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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 (the “Fund”),

a series of Virtus Asset Trust

 

Supplement dated November 30, 2021 to the Summary Prospectus

and the Virtus Asset Trust Statutory Prospectus,

each dated April 28, 2021, as supplemented

 

Important Notice to Investors

 

Effective December 1, 2021, the Fund’s investment adviser, Virtus Fund Advisers, LLC, will implement a new expense limitation arrangement to further limit the Fund’s expenses. The change is described in more detail below.

 

Virtus Seix Investment Grade Tax-Exempt Bond Fund
Risk/Return [Heading] rr_RiskReturnHeading Virtus Seix Investment Grade Tax-Exempt Bond 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, 2023
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 in 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 by, Year, Caption [Text] rr_ExpenseExampleByYearCaption Sold
Expense Example, No Redemption, By Year, Caption [Text] rr_ExpenseExampleNoRedemptionByYearCaption Held
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 0.26%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.02%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 1.03% [1]
Less: Fee Waiver and/or Expense Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.34%) [2]
Total Annual Fund Operating Expenses After Expense Reimbursement rr_NetExpensesOverAssets 0.69% [1],[2]
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 344
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 561
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 796
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 1,470
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 344
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 561
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 796
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 1,470
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 0.32%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.02%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 0.84% [1]
Less: Fee Waiver and/or Expense Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.30%) [2]
Total Annual Fund Operating Expenses After Expense Reimbursement rr_NetExpensesOverAssets 0.54% [1],[2]
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 55
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 238
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 436
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 1,009
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 55
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 238
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 436
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 1,009
[1] The Total Annual Fund Operating Expenses do not correlate to the ratio of expenses to average net assets appearing in 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 0.67% for Class A Shares and 0.52% for Class I Shares through 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, and any in effect at the time of recapture, after repayment is taken into account.