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Virtus Seix Investment Grade Tax-Exempt Bond Fund  
Risk/Return: rr_RiskReturnAbstract  
Supplement to Prospectus [Text Block] rr_SupplementToProspectusTextBlock

Virtus Seix Investment Grade Tax-Exempt Bond 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


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 Seix Investment Grade Tax-Exempt Bond Fund
Expense Narrative [Text Block] rr_ExpenseNarrativeTextBlock

Virtus Seix Investment Grade Tax-Exempt Bond Fund


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
Expenses Not Correlated to Ratio Due to Acquired Fund Fees [Text] rr_ExpensesNotCorrelatedToRatioDueToAcquiredFundFees The Total Annual Fund Operating Expenses do not correlate to the ratio of expenses to average net assets appearing the Financial Highlights tables, which tables reflect only the operating expenses of the fund and do not include acquired fund fees and expenses.
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 Seix Investment Grade Tax-Exempt Bond Fund | Class A  
Risk/Return: rr_RiskReturnAbstract  
Management Fees rr_ManagementFeesOverAssets 0.50%
Distribution and Shareholder Servicing (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Other Expenses rr_OtherExpensesOverAssets 0.25%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.01%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 1.01% [1]
Less: Fee Waiver and/or Expense Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.27%) [2]
Total Annual Fund Operating Expenses After Expense Reimbursement rr_NetExpensesOverAssets 0.74% [2]
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 348
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 562
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 792
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 1,453
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 348
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 562
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 792
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 1,453
Virtus Seix Investment Grade Tax-Exempt Bond Fund | Class I  
Risk/Return: rr_RiskReturnAbstract  
Management Fees rr_ManagementFeesOverAssets 0.50%
Distribution and Shareholder Servicing (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses rr_OtherExpensesOverAssets 0.30%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.01%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 0.81% [1]
Less: Fee Waiver and/or Expense Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.22%) [2]
Total Annual Fund Operating Expenses After Expense Reimbursement rr_NetExpensesOverAssets 0.59% [2]
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 60
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 237
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 428
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 981
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 60
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 237
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 428
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 981
[1] The Total Annual Fund Operating Expenses do not correlate to the ratio of expenses to average net assets appearing the Financial Highlights tables, which tables reflect only the operating expenses of the fund and do not include acquired fund fees and expenses.
[2] 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 A Shares and 0.58% for Class I 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.