnlRtrPct 2.15%
Average Annual Return, Percent oef_AvgAnnlRtrPct 6.06%
Average Annual Return, Percent oef_AvgAnnlRtrPct 9.34%
Virtus Small-Cap Fund | Class C Shares  
Risk/Return: oef_RiskReturnAbstract  
Trading Symbol dei_TradingSymbol AZBCX
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) oef_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice 0.00%
Maximum Deferred Sales Charge (as a percentage of Offering Price) oef_MaximumDeferredSalesChargeOverOfferingPrice 1.00% [2]
Management Fees (as a percentage of Assets) oef_ManagementFeesOverAssets 0.60%
Distribution and Service (12b-1) Fees oef_DistributionAndService12b1FeesOverAssets 1.00%
Other Expenses (as a percentage of Assets): oef_OtherExpensesOverAssets 0.38%
Expenses (as a percentage of Assets) oef_ExpensesOverAssets 1.98%
Fee Waiver or Reimbursement oef_FeeWaiverOrReimbursementOverAssets (0.06%) [1]
Net Expenses (as a percentage of Assets) oef_NetExpensesOverAssets 1.92% [1]
Expense Example, with Redemption, 1 Year oef_ExpenseExampleYear01 $ 295
Expense Example, with Redemption, 3 Years oef_ExpenseExampleYear03 616
Expense Example, with Redemption, 5 Years oef_ExpenseExampleYear05 1,062
Expense Example, with Redemption, 10 Years oef_ExpenseExampleYear10 2,301
Expense Example, No Redemption, 1 Year oef_ExpenseExampleNoRedemptionYear01 195
Expense Example, No Redemption, 3 Years oef_ExpenseExampleNoRedemptionYear03 616
Expense Example, No Redemption, 5 Years oef_ExpenseExampleNoRedemptionYear05 1,062
Expense Example, No Redemption, 10 Years oef_ExpenseExampleNoRedemptionYear10 $ 2,301
Average Annual Return, Label [Optional Text] oef_AverageAnnualReturnLabel Return Before Taxes
Average Annual Return, Percent oef_AvgAnnlRtrPct 7.31%
Average Annual Return, Percent oef_AvgAnnlRtrPct 6.46%
Average Annual Return, Percent oef_AvgAnnlRtrPct 9.13%
Virtus Small-Cap Fund | Institutional Class Shares  
Risk/Return: oef_RiskReturnAbstract  
Trading Symbol dei_TradingSymbol AZBIX
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) oef_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice 0.00%
Maximum Deferred Sales Charge (as a percentage of Offering Price) oef_MaximumDeferredSalesChargeOverOfferingPrice 0.00%
Management Fees (as a percentage of Assets) oef_ManagementFeesOverAssets 0.60%
Distribution and Service (12b-1) Fees oef_DistributionAndService12b1FeesOverAssets 0.00%
Other Expenses (as a percentage of Assets): oef_OtherExpensesOverAssets 0.36%
Expenses (as a percentage of Assets) oef_ExpensesOverAssets 0.96%
Fee Waiver or Reimbursement oef_FeeWaiverOrReimbursementOverAssets (0.14%) [1]
Net Expenses (as a percentage of Assets) oef_NetExpensesOverAssets 0.82% [1]
Expense Example, with Redemption, 1 Year oef_ExpenseExampleYear01 $ 84
Expense Example, with Redemption, 3 Years oef_ExpenseExampleYear03 292
Expense Example, with Redemption, 5 Years oef_ExpenseExampleYear05 517
Expense Example, with Redemption, 10 Years oef_ExpenseExampleYear10 1,165
Expense Example, No Redemption, 1 Year oef_ExpenseExampleNoRedemptionYear01 84
Expense Example, No Redemption, 3 Years oef_ExpenseExampleNoRedemptionYear03 292
Expense Example, No Redemption, 5 Years oef_ExpenseExampleNoRedemptionYear05 517
Expense Example, No Redemption, 10 Years oef_ExpenseExampleNoRedemptionYear10 $ 1,165
Year to Date Return, Label [Optional Text] oef_YearToDateReturnLabel Year to Date
Bar Chart, Year to Date Return, Date oef_BarChartYearToDateReturnDate Sep. 30, 2026
Bar Chart, Year to Date Return oef_BarChartYearToDateReturn 16.25%
Highest Quarterly Return, Label [Optional Text] oef_HighestQuarterlyReturnLabel Best Quarter
Highest Quarterly Return, Date oef_BarChartHighestQuarterlyReturnDate Dec. 31, 2020
Highest Quarterly Return oef_BarChartHighestQuarterlyReturn 23.60%
Lowest Quarterly Return, Label [Optional Text] oef_LowestQuarterlyReturnLabel Worst Quarter
Lowest Quarterly Return, Date oef_BarChartLowestQuarterlyReturnDate Mar. 31, 2020
Lowest Quarterly Return oef_BarChartLowestQuarterlyReturn (28.46%)
Average Annual Return, Label [Optional Text] oef_AverageAnnualReturnLabel Return Before Taxes
Average Annual Return, Percent oef_AvgAnnlRtrPct 8.51%
Average Annual Return, Percent oef_AvgAnnlRtrPct 7.65%
Average Annual Return, Percent oef_AvgAnnlRtrPct 10.34%
Annual Return [Percent] oef_AnnlRtrPct 15.46%
Annual Return [Percent] oef_AnnlRtrPct 21.22%
Annual Return [Percent] oef_AnnlRtrPct (9.06%)
Annual Return [Percent] oef_AnnlRtrPct 24.35%
Annual Return [Percent] oef_AnnlRtrPct 16.98%
Annual Return [Percent] oef_AnnlRtrPct 19.24%
Annual Return [Percent] oef_AnnlRtrPct (18.11%)
Annual Return [Percent] oef_AnnlRtrPct 14.13%
Annual Return [Percent] oef_AnnlRtrPct 19.54%
Annual Return [Percent] oef_AnnlRtrPct 8.51%
Virtus Small-Cap Fund | Institutional Class Shares | After Taxes on Distributions  
Risk/Return: oef_RiskReturnAbstract  
Average Annual Return, Label [Optional Text] oef_AverageAnnualReturnLabel Return After Taxes on Distributions
Average Annual Return, Percent oef_AvgAnnlRtrPct 7.31%
Average Annual Return, Percent oef_AvgAnnlRtrPct 5.81%
Average Annual Return, Percent oef_AvgAnnlRtrPct 8.67%
Virtus Small-Cap Fund | Institutional Class Shares | After Taxes on Distributions and Sales  
Risk/Return: oef_RiskReturnAbstract  
Average Annual Return, Label [Optional Text] oef_AverageAnnualReturnLabel Return After Taxes on Distributions and Sale of Fund Shares
Average Annual Return, Percent oef_AvgAnnlRtrPct 5.91%
Average Annual Return, Percent oef_AvgAnnlRtrPct 5.70%
Average Annual Return, Percent oef_AvgAnnlRtrPct 8.00%
Virtus Small-Cap Fund | Class R6 Shares  
Risk/Return: oef_RiskReturnAbstract  
Trading Symbol dei_TradingSymbol ASCFX
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) oef_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice 0.00%
Maximum Deferred Sales Charge (as a percentage of Offering Price) oef_MaximumDeferredSalesChargeOverOfferingPrice 0.00%
Management Fees (as a percentage of Assets) oef_ManagementFeesOverAssets 0.60%
Distribution and Service (12b-1) Fees oef_DistributionAndService12b1FeesOverAssets 0.00%
Other Expenses (as a percentage of Assets): oef_OtherExpensesOverAssets 0.27%
Expenses (as a percentage of Assets) oef_ExpensesOverAssets 0.87%
Fee Waiver or Reimbursement oef_FeeWaiverOrReimbursementOverAssets (0.10%) [1]
Net Expenses (as a percentage of Assets) oef_NetExpensesOverAssets 0.77% [1]
Expense Example, with Redemption, 1 Year oef_ExpenseExampleYear01 $ 79
Expense Example, with Redemption, 3 Years oef_ExpenseExampleYear03 268
Expense Example, with Redemption, 5 Years oef_ExpenseExampleYear05 472
Expense Example, with Redemption, 10 Years oef_ExpenseExampleYear10 1,063
Expense Example, No Redemption, 1 Year oef_ExpenseExampleNoRedemptionYear01 79
Expense Example, No Redemption, 3 Years oef_ExpenseExampleNoRedemptionYear03 268
Expense Example, No Redemption, 5 Years oef_ExpenseExampleNoRedemptionYear05 472
Expense Example, No Redemption, 10 Years oef_ExpenseExampleNoRedemptionYear10 $ 1,063
Average Annual Return, Label [Optional Text] oef_AverageAnnualReturnLabel Return Before Taxes
Average Annual Return, Percent oef_AvgAnnlRtrPct 8.56%
Average Annual Return, Percent oef_AvgAnnlRtrPct 7.70%
Average Annual Return, Percent oef_AvgAnnlRtrPct 7.40%
Performance Inception Date oef_PerfInceptionDate Aug. 22, 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 (federal, state or otherwise), tax reclaim expenses, leverage and borrowing expenses (such as commitment, amendment and renewal expenses on credit or redemption facilities), interest, brokerage commissions, depositary receipt program fees, expenses incurred in connection with any merger or reorganization, expenses incurred in connection with any meeting of the fund's shareholders, unusual or infrequently occurring expenses, litigation expenses (including expenses for responding to document requests for litigation to which the fund is not a party), acquired fund fees and expenses, and dividend expenses, if any) so that such expenses do not exceed 1.17% for Class A Shares, 1.92% for Class C Shares, 0.82% for Institutional Class Shares and 0.77% for Class R6 Shares through October 31, 2027. Prior to October 31, 2027, 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.