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Virtus SGA International Growth Fund  
Risk/Return: rr_RiskReturnAbstract  
Risk/Return [Heading] rr_RiskReturnHeading Virtus SGA International Growth Fund
Objective [Heading] rr_ObjectiveHeading Investment Objective
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock

The fund has an investment objective of seeking to provide long-term capital appreciation.
Expense [Heading] rr_ExpenseHeading Fees and Expenses
Expense Narrative [Text Block] rr_ExpenseNarrativeTextBlock

The tables below illustrate the fees and expenses that you may pay if you buy, hold and sell shares of the fund. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the tables and examples below. You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $50,000 in Virtus Funds. Information about these and other discounts is available: (i) from your financial professional or other financial intermediary; (ii) under “Sales Charges” on page 124 of the fund’s statutory prospectus; (iii) with respect to purchase of shares through specific intermediaries, in Appendix A to the fund’s statutory prospectus, entitled “Intermediary Sales Charge Discounts and Waivers;” and (iv) under “Alternative Purchase Arrangements” on page 122 of the fund’s statement of additional information.

The Virtus SGA International Growth Fund, a series of Virtus Asset Trust, is the successor of the RidgeWorth International Equity Fund, a series of RidgeWorth Funds (“Predecessor Fund”), resulting from a reorganization of the Predecessor Fund with and into the fund.
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 44% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 44.00%
Expense Breakpoint Discounts [Text] rr_ExpenseBreakpointDiscounts You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $50,000 in Virtus Funds.
Expense Breakpoint, Minimum Investment Required [Amount] rr_ExpenseBreakpointMinimumInvestmentRequiredAmount $ 50,000
Expense Example [Heading] rr_ExpenseExampleHeading Example
Expense Example Narrative [Text Block] rr_ExpenseExampleNarrativeTextBlock

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

The fund will invest in securities of issuers located throughout the world. Under normal circumstances, the fund will invest at least 80% of its assets in equity securities of issuers organized, headquartered or doing a substantial amount of business outside the U.S.

As of the date of this prospectus, the fund’s subadviser, Sustainable Growth Advisers, LP (“SGA”), considers an issuer that has at least 50% of its assets or derives at least 50% of its revenue from business outside the U.S. as doing a substantial amount of business outside the U.S. SGA uses an investment process to identify companies that it believes have a high degree of predictability, strong profitability and above average earnings and cash flow growth. SGA selects investments for the fund’s portfolio that it believes have superior long-term earnings prospects and attractive valuation. To the extent consistent with the fund’s investment objective and strategies, the subadviser will consider as an element of its investment research and decision making processes for the fund any environmental, social and/or governance (“ESG”) factors that the subadviser believes may influence risks and opportunities of companies under consideration. However, the pursuit of ESG-related goals is not the fund’s investment objective, nor one of its investment strategies. Therefore, ESG factors by themselves are not expected to determine investment decisions for the fund. The fund’s equity investments may include common stocks, preferred stocks, securities convertible into or exchangeable for common stocks, and depositary receipts. The fund may invest in companies of all market capitalizations. The fund will allocate its assets among various regions and countries, including emerging markets. From time to time, the fund may have a significant portion of its assets invested in the securities of companies in only a few countries or regions. Although the fund seeks investments across a number of sectors, from time to time, the fund may have significant positions in particular sectors.

SGA will sell a portfolio holding when it believes the security’s fundamentals deteriorate, its valuation is no longer attractive, or a better investment opportunity arises.
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.

> 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.

> 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.

> Geographic Concentration Risk. A fund that focuses its investments in a particular geographic location will be sensitive to financial, economic, political and other events negatively affecting that location and may cause the value of the fund to decrease, perhaps significantly.

> 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, 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.

> Convertible Securities Risk. The value of a convertible security may decline as interest rates rise and/or vary with fluctuations in the market value of the underlying securities. The security may be called for redemption at a time and/or price unfavorable to the fund.

> 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.

> 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.

> ESG Risk. The fund’s consideration of ESG factors may result in the fund declining to buy certain securities when it might otherwise be advantageous to do so, or may choose to sell securities for ESG reasons when it might otherwise be disadvantageous for it to do so.

> 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.

> Preferred Stocks Risk. Preferred stocks may decline in price, fail to pay dividends when expected, or be illiquid.

> 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.

> 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.

> 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.
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 fund has adopted the past performance of the Predecessor Fund as its own. The Predecessor Fund and the fund have identical investment objectives and strategies.

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 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 (includes returns of a predecessor fund)
Bar Chart Does Not Reflect Sales Loads [Text] rr_BarChartDoesNotReflectSalesLoads Returns do not reflect sales charges applicable to other share classes and would be lower if they did.
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock
        

Best Quarter:

2020, Q2:

20.17%

Worst Quarter:

2020, Q1:

-16.51%

Year to Date (3/31/2022):

-9.54%
Performance Table Heading rr_PerformanceTableHeading Average Annual Total Returns
Performance Table Does Reflect Sales Loads rr_PerformanceTableDoesReflectSalesLoads Returns reflect deduction of maximum sales charges and full redemption at end of periods shown.
Performance Table Uses Highest Federal Rate rr_PerformanceTableUsesHighestFederalRate After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. After-tax returns are shown only for Class I Shares; after-tax returns for other classes will vary. Actual after-tax returns depend on the investor’s tax situation and may differ from those shown. After-tax returns are not relevant to investors who hold fund shares in tax-deferred accounts or to shares held by non-taxable entities.
Performance Table Not Relevant to Tax Deferred rr_PerformanceTableNotRelevantToTaxDeferred Actual after-tax returns depend on the investor’s tax situation and may differ from those shown. After-tax returns are not relevant to investors who hold fund shares in tax-deferred accounts or to shares held by non-taxable entities.
Performance Table One Class of after Tax Shown [Text] rr_PerformanceTableOneClassOfAfterTaxShown After-tax returns are shown only for Class I Shares; after-tax returns for other classes will vary.
Performance Table Narrative rr_PerformanceTableNarrativeTextBlock

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

The MSCI 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.

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 SGA International Growth Fund | MSCI All Country World ex USA Index (net)  
Risk/Return: rr_RiskReturnAbstract  
Index No Deduction for Fees, Expenses, Taxes [Text] rr_IndexNoDeductionForFeesExpensesTaxes (net) (reflects no deduction for fees, expenses or taxes)
Label rr_AverageAnnualReturnLabel MSCI All Country World ex USA Index (net) (reflects no deduction for fees, expenses or taxes)
1 Year rr_AverageAnnualReturnYear01 7.82%
5 Years rr_AverageAnnualReturnYear05 9.61%
10 Years rr_AverageAnnualReturnYear10 7.28%
Virtus SGA International Growth Fund | Class A  
Risk/Return: rr_RiskReturnAbstract  
Trading Symbol dei_TradingSymbol SCIIX
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 0.85%
Distribution and Shareholder Servicing (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Other Expenses rr_OtherExpensesOverAssets 0.45%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 1.55%
Less: Fee Waiver and/or Expense Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.23%) [1]
Total Annual Fund Operating Expenses After Expense Reimbursement rr_NetExpensesOverAssets 1.32% [1]
Expenses Not Correlated to Ratio Due to Acquired Fund Fees [Text] rr_ExpensesNotCorrelatedToRatioDueToAcquiredFundFees  
1 Year rr_ExpenseExampleYear01 $ 677
3 Years rr_ExpenseExampleYear03 991
5 Years rr_ExpenseExampleYear05 1,328
10 Years rr_ExpenseExampleYear10 2,276
1 Year rr_ExpenseExampleNoRedemptionYear01 677
3 Years rr_ExpenseExampleNoRedemptionYear03 991
5 Years rr_ExpenseExampleNoRedemptionYear05 1,328
10 Years rr_ExpenseExampleNoRedemptionYear10 $ 2,276
Label rr_AverageAnnualReturnLabel Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 2.40%
5 Years rr_AverageAnnualReturnYear05 14.31%
10 Years rr_AverageAnnualReturnYear10 10.45%
Virtus SGA International Growth Fund | Class I  
Risk/Return: rr_RiskReturnAbstract  
Trading Symbol dei_TradingSymbol STITX
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 0.85%
Distribution and Shareholder Servicing (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses rr_OtherExpensesOverAssets 0.43%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 1.28%
Less: Fee Waiver and/or Expense Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.21%) [1]
Total Annual Fund Operating Expenses After Expense Reimbursement rr_NetExpensesOverAssets 1.07% [1]
Expenses Not Correlated to Ratio Due to Acquired Fund Fees [Text] rr_ExpensesNotCorrelatedToRatioDueToAcquiredFundFees  
1 Year rr_ExpenseExampleYear01 $ 109
3 Years rr_ExpenseExampleYear03 385
5 Years rr_ExpenseExampleYear05 682
10 Years rr_ExpenseExampleYear10 1,527
1 Year rr_ExpenseExampleNoRedemptionYear01 109
3 Years rr_ExpenseExampleNoRedemptionYear03 385
5 Years rr_ExpenseExampleNoRedemptionYear05 682
10 Years rr_ExpenseExampleNoRedemptionYear10 $ 1,527
Annual Return 2012 rr_AnnualReturn2012 21.44%
Annual Return 2013 rr_AnnualReturn2013 20.91%
Annual Return 2014 rr_AnnualReturn2014 (7.73%)
Annual Return 2015 rr_AnnualReturn2015 3.03%
Annual Return 2016 rr_AnnualReturn2016 0.02%
Annual Return 2017 rr_AnnualReturn2017 31.58%
Annual Return 2018 rr_AnnualReturn2018 (7.69%)
Annual Return 2019 rr_AnnualReturn2019 28.61%
Annual Return 2020 rr_AnnualReturn2020 23.17%
Annual Return 2021 rr_AnnualReturn2021 8.59%
Year to Date Return, Label rr_YearToDateReturnLabel Year to Date
Bar Chart, Year to Date Return, Date rr_BarChartYearToDateReturnDate Mar. 31, 2022
Bar Chart, Year to Date Return rr_BarChartYearToDateReturn (9.54%)
Label rr_HighestQuarterlyReturnLabel Best Quarter
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Jun. 30, 2020
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 20.17%
Label rr_LowestQuarterlyReturnLabel Worst Quarter
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Mar. 31, 2020
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (16.51%)
Label rr_AverageAnnualReturnLabel Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 8.59%
5 Years rr_AverageAnnualReturnYear05 15.88%
10 Years rr_AverageAnnualReturnYear10 11.30%
Virtus SGA International Growth Fund | Class I | After Taxes on Distributions  
Risk/Return: rr_RiskReturnAbstract  
Label rr_AverageAnnualReturnLabel Return After Taxes on Distributions
1 Year rr_AverageAnnualReturnYear01 6.74%
5 Years rr_AverageAnnualReturnYear05 12.80%
10 Years rr_AverageAnnualReturnYear10 8.95%
Virtus SGA International Growth Fund | Class I | 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 6.43%
5 Years rr_AverageAnnualReturnYear05 12.12%
10 Years rr_AverageAnnualReturnYear10 8.70%
Virtus SGA International Growth Fund | Class R6  
Risk/Return: rr_RiskReturnAbstract  
Trading Symbol dei_TradingSymbol SCIZX
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 0.85%
Distribution and Shareholder Servicing (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses rr_OtherExpensesOverAssets 0.34%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 1.19%
Less: Fee Waiver and/or Expense Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.24%) [1]
Total Annual Fund Operating Expenses After Expense Reimbursement rr_NetExpensesOverAssets 0.95% [1]
Expenses Not Correlated to Ratio Due to Acquired Fund Fees [Text] rr_ExpensesNotCorrelatedToRatioDueToAcquiredFundFees  
1 Year rr_ExpenseExampleYear01 $ 97
3 Years rr_ExpenseExampleYear03 354
5 Years rr_ExpenseExampleYear05 631
10 Years rr_ExpenseExampleYear10 1,422
1 Year rr_ExpenseExampleNoRedemptionYear01 97
3 Years rr_ExpenseExampleNoRedemptionYear03 354
5 Years rr_ExpenseExampleNoRedemptionYear05 631
10 Years rr_ExpenseExampleNoRedemptionYear10 $ 1,422
Label rr_AverageAnnualReturnLabel Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 8.74%
5 Years rr_AverageAnnualReturnYear05 15.98%
Since Inception rr_AverageAnnualReturnSinceInception 13.59%
Inception Date rr_AverageAnnualReturnInceptionDate Sep. 01, 2015
[1]

The fund’s investment adviser has contractually agreed to limit the fund’s total operating expenses (excluding certain expenses, such as front-end or contingent deferred sales charges, taxes, leverage and borrowing expenses (such as commitment, amendment and renewal expenses on credit or redemption facilities), interest, brokerage commissions, expenses incurred in connection with any merger or reorganization, unusual or infrequently occurring expenses (such as litigation), acquired fund fees and expenses, and dividend expenses, if any) so that such expenses do not exceed 1.32% for Class A Shares, 1.07% for Class I Shares, 0.95% for Class R6 Shares, April 30, 2023. 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.