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Risk/Return: rr_RiskReturnAbstract  
Registrant Name dei_EntityRegistrantName USAA MUTUAL FUNDS TRUST
Prospectus Date rr_ProspectusDate Jun. 29, 2020
Tax Exempt Money Market Fund  
Risk/Return: rr_RiskReturnAbstract  
Risk/Return [Heading] rr_RiskReturnHeading USAA Tax Exempt Money Market Fund Summary
Objective [Heading] rr_ObjectiveHeading Investment Objective
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock

The USAA Tax Exempt Money Market Fund (the "Fund") provides investors with interest income that is exempt from federal income tax and has a further objective of preserving capital and maintaining liquidity.
Expense [Heading] rr_ExpenseHeading Fees and Expenses
Expense Narrative [Text Block] rr_ExpenseNarrativeTextBlock

The tables below describe the fees and expenses that you may pay, directly and indirectly, to invest in the Fund.
Shareholder Fees Caption [Text] rr_ShareholderFeesCaption Shareholder Fees
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 July 31, 2021
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. The Example also assumes that your investment has a 5% return each year, the Fund's operating expenses remain the same, and the expense limitation agreement for the Fund is not continued beyond its expiration date. Although your actual costs may be higher or lower, based on these assumptions, your costs would be:
Strategy [Heading] rr_StrategyHeading Principal Investment Strategy
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock

The Fund invests primarily in high-quality securities, the interest of which is excludable from gross income for federal income tax purposes (referred to herein as "tax-exempt securities"), with remaining maturities of 397 days or less. During normal market conditions, at least 80% of the Fund's net assets will consist of tax-exempt securities.

In addition, during normal market conditions, at least 80% of the Fund's annual net investment income will be tax-exempt and excludable from the calculation of the federal alternative minimum tax ("AMT") for individual taxpayers. This policy may be changed only by a shareholder vote.

In pursuing its investment objective and implementing its investment strategies, the Fund will comply with Rule 2a-7 under the Investment Company Act of 1940, as amended ("Rule 2a-7"). Accordingly, the Fund restricts its investments to instruments that meet certain maturity and quality requirements under Rule 2a-7. Generally, such investments will be limited to a security with a remaining maturity of 397 calendar days or less that is determined to present minimal credit risk; issued by a money market fund; or issued or guaranteed by the U.S. government or any agency or instrumentality thereof.
Risk [Heading] rr_RiskHeading Principal Risks
Risk Narrative [Text Block] rr_RiskNarrativeTextBlock

The Fund's investments are subject to the following principal risks:

Stable Net Asset Value Risk – You could lose money by investing in the Fund. Although the Fund seeks to preserve the value of your investment at $1 per share, it cannot guarantee it will do so. The Fund may impose a fee upon the sale of your shares or may temporarily suspend your ability to sell shares if the Fund's liquidity falls below required minimums because of certain market conditions or other factors. An investment in the Fund is not a deposit in a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation ("FDIC") or any other government agency. The Fund's sponsor has no legal obligation to provide financial support to the Fund, and you should not expect that the sponsor will provide financial support to the Fund at any time.

Credit Risk – The fixed-income securities held in the Fund's portfolio are subject to credit risk, which is the possibility that an issuer of a fixed-income security will fail to make timely interest and/or principal payments on its securities or that negative market perceptions of the issuer's ability to make such payments will cause the price of that security to decline. The Fund accepts some credit risk as a recognized means to enhance an investor's return. All fixed-income securities, varying from the highest quality to the very speculative, have some degree of credit risk.

Interest Rate Risk – The Fund also is subject to the possibility that the value of its investments will fluctuate because of changes in interest rates, changes in supply of and demand for tax-exempt securities, or other market factors.

Decisions by the U.S. Federal Reserve (also known as the "Fed") regarding interest rate and monetary policy, which can be difficult to predict and sometimes change direction suddenly in response to economic and market events, can have a significant effect on the value of fixed-income securities as well as the overall strength of the U.S. economy. Precise interest rate predictions are difficult to make, and interest rates may change unexpectedly and dramatically in response to extreme changes in market or economic conditions. As a result, the value of fixed income-securities may vary widely under certain market conditions.

Structural Risk – Some tax-exempt securities are subject to special risks due to their unique structure. For instance, variable-rate demand notes ("VRDNs") generally are long-term municipal bonds combined with a demand feature, which represents the right to sell the instrument back to the remarketer or liquidity provider, usually a bank, for repurchase on short notice, normally one day or seven days. Because the demand feature is dependent upon the bank, the Fund will only purchase VRDNs of this type where it believes that the banks would be able to honor their guarantees on the demand feature. Some VRDNs, sometimes referred to as "structured instruments" or "synthetic instruments," are created by combining an intermediate- or long-term municipal bond with a right to sell the instrument back to the remarketer or liquidity provider for repurchase on short notice, referred to as a "tender option." However, the tender option usually is subject to a conditional guarantee, which means that the bank is not required to pay under the guarantee if there is a default by the municipality or if certain other events occur. Because there is the risk that the Fund will not be able to exercise the demand feature at all times, the Fund will not purchase a synthetic instrument of this type unless the Fund believes there is minimal risk that the Fund will not be able to exercise the tender option at all times. The Fund will not purchase a synthetic instrument unless counsel for the issuer has issued an opinion that interest paid on the instrument is entitled to tax-exempt treatment.

Management Risk – The Fund is actively managed, and the investment techniques and risk analyses used by the Fund's portfolio managers may not produce the desired results.

Liquidity Fees and Gates – The Fund may impose liquidity fees on redemptions and/or temporarily suspend redemptions (gates) if the Fund's weekly liquid assets fall below certain thresholds, such as during times of market stress. The imposition of a liquidity fee would reduce the amount you would receive upon redemption of your shares of the Fund. The imposition of a redemption gate also would delay your ability to redeem your investments in the Fund.

Under applicable federal securities laws, money market funds that qualify as "retail" (retail money market funds) or "government" (government money market funds) are permitted to utilize amortized cost to value their portfolio securities and to transact at a stable $1 NAV per share. The Fund operates as a retail money market fund in compliance with the requirements of Rule 2a-7; and as a retail money market fund, shares of the Fund are available for sale only to accounts that are beneficially owned by natural persons.

Any investment involves risk, and there is no assurance that the Fund's objective will be achieved.

Risk Lose Money [Text] rr_RiskLoseMoney You could lose money by investing in the Fund.
Risk Not Insured Depository Institution [Text] rr_RiskNotInsuredDepositoryInstitution An investment in the Fund is not a deposit in a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation ("FDIC") or any other government agency.
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading Performance
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock

The following bar chart and table are intended to help you understand the risks of investing in the Fund. The bar chart provides some indication of the risks of investing in the Fund and illustrates the Fund's volatility by showing how performance has varied from year to year for each full calendar year over the past 10 years. The table shows the Fund's average annual total returns for the periods indicated.

Performance data for the classes varies based on differences in their fee and expense structures. Remember, historical performance (before and after taxes) does not necessarily indicate what will happen in the future. The Fund's most current performance information is available on the Fund's website at usaa.com (effective on or about September 8, 2020, performance information may be found at vcm.com) or by calling (800) 235-8396.

Performance Information Illustrates Variability of Returns [Text] rr_PerformanceInformationIllustratesVariabilityOfReturns The bar chart provides some indication of the risks of investing in the Fund and illustrates the Fund's volatility by showing how performance has varied from year to year for each full calendar year over the past 10 years. The table shows the Fund's average annual total returns for the periods indicated.
Performance Availability Phone [Text] rr_PerformanceAvailabilityPhone (800) 235-8396
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress usaa.com (effective on or about September 8, 2020, performance information may be found at vcm.com)
Performance Past Does Not Indicate Future [Text] rr_PerformancePastDoesNotIndicateFuture Performance data for the classes varies based on differences in their fee and expense structures. Remember, historical performance (before and after taxes) does not necessarily indicate what will happen in the future.
Bar Chart [Heading] rr_BarChartHeading RISK/RETURN BAR CHART Annual Returns for Periods Ended December 31
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock

The year-to-date return of the Fund Shares as of March 31, 2020, was 0.30%.

During the periods shown in the chart: Returns Quarter ended
Highest Quarter Return 0.31% June 30, 2019
Lowest Quarter Return 0.00% March 31, 2016

Performance Table Heading rr_PerformanceTableHeading AVERAGE ANNUAL TOTAL RETURNS For Periods Ended December 31, 2019
Tax Exempt Money Market Fund | None or same as Fund Name  
Risk/Return: rr_RiskReturnAbstract  
(fees paid directly from your investment) rr_ShareholderFeeOther none
Management Fee rr_ManagementFeesOverAssets 0.28%
Distribution and/or Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses rr_OtherExpensesOverAssets 0.28%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 0.56% [1]
1 Year rr_ExpenseExampleYear01 $ 57
3 Years rr_ExpenseExampleYear03 179
5 Years rr_ExpenseExampleYear05 313
10 Years rr_ExpenseExampleYear10 $ 701
2010 rr_AnnualReturn2010 0.01%
2011 rr_AnnualReturn2011 0.01%
2012 rr_AnnualReturn2012 0.04%
2013 rr_AnnualReturn2013 0.02%
2014 rr_AnnualReturn2014 0.01%
2015 rr_AnnualReturn2015 0.02%
2016 rr_AnnualReturn2016 0.19%
2017 rr_AnnualReturn2017 0.38%
2018 rr_AnnualReturn2018 0.95%
2019 rr_AnnualReturn2019 1.03%
Year to Date Return, Label rr_YearToDateReturnLabel year-to-date return
Bar Chart, Year to Date Return, Date rr_BarChartYearToDateReturnDate Mar. 31, 2020
Bar Chart, Year to Date Return rr_BarChartYearToDateReturn 0.30%
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Highest Quarter Return
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Jun. 30, 2019
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 0.31%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Lowest Quarter Return
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Mar. 31, 2016
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn none
1 Year rr_AverageAnnualReturnYear01 1.03%
5 Years rr_AverageAnnualReturnYear05 0.51%
10 Years rr_AverageAnnualReturnYear10 0.26%
[1] Victory Capital Management Inc., the Fund's investment adviser ("Adviser") has contractually agreed to waive its management fee and/or reimburse expenses so that the total annual operating expenses (excluding acquired fund fees and expenses, interest, taxes, brokerage commissions, capitalized expenses, and other extraordinary expenses) do not exceed an annual rate of 0.56% of the Fund through at least July 31, 2021. The Adviser is permitted to recoup advisory fees waived and expenses reimbursed for up to three years after the fiscal year in which the waiver or reimbursement took place, subject to the lesser of any operating expense limits in effect at the time of: (a) the original waiver or expense reimbursement; or (b) the recoupment, after giving effect to the recoupment amount. The Total Annual Fund Operating Expenses after Reimbursement shown above may differ from the stated expense limitation amount. This agreement may only be terminated by the Fund's Board of Trustees.