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Virtus SGA International Growth Fund  
Risk/Return: rr_RiskReturnAbstract  
Supplement to Prospectus [Text Block] rr_SupplementToProspectusTextBlock

Virtus SGA International Growth Fund,
a series of Virtus Asset Trust


Supplement dated November 22, 2019, to the Summary Prospectus
and the Virtus Asset Trust Statutory Prospectus,
each dated April 30, 2019, each as supplemented


Important Notice to Investors


Virtus SGA International Growth Fund


Effective December 1, 2019, the fund’s investment adviser, Virtus Fund Advisers, LLC, will implement more favorable expense limitation arrangements. These changes are described in more detail below.
Risk/Return [Heading] rr_RiskReturnHeading Virtus SGA International Growth Fund
Expense Narrative [Text Block] rr_ExpenseNarrativeTextBlock

Under “Fees and Expenses” in the fund’s summary prospectus and the summary section of the statutory prospectus, the “Annual Fund Operating Expenses” table and associated footnotes will be replaced with the following:
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 Apr. 30, 2021
Expense Example Narrative [Text Block] rr_ExpenseExampleNarrativeTextBlock

Under “Fees and Expenses,” the “Example” table is hereby replaced with the following:
Expense Example Closing [Text Block] rr_ExpenseExampleClosingTextBlock

Investors should retain this supplement with the Prospectuses for future reference.
Virtus SGA International Growth Fund | Class A  
Risk/Return: rr_RiskReturnAbstract  
Management Fees rr_ManagementFeesOverAssets 0.85%
Distribution and Shareholder Servicing (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Other Expenses rr_OtherExpensesOverAssets 0.34%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 1.44%
Less: Fee Waivers and/or Expense Reimbursements rr_FeeWaiverOrReimbursementOverAssets (0.05%) [1]
Total Annual Fund Operating Expenses After Expense Reimbursement rr_NetExpensesOverAssets 1.39% [1]
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 708
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 1,000
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 1,312
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 2,196
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 708
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 1,000
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 1,312
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 2,196
Virtus SGA International Growth Fund | Class I  
Risk/Return: rr_RiskReturnAbstract  
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 Waivers and/or Expense Reimbursements rr_FeeWaiverOrReimbursementOverAssets (0.05%) [1]
Total Annual Fund Operating Expenses After Expense Reimbursement rr_NetExpensesOverAssets 1.14% [1]
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 116
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 373
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 650
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 1,439
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 116
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 373
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 650
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 1,439
Virtus SGA International Growth Fund | Class R6  
Risk/Return: rr_RiskReturnAbstract  
Management Fees rr_ManagementFeesOverAssets 0.85%
Distribution and Shareholder Servicing (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses rr_OtherExpensesOverAssets 0.26%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 1.11%
Less: Fee Waivers and/or Expense Reimbursements rr_FeeWaiverOrReimbursementOverAssets (0.07%) [1]
Total Annual Fund Operating Expenses After Expense Reimbursement rr_NetExpensesOverAssets 1.04% [1]
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 106
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 346
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 605
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 1,345
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 106
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 346
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 605
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 1,345
[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 1.39% for Class A Shares, 1.14% for Class I Shares and 1.04% for Class R6 Shares through April 30, 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.