485BPOS

As filed with the Securities and Exchange Commission on May 15, 2018.

1933 Act File No. 33-65572
1940 Act File No. 811-7852

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM N-1A

REGISTRATION STATEMENT

UNDER

THE SECURITIES ACT OF 1933 ☒

Pre-Effective Amendment No. ___

Post-Effective Amendment No. 152

and

REGISTRATION STATEMENT

UNDER

THE INVESTMENT COMPANY ACT OF 1940 ☒

Amendment No. 153

USAA MUTUAL FUNDS TRUST

(Exact Name of Registrant as Specified in Charter)

9800 Fredericksburg Road, San Antonio, TX 78288

(Address of Principal Executive Offices) (Zip Code)

Registrant’s Telephone Number, including Area Code

(210) 498-0226

Jon K. Hadfield, Secretary

USAA MUTUAL FUNDS TRUST
9800 Fredericksburg Road

San Antonio, TX 78288-0227

(Name and Address of Agent for Service)

It is proposed that this filing will become effective under Rule 485

□	immediately upon filing pursuant to paragraph (b)
☒	on May 1, 2018 pursuant to paragraph (b)
□	60 days after filing pursuant to paragraph (a)(1)
□	on (date) pursuant to paragraph (a)(1)
□	75 days after filing pursuant to paragraph (a)(2)
□	on (date) pursuant to paragraph (a)(2)

If appropriate, check the following box:

□ This post-effective amendment designates a new effective date for a previously filed post-effective amendment.

SIGNATURES

Pursuant to the requirements of the Securities Act of 1933 and the Investment Company Act of 1940, the Registrant meets all requirements for effectiveness of this registration statement pursuant to Rule 485(b) under the Securities Act and has duly caused this registration statement to be signed on its behalf by the undersigned, duly authorized, in the city of San Antonio, and state of Texas, on the 15th day of May, 2018.

USAA Mutual Funds Trust

By: *

Daniel S. McNamara
President

Pursuant to the requirements of the Securities Act of 1933, this amendment to the registration statement has been signed below by the following persons in the capacities and on the date(s) indicated.

(Signature)	(Title)	(Date)
* Robert L. Mason	Chairman of the Board of Trustees
* Daniel S. McNamara	Vice Chairman of the Board of Trustees and President (Principal Executive Officer)
* James K. De Vries	Treasurer (Principal Financial and Accounting Officer)
* Dawn M. Hawley	Trustee
* Jefferson C. Boyce	Trustee
* Paul L. McNamara	Trustee
* Richard Y. Newton III	Trustee
* Barbara B. Ostdiek	Trustee
* Michael F. Reimherr	Trustee

*By : /S/ KRISTEN MILLAN

* Kristen Millan, under the Powers of Attorney dated April 18, 2018, incorporated herein and filed under Post Effective Amendment No. 151, with the Securities and Exchange Commission on April 26, 2018.

EXHIBIT INDEX

101. INS	XBRL Instance Document
101.SCH	XBRL Taxonomy Extension Schema
101.DEF	XBRL Taxonomy Extension Definition Linkbase
101.LAB	XBRL Taxonomy Extension Label Linkbase
101.PRE	XBRL Taxonomy Extension Presentation Linkbase
101.CAL	XBRL Taxonomy Extension Calculation Linkbase

I-1

XML

Label	Element	Value
Risk/Return:	rr_RiskReturnAbstract
Document Type	dei_DocumentType	485BPOS
Period End Date	dei_DocumentPeriodEndDate	Dec. 31, 2017
Registrant Name	dei_EntityRegistrantName	USAA MUTUAL FUNDS TRUST
CIK	dei_EntityCentralIndexKey	0000908695
Amendment Flag	dei_AmendmentFlag	false
Document Created Date	dei_DocumentCreationDate	May 01, 2018
Effective Date	dei_DocumentEffectiveDate	May 01, 2018
Prospectus Date	rr_ProspectusDate	May 01, 2018

XML

SP 500 Index Fund

USAA S&P 500 Index Fund Summary

Investment Objective

The USAA S&P 500 Index Fund (the Fund) seeks to match, before fees and expenses, the performance of the stocks composing the S&P 500 Index¹. The S&P 500 Index emphasizes stocks of large U.S. companies.

¹"Standard & Poor's^®," "S&P^®," "S&P 500^®," "Standard & Poor's 500," and "500" are trademarks of The McGraw-Hill Companies, Inc. and have been licensed for our use.

Fees and Expenses

The tables below describe the fees and expenses that you may pay, directly and indirectly, to invest in the Fund. The annual fund operating expenses for the Member Shares and Reward Shares are based on expenses incurred during the Fund's most recently completed fiscal year.

Shareholder Fees

(fees paid directly from your investment)

Shareholder Fees - SP 500 Index Fund - USD ($)	Member Shares		Reward Shares
Account Maintenace Fee (for Fund account balances below $10,000)	$ 10	[1]	none

Annual Fund Operating Expenses

(expenses that you pay each year as a percentage of the value of your investment)

Annual Fund Operating Expenses - SP 500 Index Fund		Member Shares	Reward Shares
Management Fee		0.10%	0.10%
Distribution and/or Service (12b-1) Fees		none	none
Other Expenses		0.17%	0.08%
Total Annual Fund Operating Expenses		0.27%	0.18%
Reimbursement from Adviser	[1]	(0.02%)	(0.03%)
Total Annual Fund Operating Expenses after Reimbursement		0.25%	0.15%

Example

This example is intended to help you compare the cost of investing in this Fund with the cost of investing in other mutual funds. Although your actual costs may be higher or lower, you would pay the following expenses on a $10,000 investment, assuming (1) a 5% annual return, (2) the Fund's operating expenses remain the same, (3) you redeem all of your shares at the end of the periods shown, and (4) the expense reimbursement arrangements for the Member Shares and Reward Shares are not continued beyond one year.

Expense Example - SP 500 Index Fund - USD ($)	1 Year	3 Years	5 Years	10 Years
Member Shares	26	85	150	341
Reward Shares	15	55	98	227

Portfolio Turnover

The Fund pays transaction costs, including 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 shares of the Fund are held in a taxable account. These costs, which are not reflected in the Annual Fund Operating Expenses or in the Example, affect the Fund's performance.

For the most recent fiscal year, the Fund's portfolio turnover rate was 3% of the average value of its whole portfolio.

Principal Investment Strategy

The Fund's principal investment strategy is, under normal market conditions, to invest at least 80% of the Fund's assets in the common stocks of companies composing the S&P 500 Index. This strategy may be changed upon 60 days' written notice to shareholders.

In seeking to track the performance of the S&P 500 Index, the Fund's subadviser, Northern Trust Investments, Inc. (NTI), attempts to allocate the Fund's investments among stocks in approximately the same weightings as the S&P 500 Index, beginning with the stocks that make up the larger portion of the index's value. The Fund is rebalanced as required to reflect index changes and to accommodate Fund cash flows. NTI may exclude or remove any S&P stock from the Fund if NTI believes that the stock is illiquid or has been impaired by financial conditions or other extraordinary events.

Principal Risks

Any investment involves risk, and there is no assurance that the Fund's objective will be achieved. As you consider an investment in the Fund, you also should take into account your tolerance for the daily fluctuations of the financial markets and whether you can afford to leave your money in the Fund for long periods of time to ride out down periods. As with other mutual funds, losing money is a risk of investing in the Fund.

The equity securities in the Fund's portfolio are subject to stock market risk. A company's stock price in general may decline over short or even extended periods, regardless of the success or failure of the company's operations. Stock markets tend to run in cycles, with periods when stock prices generally go up and periods when stock prices generally go down. Equity securities tend to be more volatile than debt securities.

While the Fund attempts to match the S&P 500 Index as closely as possible, the ability of the Fund to meet its investment objective depends to some extent on the cash flow in and out of the Fund. The Fund's performance may be affected by factors such as the size of the Fund's portfolio, transaction costs, management fees and expenses, and brokerage commissions and fees. Changes in the Fund's cash flow may affect how closely the Fund will track the S&P 500 Index.

An investment in the Fund is not a deposit in USAA Federal Savings Bank, or any other bank, and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.

Performance

The following bar chart and table are intended to help you understand the risks of investing in the Fund. The Fund has two classes of shares: Member Shares and Reward Shares. The bar chart provides some indication of the risks of investing in the Fund and illustrates the Member Shares' volatility and performance from year to year for each full calendar year over the past 10 years. The table shows how the average annual total returns of the share classes for the periods indicated compared to those of the Fund's benchmark. Performance reflects any expense limitations in effect during the periods shown.

Remember, historical performance (before and after taxes) does not necessarily indicate what will happen in the future. For the Fund's most current performance information, log on to usaa.com or call (800) 531-USAA (8722) or (210) 531-8722.

RISK/RETURN BAR CHART
Annual Returns for Periods Ended December 31

During the periods shown in the chart:	Returns	Quarter ended
Highest Quarter Return	15.91%	June 30, 2009
Lowest Quarter Return	-21.99%	December 31, 2008
Year-to-Date Return	-0.82%	March 31, 2018

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. In certain situations, the return after taxes on distributions and sale of fund shares may be higher than the other return amounts. A higher after-tax return may result when a capital loss occurs upon redemption and translates into an assumed tax deduction that benefits the shareholder. The actual after-tax returns depend on your tax situation and may differ from those shown. If you hold your shares through a tax-deferred arrangement, such as an individual retirement account (IRA) or 401(k) plan, the after-tax returns shown in the table are not relevant to you. Please note that after-tax returns are only shown for the Member Shares and may differ for the Reward Shares.

AVERAGE ANNUAL TOTAL RETURNS
For Periods Ended December 31, 2017

Average Annual Total Returns - SP 500 Index Fund		Past1 Year	Past5 Years	Past10 Years
Member Shares	[1]	21.53%	15.49%	8.24%
Member Shares | Return After Taxes on Distributions	[1]	21.03%	14.97%	7.76%
Member Shares | Return After Taxes on Distributions and Sale of Fund Shares	[1]	12.54%	12.40%	6.63%
Reward Shares		21.64%	15.61%	8.36%
S&P® 500 Index (reflects no deduction for fees, expenses, or taxes)		21.96%	15.79%	8.49%

[1] *USAA Shareholder Account Services, the Fund's transfer agent, assesses a $10 annual account maintenance fee to allocate part of the fixed costs of maintaining shareholder accounts. The transfer agent deducts $2.50 per quarter from your account to pay the annual fee.

[1] The Investment Adviser has agreed, through April 30, 2019, to make payments or waive management, administration, and other fees to limit the expenses of the Member Shares and Reward Shares of the Fund so that the Total Annual Fund Operating Expenses (exclusive of commission recapture, expense offset arrangements, acquired fund fees and expenses, and extraordinary expenses) do not exceed an annual rate of 0.25% of the Member Shares' and 0.15% of the Reward Shares' average daily net assets, respectively. This reimbursement arrangement may not be changed or terminated during this time period without approval of the Fund's Board of Trustees and may be changed or terminated by the Investment Adviser at any time after April 30, 2019.

[1] Excludes $10 account maintenance fee, which is waived for accounts of $10,000 or more.

XML

Label

Element

Value

Risk/Return:

rr_RiskReturnAbstract

Registrant Name

dei_EntityRegistrantName

USAA MUTUAL FUNDS TRUST

Prospectus Date

rr_ProspectusDate

May 01, 2018

SP 500 Index Fund

Risk/Return:

rr_RiskReturnAbstract

Risk/Return [Heading]

rr_RiskReturnHeading

USAA S&P 500 Index Fund Summary

Objective [Heading]

rr_ObjectiveHeading

Investment Objective

Objective, Primary [Text Block]

rr_ObjectivePrimaryTextBlock

The USAA S&P 500 Index Fund (the Fund) seeks to match, before fees and expenses, the performance of the stocks composing the S&P 500 Index¹. The S&P 500 Index emphasizes stocks of large U.S. companies.

¹"Standard & Poor's^®," "S&P^®," "S&P 500^®," "Standard & Poor's 500," and "500" are trademarks of The McGraw-Hill Companies, Inc. and have been licensed for our use.

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. The annual fund operating expenses for the Member Shares and Reward Shares are based on expenses incurred during the Fund's most recently completed fiscal year.

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)

Fee Waiver or Reimbursement over Assets, Date of Termination

rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination

April 30, 2019

Portfolio Turnover [Heading]

rr_PortfolioTurnoverHeading

Portfolio Turnover

Portfolio Turnover [Text Block]

rr_PortfolioTurnoverTextBlock

The Fund pays transaction costs, including 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 shares of the Fund are held in a taxable account. These costs, which are not reflected in the Annual Fund Operating Expenses or in the Example, affect the Fund's performance.

For the most recent fiscal year, the Fund's portfolio turnover rate was 3% of the average value of its whole portfolio.

Portfolio Turnover, Rate

rr_PortfolioTurnoverRate

3.00%

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 this Fund with the cost of investing in other mutual funds. Although your actual costs may be higher or lower, you would pay the following expenses on a $10,000 investment, assuming (1) a 5% annual return, (2) the Fund's operating expenses remain the same, (3) you redeem all of your shares at the end of the periods shown, and (4) the expense reimbursement arrangements for the Member Shares and Reward Shares are not continued beyond one year.

Strategy [Heading]

rr_StrategyHeading

Principal Investment Strategy

Strategy Narrative [Text Block]

rr_StrategyNarrativeTextBlock

The Fund's principal investment strategy is, under normal market conditions, to invest at least 80% of the Fund's assets in the common stocks of companies composing the S&P 500 Index. This strategy may be changed upon 60 days' written notice to shareholders.

In seeking to track the performance of the S&P 500 Index, the Fund's subadviser, Northern Trust Investments, Inc. (NTI), attempts to allocate the Fund's investments among stocks in approximately the same weightings as the S&P 500 Index, beginning with the stocks that make up the larger portion of the index's value. The Fund is rebalanced as required to reflect index changes and to accommodate Fund cash flows. NTI may exclude or remove any S&P stock from the Fund if NTI believes that the stock is illiquid or has been impaired by financial conditions or other extraordinary events.

Risk [Heading]

rr_RiskHeading

Principal Risks

Risk Narrative [Text Block]

rr_RiskNarrativeTextBlock

Any investment involves risk, and there is no assurance that the Fund's objective will be achieved. As you consider an investment in the Fund, you also should take into account your tolerance for the daily fluctuations of the financial markets and whether you can afford to leave your money in the Fund for long periods of time to ride out down periods. As with other mutual funds, losing money is a risk of investing in the Fund.

The equity securities in the Fund's portfolio are subject to stock market risk. A company's stock price in general may decline over short or even extended periods, regardless of the success or failure of the company's operations. Stock markets tend to run in cycles, with periods when stock prices generally go up and periods when stock prices generally go down. Equity securities tend to be more volatile than debt securities.

While the Fund attempts to match the S&P 500 Index as closely as possible, the ability of the Fund to meet its investment objective depends to some extent on the cash flow in and out of the Fund. The Fund's performance may be affected by factors such as the size of the Fund's portfolio, transaction costs, management fees and expenses, and brokerage commissions and fees. Changes in the Fund's cash flow may affect how closely the Fund will track the S&P 500 Index.

An investment in the Fund is not a deposit in USAA Federal Savings Bank, or any other bank, and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.

Risk Lose Money [Text]

rr_RiskLoseMoney

As with other mutual funds, losing money is a risk of investing in the Fund.

Risk Not Insured Depository Institution [Text]

rr_RiskNotInsuredDepositoryInstitution

An investment in the Fund is not a deposit in USAA Federal Savings Bank, or any other bank, and is not insured or guaranteed by the Federal Deposit Insurance Corporation 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 Fund has two classes of shares: Member Shares and Reward Shares. The bar chart provides some indication of the risks of investing in the Fund and illustrates the Member Shares' volatility and performance from year to year for each full calendar year over the past 10 years. The table shows how the average annual total returns of the share classes for the periods indicated compared to those of the Fund's benchmark. Performance reflects any expense limitations in effect during the periods shown.

Remember, historical performance (before and after taxes) does not necessarily indicate what will happen in the future. For the Fund's most current performance information, log on to usaa.com or call (800) 531-USAA (8722) or (210) 531-8722.

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 Member Shares' volatility and performance from year to year for each full calendar year over the past 10 years. The table shows how the average annual total returns of the share classes for the periods indicated compared to those of the Fund's benchmark.

Performance Availability Phone [Text]

rr_PerformanceAvailabilityPhone

(800) 531-USAA (8722) or (210) 531-8722

Performance Availability Website Address [Text]

rr_PerformanceAvailabilityWebSiteAddress

usaa.com

Performance Past Does Not Indicate Future [Text]

rr_PerformancePastDoesNotIndicateFuture

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

During the periods shown in the chart:	Returns	Quarter ended
Highest Quarter Return	15.91%	June 30, 2009
Lowest Quarter Return	-21.99%	December 31, 2008
Year-to-Date Return	-0.82%	March 31, 2018

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. In certain situations, the return after taxes on distributions and sale of fund shares may be higher than the other return amounts. A higher after-tax return may result when a capital loss occurs upon redemption and translates into an assumed tax deduction that benefits the shareholder. The actual after-tax returns depend on your tax situation and may differ from those shown. If you hold your shares through a tax-deferred arrangement, such as an individual retirement account (IRA) or 401(k) plan, the after-tax returns shown in the table are not relevant to you. Please note that after-tax returns are only shown for the Member Shares and may differ for the Reward Shares.

Performance Table Heading

rr_PerformanceTableHeading

AVERAGE ANNUAL TOTAL RETURNS
For Periods Ended December 31, 2017

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.

Performance Table Not Relevant to Tax Deferred

rr_PerformanceTableNotRelevantToTaxDeferred

If you hold your shares through a tax-deferred arrangement, such as an individual retirement account (IRA) or 401(k) plan, the after-tax returns shown in the table are not relevant to you.

Performance Table One Class of after Tax Shown [Text]

rr_PerformanceTableOneClassOfAfterTaxShown

Please note that after-tax returns are only shown for the Member Shares and may differ for the Reward Shares.

Performance Table Explanation after Tax Higher

rr_PerformanceTableExplanationAfterTaxHigher

In certain situations, the return after taxes on distributions and sale of fund shares may be higher than the other return amounts. A higher after-tax return may result when a capital loss occurs upon redemption and translates into an assumed tax deduction that benefits the shareholder.

SP 500 Index Fund | Member Shares

Risk/Return:

rr_RiskReturnAbstract

Account Maintenace Fee (for Fund account balances below $10,000)

rr_MaximumAccountFee

$ 10

^[1]

Management Fee

rr_ManagementFeesOverAssets

0.10%

Distribution and/or Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

none

Other Expenses

rr_OtherExpensesOverAssets

0.17%

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

0.27%

Reimbursement from Adviser

rr_FeeWaiverOrReimbursementOverAssets

(0.02%)

^[2]

Total Annual Fund Operating Expenses after Reimbursement

rr_NetExpensesOverAssets

0.25%

1 Year

rr_ExpenseExampleYear01

$ 26

3 Years

rr_ExpenseExampleYear03

85

5 Years

rr_ExpenseExampleYear05

150

10 Years

rr_ExpenseExampleYear10

$ 341

2008

rr_AnnualReturn2008

(37.13%)

2009

rr_AnnualReturn2009

26.28%

2010

rr_AnnualReturn2010

14.81%

2011

rr_AnnualReturn2011

1.82%

2012

rr_AnnualReturn2012

15.75%

2013

rr_AnnualReturn2013

32.03%

2014

rr_AnnualReturn2014

13.38%

2015

rr_AnnualReturn2015

1.13%

2016

rr_AnnualReturn2016

11.70%

2017

rr_AnnualReturn2017

21.53%

Year to Date Return, Label

rr_YearToDateReturnLabel

Year-to-Date Return

Bar Chart, Year to Date Return, Date

rr_BarChartYearToDateReturnDate

Mar. 31, 2018

Bar Chart, Year to Date Return

rr_BarChartYearToDateReturn

(0.82%)

Highest Quarterly Return, Label

rr_HighestQuarterlyReturnLabel

Highest Quarter Return

Highest Quarterly Return, Date

rr_BarChartHighestQuarterlyReturnDate

Jun. 30, 2009

Highest Quarterly Return

rr_BarChartHighestQuarterlyReturn

15.91%

Lowest Quarterly Return, Label

rr_LowestQuarterlyReturnLabel

Lowest Quarter Return

Lowest Quarterly Return, Date

rr_BarChartLowestQuarterlyReturnDate

Dec. 31, 2008

Lowest Quarterly Return

rr_BarChartLowestQuarterlyReturn

(21.99%)

Past1 Year

rr_AverageAnnualReturnYear01

21.53%

^[3]

Past5 Years

rr_AverageAnnualReturnYear05

15.49%

^[3]

Past10 Years

rr_AverageAnnualReturnYear10

8.24%

^[3]

SP 500 Index Fund | Reward Shares

Risk/Return:

rr_RiskReturnAbstract

Account Maintenace Fee (for Fund account balances below $10,000)

rr_MaximumAccountFee

none

Management Fee

rr_ManagementFeesOverAssets

0.10%

Distribution and/or Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

none

Other Expenses

rr_OtherExpensesOverAssets

0.08%

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

0.18%

Reimbursement from Adviser

rr_FeeWaiverOrReimbursementOverAssets

(0.03%)

^[2]

Total Annual Fund Operating Expenses after Reimbursement

rr_NetExpensesOverAssets

0.15%

1 Year

rr_ExpenseExampleYear01

$ 15

3 Years

rr_ExpenseExampleYear03

55

5 Years

rr_ExpenseExampleYear05

98

10 Years

rr_ExpenseExampleYear10

$ 227

Past1 Year

rr_AverageAnnualReturnYear01

21.64%

Past5 Years

rr_AverageAnnualReturnYear05

15.61%

Past10 Years

rr_AverageAnnualReturnYear10

8.36%

SP 500 Index Fund | Return After Taxes on Distributions | Member Shares

Risk/Return:

rr_RiskReturnAbstract

Past1 Year

rr_AverageAnnualReturnYear01

21.03%

^[3]

Past5 Years

rr_AverageAnnualReturnYear05

14.97%

^[3]

Past10 Years

rr_AverageAnnualReturnYear10

7.76%

^[3]

SP 500 Index Fund | Return After Taxes on Distributions and Sale of Fund Shares | Member Shares

Risk/Return:

rr_RiskReturnAbstract

Past1 Year

rr_AverageAnnualReturnYear01

12.54%

^[3]

Past5 Years

rr_AverageAnnualReturnYear05

12.40%

^[3]

Past10 Years

rr_AverageAnnualReturnYear10

6.63%

^[3]

SP 500 Index Fund | S&P® 500 Index (reflects no deduction for fees, expenses, or taxes)

Risk/Return:

rr_RiskReturnAbstract

Past1 Year

rr_AverageAnnualReturnYear01

21.96%

Past5 Years

rr_AverageAnnualReturnYear05

15.79%

Past10 Years

rr_AverageAnnualReturnYear10

8.49%

[1] *USAA Shareholder Account Services, the Fund's transfer agent, assesses a $10 annual account maintenance fee to allocate part of the fixed costs of maintaining shareholder accounts. The transfer agent deducts $2.50 per quarter from your account to pay the annual fee.

[2] The Investment Adviser has agreed, through April 30, 2019, to make payments or waive management, administration, and other fees to limit the expenses of the Member Shares and Reward Shares of the Fund so that the Total Annual Fund Operating Expenses (exclusive of commission recapture, expense offset arrangements, acquired fund fees and expenses, and extraordinary expenses) do not exceed an annual rate of 0.25% of the Member Shares' and 0.15% of the Reward Shares' average daily net assets, respectively. This reimbursement arrangement may not be changed or terminated during this time period without approval of the Fund's Board of Trustees and may be changed or terminated by the Investment Adviser at any time after April 30, 2019.

[3] Excludes $10 account maintenance fee, which is waived for accounts of $10,000 or more.

XML

Nasdaq-100 Index

USAA Nasdaq-100 Index Fund Summary

Investment Objective

The USAA Nasdaq-100 Index Fund (the Fund) seeks to match, before fees and expenses, the performance of the stocks composing the Nasdaq-100 Index¹. The Nasdaq-100 Index represents 100 of the largest nonfinancial stocks traded on The Nasdaq Stock Market^®.

¹Nasdaq-100^®, Nasdaq-100 Index^®, and Nasdaq^® are trade or service marks of The Nasdaq Stock Market, Inc. (which with its affiliates are the "Corporations") and have been licensed for our use.

Fees and Expenses

The tables below describe the fees and expenses that you may pay, directly and indirectly, to invest in the Fund. The annual fund operating expenses for the Fund Shares and R6 Shares are based on expenses incurred during the Fund's most recently completed fiscal year.

Shareholder Fees

(fees paid directly from your investment)

Shareholder Fees - Nasdaq-100 Index - USD ($)	Fund Shares	R6 Shares
Shareholder Fee, Other	none	none

Annual Fund Operating Expenses

(expenses that you pay each year as a percentage of the value of your investment)

Annual Fund Operating Expenses - Nasdaq-100 Index	Fund Shares	R6 Shares
Management Fee	0.20%	0.20%
Distribution and/or Service (12b-1) Fees	none	none
Other Expenses	0.31%	0.81%
Total Annual Fund Operating Expenses	0.51%	1.01%
Reimbursement from Adviser		(0.61%)	[1]
Total Annual Fund Operating Expenses after Reimbursement	0.51%	0.40%

Example

This example is intended to help you compare the cost of investing in this Fund with the cost of investing in other mutual funds. Although your actual costs may be higher or lower, you would pay the following expenses on a $10,000 investment, assuming (1) a 5% annual return, (2) the Fund's operating expenses remain the same, (3) you redeem all of your shares at the end of the periods shown, and (4) the expense reimbursement arrangement for the R6 Shares is not continued beyond one year.

Expense Example - Nasdaq-100 Index - USD ($)	1 Year	3 Years	5 Years	10 Years
Fund Shares	52	164	285	640
R6 Shares	41	261	498	1,181

Portfolio Turnover

The Fund pays transaction costs, including 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 shares of the Fund are held in a taxable account. These costs, which are not reflected in the Annual Fund Operating Expenses or in the Example, affect the Fund's performance.

For the most recent fiscal year, the Fund's portfolio turnover rate was 5% of the average value of its whole portfolio.

Principal Investment Strategy

The Fund's principal investment strategy is, under normal market conditions, to invest at least 80% of the Fund's assets in the common stocks of companies composing the Nasdaq-100 Index. This strategy may be changed upon 60 days' written notice to shareholders.

In seeking to track the performance of the Nasdaq-100 Index, the Fund's subadviser, Northern Trust Investments, Inc. (NTI), will normally invest in all the common stocks of companies in the Nasdaq-100 Index in roughly the same proportions as their weightings in the index. While NTI attempts to replicate the index, there may be times when the Fund and the index do not match exactly. At times, NTI may purchase a stock not included in the Nasdaq-100 Index when it believes doing so would be a cost-efficient way of approximating the index's performance, for example, in anticipation of a stock being added to the index. To the extent that the Nasdaq-100 Index concentrates in the securities of a particular industry or group of industries, the Fund may similarly concentrate its investments.

Principal Risks

Any investment involves risk, and there is no assurance that the Fund's objective will be achieved. As you consider an investment in the Fund, you also should take into account your tolerance for the daily fluctuations of the financial markets and whether you can afford to leave your money in the Fund for long periods of time to ride out down periods. As with other mutual funds, losing money is a risk of investing in the Fund.

The equity securities in the Fund's portfolio are subject to stock market risk. A company's stock price in general may decline over short or even extended periods, regardless of the success or failure of the company's operations. Stock markets tend to run in cycles, with periods when stock prices generally go up and periods when stock prices generally go down. Equity securities tend to be more volatile than debt securities. In addition, to the degree the Fund invests in foreign securities, there is a possibility that the value of the Fund's investments in foreign securities will decrease because of unique risks, such as currency exchange-rate fluctuations; foreign market illiquidity; emerging-market risk; increased price volatility; uncertain political conditions; exchange-control regulations; foreign ownership limits; different accounting, reporting, and disclosure requirements; difficulties in obtaining legal judgments; and foreign withholding taxes.

The returns from a specific type of security or sector may trail returns from other asset classes, sectors, or the overall market. For example, the stocks that make up the Nasdaq-100 Index currently are heavily weighted in the technology sectors. High volatility or poor performance of the sectors will directly affect the Fund's performance. Sectors will go through cycles of doing better or worse than stocks or bonds in general. These periods may last for several years.

While the Fund attempts to match the Nasdaq-100 Index as closely as possible, the ability of the Fund to meet its investment objective depends to some extent on the cash flow in and out of the Fund. The Fund's performance may be affected by factors such as the size of the Fund's portfolio, transaction costs, management fees and expenses, and brokerage commissions and fees. Changes in the Fund's cash flow may affect how closely the Fund will track the Nasdaq-100 Index.

The Fund is non-diversified, which means that it may invest a greater percentage of its assets in a single issuer, such as a single stock or bond. Because a relatively high percentage of the Fund's total assets may be invested in the securities of a single issuer or a limited number of issuers, the securities of the Fund may be more sensitive to changes in the market value of a single issuer, a limited number of issuers, or large companies generally. Such a focused investment strategy may increase the volatility of the Fund's investment results because this Fund may be more susceptible to risks associated with a single issuer or economic, political, or regulatory event compared to those of a diversified fund.

An investment in the Fund is not a deposit in USAA Federal Savings Bank, or any other bank, and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.

Performance

The following bar chart and table are intended to help you understand the risks of investing in the Fund. The Fund has two classes of shares: Fund Shares and R6 Shares. The R6 Shares commenced operations on March 1, 2017, and will not present performance information until the share class has one full calendar year of operation. The bar chart provides some indication of the risks of investing in the Fund and illustrates the Fund Shares class's volatility and performance from year to year for each full calendar year over the past 10 years. The table shows how the Fund Shares' average annual total returns for the periods indicated compared to those of the Fund's benchmark index. Performance reflects any expense limitations in effect during the periods shown.

Remember, historical performance (before and after taxes) does not necessarily indicate what will happen in the future. For the Fund's most current performance information, log on to usaa.com or call (800) 531-USAA (8722) or (210) 531-8722.

RISK/RETURN BAR CHART
Annual Returns for Periods Ended December 31

During the periods shown in the chart:	Returns	Quarter ended
Highest Quarter Return	20.95%	March 31, 2012
Lowest Quarter Return	-23.98%	December 31, 2008
Year-to-Date-Return	3.02%	March 31, 2018

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. In certain situations, the return after taxes on distributions and sale of fund shares may be higher than the other return amounts. A higher after-tax return may result when a capital loss occurs upon redemption and translates into an assumed tax deduction that benefits the shareholder. The actual after-tax returns depend on your tax situation and may differ from those shown. If you hold your shares through a tax-deferred arrangement, such as an individual retirement account (IRA) or 401(k) plan, the after-tax returns shown in the table are not relevant to you.

AVERAGE ANNUAL TOTAL RETURNS
For Periods Ended December 31, 2017

Average Annual Total Returns - Nasdaq-100 Index	Past 1 Year	Past 5 Years	Past 10 Years
Fund Shares	32.29%	19.98%	12.29%
Fund Shares | Return After Taxes on Distributions	31.68%	19.66%	12.00%
Fund Shares | Return After Taxes on Distributions and Sale of Fund Shares	18.78%	16.30%	10.23%
Nasdaq-100 Index (reflects no deduction for fees, expenses, or taxes)	32.99%	20.68%	13.05%

[1] The Investment Adviser has agreed, through April 30, 2019, to make payments or waive management, administration, and other fees to limit the expenses of the R6 Shares of the Fund so that the Total Annual Fund Operating Expenses (exclusive of commission recapture, expense offset arrangements, acquired fund fees and expenses, and extraordinary expenses) do not exceed an annual rate of 0.40% of the R6 Shares' average daily net assets. This reimbursement arrangement may not be changed or terminated during this time period without approval of the Fund's Board of Trustees and may be changed or terminated by the Investment Adviser at any time after April 30, 2019.

XML

Label

Element

Value

Risk/Return:

rr_RiskReturnAbstract

Registrant Name

dei_EntityRegistrantName

USAA MUTUAL FUNDS TRUST

Prospectus Date

rr_ProspectusDate

May 01, 2018

Nasdaq-100 Index

Risk/Return:

rr_RiskReturnAbstract

Risk/Return [Heading]

rr_RiskReturnHeading

USAA Nasdaq-100 Index Fund Summary

Objective [Heading]

rr_ObjectiveHeading

Investment Objective

Objective, Primary [Text Block]

rr_ObjectivePrimaryTextBlock

The USAA Nasdaq-100 Index Fund (the Fund) seeks to match, before fees and expenses, the performance of the stocks composing the Nasdaq-100 Index¹. The Nasdaq-100 Index represents 100 of the largest nonfinancial stocks traded on The Nasdaq Stock Market^®.

¹Nasdaq-100^®, Nasdaq-100 Index^®, and Nasdaq^® are trade or service marks of The Nasdaq Stock Market, Inc. (which with its affiliates are the "Corporations") and have been licensed for our use.

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. The annual fund operating expenses for the Fund Shares and R6 Shares are based on expenses incurred during the Fund's most recently completed fiscal year.

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)

Fee Waiver or Reimbursement over Assets, Date of Termination

rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination

April 30, 2019

Portfolio Turnover [Heading]

rr_PortfolioTurnoverHeading

Portfolio Turnover

Portfolio Turnover [Text Block]

rr_PortfolioTurnoverTextBlock

The Fund pays transaction costs, including 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 shares of the Fund are held in a taxable account. These costs, which are not reflected in the Annual Fund Operating Expenses or in the Example, affect the Fund's performance.

For the most recent fiscal year, the Fund's portfolio turnover rate was 5% of the average value of its whole portfolio.

Portfolio Turnover, Rate

rr_PortfolioTurnoverRate

5.00%

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 this Fund with the cost of investing in other mutual funds. Although your actual costs may be higher or lower, you would pay the following expenses on a $10,000 investment, assuming (1) a 5% annual return, (2) the Fund's operating expenses remain the same, (3) you redeem all of your shares at the end of the periods shown, and (4) the expense reimbursement arrangement for the R6 Shares is not continued beyond one year.

Strategy [Heading]

rr_StrategyHeading

Principal Investment Strategy

Strategy Narrative [Text Block]

rr_StrategyNarrativeTextBlock

The Fund's principal investment strategy is, under normal market conditions, to invest at least 80% of the Fund's assets in the common stocks of companies composing the Nasdaq-100 Index. This strategy may be changed upon 60 days' written notice to shareholders.

In seeking to track the performance of the Nasdaq-100 Index, the Fund's subadviser, Northern Trust Investments, Inc. (NTI), will normally invest in all the common stocks of companies in the Nasdaq-100 Index in roughly the same proportions as their weightings in the index. While NTI attempts to replicate the index, there may be times when the Fund and the index do not match exactly. At times, NTI may purchase a stock not included in the Nasdaq-100 Index when it believes doing so would be a cost-efficient way of approximating the index's performance, for example, in anticipation of a stock being added to the index. To the extent that the Nasdaq-100 Index concentrates in the securities of a particular industry or group of industries, the Fund may similarly concentrate its investments.

Risk [Heading]

rr_RiskHeading

Principal Risks

Risk Narrative [Text Block]

rr_RiskNarrativeTextBlock

Any investment involves risk, and there is no assurance that the Fund's objective will be achieved. As you consider an investment in the Fund, you also should take into account your tolerance for the daily fluctuations of the financial markets and whether you can afford to leave your money in the Fund for long periods of time to ride out down periods. As with other mutual funds, losing money is a risk of investing in the Fund.

The equity securities in the Fund's portfolio are subject to stock market risk. A company's stock price in general may decline over short or even extended periods, regardless of the success or failure of the company's operations. Stock markets tend to run in cycles, with periods when stock prices generally go up and periods when stock prices generally go down. Equity securities tend to be more volatile than debt securities. In addition, to the degree the Fund invests in foreign securities, there is a possibility that the value of the Fund's investments in foreign securities will decrease because of unique risks, such as currency exchange-rate fluctuations; foreign market illiquidity; emerging-market risk; increased price volatility; uncertain political conditions; exchange-control regulations; foreign ownership limits; different accounting, reporting, and disclosure requirements; difficulties in obtaining legal judgments; and foreign withholding taxes.

The returns from a specific type of security or sector may trail returns from other asset classes, sectors, or the overall market. For example, the stocks that make up the Nasdaq-100 Index currently are heavily weighted in the technology sectors. High volatility or poor performance of the sectors will directly affect the Fund's performance. Sectors will go through cycles of doing better or worse than stocks or bonds in general. These periods may last for several years.

While the Fund attempts to match the Nasdaq-100 Index as closely as possible, the ability of the Fund to meet its investment objective depends to some extent on the cash flow in and out of the Fund. The Fund's performance may be affected by factors such as the size of the Fund's portfolio, transaction costs, management fees and expenses, and brokerage commissions and fees. Changes in the Fund's cash flow may affect how closely the Fund will track the Nasdaq-100 Index.

The Fund is non-diversified, which means that it may invest a greater percentage of its assets in a single issuer, such as a single stock or bond. Because a relatively high percentage of the Fund's total assets may be invested in the securities of a single issuer or a limited number of issuers, the securities of the Fund may be more sensitive to changes in the market value of a single issuer, a limited number of issuers, or large companies generally. Such a focused investment strategy may increase the volatility of the Fund's investment results because this Fund may be more susceptible to risks associated with a single issuer or economic, political, or regulatory event compared to those of a diversified fund.

An investment in the Fund is not a deposit in USAA Federal Savings Bank, or any other bank, and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.

Risk Lose Money [Text]

rr_RiskLoseMoney

As with other mutual funds, losing money is a risk of investing in the Fund.

Risk Nondiversified Status [Text]

rr_RiskNondiversifiedStatus

The Fund is non-diversified, which means that it may invest a greater percentage of its assets in a single issuer, such as a single stock or bond. Because a relatively high percentage of the Fund's total assets may be invested in the securities of a single issuer or a limited number of issuers, the securities of the Fund may be more sensitive to changes in the market value of a single issuer, a limited number of issuers, or large companies generally. Such a focused investment strategy may increase the volatility of the Fund's investment results because this Fund may be more susceptible to risks associated with a single issuer or economic, political, or regulatory event compared to those of a diversified fund.

Risk Not Insured Depository Institution [Text]

rr_RiskNotInsuredDepositoryInstitution

An investment in the Fund is not a deposit in USAA Federal Savings Bank, or any other bank, and is not insured or guaranteed by the Federal Deposit Insurance Corporation 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 Fund has two classes of shares: Fund Shares and R6 Shares. The R6 Shares commenced operations on March 1, 2017, and will not present performance information until the share class has one full calendar year of operation. The bar chart provides some indication of the risks of investing in the Fund and illustrates the Fund Shares class's volatility and performance from year to year for each full calendar year over the past 10 years. The table shows how the Fund Shares' average annual total returns for the periods indicated compared to those of the Fund's benchmark index. Performance reflects any expense limitations in effect during the periods shown.

Remember, historical performance (before and after taxes) does not necessarily indicate what will happen in the future. For the Fund's most current performance information, log on to usaa.com or call (800) 531-USAA (8722) or (210) 531-8722.

Performance Information Illustrates Variability of Returns [Text]

rr_PerformanceInformationIllustratesVariabilityOfReturns

The R6 Shares commenced operations on March 1, 2017, and will not present performance information until the share class has one full calendar year of operation. The bar chart provides some indication of the risks of investing in the Fund and illustrates the Fund Shares class's volatility and performance from year to year for each full calendar year over the past 10 years. The table shows how the Fund Shares' average annual total returns for the periods indicated compared to those of the Fund's benchmark index.

Performance One Year or Less [Text]

rr_PerformanceOneYearOrLess

The R6 Shares commenced operations on March 1, 2017, and will not present performance information until the share class has one full calendar year of operation.

Performance Availability Phone [Text]

rr_PerformanceAvailabilityPhone

(800) 531-USAA (8722) or (210) 531-8722

Performance Availability Website Address [Text]

rr_PerformanceAvailabilityWebSiteAddress

usaa.com

Performance Past Does Not Indicate Future [Text]

rr_PerformancePastDoesNotIndicateFuture

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

During the periods shown in the chart:	Returns	Quarter ended
Highest Quarter Return	20.95%	March 31, 2012
Lowest Quarter Return	-23.98%	December 31, 2008
Year-to-Date-Return	3.02%	March 31, 2018

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. In certain situations, the return after taxes on distributions and sale of fund shares may be higher than the other return amounts. A higher after-tax return may result when a capital loss occurs upon redemption and translates into an assumed tax deduction that benefits the shareholder. The actual after-tax returns depend on your tax situation and may differ from those shown. If you hold your shares through a tax-deferred arrangement, such as an individual retirement account (IRA) or 401(k) plan, the after-tax returns shown in the table are not relevant to you.

Performance Table Heading

rr_PerformanceTableHeading

AVERAGE ANNUAL TOTAL RETURNS
For Periods Ended December 31, 2017

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.

Performance Table Not Relevant to Tax Deferred

rr_PerformanceTableNotRelevantToTaxDeferred

If you hold your shares through a tax-deferred arrangement, such as an individual retirement account (IRA) or 401(k) plan, the after-tax returns shown in the table are not relevant to you.

Performance Table Explanation after Tax Higher

rr_PerformanceTableExplanationAfterTaxHigher

In certain situations, the return after taxes on distributions and sale of fund shares may be higher than the other return amounts. A higher after-tax return may result when a capital loss occurs upon redemption and translates into an assumed tax deduction that benefits the shareholder.

Nasdaq-100 Index | Fund Shares

Risk/Return:

rr_RiskReturnAbstract

Shareholder Fee, Other

rr_ShareholderFeeOther

none

Management Fee

rr_ManagementFeesOverAssets

0.20%

Distribution and/or Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

none

Other Expenses

rr_OtherExpensesOverAssets

0.31%

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

0.51%

Reimbursement from Adviser

rr_FeeWaiverOrReimbursementOverAssets

Total Annual Fund Operating Expenses after Reimbursement

rr_NetExpensesOverAssets

0.51%

1 Year

rr_ExpenseExampleYear01

$ 52

3 Years

rr_ExpenseExampleYear03

164

5 Years

rr_ExpenseExampleYear05

285

10 Years

rr_ExpenseExampleYear10

$ 640

2008

rr_AnnualReturn2008

(42.02%)

2009

rr_AnnualReturn2009

53.48%

2010

rr_AnnualReturn2010

19.14%

2011

rr_AnnualReturn2011

2.90%

2012

rr_AnnualReturn2012

17.46%

2013

rr_AnnualReturn2013

36.00%

2014

rr_AnnualReturn2014

18.75%

2015

rr_AnnualReturn2015

9.09%

2016

rr_AnnualReturn2016

6.68%

2017

rr_AnnualReturn2017

32.29%

Year to Date Return, Label

rr_YearToDateReturnLabel

Year-to-Date-Return

Bar Chart, Year to Date Return, Date

rr_BarChartYearToDateReturnDate

Mar. 31, 2018

Bar Chart, Year to Date Return

rr_BarChartYearToDateReturn

3.02%

Highest Quarterly Return, Label

rr_HighestQuarterlyReturnLabel

Highest Quarter Return

Highest Quarterly Return, Date

rr_BarChartHighestQuarterlyReturnDate

Mar. 31, 2012

Highest Quarterly Return

rr_BarChartHighestQuarterlyReturn

20.95%

Lowest Quarterly Return, Label

rr_LowestQuarterlyReturnLabel

Lowest Quarter Return

Lowest Quarterly Return, Date

rr_BarChartLowestQuarterlyReturnDate

Dec. 31, 2008

Lowest Quarterly Return

rr_BarChartLowestQuarterlyReturn

(23.98%)

Past 1 Year

rr_AverageAnnualReturnYear01

32.29%

Past 5 Years

rr_AverageAnnualReturnYear05

19.98%

Past 10 Years

rr_AverageAnnualReturnYear10

12.29%

Nasdaq-100 Index | R6 Shares

Risk/Return:

rr_RiskReturnAbstract

Shareholder Fee, Other

rr_ShareholderFeeOther

none

Management Fee

rr_ManagementFeesOverAssets

0.20%

Distribution and/or Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

none

Other Expenses

rr_OtherExpensesOverAssets

0.81%

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

1.01%

Reimbursement from Adviser

rr_FeeWaiverOrReimbursementOverAssets

(0.61%)

^[1]

Total Annual Fund Operating Expenses after Reimbursement

rr_NetExpensesOverAssets

0.40%

1 Year

rr_ExpenseExampleYear01

$ 41

3 Years

rr_ExpenseExampleYear03

261

5 Years

rr_ExpenseExampleYear05

498

10 Years

rr_ExpenseExampleYear10

$ 1,181

Nasdaq-100 Index | Return After Taxes on Distributions | Fund Shares

Risk/Return:

rr_RiskReturnAbstract

Past 1 Year

rr_AverageAnnualReturnYear01

31.68%

Past 5 Years

rr_AverageAnnualReturnYear05

19.66%

Past 10 Years

rr_AverageAnnualReturnYear10

12.00%

Nasdaq-100 Index | Return After Taxes on Distributions and Sale of Fund Shares | Fund Shares

Risk/Return:

rr_RiskReturnAbstract

Past 1 Year

rr_AverageAnnualReturnYear01

18.78%

Past 5 Years

rr_AverageAnnualReturnYear05

16.30%

Past 10 Years

rr_AverageAnnualReturnYear10

10.23%

Nasdaq-100 Index | Nasdaq-100 Index (reflects no deduction for fees, expenses, or taxes)

Risk/Return:

rr_RiskReturnAbstract

Past 1 Year

rr_AverageAnnualReturnYear01

32.99%

Past 5 Years

rr_AverageAnnualReturnYear05

20.68%

Past 10 Years

rr_AverageAnnualReturnYear10

13.05%

[1] The Investment Adviser has agreed, through April 30, 2019, to make payments or waive management, administration, and other fees to limit the expenses of the R6 Shares of the Fund so that the Total Annual Fund Operating Expenses (exclusive of commission recapture, expense offset arrangements, acquired fund fees and expenses, and extraordinary expenses) do not exceed an annual rate of 0.40% of the R6 Shares' average daily net assets. This reimbursement arrangement may not be changed or terminated during this time period without approval of the Fund's Board of Trustees and may be changed or terminated by the Investment Adviser at any time after April 30, 2019.

XML

Total Return Strategy Fund

USAA Total Return Strategy Fund Summary

Investment Objective

The USAA Total Return Strategy Fund (the Fund) seeks capital appreciation through the use of a dynamic allocation strategy, across stocks, bonds, and cash instruments.

Fees and Expenses

The tables below describe the fees and expenses that you may pay, directly and indirectly, to invest in the Fund. The annual fund operating expenses for the Fund Shares and Institutional Shares are based on expenses incurred during the Fund's most recently completed fiscal year.

Shareholder Fees

(fees paid directly from your investment)

Shareholder Fees - Total Return Strategy Fund - USD ($)	Fund Shares	Inst. Shares
Shareholder Fee, Other	none	none

Annual Fund Operating Expenses

(expenses that you pay each year as a percentage of the value of your investment)

Annual Fund Operating Expenses - Total Return Strategy Fund		Fund Shares	Inst. Shares
Management Fee (fluctuates based on the Fund's performance relative to a securities market index)		0.58%	0.47%
Distribution and/or Service (12b-1) Fees		none	none
Other Expenses		0.87%	0.58%
Acquired Fund Fees and Expenses		0.26%	0.26%
Total Annual Fund Operating Expenses	[1]	1.71%	1.31%

Example

This example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. Although your actual costs may be higher or lower, you would pay the following expenses on a $10,000 investment, assuming (1) a 5% annual return, (2) the Fund's operating expenses remain the same, and (3) you redeem all of your shares at the end of the periods shown.

Expense Example - Total Return Strategy Fund - USD ($)	1 Year	3 Years	5 Years	10 Years
Fund Shares	174	539	928	2,019
Inst. Shares	133	415	718	1,579

Portfolio Turnover

The Fund pays transaction costs, including 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 shares of the Fund are held in a taxable account. These costs, which are not reflected in the Annual Fund Operating Expenses or in the Example, affect the Fund's performance.

For the most recent fiscal year, the Fund's portfolio turnover rate was 15% of the average value of its whole portfolio.

Principal Investment Strategy

In seeking to achieve its objective, the Fund's assets are invested pursuant to a dynamic asset allocation strategy that shifts assets among equity securities, investment-grade bonds, and/or cash equivalents. The dynamic asset allocation strategy seeks to identify the most attractive asset classes based on a multi-faceted approach using both a valuation and fundamental framework. The Fund generally will invest in U.S. and foreign stocks and investment-grade bonds, directly or through exchange-traded funds (ETFs), and/or cash equivalents through investment in short-term, high-quality money market instruments or money market funds. Equity securities in which the Fund may invest include common stocks, securities convertible into common stocks, securities that carry the right to buy common stocks, preferred securities, and ETFs. The bond and money market securities in which the Fund may invest include obligations of U.S., state, and local governments, their agencies and instrumentalities; mortgage- and asset-backed securities; corporate debt securities; repurchase agreements; and other securities believed to have debt-like characteristics, including preferred and synthetic securities.

In addition, in an attempt to reduce the Fund's volatility over time, the Fund may employ an options-based risk-management strategy by purchasing and/or selling options on component indexes or corresponding ETFs and individual equities to attempt to provide the Fund with fairly consistent returns over a wide range of equity market environments.

Principal Risks

Any investment involves risk, and there is no assurance that the Fund's objective will be achieved. The Fund is actively managed and the investment techniques and risk analyses used by the Fund's manager(s) may not produce the desired results. As you consider an investment in the Fund, you also should take into account your tolerance for the daily fluctuations of the financial markets and whether you can afford to leave your money in the Fund for long periods of time to ride out down periods. As with other mutual funds, losing money is a risk of investing in the Fund.

The equity securities in the Fund's portfolio are subject to stock market risk. A company's stock price in general may decline over short or even extended periods, regardless of the success or failure of the company's operations. Stock markets tend to run in cycles, with periods when stock prices generally go up and periods when stock prices generally go down. Equity securities tend to be more volatile than debt securities. In addition, to the degree the Fund invests in foreign securities, there is a possibility that the value of the Fund's investments in foreign securities will decrease because of unique risks, such as currency exchange-rate fluctuations; foreign market illiquidity; emerging-market risk; increased price volatility; uncertain political conditions; exchange-control regulations; foreign ownership limits; different accounting, reporting, and disclosure requirements; difficulties in obtaining legal judgments; and foreign withholding taxes. These risks may be heightened to the extent the Fund invests in emerging-market countries. Emerging-market countries are less economically diverse and less mature than more developed countries and tend to be less politically stable.

The fixed-income securities 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. Fixed-income securities rated below investment grade, also known as "junk" or high-yield bonds, generally entail greater economic, credit, and liquidity risk than investment-grade securities. Their prices may be more volatile, especially during economic downturns, financial setbacks, or liquidity events.

The Fund is subject to the risk that the market value of the bonds in its portfolio will fluctuate because of changes in interest rates, changes in the supply of and demand for debt securities, and other market factors. Bond prices generally are linked to the prevailing market interest rates. In general, when interest rates rise, bond prices fall; and conversely, when interest rates fall, bond prices rise. The price volatility of a bond also depends on its maturity. Generally, the longer the maturity of a bond, the greater is its sensitivity to interest rates. To compensate investors for this higher interest rate risk, bonds with longer maturities generally offer higher yields than bonds with shorter maturities. The Fund may be subject to a greater risk of rising interest rates due to the current period of historically low rates.

ETFs, which generally are registered investment companies, incur their own management and other fees and expenses, such as trustees' fees, operating expenses, registration fees, and marketing expenses, a proportionate share of which will be borne indirectly by the Fund as a shareholder in an ETF. As a result, the Fund's investment in an ETF will cause the Fund to indirectly bear the fees and expenses of the ETF and, in turn, the Fund's performance may be lower than if the Fund were to invest directly in the underlying securities held by the ETF. For investments in affiliated USAA ETFs, the Fund's management fee is reimbursed by the Adviser to the extent of the indirect management fee incurred through the Fund's investment in the affiliated ETFs. The Adviser is subject to potential conflicts of interest in allocating assets among affiliated and unaffiliated ETFs because the Adviser also is responsible for managing and administering the affiliated ETFs, and the Adviser and its affiliates receive other fees from the affiliated ETFs. In addition, the Fund also will be subject to the risks associated with the securities or other investments held by the ETFs.

The Fund may invest in futures, options, and other types of derivatives. Risks associated with derivatives include the risk that the derivative is not well-correlated with the security, index, ETF, or currency to which it relates; the risk that the use of derivatives may not have the intended effects and may result in losses, underperformance, or missed opportunities; the risk that the Fund will be unable to sell the derivative because of an illiquid secondary market; the risk that a counterparty is unwilling or unable to meet its obligation; the risk of interest rate movements; and the risk that the derivatives transaction could expose the Fund to the effects of leverage, which could increase the Fund's market exposure, magnify investment risks and losses, and cause losses to be realized more quickly. There is no guarantee that derivative techniques will be employed or that they will work as intended, and their use could lower returns or even result in losses to the Fund.

The Fund could experience a loss in the options portion of the portfolio, particularly during periods when market values are increasing but market volatility is high. When it sells index or corresponding ETF call options, the Fund receives cash but limits its opportunity to profit from an increase in the market value of its stock portfolio. When the Fund purchases index or corresponding ETF put options, it risks the loss of the cash paid for the options. At times, the Fund may not own put options, which increases exposure to a market decline. When the Fund simultaneously buys index put options and sells index put options to fund the purchases, resulting in an index put spread, the Fund has increased exposure to further market decline if the market price of the index falls below the strike price of the short index put option.

While the Fund does not concentrate in any industry, to the extent that the Fund has exposure to a given industry or sector, any factors affecting that industry or sector could affect the value of portfolio securities. This risk is increased to the extent that the Fund has overweight investments in a particular industry or sector.

The risk of investing in securities that generally are less liquid than higher-quality securities is referred to as liquidity risk. The market for lower-quality issues generally is less liquid than the market for higher-quality issues. Therefore, large purchases or sales could cause sudden and significant price changes in these securities. Many lower-quality issues do not trade frequently; however, when they do trade, the trade price may be substantially higher or lower than expected.

To implement the Fund's principal investment strategies and to take advantage of opportunities and to manage risk, the Fund's securities may be actively and frequently traded. In purchasing and selling securities in order to reallocate its portfolio, the Fund will pay more in brokerage commissions than it would if it did not reallocate assets among asset classes from time to time. While we will attempt to minimize any adverse impact to the Fund or its shareholders, the Fund may have a higher proportion of net realized capital gains which would be taxable to shareholders when distributed to them and a potentially lower return than a fund that does not reallocate from time to time.

An investment in the Fund is not a deposit in USAA Federal Savings Bank, or any other bank, and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.

Performance

The following bar chart and table are intended to help you understand the risks of investing in the Fund. The Fund has two classes of shares: Fund Shares and Institutional Shares. The bar chart provides some indication of the risks of investing in the Fund and illustrates the Fund Shares class's volatility and performance from year to year for each full calendar year over the past 10 years. The table shows how the average annual total returns of the share classes for the periods indicated compared to those of the Fund's benchmark index and an additional broad-based securities market index with investment characteristics similar to the Fund. Performance reflects any expense limitations in effect during the periods shown.

Remember, historical performance (before and after taxes) does not necessarily indicate what will happen in the future. For the Fund's most current performance information, log on to usaa.com or call (800) 531-USAA (8722) or (210) 531-8722.

RISK/RETURN BAR CHART
Annual Returns for Periods Ended December 31

During the periods shown in the chart:	Returns	Quarter ended
Highest Quarter Return	8.82%	June 30, 2009
Lowest Quarter Return	-14.54%	December 31, 2008
Year-to-Date Return	-1.87%	March 31, 2018

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. In certain situations, the return after taxes on distributions and sale of fund shares may be higher than the other return amounts. A higher after-tax return may result when a capital loss occurs upon redemption and translates into an assumed tax deduction that benefits the shareholder. The actual after-tax returns depend on your tax situation and may differ from those shown. If you hold your shares through a tax-deferred arrangement, such as an individual retirement account (IRA) or 401(k) plan, the after-tax returns shown in the table are not relevant to you. Please note that after-tax returns are only shown for the Fund Shares and may differ for each share class.

AVERAGE ANNUAL TOTAL RETURNS
For Periods Ended December 31, 2017

Average Annual Total Returns - Total Return Strategy Fund	Past 1 Year	Past 5 Years	Past 10 Years	Since Inception	Inception Date
Fund Shares	6.60%	(0.60%)	(0.11%)
Fund Shares | Return After Taxes on Distributions	6.59%	(0.74%)	(0.28%)
Fund Shares | Return After Taxes on Distributions and Sale of Fund Shares	3.73%	(0.48%)	(0.08%)
Inst. Shares	6.92%			0.29%	Jul. 12, 2013
MSCI All-Country World Index (reflects no deduction for fees, expenses, or taxes)	23.97%	10.82%	4.65%	9.70%	Jul. 12, 2013
Bloomberg Barclays U.S. Universal Index (reflects no deduction for fees, expenses, or taxes)	4.09%	2.50%	4.33%	3.36%	Jul. 12, 2013
Lipper Flexible Portfolio Funds Index (reflects no deduction for taxes)	15.47%	7.77%	5.21%	7.09%	Jul. 12, 2013

[1] The Total Annual Fund Operating Expenses for the Fund Shares and Institutional Shares may not correlate to the ratio of expenses to average daily net assets shown in the financial highlights, which reflect the operating expenses of the Fund Shares and Institutional Shares and do not include Acquired Fund Fees and Expenses.

XML

Label

Element

Value

Risk/Return:

rr_RiskReturnAbstract

Registrant Name

dei_EntityRegistrantName

USAA MUTUAL FUNDS TRUST

Prospectus Date

rr_ProspectusDate

May 01, 2018

Total Return Strategy Fund

Risk/Return:

rr_RiskReturnAbstract

Risk/Return [Heading]

rr_RiskReturnHeading

USAA Total Return Strategy Fund Summary

Objective [Heading]

rr_ObjectiveHeading

Investment Objective

Objective, Primary [Text Block]

rr_ObjectivePrimaryTextBlock

The USAA Total Return Strategy Fund (the Fund) seeks capital appreciation through the use of a dynamic allocation strategy, across stocks, bonds, and cash instruments.

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. The annual fund operating expenses for the Fund Shares and Institutional Shares are based on expenses incurred during the Fund's most recently completed fiscal year.

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, including 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 shares of the Fund are held in a taxable account. These costs, which are not reflected in the Annual Fund Operating Expenses or in the Example, affect the Fund's performance.

For the most recent fiscal year, the Fund's portfolio turnover rate was 15% of the average value of its whole portfolio.

Portfolio Turnover, Rate

rr_PortfolioTurnoverRate

15.00%

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. Although your actual costs may be higher or lower, you would pay the following expenses on a $10,000 investment, assuming (1) a 5% annual return, (2) the Fund's operating expenses remain the same, and (3) you redeem all of your shares at the end of the periods shown.

Strategy [Heading]

rr_StrategyHeading

Principal Investment Strategy

Strategy Narrative [Text Block]

rr_StrategyNarrativeTextBlock

In seeking to achieve its objective, the Fund's assets are invested pursuant to a dynamic asset allocation strategy that shifts assets among equity securities, investment-grade bonds, and/or cash equivalents. The dynamic asset allocation strategy seeks to identify the most attractive asset classes based on a multi-faceted approach using both a valuation and fundamental framework. The Fund generally will invest in U.S. and foreign stocks and investment-grade bonds, directly or through exchange-traded funds (ETFs), and/or cash equivalents through investment in short-term, high-quality money market instruments or money market funds. Equity securities in which the Fund may invest include common stocks, securities convertible into common stocks, securities that carry the right to buy common stocks, preferred securities, and ETFs. The bond and money market securities in which the Fund may invest include obligations of U.S., state, and local governments, their agencies and instrumentalities; mortgage- and asset-backed securities; corporate debt securities; repurchase agreements; and other securities believed to have debt-like characteristics, including preferred and synthetic securities.

In addition, in an attempt to reduce the Fund's volatility over time, the Fund may employ an options-based risk-management strategy by purchasing and/or selling options on component indexes or corresponding ETFs and individual equities to attempt to provide the Fund with fairly consistent returns over a wide range of equity market environments.

Risk [Heading]

rr_RiskHeading

Principal Risks

Risk Narrative [Text Block]

rr_RiskNarrativeTextBlock

Any investment involves risk, and there is no assurance that the Fund's objective will be achieved. The Fund is actively managed and the investment techniques and risk analyses used by the Fund's manager(s) may not produce the desired results. As you consider an investment in the Fund, you also should take into account your tolerance for the daily fluctuations of the financial markets and whether you can afford to leave your money in the Fund for long periods of time to ride out down periods. As with other mutual funds, losing money is a risk of investing in the Fund.

The equity securities in the Fund's portfolio are subject to stock market risk. A company's stock price in general may decline over short or even extended periods, regardless of the success or failure of the company's operations. Stock markets tend to run in cycles, with periods when stock prices generally go up and periods when stock prices generally go down. Equity securities tend to be more volatile than debt securities. In addition, to the degree the Fund invests in foreign securities, there is a possibility that the value of the Fund's investments in foreign securities will decrease because of unique risks, such as currency exchange-rate fluctuations; foreign market illiquidity; emerging-market risk; increased price volatility; uncertain political conditions; exchange-control regulations; foreign ownership limits; different accounting, reporting, and disclosure requirements; difficulties in obtaining legal judgments; and foreign withholding taxes. These risks may be heightened to the extent the Fund invests in emerging-market countries. Emerging-market countries are less economically diverse and less mature than more developed countries and tend to be less politically stable.

The fixed-income securities 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. Fixed-income securities rated below investment grade, also known as "junk" or high-yield bonds, generally entail greater economic, credit, and liquidity risk than investment-grade securities. Their prices may be more volatile, especially during economic downturns, financial setbacks, or liquidity events.

The Fund is subject to the risk that the market value of the bonds in its portfolio will fluctuate because of changes in interest rates, changes in the supply of and demand for debt securities, and other market factors. Bond prices generally are linked to the prevailing market interest rates. In general, when interest rates rise, bond prices fall; and conversely, when interest rates fall, bond prices rise. The price volatility of a bond also depends on its maturity. Generally, the longer the maturity of a bond, the greater is its sensitivity to interest rates. To compensate investors for this higher interest rate risk, bonds with longer maturities generally offer higher yields than bonds with shorter maturities. The Fund may be subject to a greater risk of rising interest rates due to the current period of historically low rates.

ETFs, which generally are registered investment companies, incur their own management and other fees and expenses, such as trustees' fees, operating expenses, registration fees, and marketing expenses, a proportionate share of which will be borne indirectly by the Fund as a shareholder in an ETF. As a result, the Fund's investment in an ETF will cause the Fund to indirectly bear the fees and expenses of the ETF and, in turn, the Fund's performance may be lower than if the Fund were to invest directly in the underlying securities held by the ETF. For investments in affiliated USAA ETFs, the Fund's management fee is reimbursed by the Adviser to the extent of the indirect management fee incurred through the Fund's investment in the affiliated ETFs. The Adviser is subject to potential conflicts of interest in allocating assets among affiliated and unaffiliated ETFs because the Adviser also is responsible for managing and administering the affiliated ETFs, and the Adviser and its affiliates receive other fees from the affiliated ETFs. In addition, the Fund also will be subject to the risks associated with the securities or other investments held by the ETFs.

The Fund may invest in futures, options, and other types of derivatives. Risks associated with derivatives include the risk that the derivative is not well-correlated with the security, index, ETF, or currency to which it relates; the risk that the use of derivatives may not have the intended effects and may result in losses, underperformance, or missed opportunities; the risk that the Fund will be unable to sell the derivative because of an illiquid secondary market; the risk that a counterparty is unwilling or unable to meet its obligation; the risk of interest rate movements; and the risk that the derivatives transaction could expose the Fund to the effects of leverage, which could increase the Fund's market exposure, magnify investment risks and losses, and cause losses to be realized more quickly. There is no guarantee that derivative techniques will be employed or that they will work as intended, and their use could lower returns or even result in losses to the Fund.

The Fund could experience a loss in the options portion of the portfolio, particularly during periods when market values are increasing but market volatility is high. When it sells index or corresponding ETF call options, the Fund receives cash but limits its opportunity to profit from an increase in the market value of its stock portfolio. When the Fund purchases index or corresponding ETF put options, it risks the loss of the cash paid for the options. At times, the Fund may not own put options, which increases exposure to a market decline. When the Fund simultaneously buys index put options and sells index put options to fund the purchases, resulting in an index put spread, the Fund has increased exposure to further market decline if the market price of the index falls below the strike price of the short index put option.

While the Fund does not concentrate in any industry, to the extent that the Fund has exposure to a given industry or sector, any factors affecting that industry or sector could affect the value of portfolio securities. This risk is increased to the extent that the Fund has overweight investments in a particular industry or sector.

The risk of investing in securities that generally are less liquid than higher-quality securities is referred to as liquidity risk. The market for lower-quality issues generally is less liquid than the market for higher-quality issues. Therefore, large purchases or sales could cause sudden and significant price changes in these securities. Many lower-quality issues do not trade frequently; however, when they do trade, the trade price may be substantially higher or lower than expected.

To implement the Fund's principal investment strategies and to take advantage of opportunities and to manage risk, the Fund's securities may be actively and frequently traded. In purchasing and selling securities in order to reallocate its portfolio, the Fund will pay more in brokerage commissions than it would if it did not reallocate assets among asset classes from time to time. While we will attempt to minimize any adverse impact to the Fund or its shareholders, the Fund may have a higher proportion of net realized capital gains which would be taxable to shareholders when distributed to them and a potentially lower return than a fund that does not reallocate from time to time.

An investment in the Fund is not a deposit in USAA Federal Savings Bank, or any other bank, and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.

Risk Lose Money [Text]

rr_RiskLoseMoney

As with other mutual funds, losing money is a risk of investing in the Fund.

Risk Not Insured Depository Institution [Text]

rr_RiskNotInsuredDepositoryInstitution

An investment in the Fund is not a deposit in USAA Federal Savings Bank, or any other bank, and is not insured or guaranteed by the Federal Deposit Insurance Corporation 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 Fund has two classes of shares: Fund Shares and Institutional Shares. The bar chart provides some indication of the risks of investing in the Fund and illustrates the Fund Shares class's volatility and performance from year to year for each full calendar year over the past 10 years. The table shows how the average annual total returns of the share classes for the periods indicated compared to those of the Fund's benchmark index and an additional broad-based securities market index with investment characteristics similar to the Fund. Performance reflects any expense limitations in effect during the periods shown.

Remember, historical performance (before and after taxes) does not necessarily indicate what will happen in the future. For the Fund's most current performance information, log on to usaa.com or call (800) 531-USAA (8722) or (210) 531-8722.

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 Shares class's volatility and performance from year to year for each full calendar year over the past 10 years. The table shows how the average annual total returns of the share classes for the periods indicated compared to those of the Fund's benchmark index and an additional broad-based securities market index with investment characteristics similar to the Fund.

Performance Availability Phone [Text]

rr_PerformanceAvailabilityPhone

(800) 531-USAA (8722) or (210) 531-8722

Performance Availability Website Address [Text]

rr_PerformanceAvailabilityWebSiteAddress

usaa.com

Performance Past Does Not Indicate Future [Text]

rr_PerformancePastDoesNotIndicateFuture

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

During the periods shown in the chart:	Returns	Quarter ended
Highest Quarter Return	8.82%	June 30, 2009
Lowest Quarter Return	-14.54%	December 31, 2008
Year-to-Date Return	-1.87%	March 31, 2018

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. In certain situations, the return after taxes on distributions and sale of fund shares may be higher than the other return amounts. A higher after-tax return may result when a capital loss occurs upon redemption and translates into an assumed tax deduction that benefits the shareholder. The actual after-tax returns depend on your tax situation and may differ from those shown. If you hold your shares through a tax-deferred arrangement, such as an individual retirement account (IRA) or 401(k) plan, the after-tax returns shown in the table are not relevant to you. Please note that after-tax returns are only shown for the Fund Shares and may differ for each share class.

Performance Table Heading

rr_PerformanceTableHeading

AVERAGE ANNUAL TOTAL RETURNS
For Periods Ended December 31, 2017

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.

Performance Table Not Relevant to Tax Deferred

rr_PerformanceTableNotRelevantToTaxDeferred

If you hold your shares through a tax-deferred arrangement, such as an individual retirement account (IRA) or 401(k) plan, the after-tax returns shown in the table are not relevant to you.

Performance Table One Class of after Tax Shown [Text]

rr_PerformanceTableOneClassOfAfterTaxShown

Please note that after-tax returns are only shown for the Fund Shares and may differ for each share class.

Performance Table Explanation after Tax Higher

rr_PerformanceTableExplanationAfterTaxHigher

In certain situations, the return after taxes on distributions and sale of fund shares may be higher than the other return amounts. A higher after-tax return may result when a capital loss occurs upon redemption and translates into an assumed tax deduction that benefits the shareholder.

Total Return Strategy Fund | Fund Shares

Risk/Return:

rr_RiskReturnAbstract

Shareholder Fee, Other

rr_ShareholderFeeOther

none

Management Fee (fluctuates based on the Fund's performance relative to a securities market index)

rr_ManagementFeesOverAssets

0.58%

Distribution and/or Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

none

Other Expenses

rr_OtherExpensesOverAssets

0.87%

Acquired Fund Fees and Expenses

rr_AcquiredFundFeesAndExpensesOverAssets

0.26%

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

1.71%

^[1]

1 Year

rr_ExpenseExampleYear01

$ 174

3 Years

rr_ExpenseExampleYear03

539

5 Years

rr_ExpenseExampleYear05

928

10 Years

rr_ExpenseExampleYear10

$ 2,019

2008

rr_AnnualReturn2008

(21.01%)

2009

rr_AnnualReturn2009

12.25%

2010

rr_AnnualReturn2010

5.01%

2011

rr_AnnualReturn2011

(1.04%)

2012

rr_AnnualReturn2012

10.62%

2013

rr_AnnualReturn2013

(0.62%)

2014

rr_AnnualReturn2014

2.26%

2015

rr_AnnualReturn2015

(11.69%)

2016

rr_AnnualReturn2016

1.41%

2017

rr_AnnualReturn2017

6.60%

Year to Date Return, Label

rr_YearToDateReturnLabel

Year-to-Date Return

Bar Chart, Year to Date Return, Date

rr_BarChartYearToDateReturnDate

Mar. 31, 2018

Bar Chart, Year to Date Return

rr_BarChartYearToDateReturn

(1.87%)

Highest Quarterly Return, Label

rr_HighestQuarterlyReturnLabel

Highest Quarter Return

Highest Quarterly Return, Date

rr_BarChartHighestQuarterlyReturnDate

Jun. 30, 2009

Highest Quarterly Return

rr_BarChartHighestQuarterlyReturn

8.82%

Lowest Quarterly Return, Label

rr_LowestQuarterlyReturnLabel

Lowest Quarter Return

Lowest Quarterly Return, Date

rr_BarChartLowestQuarterlyReturnDate

Dec. 31, 2008

Lowest Quarterly Return

rr_BarChartLowestQuarterlyReturn

(14.54%)

Past 1 Year

rr_AverageAnnualReturnYear01

6.60%

Past 5 Years

rr_AverageAnnualReturnYear05

(0.60%)

Past 10 Years

rr_AverageAnnualReturnYear10

(0.11%)

Since Inception

rr_AverageAnnualReturnSinceInception

Inception Date

rr_AverageAnnualReturnInceptionDate

Total Return Strategy Fund | Inst. Shares

Risk/Return:

rr_RiskReturnAbstract

Shareholder Fee, Other

rr_ShareholderFeeOther

none

Management Fee (fluctuates based on the Fund's performance relative to a securities market index)

rr_ManagementFeesOverAssets

0.47%

Distribution and/or Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

none

Other Expenses

rr_OtherExpensesOverAssets

0.58%

Acquired Fund Fees and Expenses

rr_AcquiredFundFeesAndExpensesOverAssets

0.26%

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

1.31%

^[1]

1 Year

rr_ExpenseExampleYear01

$ 133

3 Years

rr_ExpenseExampleYear03

415

5 Years

rr_ExpenseExampleYear05

718

10 Years

rr_ExpenseExampleYear10

$ 1,579

Past 1 Year

rr_AverageAnnualReturnYear01

6.92%

Past 5 Years

rr_AverageAnnualReturnYear05

Past 10 Years

rr_AverageAnnualReturnYear10

Since Inception

rr_AverageAnnualReturnSinceInception

0.29%

Inception Date

rr_AverageAnnualReturnInceptionDate

Jul. 12, 2013

Total Return Strategy Fund | Return After Taxes on Distributions | Fund Shares

Risk/Return:

rr_RiskReturnAbstract

Past 1 Year

rr_AverageAnnualReturnYear01

6.59%

Past 5 Years

rr_AverageAnnualReturnYear05

(0.74%)

Past 10 Years

rr_AverageAnnualReturnYear10

(0.28%)

Since Inception

rr_AverageAnnualReturnSinceInception

Total Return Strategy Fund | Return After Taxes on Distributions and Sale of Fund Shares | Fund Shares

Risk/Return:

rr_RiskReturnAbstract

Past 1 Year

rr_AverageAnnualReturnYear01

3.73%

Past 5 Years

rr_AverageAnnualReturnYear05

(0.48%)

Past 10 Years

rr_AverageAnnualReturnYear10

(0.08%)

Since Inception

rr_AverageAnnualReturnSinceInception

Total Return Strategy Fund | MSCI All-Country World Index (reflects no deduction for fees, expenses, or taxes)

Risk/Return:

rr_RiskReturnAbstract

Past 1 Year

rr_AverageAnnualReturnYear01

23.97%

Past 5 Years

rr_AverageAnnualReturnYear05

10.82%

Past 10 Years

rr_AverageAnnualReturnYear10

4.65%

Since Inception

rr_AverageAnnualReturnSinceInception

9.70%

Inception Date

rr_AverageAnnualReturnInceptionDate

Jul. 12, 2013

Total Return Strategy Fund | Bloomberg Barclays U.S. Universal Index (reflects no deduction for fees, expenses, or taxes)

Risk/Return:

rr_RiskReturnAbstract

Past 1 Year

rr_AverageAnnualReturnYear01

4.09%

Past 5 Years

rr_AverageAnnualReturnYear05

2.50%

Past 10 Years

rr_AverageAnnualReturnYear10

4.33%

Since Inception

rr_AverageAnnualReturnSinceInception

3.36%

Inception Date

rr_AverageAnnualReturnInceptionDate

Jul. 12, 2013

Total Return Strategy Fund | Lipper Flexible Portfolio Funds Index (reflects no deduction for taxes)

Risk/Return:

rr_RiskReturnAbstract

Past 1 Year

rr_AverageAnnualReturnYear01

15.47%

Past 5 Years

rr_AverageAnnualReturnYear05

7.77%

Past 10 Years

rr_AverageAnnualReturnYear10

5.21%

Since Inception

rr_AverageAnnualReturnSinceInception

7.09%

Inception Date

rr_AverageAnnualReturnInceptionDate

Jul. 12, 2013

[1] The Total Annual Fund Operating Expenses for the Fund Shares and Institutional Shares may not correlate to the ratio of expenses to average daily net assets shown in the financial highlights, which reflect the operating expenses of the Fund Shares and Institutional Shares and do not include Acquired Fund Fees and Expenses.

XML

Ultra Short-Term Bond Fund

USAA Ultra Short-Term Bond Fund Summary

Investment Objective

The USAA Ultra Short-Term Bond Fund (the Fund) seeks to provide high current income consistent with preservation of principal.

Fees and Expenses

The tables below describe the fees and expenses that you may pay, directly and indirectly, to invest in the Fund. The annual fund operating expenses for the Fund Shares, Institutional Shares, and R6 Shares are based on expenses incurred during the Fund's most recently completed fiscal year.

Shareholder Fees

(fees paid directly from your investment)

Shareholder Fees - Ultra Short-Term Bond Fund - USD ($)	Fund Shares	Inst. Shares	R6 Shares
Shareholder Fee, Other	none	none	none

Annual Fund Operating Expenses

(expenses that you pay each year as a percentage of the value of your investment)

Annual Fund Operating Expenses - Ultra Short-Term Bond Fund	Fund Shares	Inst. Shares		R6 Shares
Management Fee (fluctuates based on the Fund's performance relative to a securities market index)	0.24%	0.24%		0.24%
Distribution and/or Service (12b-1) Fees	none	none		none
Other Expenses	0.34%	0.51%		0.81%
Total Annual Fund Operating Expenses	0.58%	0.75%		1.05%
Reimbursement from Adviser		(0.20%)	[1]	(0.66%)	[1]
Total Annual Fund Operating Expenses after Reimbursement	0.58%	0.55%		0.39%

Example

This example is intended to help you compare the cost of investing in this Fund with the cost of investing in other mutual funds. Although your actual costs may be higher or lower, you would pay the following expenses on a $10,000 investment, assuming (1) a 5% annual return, (2) the Fund's operating expenses remain the same, (3) you redeem all of your shares at the end of the periods shown, and (4) the expense reimbursement arrangement for the Institutional Shares and R6 Shares is not continued beyond one year.

Expense Example - Ultra Short-Term Bond Fund - USD ($)	1 Year	3 Years	5 Years	10 Years
Fund Shares	59	186	324	726
Inst. Shares	56	220	397	912
R6 Shares	40	268	515	1,223

Portfolio Turnover

The Fund pays transaction costs, including 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 shares of the Fund are held in a taxable account. These costs, which are not reflected in the Annual Fund Operating Expenses or in the Example, affect the Fund's performance.

For the most recent fiscal year, the Fund's portfolio turnover rate was 58% of the average value of its whole portfolio.

Principal Investment Strategy

The Fund's principal investment strategy is normally to invest at least 80% of the Fund's assets in investment-grade debt securities that have a dollar-weighted average portfolio maturity of 18 months (one and a half years) or less. The Fund will invest primarily in U.S. dollar-denominated debt securities that may include, but are not limited to, obligations of U.S., state, and local governments, their agencies and instrumentalities; mortgage- and asset-backed securities; corporate debt securities; repurchase agreements; and other securities believed to have debt-like characteristics. This 80% policy may be changed upon at least 60 days' written notice to shareholders.

Principal Risks

Any investment involves risk, and there is no assurance that the Fund's objective will be achieved. The Fund is actively managed and the investment techniques and risk analyses used by the Fund's manager(s) may not produce the desired results. As you consider an investment in the Fund, you also should take into account your tolerance for the daily fluctuations of the financial markets and whether you can afford to leave your money in the Fund for long periods of time to ride out down periods. As with other mutual funds, losing money is a risk of investing in the Fund.

The fixed-income securities 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. Fixed-income securities rated below investment grade, also known as "junk" or high-yield bonds, generally entail greater economic, credit, and liquidity risk than investment-grade securities. Their prices may be more volatile, especially during economic downturns, financial setbacks, or liquidity events.

The Fund is subject to the risk that the market value of the bonds in its portfolio will fluctuate because of changes in interest rates, changes in the supply of and demand for debt securities, and other market factors. Bond prices generally are linked to the prevailing market interest rates. In general, when interest rates rise, bond prices fall; and conversely, when interest rates fall, bond prices rise. The price volatility of a bond also depends on its maturity. Generally, the longer the maturity of a bond, the greater is its sensitivity to interest rates. To compensate investors for this higher interest rate risk, bonds with longer maturities generally offer higher yields than bonds with shorter maturities. The Fund may be subject to a greater risk of rising interest rates due to the current period of historically low rates. The ability of an issuer of a debt security to repay principal prior to a security's maturity can cause greater price volatility if interest rates change.

The Fund is subject to legislative risk, which is the risk that changes in government policies may affect the value of the investments held by the Fund in ways we cannot anticipate, and that such policies could have an adverse impact on the value of the Fund's investments and the Fund's net asset value (NAV).

The risk of investing in securities that generally are less liquid than higher-quality securities is referred to as liquidity risk. The market for lower-quality issues generally is less liquid than the market for higher-quality issues. Therefore, large purchases or sales could cause sudden and significant price changes in these securities. Many lower-quality issues do not trade frequently; however, when they do trade, the trade price may be substantially higher or lower than expected.

The Fund is subject to prepayment and extension risk. The Fund can invest in mortgage-backed securities. These securities make regularly scheduled payments of principal along with interest payments. In addition, mortgagors generally have the option of paying off their mortgages without penalty at any time. For example, when a mortgaged property is sold, the old mortgage is usually prepaid. Also, when interest rates fall, the mortgagor may refinance the mortgage and prepay the old mortgage. A homeowner's default on the mortgage also may cause a prepayment of the mortgage. This unpredictability of the mortgage's cash flow is called prepayment risk. For the investor, prepayment risk usually means that principal is received at the least opportune time. For example, when interest rates fall, homeowners may find it advantageous to refinance their mortgages and prepay principal. In this case, the investor is forced to reinvest the principal at the current lower rate. On the other hand, when interest rates rise, homeowners generally will not refinance their mortgages and prepayments will fall. This causes the average life of the mortgage to extend and be more sensitive to interest rates, which sometimes is called extension risk. In addition, the amount of principal the investor has to invest in these higher interest rates is reduced.

An investment in the Fund is not a deposit in USAA Federal Savings Bank, or any other bank, and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.

Performance

The following bar chart and table are intended to help you understand the risks of investing in the Fund. The Fund has three classes of shares: Fund Shares, Institutional Shares, and R6 Shares. The R6 Shares commenced operations on March 1, 2017, and will not present performance information until the share class has one full calendar year of operation. The bar chart provides some indication of the risks of investing in the Fund and illustrates the Fund Shares class's volatility and performance from year to year for each full calendar year since the Fund's inception. The table shows how the average annual total returns of the share classes for the periods indicated compared to those of the Fund's benchmark index and an additional index of funds with similar investment objectives. Performance reflects any expense limitations in effect during the periods shown.

Remember, historical performance (before and after taxes) does not necessarily indicate what will happen in the future. For the Fund's most current performance information, log on to usaa.com or call (800) 531-USAA (8722) or (210) 531-8722.

RISK/RETURN BAR CHART
Annual Returns for Periods Ended December 31

During the periods shown in the chart:	Returns	Quarter ended
Highest Quarter Return	1.01%	March 31, 2012
Lowest Quarter Return	-0.38%	September 30, 2015
Year-to-Date Return	-0.02%	March 31, 2018

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. In certain situations, the return after taxes on distributions and sale of fund shares may be higher than the other return amounts. A higher after-tax return may result when a capital loss occurs upon redemption and translates into an assumed tax deduction that benefits the shareholder. The actual after-tax returns depend on your tax situation and may differ from those shown. If you hold your shares through a tax-deferred arrangement, such as an individual retirement account (IRA) or 401(k) plan, the after-tax returns shown in the table are not relevant to you. Please note that after-tax returns are only shown for the Fund Shares and may differ for each share class.

AVERAGE ANNUAL TOTAL RETURNS
For Periods Ended December 31, 2017

Average Annual Total Returns - Ultra Short-Term Bond Fund	Past 1 Year	Past 5 Years	Since Inception	Inception Date
Fund Shares	1.51%	1.10%	1.41%	Oct. 18, 2010
Fund Shares | Return After Taxes on Distributions	0.81%	0.50%	0.82%
Fund Shares | Return After Taxes on Distributions and Sale of Fund Shares	0.85%	0.57%	0.83%
Inst. Shares	1.44%		1.14%	Jul. 12, 2013
Citigroup 3-Month U.S. Treasury Bill Index (reflects no deduction for fees, expenses, or taxes)	0.84%	0.24%	0.19%	Oct. 18, 2010	[1]
Lipper Ultra Short Obligations Funds Index (reflects no deduction for taxes)	1.33%	0.83%	0.89%	Oct. 18, 2010	[1]

[1] The Investment Adviser has agreed, through April 30, 2019, to make payments or waive management, administration, and other fees to limit the expenses of the Institutional Shares and the R6 Shares of the Fund so that the Total Annual Fund Operating Expenses (exclusive of commission recapture, expense offset arrangements, acquired fund fees and expenses, and extraordinary expenses) do not exceed an annual rate of 0.55% and 0.39% of the Institutional Shares' and the R6 Shares' average daily net assets, respectively. This reimbursement arrangement may not be changed or terminated during this time period without approval of the Fund's Board of Trustees and may be changed or terminated by the Investment Adviser any time after April 30, 2019.

[1] The average annual total return for the Citigroup 3-Month U.S. Treasury Bill Index and Lipper Ultra Short Obligations Funds Index from July 12, 2013, the inception date of the Institutional Shares, through December 31, 2017, was 0.27% and 0.91%, respectively.

XML

Label

Element

Value

Risk/Return:

rr_RiskReturnAbstract

Registrant Name

dei_EntityRegistrantName

USAA MUTUAL FUNDS TRUST

Prospectus Date

rr_ProspectusDate

May 01, 2018

Ultra Short-Term Bond Fund

Risk/Return:

rr_RiskReturnAbstract

Risk/Return [Heading]

rr_RiskReturnHeading

USAA Ultra Short-Term Bond Fund Summary

Objective [Heading]

rr_ObjectiveHeading

Investment Objective

Objective, Primary [Text Block]

rr_ObjectivePrimaryTextBlock

The USAA Ultra Short-Term Bond Fund (the Fund) seeks to provide high current income consistent with preservation of principal.

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. The annual fund operating expenses for the Fund Shares, Institutional Shares, and R6 Shares are based on expenses incurred during the Fund's most recently completed fiscal year.

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)

Fee Waiver or Reimbursement over Assets, Date of Termination

rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination

April 30, 2019

Portfolio Turnover [Heading]

rr_PortfolioTurnoverHeading

Portfolio Turnover

Portfolio Turnover [Text Block]

rr_PortfolioTurnoverTextBlock

The Fund pays transaction costs, including 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 shares of the Fund are held in a taxable account. These costs, which are not reflected in the Annual Fund Operating Expenses or in the Example, affect the Fund's performance.

For the most recent fiscal year, the Fund's portfolio turnover rate was 58% of the average value of its whole portfolio.

Portfolio Turnover, Rate

rr_PortfolioTurnoverRate

58.00%

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 this Fund with the cost of investing in other mutual funds. Although your actual costs may be higher or lower, you would pay the following expenses on a $10,000 investment, assuming (1) a 5% annual return, (2) the Fund's operating expenses remain the same, (3) you redeem all of your shares at the end of the periods shown, and (4) the expense reimbursement arrangement for the Institutional Shares and R6 Shares is not continued beyond one year.

Strategy [Heading]

rr_StrategyHeading

Principal Investment Strategy

Strategy Narrative [Text Block]

rr_StrategyNarrativeTextBlock

The Fund's principal investment strategy is normally to invest at least 80% of the Fund's assets in investment-grade debt securities that have a dollar-weighted average portfolio maturity of 18 months (one and a half years) or less. The Fund will invest primarily in U.S. dollar-denominated debt securities that may include, but are not limited to, obligations of U.S., state, and local governments, their agencies and instrumentalities; mortgage- and asset-backed securities; corporate debt securities; repurchase agreements; and other securities believed to have debt-like characteristics. This 80% policy may be changed upon at least 60 days' written notice to shareholders.

Risk [Heading]

rr_RiskHeading

Principal Risks

Risk Narrative [Text Block]

rr_RiskNarrativeTextBlock

Any investment involves risk, and there is no assurance that the Fund's objective will be achieved. The Fund is actively managed and the investment techniques and risk analyses used by the Fund's manager(s) may not produce the desired results. As you consider an investment in the Fund, you also should take into account your tolerance for the daily fluctuations of the financial markets and whether you can afford to leave your money in the Fund for long periods of time to ride out down periods. As with other mutual funds, losing money is a risk of investing in the Fund.

The fixed-income securities 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. Fixed-income securities rated below investment grade, also known as "junk" or high-yield bonds, generally entail greater economic, credit, and liquidity risk than investment-grade securities. Their prices may be more volatile, especially during economic downturns, financial setbacks, or liquidity events.

The Fund is subject to the risk that the market value of the bonds in its portfolio will fluctuate because of changes in interest rates, changes in the supply of and demand for debt securities, and other market factors. Bond prices generally are linked to the prevailing market interest rates. In general, when interest rates rise, bond prices fall; and conversely, when interest rates fall, bond prices rise. The price volatility of a bond also depends on its maturity. Generally, the longer the maturity of a bond, the greater is its sensitivity to interest rates. To compensate investors for this higher interest rate risk, bonds with longer maturities generally offer higher yields than bonds with shorter maturities. The Fund may be subject to a greater risk of rising interest rates due to the current period of historically low rates. The ability of an issuer of a debt security to repay principal prior to a security's maturity can cause greater price volatility if interest rates change.

The Fund is subject to legislative risk, which is the risk that changes in government policies may affect the value of the investments held by the Fund in ways we cannot anticipate, and that such policies could have an adverse impact on the value of the Fund's investments and the Fund's net asset value (NAV).

The risk of investing in securities that generally are less liquid than higher-quality securities is referred to as liquidity risk. The market for lower-quality issues generally is less liquid than the market for higher-quality issues. Therefore, large purchases or sales could cause sudden and significant price changes in these securities. Many lower-quality issues do not trade frequently; however, when they do trade, the trade price may be substantially higher or lower than expected.

The Fund is subject to prepayment and extension risk. The Fund can invest in mortgage-backed securities. These securities make regularly scheduled payments of principal along with interest payments. In addition, mortgagors generally have the option of paying off their mortgages without penalty at any time. For example, when a mortgaged property is sold, the old mortgage is usually prepaid. Also, when interest rates fall, the mortgagor may refinance the mortgage and prepay the old mortgage. A homeowner's default on the mortgage also may cause a prepayment of the mortgage. This unpredictability of the mortgage's cash flow is called prepayment risk. For the investor, prepayment risk usually means that principal is received at the least opportune time. For example, when interest rates fall, homeowners may find it advantageous to refinance their mortgages and prepay principal. In this case, the investor is forced to reinvest the principal at the current lower rate. On the other hand, when interest rates rise, homeowners generally will not refinance their mortgages and prepayments will fall. This causes the average life of the mortgage to extend and be more sensitive to interest rates, which sometimes is called extension risk. In addition, the amount of principal the investor has to invest in these higher interest rates is reduced.

An investment in the Fund is not a deposit in USAA Federal Savings Bank, or any other bank, and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.

Risk Lose Money [Text]

rr_RiskLoseMoney

As with other mutual funds, losing money is a risk of investing in the Fund.

Risk Not Insured Depository Institution [Text]

rr_RiskNotInsuredDepositoryInstitution

An investment in the Fund is not a deposit in USAA Federal Savings Bank, or any other bank, and is not insured or guaranteed by the Federal Deposit Insurance Corporation 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 Fund has three classes of shares: Fund Shares, Institutional Shares, and R6 Shares. The R6 Shares commenced operations on March 1, 2017, and will not present performance information until the share class has one full calendar year of operation. The bar chart provides some indication of the risks of investing in the Fund and illustrates the Fund Shares class's volatility and performance from year to year for each full calendar year since the Fund's inception. The table shows how the average annual total returns of the share classes for the periods indicated compared to those of the Fund's benchmark index and an additional index of funds with similar investment objectives. Performance reflects any expense limitations in effect during the periods shown.

Remember, historical performance (before and after taxes) does not necessarily indicate what will happen in the future. For the Fund's most current performance information, log on to usaa.com or call (800) 531-USAA (8722) or (210) 531-8722.

Performance Information Illustrates Variability of Returns [Text]

rr_PerformanceInformationIllustratesVariabilityOfReturns

The R6 Shares commenced operations on March 1, 2017, and will not present performance information until the share class has one full calendar year of operation. The bar chart provides some indication of the risks of investing in the Fund and illustrates the Fund Shares class's volatility and performance from year to year for each full calendar year since the Fund's inception. The table shows how the average annual total returns of the share classes for the periods indicated compared to those of the Fund's benchmark index and an additional index of funds with similar investment objectives.

Performance One Year or Less [Text]

rr_PerformanceOneYearOrLess

The R6 Shares commenced operations on March 1, 2017, and will not present performance information until the share class has one full calendar year of operation.

Performance Availability Phone [Text]

rr_PerformanceAvailabilityPhone

(800) 531-USAA (8722) or (210) 531-8722

Performance Availability Website Address [Text]

rr_PerformanceAvailabilityWebSiteAddress

usaa.com

Performance Past Does Not Indicate Future [Text]

rr_PerformancePastDoesNotIndicateFuture

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

During the periods shown in the chart:	Returns	Quarter ended
Highest Quarter Return	1.01%	March 31, 2012
Lowest Quarter Return	-0.38%	September 30, 2015
Year-to-Date Return	-0.02%	March 31, 2018

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. In certain situations, the return after taxes on distributions and sale of fund shares may be higher than the other return amounts. A higher after-tax return may result when a capital loss occurs upon redemption and translates into an assumed tax deduction that benefits the shareholder. The actual after-tax returns depend on your tax situation and may differ from those shown. If you hold your shares through a tax-deferred arrangement, such as an individual retirement account (IRA) or 401(k) plan, the after-tax returns shown in the table are not relevant to you. Please note that after-tax returns are only shown for the Fund Shares and may differ for each share class.

Performance Table Heading

rr_PerformanceTableHeading

AVERAGE ANNUAL TOTAL RETURNS
For Periods Ended December 31, 2017

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.

Performance Table Not Relevant to Tax Deferred

rr_PerformanceTableNotRelevantToTaxDeferred

If you hold your shares through a tax-deferred arrangement, such as an individual retirement account (IRA) or 401(k) plan, the after-tax returns shown in the table are not relevant to you.

Performance Table One Class of after Tax Shown [Text]

rr_PerformanceTableOneClassOfAfterTaxShown

Please note that after-tax returns are only shown for the Fund Shares and may differ for each share class.

Performance Table Explanation after Tax Higher

rr_PerformanceTableExplanationAfterTaxHigher

In certain situations, the return after taxes on distributions and sale of fund shares may be higher than the other return amounts. A higher after-tax return may result when a capital loss occurs upon redemption and translates into an assumed tax deduction that benefits the shareholder.

Ultra Short-Term Bond Fund | Fund Shares

Risk/Return:

rr_RiskReturnAbstract

Shareholder Fee, Other

rr_ShareholderFeeOther

none

Management Fee (fluctuates based on the Fund's performance relative to a securities market index)

rr_ManagementFeesOverAssets

0.24%

Distribution and/or Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

none

Other Expenses

rr_OtherExpensesOverAssets

0.34%

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

0.58%

Reimbursement from Adviser

rr_FeeWaiverOrReimbursementOverAssets

Total Annual Fund Operating Expenses after Reimbursement

rr_NetExpensesOverAssets

0.58%

1 Year

rr_ExpenseExampleYear01

$ 59

3 Years

rr_ExpenseExampleYear03

186

5 Years

rr_ExpenseExampleYear05

324

10 Years

rr_ExpenseExampleYear10

$ 726

2011

rr_AnnualReturn2011

1.60%

2012

rr_AnnualReturn2012

3.13%

2013

rr_AnnualReturn2013

1.33%

2014

rr_AnnualReturn2014

0.95%

2015

rr_AnnualReturn2015

0.01%

2016

rr_AnnualReturn2016

1.73%

2017

rr_AnnualReturn2017

1.51%

Year to Date Return, Label

rr_YearToDateReturnLabel

Year-to-Date Return

Bar Chart, Year to Date Return, Date

rr_BarChartYearToDateReturnDate

Mar. 31, 2018

Bar Chart, Year to Date Return

rr_BarChartYearToDateReturn

(0.02%)

Highest Quarterly Return, Label

rr_HighestQuarterlyReturnLabel

Highest Quarter Return

Highest Quarterly Return, Date

rr_BarChartHighestQuarterlyReturnDate

Mar. 31, 2012

Highest Quarterly Return

rr_BarChartHighestQuarterlyReturn

1.01%

Lowest Quarterly Return, Label

rr_LowestQuarterlyReturnLabel

Lowest Quarter Return

Lowest Quarterly Return, Date

rr_BarChartLowestQuarterlyReturnDate

Sep. 30, 2015

Lowest Quarterly Return

rr_BarChartLowestQuarterlyReturn

(0.38%)

Past 1 Year

rr_AverageAnnualReturnYear01

1.51%

Past 5 Years

rr_AverageAnnualReturnYear05

1.10%

Since Inception

rr_AverageAnnualReturnSinceInception

1.41%

Inception Date

rr_AverageAnnualReturnInceptionDate

Oct. 18, 2010

Ultra Short-Term Bond Fund | Inst. Shares

Risk/Return:

rr_RiskReturnAbstract

Shareholder Fee, Other

rr_ShareholderFeeOther

none

Management Fee (fluctuates based on the Fund's performance relative to a securities market index)

rr_ManagementFeesOverAssets

0.24%

Distribution and/or Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

none

Other Expenses

rr_OtherExpensesOverAssets

0.51%

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

0.75%

Reimbursement from Adviser

rr_FeeWaiverOrReimbursementOverAssets

(0.20%)

^[1]

Total Annual Fund Operating Expenses after Reimbursement

rr_NetExpensesOverAssets

0.55%

1 Year

rr_ExpenseExampleYear01

$ 56

3 Years

rr_ExpenseExampleYear03

220

5 Years

rr_ExpenseExampleYear05

397

10 Years

rr_ExpenseExampleYear10

$ 912

Past 1 Year

rr_AverageAnnualReturnYear01

1.44%

Past 5 Years

rr_AverageAnnualReturnYear05

Since Inception

rr_AverageAnnualReturnSinceInception

1.14%

Inception Date

rr_AverageAnnualReturnInceptionDate

Jul. 12, 2013

Ultra Short-Term Bond Fund | R6 Shares

Risk/Return:

rr_RiskReturnAbstract

Shareholder Fee, Other

rr_ShareholderFeeOther

none

Management Fee (fluctuates based on the Fund's performance relative to a securities market index)

rr_ManagementFeesOverAssets

0.24%

Distribution and/or Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

none

Other Expenses

rr_OtherExpensesOverAssets

0.81%

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

1.05%

Reimbursement from Adviser

rr_FeeWaiverOrReimbursementOverAssets

(0.66%)

^[1]

Total Annual Fund Operating Expenses after Reimbursement

rr_NetExpensesOverAssets

0.39%

1 Year

rr_ExpenseExampleYear01

$ 40

3 Years

rr_ExpenseExampleYear03

268

5 Years

rr_ExpenseExampleYear05

515

10 Years

rr_ExpenseExampleYear10

$ 1,223

Ultra Short-Term Bond Fund | Return After Taxes on Distributions | Fund Shares

Risk/Return:

rr_RiskReturnAbstract

Past 1 Year

rr_AverageAnnualReturnYear01

0.81%

Past 5 Years

rr_AverageAnnualReturnYear05

0.50%

Since Inception

rr_AverageAnnualReturnSinceInception

0.82%

Ultra Short-Term Bond Fund | Return After Taxes on Distributions and Sale of Fund Shares | Fund Shares

Risk/Return:

rr_RiskReturnAbstract

Past 1 Year

rr_AverageAnnualReturnYear01

0.85%

Past 5 Years

rr_AverageAnnualReturnYear05

0.57%

Since Inception

rr_AverageAnnualReturnSinceInception

0.83%

Ultra Short-Term Bond Fund | Citigroup 3-Month U.S. Treasury Bill Index (reflects no deduction for fees, expenses, or taxes)

Risk/Return:

rr_RiskReturnAbstract

Past 1 Year

rr_AverageAnnualReturnYear01

0.84%

Past 5 Years

rr_AverageAnnualReturnYear05

0.24%

Since Inception

rr_AverageAnnualReturnSinceInception

0.19%

Inception Date

rr_AverageAnnualReturnInceptionDate

Oct. 18, 2010

^[2]

Ultra Short-Term Bond Fund | Lipper Ultra Short Obligations Funds Index (reflects no deduction for taxes)

Risk/Return:

rr_RiskReturnAbstract

Past 1 Year

rr_AverageAnnualReturnYear01

1.33%

Past 5 Years

rr_AverageAnnualReturnYear05

0.83%

Since Inception

rr_AverageAnnualReturnSinceInception

0.89%

Inception Date

rr_AverageAnnualReturnInceptionDate

Oct. 18, 2010

^[2]

[1] The Investment Adviser has agreed, through April 30, 2019, to make payments or waive management, administration, and other fees to limit the expenses of the Institutional Shares and the R6 Shares of the Fund so that the Total Annual Fund Operating Expenses (exclusive of commission recapture, expense offset arrangements, acquired fund fees and expenses, and extraordinary expenses) do not exceed an annual rate of 0.55% and 0.39% of the Institutional Shares' and the R6 Shares' average daily net assets, respectively. This reimbursement arrangement may not be changed or terminated during this time period without approval of the Fund's Board of Trustees and may be changed or terminated by the Investment Adviser any time after April 30, 2019.

[2] The average annual total return for the Citigroup 3-Month U.S. Treasury Bill Index and Lipper Ultra Short Obligations Funds Index from July 12, 2013, the inception date of the Institutional Shares, through December 31, 2017, was 0.27% and 0.91%, respectively.

XML

Real Return Fund

USAA Real Return Fund Summary

Investment Objective

The USAA Real Return Fund (the Fund) seeks a total return that exceeds the rate of inflation over an economic cycle.

Fees and Expenses

The tables below describe the fees and expenses that you may pay, directly and indirectly, to invest in the Fund. The annual fund operating expenses for the Fund Shares and Institutional Shares are based on expenses incurred during the Fund's most recently completed fiscal year.

Shareholder Fees

(fees paid directly from your investment)

Shareholder Fees - Real Return Fund - USD ($)	Fund Shares	Inst. Shares
Shareholder Fee, Other	none	none

Annual Fund Operating Expenses

(expenses that you pay each year as a percentage of the value of your investment)

Annual Fund Operating Expenses - Real Return Fund		Fund Shares	Inst. Shares
Management Fee		0.50%	0.50%
Distribution and/or Service (12b-1) Fees		none	none
Other Expenses		0.94%	0.53%
Acquired Fund Fees and Expenses		0.22%	0.22%
Total Annual Fund Operating Expenses	[1]	1.66%	1.25%
Reimbursement from Adviser	[2]	(0.44%)	(0.13%)
Total Annual Fund Operating Expenses after Reimbursement		1.22%	1.12%

Example

This example is intended to help you compare the cost of investing in this Fund with the cost of investing in other mutual funds. Although your actual costs may be higher or lower, you would pay the following expenses on a $10,000 investment, assuming (1) a 5% annual return, (2) the Fund's operating expenses remain the same, (3) you redeem all of your shares at the end of the periods shown, and (4) the expense reimbursement arrangement for the Fund Shares and Institutional Shares is not continued beyond one year.

Expense Example - Real Return Fund - USD ($)	1 Year	3 Years	5 Years	10 Years
Fund Shares	124	480	861	1,929
Inst. Shares	114	384	674	1,500

Portfolio Turnover

The Fund pays transaction costs, including 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 shares of the Fund are held in a taxable account. These costs, which are not reflected in the Annual Fund Operating Expenses or in the Example, affect the Fund's performance.

For the most recent fiscal year, the Fund's portfolio turnover rate was 14% of the average value of its whole portfolio.

Principal Investment Strategy

The Fund's principal investment strategy is to invest its assets principally in a portfolio of investments that the Adviser believes will have a total return that exceeds the rate of inflation over an economic cycle. In pursuing its investment objective, the Fund will allocate its assets under normal market conditions among the following asset classes: (1) inflation-linked securities, including U.S. Treasury inflation-protected securities (TIPS), non-U.S. dollar inflation-linked securities, and inflation-linked corporate and municipal securities; (2) fixed-income securities, including bank loans, floating-rate notes, short-duration bonds, investment-grade securities, high-yield bonds (also known as "junk" bonds), and non-U.S. dollar instruments, including foreign currencies; (3) equity securities, including real estate investment trusts (REITs) and exchange-traded funds (ETFs), including those that the Adviser believes have a high correlation to measures of inflation; and (4) commodity-linked instruments, such as commodity ETFs, commodity-linked notes, and other investment companies that concentrate their investments in commodity-linked instruments and to a limited extent, certain types of derivative instruments. In allocating the Fund's assets, the Adviser may invest all or a substantial portion of the Fund's assets in one or a limited number of these asset classes. Accordingly, the allocation of the Fund's assets among these classes may vary substantially from time to time.

Principal Risks

Any investment involves risk, and there is no assurance that the Fund's objective will be achieved. The Fund is actively managed and the investment techniques and risk analyses used by the Fund's manager(s) may not produce the desired results. As you consider an investment in the Fund, you also should take into account your tolerance for the daily fluctuations of the financial markets and whether you can afford to leave your money in the Fund for long periods of time to ride out down periods. As with other mutual funds, losing money is a risk of investing in the Fund.

The equity securities in the Fund's portfolio are subject to stock market risk. A company's stock price in general may decline over short or even extended periods, regardless of the success or failure of the company's operations. Stock markets tend to run in cycles, with periods when stock prices generally go up and periods when stock prices generally go down. Equity securities tend to be more volatile than debt securities. In addition, to the degree the Fund invests in foreign securities, there is a possibility that the value of the Fund's investments in foreign securities will decrease because of unique risks, such as currency exchange-rate fluctuations; foreign market illiquidity; emerging-market risk; increased price volatility; uncertain political conditions; exchange-control regulations; foreign ownership limits; different accounting, reporting, and disclosure requirements; difficulties in obtaining legal judgments; and foreign withholding taxes. These risks may be heightened to the extent the Fund invests in emerging-market countries. Emerging-market countries are less economically diverse and less mature than more developed countries and tend to be less politically stable.

The fixed-income securities 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. Fixed-income securities rated below investment grade, also known as "junk" or high-yield bonds, generally entail greater economic, credit, and liquidity risk than investment-grade securities. Their prices may be more volatile, especially during economic downturns, financial setbacks, or liquidity events.

The Fund is subject to the risk that the market value of the bonds in its portfolio will fluctuate because of changes in interest rates, changes in the supply of and demand for debt securities, and other market factors. Bond prices generally are linked to the prevailing market interest rates. In general, when interest rates rise, bond prices fall; and conversely, when interest rates fall, bond prices rise. The price volatility of a bond also depends on its maturity. Generally, the longer the maturity of a bond, the greater is its sensitivity to interest rates. To compensate investors for this higher interest rate risk, bonds with longer maturities generally offer higher yields than bonds with shorter maturities. The Fund may be subject to a greater risk of rising interest rates due to the current period of historically low rates. The ability of an issuer of a debt security to repay principal prior to a security's maturity can increase the security's sensitivity to interest rate changes.

The value of an individual security or particular type of security can be more volatile than, and can perform differently from, the market as a whole. A decline in the credit quality of an issuer, or of a provider of credit support or a maturity-shortening structure for a security, can cause the price of a security to decrease. Lower-quality debt securities (those of less than investment-grade quality) and certain types of other securities involve greater risk of default or of price changes due to changes in the credit quality of the issuer. The value of lower-quality debt securities and certain types of other securities can be more volatile due to increased sensitivity to adverse issuer, political, regulatory, market, or economic developments, and these securities can be difficult to resell.

A floating-rate loan may not be fully collateralized, which may cause the floating-rate loan to decline significantly in value. Floating-rate loans generally are subject to legal or contractual restrictions on resale and sometimes trade infrequently in the secondary market. As a result, valuing a floating-rate loan can be more difficult and buying and selling a floating rate-loan at an acceptable price can be more difficult or delayed. Difficulty in selling a floating-rate loan can result in a loss.

Commodity-linked investments may be more volatile and less liquid than the underlying commodity, instruments, or measures and their value may be affected by the performance of the overall commodities markets as well as by weather, or tax and other regulatory developments. As a result, returns of commodity-linked investments may deviate significantly from the return of the underlying commodity, instruments, or measures.

The Fund may invest in futures, options, and other types of derivatives. Risks associated with derivatives include the risk that the derivative is not well-correlated with the security, index, ETF, or currency to which it relates; the risk that the use of derivatives may not have the intended effects and may result in losses or missed opportunities; the risk that the Fund will be unable to sell the derivative because of an illiquid secondary market; the risk that a counterparty is unwilling or unable to meet its obligation; the risk of interest rate movements; and the risk that the derivatives transaction could expose the Fund to the effects of leverage, which could increase the Fund's exposure, magnify investment risk and losses, and cause losses to be realized more quickly. There is no guarantee that derivatives techniques will be employed or that they will work as intended, and their use could lower returns or even result in losses to the Fund.

Changes in real estate values or economic downturns can have a significant negative effect on issuers in the real estate industry, for example, REITs.

ETFs, which generally are registered investment companies, incur their own management and other fees and expenses, such as trustees' fees, operating expenses, registration fees, and marketing expenses, a proportionate share of which will be borne indirectly by the Fund as a shareholder in an ETF. As a result, the Fund's investment in an ETF will cause the Fund to indirectly bear the fees and expenses of the ETF and, in turn, the Fund's performance may be lower than if the Fund were to invest directly in the underlying securities held by the ETF. For investments in affiliated USAA ETFs, the Fund's management fee is reimbursed by the Adviser to the extent of the indirect management fee incurred through the Fund's investment in the affiliated ETFs. The Adviser is subject to potential conflicts of interest in allocating assets among affiliated and unaffiliated ETFs because the Adviser also is responsible for managing and administering the affiliated ETFs, and the Adviser and its affiliates receive other fees from the affiliated ETFs. In addition, the Fund also will be subject to the risks associated with the securities or other investments held by the ETFs.

The Fund is subject to legislative risk, which is the risk that changes in government policies may affect the value of the investments held by the Fund in ways we cannot anticipate, and that such policies could have an adverse impact on the value of the Fund's investments and the Fund's net asset value (NAV).

The risk of investing in securities that generally are less liquid than higher-quality securities is referred to as liquidity risk. The market for lower-quality issues generally is less liquid than the market for higher-quality issues. Therefore, large purchases or sales could cause sudden and significant price changes in these securities. Many lower-quality issues do not trade frequently; however, when they do trade, the trade price may be substantially higher or lower than expected.

An investment in the Fund is not a deposit in USAA Federal Savings Bank, or any other bank, and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.

Performance

The following bar chart and table are intended to help you understand the risks of investing in the Fund. The Fund has two classes of shares: Fund Shares and Institutional Shares. The bar chart provides some indication of the risks of investing in the Fund and illustrates the Fund Shares class's volatility and performance from year to year for each full calendar year since the Fund's inception. The table shows how the average annual total returns of the share classes for the periods indicated compared to those of the Fund's benchmark index. Performance reflects any expense limitations in effect during the periods shown.

Remember, historical performance (before and after taxes) does not necessarily indicate what will happen in the future. For the Fund's most current performance information, log on to usaa.com or call (800) 531-USAA (8722) or (210) 531-8722.

RISK/RETURN BAR CHART
Annual Returns for Periods Ended December 31

During the periods shown in the chart:	Returns	Quarter ended
Highest Quarter Return	4.93%	September 30, 2012
Lowest Quarter Return	-6.22%	September 30, 2015
Year-to-Date Return	-1.23%	March 31, 2018

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. In certain situations, the return after taxes on distributions and sale of fund shares may be higher than the other return amounts. A higher after-tax return may result when a capital loss occurs upon redemption and translates into an assumed tax deduction that benefits the shareholder. The actual after-tax returns depend on your tax situation and may differ from those shown. If you hold your shares through a tax-deferred arrangement, such as an individual retirement account (IRA) or 401(k) plan, the after-tax returns shown in the table are not relevant to you. Please note that after-tax returns are only shown for the Fund Shares and may differ for each share class.

AVERAGE ANNUAL TOTAL RETURNS
For Periods Ended December 31, 2017

Average Annual Total Returns - Real Return Fund		Past 1 Year	Past 5 Years	Since Inception	Inception Date
Fund Shares		8.35%	1.53%	2.97%	Oct. 18, 2010
Fund Shares | Return After Taxes on Distributions		7.85%	1.01%	2.24%
Fund Shares | Return After Taxes on Distributions and Sale of Fund Shares		4.72%	0.97%	2.05%
Inst. Shares		8.45%	1.65%	3.13%	Oct. 18, 2010
Bloomberg Barclays U.S. Government Inflation-Linked Bond Index (reflects no deduction for fees, expenses, or taxes)		3.30%	0.17%	2.47%	Oct. 18, 2010
Real Return Composite Index (reflects no deduction for fees, expenses, or taxes)	[1]	8.52%	2.55%	4.37%	Oct. 18, 2010

[1] The Total Annual Fund Operating Expenses for the Fund Shares and Institutional Shares may not correlate to the ratio of expenses to average daily net assets shown in the financial highlights, which reflect the operating expenses of the Fund Shares and Institutional Shares and do not include Acquired Fund Fees and Expenses.

[2] The Investment Adviser has agreed, through April 30, 2019, to make payments or waive management, administration, and other fees to limit the expenses of the Fund so that the Total Annual Fund Operating Expenses of the Fund Shares and Institutional Shares (exclusive of commission recapture, expense offset arrangements, acquired fund fees and expenses, and extraordinary expenses) do not exceed an annual rate of 1.00% and 0.90%, respectively, of the Fund Shares' and Institutional Shares' average daily net assets. This reimbursement arrangement may not be changed or terminated during this time period without approval of the Fund's Board of Trustees and may be changed or terminated by the Investment Adviser at any time after April 30, 2019.

[1] The Real Return Composite Index is a combination of unmanaged indexes representing the Fund's model allocation, and consists of the Morningstar Dividend Composite (15%), the MSCI U.S. REIT Gross (10%), the Bloomberg Barclays U.S. Inflation Link Bond (50%), the Bloomberg Commodity TR (15%), and the MSCI Emerging Markets (10%). The performance of the Real Return Composite Index is calculated from October 31, 2010, while the inception date of the Fund is October 18, 2010. There might be a slight variation of performance numbers because of the difference.

XML

Label

Element

Value

Risk/Return:

rr_RiskReturnAbstract

Registrant Name

dei_EntityRegistrantName

USAA MUTUAL FUNDS TRUST

Prospectus Date

rr_ProspectusDate

May 01, 2018

Real Return Fund

Risk/Return:

rr_RiskReturnAbstract

Risk/Return [Heading]

rr_RiskReturnHeading

USAA Real Return Fund Summary

Objective [Heading]

rr_ObjectiveHeading

Investment Objective

Objective, Primary [Text Block]

rr_ObjectivePrimaryTextBlock

The USAA Real Return Fund (the Fund) seeks a total return that exceeds the rate of inflation over an economic cycle.

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. The annual fund operating expenses for the Fund Shares and Institutional Shares are based on expenses incurred during the Fund's most recently completed fiscal year.

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)

Fee Waiver or Reimbursement over Assets, Date of Termination

rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination

April 30, 2019

Portfolio Turnover [Heading]

rr_PortfolioTurnoverHeading

Portfolio Turnover

Portfolio Turnover [Text Block]

rr_PortfolioTurnoverTextBlock

The Fund pays transaction costs, including 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 shares of the Fund are held in a taxable account. These costs, which are not reflected in the Annual Fund Operating Expenses or in the Example, affect the Fund's performance.

For the most recent fiscal year, the Fund's portfolio turnover rate was 14% of the average value of its whole portfolio.

Portfolio Turnover, Rate

rr_PortfolioTurnoverRate

14.00%

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 this Fund with the cost of investing in other mutual funds. Although your actual costs may be higher or lower, you would pay the following expenses on a $10,000 investment, assuming (1) a 5% annual return, (2) the Fund's operating expenses remain the same, (3) you redeem all of your shares at the end of the periods shown, and (4) the expense reimbursement arrangement for the Fund Shares and Institutional Shares is not continued beyond one year.

Strategy [Heading]

rr_StrategyHeading

Principal Investment Strategy

Strategy Narrative [Text Block]

rr_StrategyNarrativeTextBlock

The Fund's principal investment strategy is to invest its assets principally in a portfolio of investments that the Adviser believes will have a total return that exceeds the rate of inflation over an economic cycle. In pursuing its investment objective, the Fund will allocate its assets under normal market conditions among the following asset classes: (1) inflation-linked securities, including U.S. Treasury inflation-protected securities (TIPS), non-U.S. dollar inflation-linked securities, and inflation-linked corporate and municipal securities; (2) fixed-income securities, including bank loans, floating-rate notes, short-duration bonds, investment-grade securities, high-yield bonds (also known as "junk" bonds), and non-U.S. dollar instruments, including foreign currencies; (3) equity securities, including real estate investment trusts (REITs) and exchange-traded funds (ETFs), including those that the Adviser believes have a high correlation to measures of inflation; and (4) commodity-linked instruments, such as commodity ETFs, commodity-linked notes, and other investment companies that concentrate their investments in commodity-linked instruments and to a limited extent, certain types of derivative instruments. In allocating the Fund's assets, the Adviser may invest all or a substantial portion of the Fund's assets in one or a limited number of these asset classes. Accordingly, the allocation of the Fund's assets among these classes may vary substantially from time to time.

Risk [Heading]

rr_RiskHeading

Principal Risks

Risk Narrative [Text Block]

rr_RiskNarrativeTextBlock

Any investment involves risk, and there is no assurance that the Fund's objective will be achieved. The Fund is actively managed and the investment techniques and risk analyses used by the Fund's manager(s) may not produce the desired results. As you consider an investment in the Fund, you also should take into account your tolerance for the daily fluctuations of the financial markets and whether you can afford to leave your money in the Fund for long periods of time to ride out down periods. As with other mutual funds, losing money is a risk of investing in the Fund.

The equity securities in the Fund's portfolio are subject to stock market risk. A company's stock price in general may decline over short or even extended periods, regardless of the success or failure of the company's operations. Stock markets tend to run in cycles, with periods when stock prices generally go up and periods when stock prices generally go down. Equity securities tend to be more volatile than debt securities. In addition, to the degree the Fund invests in foreign securities, there is a possibility that the value of the Fund's investments in foreign securities will decrease because of unique risks, such as currency exchange-rate fluctuations; foreign market illiquidity; emerging-market risk; increased price volatility; uncertain political conditions; exchange-control regulations; foreign ownership limits; different accounting, reporting, and disclosure requirements; difficulties in obtaining legal judgments; and foreign withholding taxes. These risks may be heightened to the extent the Fund invests in emerging-market countries. Emerging-market countries are less economically diverse and less mature than more developed countries and tend to be less politically stable.

The fixed-income securities 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. Fixed-income securities rated below investment grade, also known as "junk" or high-yield bonds, generally entail greater economic, credit, and liquidity risk than investment-grade securities. Their prices may be more volatile, especially during economic downturns, financial setbacks, or liquidity events.

The Fund is subject to the risk that the market value of the bonds in its portfolio will fluctuate because of changes in interest rates, changes in the supply of and demand for debt securities, and other market factors. Bond prices generally are linked to the prevailing market interest rates. In general, when interest rates rise, bond prices fall; and conversely, when interest rates fall, bond prices rise. The price volatility of a bond also depends on its maturity. Generally, the longer the maturity of a bond, the greater is its sensitivity to interest rates. To compensate investors for this higher interest rate risk, bonds with longer maturities generally offer higher yields than bonds with shorter maturities. The Fund may be subject to a greater risk of rising interest rates due to the current period of historically low rates. The ability of an issuer of a debt security to repay principal prior to a security's maturity can increase the security's sensitivity to interest rate changes.

The value of an individual security or particular type of security can be more volatile than, and can perform differently from, the market as a whole. A decline in the credit quality of an issuer, or of a provider of credit support or a maturity-shortening structure for a security, can cause the price of a security to decrease. Lower-quality debt securities (those of less than investment-grade quality) and certain types of other securities involve greater risk of default or of price changes due to changes in the credit quality of the issuer. The value of lower-quality debt securities and certain types of other securities can be more volatile due to increased sensitivity to adverse issuer, political, regulatory, market, or economic developments, and these securities can be difficult to resell.

A floating-rate loan may not be fully collateralized, which may cause the floating-rate loan to decline significantly in value. Floating-rate loans generally are subject to legal or contractual restrictions on resale and sometimes trade infrequently in the secondary market. As a result, valuing a floating-rate loan can be more difficult and buying and selling a floating rate-loan at an acceptable price can be more difficult or delayed. Difficulty in selling a floating-rate loan can result in a loss.

Commodity-linked investments may be more volatile and less liquid than the underlying commodity, instruments, or measures and their value may be affected by the performance of the overall commodities markets as well as by weather, or tax and other regulatory developments. As a result, returns of commodity-linked investments may deviate significantly from the return of the underlying commodity, instruments, or measures.

The Fund may invest in futures, options, and other types of derivatives. Risks associated with derivatives include the risk that the derivative is not well-correlated with the security, index, ETF, or currency to which it relates; the risk that the use of derivatives may not have the intended effects and may result in losses or missed opportunities; the risk that the Fund will be unable to sell the derivative because of an illiquid secondary market; the risk that a counterparty is unwilling or unable to meet its obligation; the risk of interest rate movements; and the risk that the derivatives transaction could expose the Fund to the effects of leverage, which could increase the Fund's exposure, magnify investment risk and losses, and cause losses to be realized more quickly. There is no guarantee that derivatives techniques will be employed or that they will work as intended, and their use could lower returns or even result in losses to the Fund.

Changes in real estate values or economic downturns can have a significant negative effect on issuers in the real estate industry, for example, REITs.

ETFs, which generally are registered investment companies, incur their own management and other fees and expenses, such as trustees' fees, operating expenses, registration fees, and marketing expenses, a proportionate share of which will be borne indirectly by the Fund as a shareholder in an ETF. As a result, the Fund's investment in an ETF will cause the Fund to indirectly bear the fees and expenses of the ETF and, in turn, the Fund's performance may be lower than if the Fund were to invest directly in the underlying securities held by the ETF. For investments in affiliated USAA ETFs, the Fund's management fee is reimbursed by the Adviser to the extent of the indirect management fee incurred through the Fund's investment in the affiliated ETFs. The Adviser is subject to potential conflicts of interest in allocating assets among affiliated and unaffiliated ETFs because the Adviser also is responsible for managing and administering the affiliated ETFs, and the Adviser and its affiliates receive other fees from the affiliated ETFs. In addition, the Fund also will be subject to the risks associated with the securities or other investments held by the ETFs.

The Fund is subject to legislative risk, which is the risk that changes in government policies may affect the value of the investments held by the Fund in ways we cannot anticipate, and that such policies could have an adverse impact on the value of the Fund's investments and the Fund's net asset value (NAV).

The risk of investing in securities that generally are less liquid than higher-quality securities is referred to as liquidity risk. The market for lower-quality issues generally is less liquid than the market for higher-quality issues. Therefore, large purchases or sales could cause sudden and significant price changes in these securities. Many lower-quality issues do not trade frequently; however, when they do trade, the trade price may be substantially higher or lower than expected.

An investment in the Fund is not a deposit in USAA Federal Savings Bank, or any other bank, and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.

Risk Lose Money [Text]

rr_RiskLoseMoney

As with other mutual funds, losing money is a risk of investing in the Fund.

Risk Not Insured Depository Institution [Text]

rr_RiskNotInsuredDepositoryInstitution

An investment in the Fund is not a deposit in USAA Federal Savings Bank, or any other bank, and is not insured or guaranteed by the Federal Deposit Insurance Corporation 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 Fund has two classes of shares: Fund Shares and Institutional Shares. The bar chart provides some indication of the risks of investing in the Fund and illustrates the Fund Shares class's volatility and performance from year to year for each full calendar year since the Fund's inception. The table shows how the average annual total returns of the share classes for the periods indicated compared to those of the Fund's benchmark index. Performance reflects any expense limitations in effect during the periods shown.

Remember, historical performance (before and after taxes) does not necessarily indicate what will happen in the future. For the Fund's most current performance information, log on to usaa.com or call (800) 531-USAA (8722) or (210) 531-8722.

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 Shares class's volatility and performance from year to year for each full calendar year since the Fund's inception. The table shows how the average annual total returns of the share classes for the periods indicated compared to those of the Fund's benchmark index.

Performance Availability Phone [Text]

rr_PerformanceAvailabilityPhone

(800) 531-USAA (8722) or (210) 531-8722

Performance Availability Website Address [Text]

rr_PerformanceAvailabilityWebSiteAddress

usaa.com

Performance Past Does Not Indicate Future [Text]

rr_PerformancePastDoesNotIndicateFuture

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

During the periods shown in the chart:	Returns	Quarter ended
Highest Quarter Return	4.93%	September 30, 2012
Lowest Quarter Return	-6.22%	September 30, 2015
Year-to-Date Return	-1.23%	March 31, 2018

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. In certain situations, the return after taxes on distributions and sale of fund shares may be higher than the other return amounts. A higher after-tax return may result when a capital loss occurs upon redemption and translates into an assumed tax deduction that benefits the shareholder. The actual after-tax returns depend on your tax situation and may differ from those shown. If you hold your shares through a tax-deferred arrangement, such as an individual retirement account (IRA) or 401(k) plan, the after-tax returns shown in the table are not relevant to you. Please note that after-tax returns are only shown for the Fund Shares and may differ for each share class.

Performance Table Heading

rr_PerformanceTableHeading

AVERAGE ANNUAL TOTAL RETURNS
For Periods Ended December 31, 2017

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.

Performance Table Not Relevant to Tax Deferred

rr_PerformanceTableNotRelevantToTaxDeferred

If you hold your shares through a tax-deferred arrangement, such as an individual retirement account (IRA) or 401(k) plan, the after-tax returns shown in the table are not relevant to you.

Performance Table One Class of after Tax Shown [Text]

rr_PerformanceTableOneClassOfAfterTaxShown

Please note that after-tax returns are only shown for the Fund Shares and may differ for each share class.

Performance Table Explanation after Tax Higher

rr_PerformanceTableExplanationAfterTaxHigher

In certain situations, the return after taxes on distributions and sale of fund shares may be higher than the other return amounts. A higher after-tax return may result when a capital loss occurs upon redemption and translates into an assumed tax deduction that benefits the shareholder.

Real Return Fund | Fund Shares

Risk/Return:

rr_RiskReturnAbstract

Shareholder Fee, Other

rr_ShareholderFeeOther

none

Management Fee

rr_ManagementFeesOverAssets

0.50%

Distribution and/or Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

none

Other Expenses

rr_OtherExpensesOverAssets

0.94%

Acquired Fund Fees and Expenses

rr_AcquiredFundFeesAndExpensesOverAssets

0.22%

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

1.66%

^[1]

Reimbursement from Adviser

rr_FeeWaiverOrReimbursementOverAssets

(0.44%)

^[2]

Total Annual Fund Operating Expenses after Reimbursement

rr_NetExpensesOverAssets

1.22%

1 Year

rr_ExpenseExampleYear01

$ 124

3 Years

rr_ExpenseExampleYear03

480

5 Years

rr_ExpenseExampleYear05

861

10 Years

rr_ExpenseExampleYear10

$ 1,929

2011

rr_AnnualReturn2011

2.08%

2012

rr_AnnualReturn2012

11.13%

2013

rr_AnnualReturn2013

(0.44%)

2014

rr_AnnualReturn2014

0.27%

2015

rr_AnnualReturn2015

(7.75%)

2016

rr_AnnualReturn2016

8.13%

2017

rr_AnnualReturn2017

8.35%

Year to Date Return, Label

rr_YearToDateReturnLabel

Year-to-Date Return

Bar Chart, Year to Date Return, Date

rr_BarChartYearToDateReturnDate

Mar. 31, 2018

Bar Chart, Year to Date Return

rr_BarChartYearToDateReturn

(1.23%)

Highest Quarterly Return, Label

rr_HighestQuarterlyReturnLabel

Highest Quarter Return

Highest Quarterly Return, Date

rr_BarChartHighestQuarterlyReturnDate

Sep. 30, 2012

Highest Quarterly Return

rr_BarChartHighestQuarterlyReturn

4.93%

Lowest Quarterly Return, Label

rr_LowestQuarterlyReturnLabel

Lowest Quarter Return

Lowest Quarterly Return, Date

rr_BarChartLowestQuarterlyReturnDate

Sep. 30, 2015

Lowest Quarterly Return

rr_BarChartLowestQuarterlyReturn

(6.22%)

Past 1 Year

rr_AverageAnnualReturnYear01

8.35%

Past 5 Years

rr_AverageAnnualReturnYear05

1.53%

Since Inception

rr_AverageAnnualReturnSinceInception

2.97%

Inception Date

rr_AverageAnnualReturnInceptionDate

Oct. 18, 2010

Real Return Fund | Inst. Shares

Risk/Return:

rr_RiskReturnAbstract

Shareholder Fee, Other

rr_ShareholderFeeOther

none

Management Fee

rr_ManagementFeesOverAssets

0.50%

Distribution and/or Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

none

Other Expenses

rr_OtherExpensesOverAssets

0.53%

Acquired Fund Fees and Expenses

rr_AcquiredFundFeesAndExpensesOverAssets

0.22%

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

1.25%

^[1]

Reimbursement from Adviser

rr_FeeWaiverOrReimbursementOverAssets

(0.13%)

^[2]

Total Annual Fund Operating Expenses after Reimbursement

rr_NetExpensesOverAssets

1.12%

1 Year

rr_ExpenseExampleYear01

$ 114

3 Years

rr_ExpenseExampleYear03

384

5 Years

rr_ExpenseExampleYear05

674

10 Years

rr_ExpenseExampleYear10

$ 1,500

Past 1 Year

rr_AverageAnnualReturnYear01

8.45%

Past 5 Years

rr_AverageAnnualReturnYear05

1.65%

Since Inception

rr_AverageAnnualReturnSinceInception

3.13%

Inception Date

rr_AverageAnnualReturnInceptionDate

Oct. 18, 2010

Real Return Fund | Return After Taxes on Distributions | Fund Shares

Risk/Return:

rr_RiskReturnAbstract

Past 1 Year

rr_AverageAnnualReturnYear01

7.85%

Past 5 Years

rr_AverageAnnualReturnYear05

1.01%

Since Inception

rr_AverageAnnualReturnSinceInception

2.24%

Real Return Fund | Return After Taxes on Distributions and Sale of Fund Shares | Fund Shares

Risk/Return:

rr_RiskReturnAbstract

Past 1 Year

rr_AverageAnnualReturnYear01

4.72%

Past 5 Years

rr_AverageAnnualReturnYear05

0.97%

Since Inception

rr_AverageAnnualReturnSinceInception

2.05%

Real Return Fund | Bloomberg Barclays U.S. Government Inflation-Linked Bond Index (reflects no deduction for fees, expenses, or taxes)

Risk/Return:

rr_RiskReturnAbstract

Past 1 Year

rr_AverageAnnualReturnYear01

3.30%

Past 5 Years

rr_AverageAnnualReturnYear05

0.17%

Since Inception

rr_AverageAnnualReturnSinceInception

2.47%

Inception Date

rr_AverageAnnualReturnInceptionDate

Oct. 18, 2010

Real Return Fund | Real Return Composite Index (reflects no deduction for fees, expenses, or taxes)

Risk/Return:

rr_RiskReturnAbstract

Past 1 Year

rr_AverageAnnualReturnYear01

8.52%

^[3]

Past 5 Years

rr_AverageAnnualReturnYear05

2.55%

^[3]

Since Inception

rr_AverageAnnualReturnSinceInception

4.37%

^[3]

Inception Date

rr_AverageAnnualReturnInceptionDate

Oct. 18, 2010

^[3]

[1] The Total Annual Fund Operating Expenses for the Fund Shares and Institutional Shares may not correlate to the ratio of expenses to average daily net assets shown in the financial highlights, which reflect the operating expenses of the Fund Shares and Institutional Shares and do not include Acquired Fund Fees and Expenses.

[2] The Investment Adviser has agreed, through April 30, 2019, to make payments or waive management, administration, and other fees to limit the expenses of the Fund so that the Total Annual Fund Operating Expenses of the Fund Shares and Institutional Shares (exclusive of commission recapture, expense offset arrangements, acquired fund fees and expenses, and extraordinary expenses) do not exceed an annual rate of 1.00% and 0.90%, respectively, of the Fund Shares' and Institutional Shares' average daily net assets. This reimbursement arrangement may not be changed or terminated during this time period without approval of the Fund's Board of Trustees and may be changed or terminated by the Investment Adviser at any time after April 30, 2019.

[3] The Real Return Composite Index is a combination of unmanaged indexes representing the Fund's model allocation, and consists of the Morningstar Dividend Composite (15%), the MSCI U.S. REIT Gross (10%), the Bloomberg Barclays U.S. Inflation Link Bond (50%), the Bloomberg Commodity TR (15%), and the MSCI Emerging Markets (10%). The performance of the Real Return Composite Index is calculated from October 31, 2010, while the inception date of the Fund is October 18, 2010. There might be a slight variation of performance numbers because of the difference.

XML

Global Managed Volatility Fund

USAA Global Managed Volatility Fund Summary

Investment Objective

The USAA Global Managed Volatility Fund (the Fund) seeks to attain long-term capital appreciation while attempting to reduce volatility during unfavorable market conditions.

Fees and Expenses

The tables below describe the fees and expenses that you may pay, directly and indirectly, to invest in the Fund. The annual fund operating expenses for the Fund Shares and Institutional Shares are based on expenses incurred during the Fund's most recently completed fiscal year.

Shareholder Fees

(fees paid directly from your investment)

Shareholder Fees - Global Managed Volatility Fund - USD ($)	Fund Shares	Inst. Shares
Shareholder Fee, Other	none	none

Annual Fund Operating Expenses

(expenses that you pay each year as a percentage of the value of your investment)

Annual Fund Operating Expenses - Global Managed Volatility Fund		Fund Shares	Inst. Shares
Management Fee		0.60%	0.60%
Distribution and/or Service (12b-1) Fees		none	none
Other Expenses		0.49%	0.16%
Acquired Fund Fees and Expenses		0.18%	0.18%
Total Annual Fund Operating Expenses	[1]	1.27%	0.94%
Reimbursement from Adviser	[2]	(0.19%)	(0.06%)
Total Annual Fund Operating Expenses after Reimbursement		1.08%	0.88%

Example

This example is intended to help you compare the cost of investing in this Fund with the cost of investing in other mutual funds. Although your actual costs may be higher or lower, you would pay the following expenses on a $10,000 investment, assuming (1) a 5% annual return, (2) the Fund's operating expenses remain the same, (3) you redeem all of your shares at the end of the periods shown, and (4) the expense reimbursement arrangement for the Fund Shares and Institutional Shares is not continued beyond one year.

Expense Example - Global Managed Volatility Fund - USD ($)	1 Year	3 Years	5 Years	10 Years
Fund Shares	110	384	679	1,517
Inst. Shares	90	294	514	1,149

Portfolio Turnover

The Fund pays transaction costs, including 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 shares of the Fund are held in a taxable account. These costs, which are not reflected in the Annual Fund Operating Expenses or in the Example, affect the Fund's performance.

For the most recent fiscal year, the Fund's portfolio turnover rate was 48% of the average value of its whole portfolio.

Principal Investment Strategy

The Fund's principal strategy is to combine a portfolio of domestic and foreign equity securities, including emerging markets securities, with the use of alternative investment strategies to provide growth with lower volatility. The Fund intends to primarily invest in stocks and exchange-traded funds (ETFs) that invest primarily in stocks and may at times be fully invested in ETFs. The Fund may purchase affiliated USAA ETFs.

The Fund focuses on stocks and ETFs that emphasize certain investment factors such as momentum, value, and quality, or that could lower volatility in the Fund's returns. The Fund uses quantitative analysis to allocate exposure to individual factors in an attempt to limit the amount of risk any individual factor contributes to the Fund and to reduce the Fund's volatility. The Fund will adjust its investments among asset classes and factor exposures to take advantage of opportunities and to manage risk. The Fund may engage in active and frequent trading of portfolio holdings.

In an attempt to reduce the Fund's volatility over time, the Fund may implement an option-based risk-management strategy. This strategy involves purchasing and selling options on component indices or corresponding ETFs. This option strategy may not fully protect the Fund against declines in the value of its portfolio, and the Fund could experience a loss. The Fund also invests in other derivatives, including equity futures. Futures typically are used as a liquid and economical means of managing tactical allocations to asset classes or factors.

Diversification in the Fund's portfolio, combined with the use of call and put options, is designed to provide the Fund with fairly consistent returns over a wide range of market environments.

Principal Risks

Any investment involves risk, and there is no assurance that the Fund's objective will be achieved. The Fund is actively managed and the investment techniques and risk analyses used by the Fund's manager(s) may not produce the desired results. As you consider an investment in the Fund, you also should take into account your tolerance for the daily fluctuations of the financial markets and whether you can afford to leave your money in the Fund for long periods of time to ride out down periods. As with other mutual funds, losing money is a risk of investing in the Fund.

The equity securities in the Fund's portfolio are subject to stock market risk. A company's stock price in general may decline over short or even extended periods, regardless of the success or failure of the company's operations. Stock markets tend to run in cycles, with periods when stock prices generally go up and periods when stock prices generally go down. Equity securities tend to be more volatile than debt securities. In addition, to the degree the Fund invests in foreign securities, there is a possibility that the value of the Fund's investments in foreign securities will decrease because of unique risks, such as currency exchange-rate fluctuations; foreign market illiquidity; emerging market risk; increased price volatility; uncertain political conditions; exchange control regulations; foreign ownership limits; different accounting, reporting, and disclosure requirements; difficulties in obtaining legal judgments; and foreign withholding taxes. These risks may be heightened to the extent the Fund invests in emerging-market countries. Emerging-market countries are less economically diverse and less mature than more developed countries and tend to be less politically stable.

ETFs, which generally are registered investment companies, incur their own management and other fees and expenses, such as trustees' fees, operating expenses, registration fees, and marketing expenses, a proportionate share of which will be borne indirectly by the Fund as a shareholder in an ETF. As a result, the Fund's investment in an ETF will cause the Fund to indirectly bear the fees and expenses of the ETF and, in turn, the Fund's performance may be lower than if the Fund were to invest directly in the underlying securities held by the ETF. For investments in affiliated USAA ETFs, the Fund's management fee is reimbursed by the Adviser to the extent of the indirect management fee incurred through the Fund's investment in the affiliated ETFs. The Adviser is subject to potential conflicts of interest in allocating assets among affiliated and unaffiliated ETFs because the Adviser also is responsible for managing and administering the affiliated ETFs, and the Adviser and its affiliates receive other fees from the affiliated ETFs. In addition, the Fund also will be subject to the risks associated with the securities or other investments held by the ETFs.

The Adviser uses quantitative investment analysis when evaluating and selecting investments for the Fund. Quantitative tools used by the Adviser analyze stocks and other potential investments based on various investment characteristics or "factors" (such as momentum, value, quality, and volatility). Those factors may be out of favor or may not produce the best results over short or longer time periods. In addition, the effectiveness of the quantitative analysis of securities will significantly impact the success of the Fund's investment strategy. A portfolio of securities selected using quantitative analysis may underperform the market as a whole or a portfolio of securities selected using a different approach, such as fundamental analysis. The factors used in quantitative analysis and the emphasis placed on those factors may not be predictive of a security's value. Further, factors that affect a security's value can change over time and these changes may not be reflected in the Fund's portfolio. As a result, the Fund may have a lower return than if it were managed using a strategy that did not incorporate quantitative analysis.

The Fund may invest in futures, options, and other types of derivatives. Risks associated with derivatives include the risk that the derivative is not well-correlated with the security, index, ETF, or currency to which it relates; the risk that the use of derivatives may not have the intended effects and may result in losses, underperformance, or missed opportunities; the risk that the Fund will be unable to sell the derivative because of an illiquid secondary market; the risk that a counterparty is unwilling or unable to meet its obligation; the risk of interest rate movements; and the risk that the derivatives transaction could expose the Fund to the effects of leverage, which could increase the Fund's market exposure, magnify investment risks and losses, and cause losses to be realized more quickly. There is no guarantee that derivative techniques will be employed or that they will work as intended, and their use could lower returns or even result in losses to the Fund.

The Fund could experience a loss in the options portion of the portfolio, particularly during periods when market values are increasing but market volatility is high. When it sells index or corresponding ETF call options, the Fund receives cash but limits its opportunity to profit from an increase in the market value of its stock portfolio. When the Fund purchases index or corresponding ETF put options, it risks the loss of the cash paid for the options. At times, the Fund may not own put options, which increases exposure to a market decline. When the Fund simultaneously buys index put options and sells index put options to fund the purchases, resulting in an index put spread, the Fund has increased exposure to further market decline if the market price of the index falls below the strike price of the short index put option.

The Fund is subject to the risk associated with securities or practices that multiply small price movements into large changes in value. The more the Fund invests in leveraged instruments or strategies that use leveraged instruments, the more this leverage will magnify any losses on those investments.

The risk of investing in securities that generally are less liquid than higher-quality securities is referred to as liquidity risk. The market for lower-quality issues generally is less liquid than the market for higher-quality issues. Therefore, large purchases or sales could cause sudden and significant price changes in these securities. Many lower-quality issues do not trade frequently; however, when they do trade, the trade price may be substantially higher or lower than expected.

To implement the Fund's principal investment strategies and to take advantage of opportunities and manage risk, the Fund's securities may be actively and frequently traded. When the Fund engages in active and frequent trading, it will pay more in brokerage commissions than it would if it did not actively and frequently trade. While we will attempt to minimize any adverse impact to the Fund or its shareholders, the Fund may have a higher proportion of net realized capital gains, which would be taxable to shareholders when distributed to them, and a potentially lower return than a fund that does not actively and frequently trade.

An investment in the Fund is not a deposit in USAA Federal Savings Bank, or any other bank, and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.

Performance

The following bar chart and table are intended to help you understand the risks of investing in the Fund. The Fund has two classes of shares: Fund Shares and Institutional Shares. The bar chart provides some indication of the risks of investing in the Fund and illustrates the Institutional Shares' volatility and performance from year to year for each full calendar year since the Fund's inception. The table shows how the Institutional Shares' average annual total returns for the periods indicated compared to those of the Fund's benchmark index and an additional broad-based securities market index with investment characteristics similar to the Fund. Performance reflects any expense limitations in effect during the periods shown.

Remember, historical performance (before and after taxes) does not necessarily indicate what will happen in the future. For the Fund's most current performance information, log on to usaa.com or call (800) 531-USAA (8722) or (210) 531-8722.

RISK/RETURN BAR CHART
Annual Returns for Periods Ended December 31

During the periods shown in the chart:	Returns	Quarter ended
Highest Quarter Return	13.59%	June 30, 2009
Lowest Quarter Return	-11.40%	September 30, 2011
Year-to-Date Return	-0.37%	March 31, 2018

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. In certain situations, the return after taxes on distributions and sale of fund shares may be higher than the other return amounts. A higher after-tax return may result when a capital loss occurs upon redemption and translates into an assumed tax deduction that benefits the shareholder. The actual after-tax returns depend on your tax situation and may differ from those shown. If you hold your shares through a tax-deferred arrangement, such as an individual retirement account (IRA) or 401(k) plan, the after-tax returns shown in the table are not relevant to you. Please note that after-tax returns are only shown for the Institutional Shares and may differ for each share class.

AVERAGE ANNUAL TOTAL RETURNS
For Periods Ended December 31, 2017

Average Annual Total Returns - Global Managed Volatility Fund		Past 1 Year	Past 5 Years	Since Inception	Inception Date
Fund Shares		20.95%		6.05%	Jul. 12, 2013
Inst. Shares		21.24%	6.67%	4.75%	Jul. 31, 2008
Inst. Shares | Return After Taxes on Distributions		20.29%	5.21%	3.79%
Inst. Shares | Return After Taxes on Distributions and Sale of Fund Shares		12.10%	4.78%	3.57%
MSCI All-Country World Index (reflects no deduction for fees, expenses, or taxes)		23.97%	10.82%	6.52%	Jul. 31, 2008	[1]
Global Managed Volatility Composite Index (reflects no deduction for fees, expenses, or taxes)	[2]	17.00%	8.04%	4.95%	Jul. 31, 2008	[1]

[1] The Total Annual Fund Operating Expenses for the Fund Shares and Institutional Shares may not correlate to the ratio of expenses to average daily net assets shown in the financial highlights, which reflect the operating expenses of the Fund Shares and Institutional Shares and do not include Acquired Fund Fees and Expenses.

[2] The Investment Adviser has agreed, through April 30, 2019, to make payments or waive management, administration, and other fees to limit the expenses of the Fund Shares and Institutional Shares of the Fund so that the Total Annual Fund Operating Expenses (exclusive of commission recapture, expense offset arrangements, acquired fund fees and expenses, and extraordinary expenses) do not exceed an annual rate of 0.90% of the Fund Shares' and 0.70% of the Institutional Shares' average daily net assets, respectively. This reimbursement arrangement may not be changed or terminated during this time period without approval of the Fund's Board of Trustees and may be changed or terminated by the Investment Adviser at any time after April 30, 2019.

[1] The average annual total return for the MSCI All-Country World Index from July 12, 2013, inception date of the Fund Shares, through December 31, 2017, was 9.70%. The average annual total returns for the Global Managed Volatility Composite Index calculated from July 31, 2013, through December 31, 2017, was 7.67%. There may be a slight variation in performance because of the difference.

[2] The Global Managed Volatility Composite Index is a combination of unmanaged indexes representing the Fund's model allocation, and consists of the MSCI All-Country World Index (70%) and the Bloomberg Barclays U.S. Treasury – Bills (1-3M) (30%).

XML

Label

Element

Value

Risk/Return:

rr_RiskReturnAbstract

Registrant Name

dei_EntityRegistrantName

USAA MUTUAL FUNDS TRUST

Prospectus Date

rr_ProspectusDate

May 01, 2018

Global Managed Volatility Fund

Risk/Return:

rr_RiskReturnAbstract

Risk/Return [Heading]

rr_RiskReturnHeading

USAA Global Managed Volatility Fund Summary

Objective [Heading]

rr_ObjectiveHeading

Investment Objective

Objective, Primary [Text Block]

rr_ObjectivePrimaryTextBlock

The USAA Global Managed Volatility Fund (the Fund) seeks to attain long-term capital appreciation while attempting to reduce volatility during unfavorable market conditions.

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. The annual fund operating expenses for the Fund Shares and Institutional Shares are based on expenses incurred during the Fund's most recently completed fiscal year.

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)

Fee Waiver or Reimbursement over Assets, Date of Termination

rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination

April 30, 2019

Portfolio Turnover [Heading]

rr_PortfolioTurnoverHeading

Portfolio Turnover

Portfolio Turnover [Text Block]

rr_PortfolioTurnoverTextBlock

The Fund pays transaction costs, including 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 shares of the Fund are held in a taxable account. These costs, which are not reflected in the Annual Fund Operating Expenses or in the Example, affect the Fund's performance.

For the most recent fiscal year, the Fund's portfolio turnover rate was 48% of the average value of its whole portfolio.

Portfolio Turnover, Rate

rr_PortfolioTurnoverRate

48.00%

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 this Fund with the cost of investing in other mutual funds. Although your actual costs may be higher or lower, you would pay the following expenses on a $10,000 investment, assuming (1) a 5% annual return, (2) the Fund's operating expenses remain the same, (3) you redeem all of your shares at the end of the periods shown, and (4) the expense reimbursement arrangement for the Fund Shares and Institutional Shares is not continued beyond one year.

Strategy [Heading]

rr_StrategyHeading

Principal Investment Strategy

Strategy Narrative [Text Block]

rr_StrategyNarrativeTextBlock

The Fund's principal strategy is to combine a portfolio of domestic and foreign equity securities, including emerging markets securities, with the use of alternative investment strategies to provide growth with lower volatility. The Fund intends to primarily invest in stocks and exchange-traded funds (ETFs) that invest primarily in stocks and may at times be fully invested in ETFs. The Fund may purchase affiliated USAA ETFs.

The Fund focuses on stocks and ETFs that emphasize certain investment factors such as momentum, value, and quality, or that could lower volatility in the Fund's returns. The Fund uses quantitative analysis to allocate exposure to individual factors in an attempt to limit the amount of risk any individual factor contributes to the Fund and to reduce the Fund's volatility. The Fund will adjust its investments among asset classes and factor exposures to take advantage of opportunities and to manage risk. The Fund may engage in active and frequent trading of portfolio holdings.

In an attempt to reduce the Fund's volatility over time, the Fund may implement an option-based risk-management strategy. This strategy involves purchasing and selling options on component indices or corresponding ETFs. This option strategy may not fully protect the Fund against declines in the value of its portfolio, and the Fund could experience a loss. The Fund also invests in other derivatives, including equity futures. Futures typically are used as a liquid and economical means of managing tactical allocations to asset classes or factors.

Diversification in the Fund's portfolio, combined with the use of call and put options, is designed to provide the Fund with fairly consistent returns over a wide range of market environments.

Risk [Heading]

rr_RiskHeading

Principal Risks

Risk Narrative [Text Block]

rr_RiskNarrativeTextBlock

Any investment involves risk, and there is no assurance that the Fund's objective will be achieved. The Fund is actively managed and the investment techniques and risk analyses used by the Fund's manager(s) may not produce the desired results. As you consider an investment in the Fund, you also should take into account your tolerance for the daily fluctuations of the financial markets and whether you can afford to leave your money in the Fund for long periods of time to ride out down periods. As with other mutual funds, losing money is a risk of investing in the Fund.

The equity securities in the Fund's portfolio are subject to stock market risk. A company's stock price in general may decline over short or even extended periods, regardless of the success or failure of the company's operations. Stock markets tend to run in cycles, with periods when stock prices generally go up and periods when stock prices generally go down. Equity securities tend to be more volatile than debt securities. In addition, to the degree the Fund invests in foreign securities, there is a possibility that the value of the Fund's investments in foreign securities will decrease because of unique risks, such as currency exchange-rate fluctuations; foreign market illiquidity; emerging market risk; increased price volatility; uncertain political conditions; exchange control regulations; foreign ownership limits; different accounting, reporting, and disclosure requirements; difficulties in obtaining legal judgments; and foreign withholding taxes. These risks may be heightened to the extent the Fund invests in emerging-market countries. Emerging-market countries are less economically diverse and less mature than more developed countries and tend to be less politically stable.

ETFs, which generally are registered investment companies, incur their own management and other fees and expenses, such as trustees' fees, operating expenses, registration fees, and marketing expenses, a proportionate share of which will be borne indirectly by the Fund as a shareholder in an ETF. As a result, the Fund's investment in an ETF will cause the Fund to indirectly bear the fees and expenses of the ETF and, in turn, the Fund's performance may be lower than if the Fund were to invest directly in the underlying securities held by the ETF. For investments in affiliated USAA ETFs, the Fund's management fee is reimbursed by the Adviser to the extent of the indirect management fee incurred through the Fund's investment in the affiliated ETFs. The Adviser is subject to potential conflicts of interest in allocating assets among affiliated and unaffiliated ETFs because the Adviser also is responsible for managing and administering the affiliated ETFs, and the Adviser and its affiliates receive other fees from the affiliated ETFs. In addition, the Fund also will be subject to the risks associated with the securities or other investments held by the ETFs.

The Adviser uses quantitative investment analysis when evaluating and selecting investments for the Fund. Quantitative tools used by the Adviser analyze stocks and other potential investments based on various investment characteristics or "factors" (such as momentum, value, quality, and volatility). Those factors may be out of favor or may not produce the best results over short or longer time periods. In addition, the effectiveness of the quantitative analysis of securities will significantly impact the success of the Fund's investment strategy. A portfolio of securities selected using quantitative analysis may underperform the market as a whole or a portfolio of securities selected using a different approach, such as fundamental analysis. The factors used in quantitative analysis and the emphasis placed on those factors may not be predictive of a security's value. Further, factors that affect a security's value can change over time and these changes may not be reflected in the Fund's portfolio. As a result, the Fund may have a lower return than if it were managed using a strategy that did not incorporate quantitative analysis.

The Fund may invest in futures, options, and other types of derivatives. Risks associated with derivatives include the risk that the derivative is not well-correlated with the security, index, ETF, or currency to which it relates; the risk that the use of derivatives may not have the intended effects and may result in losses, underperformance, or missed opportunities; the risk that the Fund will be unable to sell the derivative because of an illiquid secondary market; the risk that a counterparty is unwilling or unable to meet its obligation; the risk of interest rate movements; and the risk that the derivatives transaction could expose the Fund to the effects of leverage, which could increase the Fund's market exposure, magnify investment risks and losses, and cause losses to be realized more quickly. There is no guarantee that derivative techniques will be employed or that they will work as intended, and their use could lower returns or even result in losses to the Fund.

The Fund could experience a loss in the options portion of the portfolio, particularly during periods when market values are increasing but market volatility is high. When it sells index or corresponding ETF call options, the Fund receives cash but limits its opportunity to profit from an increase in the market value of its stock portfolio. When the Fund purchases index or corresponding ETF put options, it risks the loss of the cash paid for the options. At times, the Fund may not own put options, which increases exposure to a market decline. When the Fund simultaneously buys index put options and sells index put options to fund the purchases, resulting in an index put spread, the Fund has increased exposure to further market decline if the market price of the index falls below the strike price of the short index put option.

The Fund is subject to the risk associated with securities or practices that multiply small price movements into large changes in value. The more the Fund invests in leveraged instruments or strategies that use leveraged instruments, the more this leverage will magnify any losses on those investments.

The risk of investing in securities that generally are less liquid than higher-quality securities is referred to as liquidity risk. The market for lower-quality issues generally is less liquid than the market for higher-quality issues. Therefore, large purchases or sales could cause sudden and significant price changes in these securities. Many lower-quality issues do not trade frequently; however, when they do trade, the trade price may be substantially higher or lower than expected.

To implement the Fund's principal investment strategies and to take advantage of opportunities and manage risk, the Fund's securities may be actively and frequently traded. When the Fund engages in active and frequent trading, it will pay more in brokerage commissions than it would if it did not actively and frequently trade. While we will attempt to minimize any adverse impact to the Fund or its shareholders, the Fund may have a higher proportion of net realized capital gains, which would be taxable to shareholders when distributed to them, and a potentially lower return than a fund that does not actively and frequently trade.

An investment in the Fund is not a deposit in USAA Federal Savings Bank, or any other bank, and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.

Risk Lose Money [Text]

rr_RiskLoseMoney

As with other mutual funds, losing money is a risk of investing in the Fund.

Risk Not Insured Depository Institution [Text]

rr_RiskNotInsuredDepositoryInstitution

An investment in the Fund is not a deposit in USAA Federal Savings Bank, or any other bank, and is not insured or guaranteed by the Federal Deposit Insurance Corporation 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 Fund has two classes of shares: Fund Shares and Institutional Shares. The bar chart provides some indication of the risks of investing in the Fund and illustrates the Institutional Shares' volatility and performance from year to year for each full calendar year since the Fund's inception. The table shows how the Institutional Shares' average annual total returns for the periods indicated compared to those of the Fund's benchmark index and an additional broad-based securities market index with investment characteristics similar to the Fund. Performance reflects any expense limitations in effect during the periods shown.

Remember, historical performance (before and after taxes) does not necessarily indicate what will happen in the future. For the Fund's most current performance information, log on to usaa.com or call (800) 531-USAA (8722) or (210) 531-8722.

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 Institutional Shares' volatility and performance from year to year for each full calendar year since the Fund's inception. The table shows how the Institutional Shares' average annual total returns for the periods indicated compared to those of the Fund's benchmark index and an additional broad-based securities market index with investment characteristics similar to the Fund.

Performance Availability Phone [Text]

rr_PerformanceAvailabilityPhone

(800) 531-USAA (8722) or (210) 531-8722

Performance Availability Website Address [Text]

rr_PerformanceAvailabilityWebSiteAddress

usaa.com

Performance Past Does Not Indicate Future [Text]

rr_PerformancePastDoesNotIndicateFuture

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

During the periods shown in the chart:	Returns	Quarter ended
Highest Quarter Return	13.59%	June 30, 2009
Lowest Quarter Return	-11.40%	September 30, 2011
Year-to-Date Return	-0.37%	March 31, 2018

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. In certain situations, the return after taxes on distributions and sale of fund shares may be higher than the other return amounts. A higher after-tax return may result when a capital loss occurs upon redemption and translates into an assumed tax deduction that benefits the shareholder. The actual after-tax returns depend on your tax situation and may differ from those shown. If you hold your shares through a tax-deferred arrangement, such as an individual retirement account (IRA) or 401(k) plan, the after-tax returns shown in the table are not relevant to you. Please note that after-tax returns are only shown for the Institutional Shares and may differ for each share class.

Performance Table Heading

rr_PerformanceTableHeading

AVERAGE ANNUAL TOTAL RETURNS
For Periods Ended December 31, 2017

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.

Performance Table Not Relevant to Tax Deferred

rr_PerformanceTableNotRelevantToTaxDeferred

If you hold your shares through a tax-deferred arrangement, such as an individual retirement account (IRA) or 401(k) plan, the after-tax returns shown in the table are not relevant to you.

Performance Table One Class of after Tax Shown [Text]

rr_PerformanceTableOneClassOfAfterTaxShown

Please note that after-tax returns are only shown for the Institutional Shares and may differ for each share class.

Performance Table Explanation after Tax Higher

rr_PerformanceTableExplanationAfterTaxHigher

In certain situations, the return after taxes on distributions and sale of fund shares may be higher than the other return amounts. A higher after-tax return may result when a capital loss occurs upon redemption and translates into an assumed tax deduction that benefits the shareholder.

Global Managed Volatility Fund | Fund Shares

Risk/Return:

rr_RiskReturnAbstract

Shareholder Fee, Other

rr_ShareholderFeeOther

none

Management Fee

rr_ManagementFeesOverAssets

0.60%

Distribution and/or Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

none

Other Expenses

rr_OtherExpensesOverAssets

0.49%

Acquired Fund Fees and Expenses

rr_AcquiredFundFeesAndExpensesOverAssets

0.18%

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

1.27%

^[1]

Reimbursement from Adviser

rr_FeeWaiverOrReimbursementOverAssets

(0.19%)

^[2]

Total Annual Fund Operating Expenses after Reimbursement

rr_NetExpensesOverAssets

1.08%

1 Year

rr_ExpenseExampleYear01

$ 110

3 Years

rr_ExpenseExampleYear03

384

5 Years

rr_ExpenseExampleYear05

679

10 Years

rr_ExpenseExampleYear10

$ 1,517

2009

rr_AnnualReturn2009

18.90%

2010

rr_AnnualReturn2010

2.37%

2011

rr_AnnualReturn2011

(3.40%)

2012

rr_AnnualReturn2012

10.02%

2013

rr_AnnualReturn2013

12.17%

2014

rr_AnnualReturn2014

(1.39%)

2015

rr_AnnualReturn2015

(3.27%)

2016

rr_AnnualReturn2016

6.46%

2017

rr_AnnualReturn2017

21.24%

Year to Date Return, Label

rr_YearToDateReturnLabel

Year-to-Date Return

Bar Chart, Year to Date Return, Date

rr_BarChartYearToDateReturnDate

Mar. 31, 2018

Bar Chart, Year to Date Return

rr_BarChartYearToDateReturn

(0.37%)

Highest Quarterly Return, Label

rr_HighestQuarterlyReturnLabel

Highest Quarter Return

Highest Quarterly Return, Date

rr_BarChartHighestQuarterlyReturnDate

Jun. 30, 2009

Highest Quarterly Return

rr_BarChartHighestQuarterlyReturn

13.59%

Lowest Quarterly Return, Label

rr_LowestQuarterlyReturnLabel

Lowest Quarter Return

Lowest Quarterly Return, Date

rr_BarChartLowestQuarterlyReturnDate

Sep. 30, 2011

Lowest Quarterly Return

rr_BarChartLowestQuarterlyReturn

(11.40%)

Past 1 Year

rr_AverageAnnualReturnYear01

20.95%

Past 5 Years

rr_AverageAnnualReturnYear05

Since Inception

rr_AverageAnnualReturnSinceInception

6.05%

Inception Date

rr_AverageAnnualReturnInceptionDate

Jul. 12, 2013

Global Managed Volatility Fund | Inst. Shares

Risk/Return:

rr_RiskReturnAbstract

Shareholder Fee, Other

rr_ShareholderFeeOther

none

Management Fee

rr_ManagementFeesOverAssets

0.60%

Distribution and/or Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

none

Other Expenses

rr_OtherExpensesOverAssets

0.16%

Acquired Fund Fees and Expenses

rr_AcquiredFundFeesAndExpensesOverAssets

0.18%

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

0.94%

^[1]

Reimbursement from Adviser

rr_FeeWaiverOrReimbursementOverAssets

(0.06%)

^[2]

Total Annual Fund Operating Expenses after Reimbursement

rr_NetExpensesOverAssets

0.88%

1 Year

rr_ExpenseExampleYear01

$ 90

3 Years

rr_ExpenseExampleYear03

294

5 Years

rr_ExpenseExampleYear05

514

10 Years

rr_ExpenseExampleYear10

$ 1,149

Past 1 Year

rr_AverageAnnualReturnYear01

21.24%

Past 5 Years

rr_AverageAnnualReturnYear05

6.67%

Since Inception

rr_AverageAnnualReturnSinceInception

4.75%

Inception Date

rr_AverageAnnualReturnInceptionDate

Jul. 31, 2008

Global Managed Volatility Fund | Return After Taxes on Distributions | Inst. Shares

Risk/Return:

rr_RiskReturnAbstract

Past 1 Year

rr_AverageAnnualReturnYear01

20.29%

Past 5 Years

rr_AverageAnnualReturnYear05

5.21%

Since Inception

rr_AverageAnnualReturnSinceInception

3.79%

Global Managed Volatility Fund | Return After Taxes on Distributions and Sale of Fund Shares | Inst. Shares

Risk/Return:

rr_RiskReturnAbstract

Past 1 Year

rr_AverageAnnualReturnYear01

12.10%

Past 5 Years

rr_AverageAnnualReturnYear05

4.78%

Since Inception

rr_AverageAnnualReturnSinceInception

3.57%

Global Managed Volatility Fund | MSCI All-Country World Index (reflects no deduction for fees, expenses, or taxes)

Risk/Return:

rr_RiskReturnAbstract

Past 1 Year

rr_AverageAnnualReturnYear01

23.97%

Past 5 Years

rr_AverageAnnualReturnYear05

10.82%

Since Inception

rr_AverageAnnualReturnSinceInception

6.52%

Inception Date

rr_AverageAnnualReturnInceptionDate

Jul. 31, 2008

^[3]

Global Managed Volatility Fund | Global Managed Volatility Composite Index (reflects no deduction for fees, expenses, or taxes)

Risk/Return:

rr_RiskReturnAbstract

Past 1 Year

rr_AverageAnnualReturnYear01

17.00%

^[4]

Past 5 Years

rr_AverageAnnualReturnYear05

8.04%

^[4]

Since Inception

rr_AverageAnnualReturnSinceInception

4.95%

^[4]

Inception Date

rr_AverageAnnualReturnInceptionDate

Jul. 31, 2008

^[3],[4]

[1] The Total Annual Fund Operating Expenses for the Fund Shares and Institutional Shares may not correlate to the ratio of expenses to average daily net assets shown in the financial highlights, which reflect the operating expenses of the Fund Shares and Institutional Shares and do not include Acquired Fund Fees and Expenses.

[2] The Investment Adviser has agreed, through April 30, 2019, to make payments or waive management, administration, and other fees to limit the expenses of the Fund Shares and Institutional Shares of the Fund so that the Total Annual Fund Operating Expenses (exclusive of commission recapture, expense offset arrangements, acquired fund fees and expenses, and extraordinary expenses) do not exceed an annual rate of 0.90% of the Fund Shares' and 0.70% of the Institutional Shares' average daily net assets, respectively. This reimbursement arrangement may not be changed or terminated during this time period without approval of the Fund's Board of Trustees and may be changed or terminated by the Investment Adviser at any time after April 30, 2019.

[3] The average annual total return for the MSCI All-Country World Index from July 12, 2013, inception date of the Fund Shares, through December 31, 2017, was 9.70%. The average annual total returns for the Global Managed Volatility Composite Index calculated from July 31, 2013, through December 31, 2017, was 7.67%. There may be a slight variation in performance because of the difference.

[4] The Global Managed Volatility Composite Index is a combination of unmanaged indexes representing the Fund's model allocation, and consists of the MSCI All-Country World Index (70%) and the Bloomberg Barclays U.S. Treasury – Bills (1-3M) (30%).

XML

Flexible Income Fund

USAA Flexible Income Fund Summary

Investment Objective

The USAA Flexible Income Fund (the Fund) seeks total return through a combination of income and capital appreciation.

Fees and Expenses

The tables below describe the fees and expenses that you may pay, directly and indirectly, to invest in the Fund. The annual fund operating expenses for the Fund Shares, Institutional Shares, and Adviser Shares are based on expenses incurred during the Fund's most recently completed fiscal year.

Shareholder Fees

(fees paid directly from your investment)

Shareholder Fees - Flexible Income Fund	Fund Shares	Inst. Shares	Adviser Shares
Shareholder Fee, Other	none	none	none

Annual Fund Operating Expenses

(expenses that you pay each year as a percentage of the value of your investment)

Annual Fund Operating Expenses - Flexible Income Fund		Fund Shares	Inst. Shares	Adviser Shares
Management Fee		0.50%	0.50%	0.50%
Distribution and/or Service (12b-1) Fees		none	none	0.25%
Other Expenses		0.67%	0.55%	0.81%
Acquired Fund Fees and Expenses		0.05%	0.05%	0.05%
Total Annual Fund Operating Expenses	[1]	1.22%	1.10%	1.61%
Reimbursement from Adviser	[2]	(0.27%)	(0.25%)	(0.41%)
Total Annual Fund Operating Expenses after Reimbursement		0.95%	0.85%	1.20%

Example

This example is intended to help you compare the cost of investing in this Fund with the cost of investing in other mutual funds. Although your actual costs may be higher or lower, you would pay the following expenses on a $10,000 investment, assuming (1) a 5% annual return, (2) the Fund's operating expenses remain the same, (3) you redeem all of your shares at the end of the periods shown, and (4) the expense reimbursement arrangement for the Fund Shares, Institutional Shares, and Adviser Shares is not continued beyond one year.

Expense Example - Flexible Income Fund - USD ($)	1 Year	3 Years	5 Years	10 Years
Fund Shares	97	360	644	1,453
Inst. Shares	87	325	582	1,318
Adviser Shares	122	468	837	1,877

Portfolio Turnover

The Fund pays transaction costs, including 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 shares of the Fund are held in a taxable account. These costs, which are not reflected in the Annual Fund Operating Expenses or in the Example, affect the Fund's performance.

For the most recent fiscal year, the Fund's portfolio turnover rate was 25% of the average value of its whole portfolio.

Principal Investment Strategy

Under normal market conditions, the Fund will invest in income-producing securities that carry the most attractive opportunity for total return, regardless of maturity or credit rating. The Fund may invest to a significant extent in investment-grade U.S. bonds, high-yield bonds (commonly referred to as "junk" bonds), bank loans, non-dollar-denominated bonds, and equity securities. In addition, the Fund may invest up to 40% of its assets in foreign non-dollar-denominated securities traded outside the United States, and may invest without limitation in dollar-denominated securities of foreign issuers. Investments in the securities of foreign issuers may include securities issued in emerging markets as well as securities issued in established markets. The Fund also may use various techniques, including, among others, entering into derivatives transactions (such as futures and options), currency exchange contracts, and swap agreements, to increase or decrease its exposure to changing security prices, interest rates, commodity prices, or other factors that affect security values.

For the purposes of this Fund, "bonds" may include corporate debt securities; obligations of U.S., state, and local governments, their agencies and instrumentalities; and mortgage- and asset-backed securities. For the purposes of this Fund, "equity securities" may include common stock, preferred stock, trust or limited partnership interests, rights and warrants to subscribe to or purchase such securities, sponsored or unsponsored American depositary receipts (ADRs), European depositary receipts (EDRs), global depositary receipts (GDRs), exchange-traded funds (ETFs), and convertible securities.

Principal Risks

Any investment involves risk, and there is no assurance that the Fund's objective will be achieved. The Fund is actively managed and the investment techniques and risk analyses used by the Fund's manager(s) may not produce the desired results. As you consider an investment in the Fund, you also should take into account your tolerance for the daily fluctuations of the financial markets and whether you can afford to leave your money in the Fund for long periods of time to ride out down periods. As with other mutual funds, losing money is a risk of investing in the Fund.

The equity securities in the Fund's portfolio are subject to stock market risk. A company's stock price in general may decline over short or even extended periods, regardless of the success or failure of the company's operations. Stock markets tend to run in cycles, with periods when stock prices generally go up and periods when stock prices generally go down. Equity securities tend to be more volatile than debt securities. In addition, to the degree the Fund invests in foreign securities, there is a possibility that the value of the Fund's investments in foreign securities will decrease because of unique risks, such as currency exchange-rate fluctuations; foreign market illiquidity; emerging-market risk; increased price volatility; uncertain political conditions; exchange control regulations; foreign ownership limits; different accounting, reporting, and disclosure requirements; difficulties in obtaining legal judgments; and foreign withholding taxes. These risks may be heightened to the extent the Fund invests in emerging-market countries. Emerging-market countries are less economically diverse and less mature than more developed countries and tend to be less politically stable.

The fixed-income securities 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. Fixed-income securities rated below investment grade, also known as "junk" or high-yield bonds, generally entail greater economic, credit, and liquidity risk than investment-grade securities. Their prices may be more volatile, especially during economic downturns, financial setbacks, or liquidity events.

The Fund is subject to the risk that the market value of the bonds in its portfolio will fluctuate because of changes in interest rates, changes in the supply of and demand for fixed-income securities, and other market factors. Bond prices generally are linked to the prevailing market interest rates. In general, when interest rates rise, bond prices fall; and conversely, when interest rates fall, bond prices rise. The price volatility of a bond also depends on its maturity. Generally, the longer the maturity of a bond, the greater is its sensitivity to interest rates. To compensate investors for this higher interest rate risk, bonds with longer maturities generally offer higher yields than bonds with shorter maturities. The Fund may be subject to a greater risk of rising interest rates due to the current period of historically low rates. The ability of an issuer of a debt security to repay principal prior to a security's maturity can increase the security's sensitivity to interest rate changes.

The Fund may invest in futures, options, and other types of derivatives. Risks associated with derivatives include the risk that the derivative is not well-correlated with the security, index, ETF, or currency to which it relates; the risk that the use of derivatives may not have the intended effects and may result in losses, underperformance, or missed opportunities; the risk that the Fund will be unable to sell the derivative because of an illiquid secondary market; the risk that a counterparty is unwilling or unable to meet its obligation; the risk of interest rate movements; and the risk that the derivatives transaction could expose the Fund to the effects of leverage, which could increase the Fund's market exposure, magnify investment risks and losses, and cause losses to be realized more quickly. There is no guarantee that derivative techniques will be employed or that they will work as intended, and their use could lower returns or even result in losses to the Fund.

The Fund is subject to legislative risk, which is the risk that changes in government policies may affect the value of the investments held by the Fund in ways we cannot anticipate, and that such policies could have an adverse impact on the value of the Fund's investments and the Fund's net asset value (NAV).

The risk of investing in securities that generally are less liquid than higher-quality securities is referred to as liquidity risk. The market for lower-quality issues generally is less liquid than the market for higher-quality issues. Therefore, large purchases or sales could cause sudden and significant price changes in these securities. Many lower-quality issues do not trade frequently; however, when they do trade, the trade price may be substantially higher or lower than expected.

The Fund is subject to prepayment and extension risk. The Fund can invest in mortgage-backed securities. These securities make regularly scheduled payments of principal along with interest payments. In addition, mortgagors generally have the option of paying off their mortgages without penalty at any time. For example, when a mortgaged property is sold, the old mortgage is usually prepaid. Also, when interest rates fall, the mortgagor may refinance the mortgage and prepay the old mortgage. A homeowner's default on the mortgage also may cause a prepayment of the mortgage. This unpredictability of the mortgage's cash flow is called prepayment risk. For the investor, prepayment risk usually means that principal is received at the least opportune time. For example, when interest rates fall, homeowners may find it advantageous to refinance their mortgages and prepay principal. In this case, the investor is forced to reinvest the principal at the current lower rate. On the other hand, when interest rates rise, homeowners generally will not refinance their mortgages and prepayments will fall. This causes the average life of the mortgage to extend and be more sensitive to interest rates, which sometimes is called extension risk. In addition, the amount of principal the investor has to invest in these higher interest rates is reduced.

An investment in the Fund is not a deposit in USAA Federal Savings Bank, or any other bank, and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.

Performance

The following bar chart and table are intended to help you understand the risks of investing in the Fund. The Fund has three classes of shares: Fund Shares, Institutional Shares, and Adviser Shares. The bar chart provides some indication of the risks of investing in the Fund and illustrates the Fund Shares class's volatility and performance from year to year for each full calendar year since the Fund's inception. The table shows how the average annual total returns of the share classes for the periods indicated compared to those of the Fund's benchmark index. Performance reflects any expense limitations in effect during the periods shown.

Remember, historical performance (before and after taxes) does not necessarily indicate what will happen in the future. For the Fund's most current performance information, log on to usaa.com or call (800) 531-USAA (8722) or (210) 531-8722.

RISK/RETURN BAR CHART
Annual Returns for Periods Ended December 31

During the periods shown in the chart:	Returns	Quarter ended
Highest Quarter Return	7.90%	June 30, 2016
Lowest Quarter Return	-4.30%	December 31, 2016
Year-to-Date Return	-3.91%	March 31, 2018

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. In certain situations, the return after taxes on distributions and sale of fund shares may be higher than the other return amounts. A higher after-tax return may result when a capital loss occurs upon redemption and translates into an assumed tax deduction that benefits the shareholder. The actual after-tax returns depend on your tax situation and may differ from those shown. If you hold your shares through a tax-deferred arrangement, such as an individual retirement account (IRA) or 401(k) plan, the after-tax returns shown in the table are not relevant to you. Please note that after-tax returns are only shown for the Fund Shares and may differ for each share class.

AVERAGE ANNUAL TOTAL RETURNS
For Periods Ended December 31, 2017

Average Annual Total Returns - Flexible Income Fund	Past 1 Year	Since Inception	Inception Date
Fund Shares	7.24%	3.15%	Jul. 12, 2013
Fund Shares | Return After Taxes on Distributions	5.54%	1.09%
Fund Shares | Return After Taxes on Distributions and Sale of Fund Shares	4.23%	1.50%
Inst. Shares	7.29%	3.31%	Jul. 12, 2013
Adviser Shares	7.00%	2.90%	Jul. 12, 2013
Bloomberg Barclays U.S. Universal Index (reflects no deduction for fees, expenses, or taxes)	4.09%	3.36%	Jul. 12, 2013

[1] The Total Annual Fund Operating Expenses for the Fund Shares, Institutional Shares, and Adviser Shares may not correlate to the ratio of expenses to average daily net assets shown in the financial highlights, which reflect the operating expenses of the Fund Shares, Institutional Shares, and Adviser Shares and do not include Acquired Fund Fees and Expenses.

[2] The Investment Adviser has agreed, through April 30, 2019, to make payments or waive management, administration, and other fees to limit the expenses of the Fund Shares, Institutional Shares, and Adviser Shares of the Fund so that the Total Annual Fund Operating Expenses (exclusive of commission recapture, expense offset arrangements, acquired fund fees and expenses, and extraordinary expenses) do not exceed an annual rate of 0.90%, 0.80%, and 1.15% of the Fund Shares, Institutional Shares, and Adviser Shares, respectively. This reimbursement arrangement may not be changed or terminated during this time period without approval of the Fund's Board of Trustees and may be changed or terminated by the Investment Adviser at any time after April 30, 2019.

XML

Label

Element

Value

Risk/Return:

rr_RiskReturnAbstract

Registrant Name

dei_EntityRegistrantName

USAA MUTUAL FUNDS TRUST

Prospectus Date

rr_ProspectusDate

May 01, 2018

Flexible Income Fund

Risk/Return:

rr_RiskReturnAbstract

Risk/Return [Heading]

rr_RiskReturnHeading

USAA Flexible Income Fund Summary

Objective [Heading]

rr_ObjectiveHeading

Investment Objective

Objective, Primary [Text Block]

rr_ObjectivePrimaryTextBlock

The USAA Flexible Income Fund (the Fund) seeks total return through a combination of income and capital appreciation.

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. The annual fund operating expenses for the Fund Shares, Institutional Shares, and Adviser Shares are based on expenses incurred during the Fund's most recently completed fiscal year.

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)

Fee Waiver or Reimbursement over Assets, Date of Termination

rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination

April 30, 2019

Portfolio Turnover [Heading]

rr_PortfolioTurnoverHeading

Portfolio Turnover

Portfolio Turnover [Text Block]

rr_PortfolioTurnoverTextBlock

The Fund pays transaction costs, including 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 shares of the Fund are held in a taxable account. These costs, which are not reflected in the Annual Fund Operating Expenses or in the Example, affect the Fund's performance.

For the most recent fiscal year, the Fund's portfolio turnover rate was 25% of the average value of its whole portfolio.

Portfolio Turnover, Rate

rr_PortfolioTurnoverRate

25.00%

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 this Fund with the cost of investing in other mutual funds. Although your actual costs may be higher or lower, you would pay the following expenses on a $10,000 investment, assuming (1) a 5% annual return, (2) the Fund's operating expenses remain the same, (3) you redeem all of your shares at the end of the periods shown, and (4) the expense reimbursement arrangement for the Fund Shares, Institutional Shares, and Adviser Shares is not continued beyond one year.

Strategy [Heading]

rr_StrategyHeading

Principal Investment Strategy

Strategy Narrative [Text Block]

rr_StrategyNarrativeTextBlock

Under normal market conditions, the Fund will invest in income-producing securities that carry the most attractive opportunity for total return, regardless of maturity or credit rating. The Fund may invest to a significant extent in investment-grade U.S. bonds, high-yield bonds (commonly referred to as "junk" bonds), bank loans, non-dollar-denominated bonds, and equity securities. In addition, the Fund may invest up to 40% of its assets in foreign non-dollar-denominated securities traded outside the United States, and may invest without limitation in dollar-denominated securities of foreign issuers. Investments in the securities of foreign issuers may include securities issued in emerging markets as well as securities issued in established markets. The Fund also may use various techniques, including, among others, entering into derivatives transactions (such as futures and options), currency exchange contracts, and swap agreements, to increase or decrease its exposure to changing security prices, interest rates, commodity prices, or other factors that affect security values.

For the purposes of this Fund, "bonds" may include corporate debt securities; obligations of U.S., state, and local governments, their agencies and instrumentalities; and mortgage- and asset-backed securities. For the purposes of this Fund, "equity securities" may include common stock, preferred stock, trust or limited partnership interests, rights and warrants to subscribe to or purchase such securities, sponsored or unsponsored American depositary receipts (ADRs), European depositary receipts (EDRs), global depositary receipts (GDRs), exchange-traded funds (ETFs), and convertible securities.

Risk [Heading]

rr_RiskHeading

Principal Risks

Risk Narrative [Text Block]

rr_RiskNarrativeTextBlock

Any investment involves risk, and there is no assurance that the Fund's objective will be achieved. The Fund is actively managed and the investment techniques and risk analyses used by the Fund's manager(s) may not produce the desired results. As you consider an investment in the Fund, you also should take into account your tolerance for the daily fluctuations of the financial markets and whether you can afford to leave your money in the Fund for long periods of time to ride out down periods. As with other mutual funds, losing money is a risk of investing in the Fund.

The equity securities in the Fund's portfolio are subject to stock market risk. A company's stock price in general may decline over short or even extended periods, regardless of the success or failure of the company's operations. Stock markets tend to run in cycles, with periods when stock prices generally go up and periods when stock prices generally go down. Equity securities tend to be more volatile than debt securities. In addition, to the degree the Fund invests in foreign securities, there is a possibility that the value of the Fund's investments in foreign securities will decrease because of unique risks, such as currency exchange-rate fluctuations; foreign market illiquidity; emerging-market risk; increased price volatility; uncertain political conditions; exchange control regulations; foreign ownership limits; different accounting, reporting, and disclosure requirements; difficulties in obtaining legal judgments; and foreign withholding taxes. These risks may be heightened to the extent the Fund invests in emerging-market countries. Emerging-market countries are less economically diverse and less mature than more developed countries and tend to be less politically stable.

The fixed-income securities 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. Fixed-income securities rated below investment grade, also known as "junk" or high-yield bonds, generally entail greater economic, credit, and liquidity risk than investment-grade securities. Their prices may be more volatile, especially during economic downturns, financial setbacks, or liquidity events.

The Fund is subject to the risk that the market value of the bonds in its portfolio will fluctuate because of changes in interest rates, changes in the supply of and demand for fixed-income securities, and other market factors. Bond prices generally are linked to the prevailing market interest rates. In general, when interest rates rise, bond prices fall; and conversely, when interest rates fall, bond prices rise. The price volatility of a bond also depends on its maturity. Generally, the longer the maturity of a bond, the greater is its sensitivity to interest rates. To compensate investors for this higher interest rate risk, bonds with longer maturities generally offer higher yields than bonds with shorter maturities. The Fund may be subject to a greater risk of rising interest rates due to the current period of historically low rates. The ability of an issuer of a debt security to repay principal prior to a security's maturity can increase the security's sensitivity to interest rate changes.

The Fund may invest in futures, options, and other types of derivatives. Risks associated with derivatives include the risk that the derivative is not well-correlated with the security, index, ETF, or currency to which it relates; the risk that the use of derivatives may not have the intended effects and may result in losses, underperformance, or missed opportunities; the risk that the Fund will be unable to sell the derivative because of an illiquid secondary market; the risk that a counterparty is unwilling or unable to meet its obligation; the risk of interest rate movements; and the risk that the derivatives transaction could expose the Fund to the effects of leverage, which could increase the Fund's market exposure, magnify investment risks and losses, and cause losses to be realized more quickly. There is no guarantee that derivative techniques will be employed or that they will work as intended, and their use could lower returns or even result in losses to the Fund.

The Fund is subject to legislative risk, which is the risk that changes in government policies may affect the value of the investments held by the Fund in ways we cannot anticipate, and that such policies could have an adverse impact on the value of the Fund's investments and the Fund's net asset value (NAV).

The risk of investing in securities that generally are less liquid than higher-quality securities is referred to as liquidity risk. The market for lower-quality issues generally is less liquid than the market for higher-quality issues. Therefore, large purchases or sales could cause sudden and significant price changes in these securities. Many lower-quality issues do not trade frequently; however, when they do trade, the trade price may be substantially higher or lower than expected.

The Fund is subject to prepayment and extension risk. The Fund can invest in mortgage-backed securities. These securities make regularly scheduled payments of principal along with interest payments. In addition, mortgagors generally have the option of paying off their mortgages without penalty at any time. For example, when a mortgaged property is sold, the old mortgage is usually prepaid. Also, when interest rates fall, the mortgagor may refinance the mortgage and prepay the old mortgage. A homeowner's default on the mortgage also may cause a prepayment of the mortgage. This unpredictability of the mortgage's cash flow is called prepayment risk. For the investor, prepayment risk usually means that principal is received at the least opportune time. For example, when interest rates fall, homeowners may find it advantageous to refinance their mortgages and prepay principal. In this case, the investor is forced to reinvest the principal at the current lower rate. On the other hand, when interest rates rise, homeowners generally will not refinance their mortgages and prepayments will fall. This causes the average life of the mortgage to extend and be more sensitive to interest rates, which sometimes is called extension risk. In addition, the amount of principal the investor has to invest in these higher interest rates is reduced.

An investment in the Fund is not a deposit in USAA Federal Savings Bank, or any other bank, and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.

Risk Lose Money [Text]

rr_RiskLoseMoney

As with other mutual funds, losing money is a risk of investing in the Fund.

Risk Not Insured Depository Institution [Text]

rr_RiskNotInsuredDepositoryInstitution

An investment in the Fund is not a deposit in USAA Federal Savings Bank, or any other bank, and is not insured or guaranteed by the Federal Deposit Insurance Corporation 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 Fund has three classes of shares: Fund Shares, Institutional Shares, and Adviser Shares. The bar chart provides some indication of the risks of investing in the Fund and illustrates the Fund Shares class's volatility and performance from year to year for each full calendar year since the Fund's inception. The table shows how the average annual total returns of the share classes for the periods indicated compared to those of the Fund's benchmark index. Performance reflects any expense limitations in effect during the periods shown.

Remember, historical performance (before and after taxes) does not necessarily indicate what will happen in the future. For the Fund's most current performance information, log on to usaa.com or call (800) 531-USAA (8722) or (210) 531-8722.

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 Shares class's volatility and performance from year to year for each full calendar year since the Fund's inception. The table shows how the average annual total returns of the share classes for the periods indicated compared to those of the Fund's benchmark index.

Performance Availability Phone [Text]

rr_PerformanceAvailabilityPhone

(800) 531-USAA (8722) or (210) 531-8722

Performance Availability Website Address [Text]

rr_PerformanceAvailabilityWebSiteAddress

usaa.com

Performance Past Does Not Indicate Future [Text]

rr_PerformancePastDoesNotIndicateFuture

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

During the periods shown in the chart:	Returns	Quarter ended
Highest Quarter Return	7.90%	June 30, 2016
Lowest Quarter Return	-4.30%	December 31, 2016
Year-to-Date Return	-3.91%	March 31, 2018

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. In certain situations, the return after taxes on distributions and sale of fund shares may be higher than the other return amounts. A higher after-tax return may result when a capital loss occurs upon redemption and translates into an assumed tax deduction that benefits the shareholder. The actual after-tax returns depend on your tax situation and may differ from those shown. If you hold your shares through a tax-deferred arrangement, such as an individual retirement account (IRA) or 401(k) plan, the after-tax returns shown in the table are not relevant to you. Please note that after-tax returns are only shown for the Fund Shares and may differ for each share class.

Performance Table Heading

rr_PerformanceTableHeading

AVERAGE ANNUAL TOTAL RETURNS
For Periods Ended December 31, 2017

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.

Performance Table Not Relevant to Tax Deferred

rr_PerformanceTableNotRelevantToTaxDeferred

If you hold your shares through a tax-deferred arrangement, such as an individual retirement account (IRA) or 401(k) plan, the after-tax returns shown in the table are not relevant to you.

Performance Table One Class of after Tax Shown [Text]

rr_PerformanceTableOneClassOfAfterTaxShown

Please note that after-tax returns are only shown for the Fund Shares and may differ for each share class.

Performance Table Explanation after Tax Higher

rr_PerformanceTableExplanationAfterTaxHigher

In certain situations, the return after taxes on distributions and sale of fund shares may be higher than the other return amounts. A higher after-tax return may result when a capital loss occurs upon redemption and translates into an assumed tax deduction that benefits the shareholder.

Flexible Income Fund | Fund Shares

Risk/Return:

rr_RiskReturnAbstract

Shareholder Fee, Other

rr_RedemptionFeeOverRedemption

none

Management Fee

rr_ManagementFeesOverAssets

0.50%

Distribution and/or Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

none

Other Expenses

rr_OtherExpensesOverAssets

0.67%

Acquired Fund Fees and Expenses

rr_AcquiredFundFeesAndExpensesOverAssets

0.05%

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

1.22%

^[1]

Reimbursement from Adviser

rr_FeeWaiverOrReimbursementOverAssets

(0.27%)

^[2]

Total Annual Fund Operating Expenses after Reimbursement

rr_NetExpensesOverAssets

0.95%

1 Year

rr_ExpenseExampleYear01

$ 97

3 Years

rr_ExpenseExampleYear03

360

5 Years

rr_ExpenseExampleYear05

644

10 Years

rr_ExpenseExampleYear10

$ 1,453

2014

rr_AnnualReturn2014

3.69%

2015

rr_AnnualReturn2015

(8.66%)

2016

rr_AnnualReturn2016

10.86%

2017

rr_AnnualReturn2017

7.24%

Year to Date Return, Label

rr_YearToDateReturnLabel

Year-to-Date Return

Bar Chart, Year to Date Return, Date

rr_BarChartYearToDateReturnDate

Mar. 31, 2018

Bar Chart, Year to Date Return

rr_BarChartYearToDateReturn

(3.91%)

Highest Quarterly Return, Label

rr_HighestQuarterlyReturnLabel

Highest Quarter Return

Highest Quarterly Return, Date

rr_BarChartHighestQuarterlyReturnDate

Jun. 30, 2016

Highest Quarterly Return

rr_BarChartHighestQuarterlyReturn

7.90%

Lowest Quarterly Return, Label

rr_LowestQuarterlyReturnLabel

Lowest Quarter Return

Lowest Quarterly Return, Date

rr_BarChartLowestQuarterlyReturnDate

Dec. 31, 2016

Lowest Quarterly Return

rr_BarChartLowestQuarterlyReturn

(4.30%)

Past 1 Year

rr_AverageAnnualReturnYear01

7.24%

Since Inception

rr_AverageAnnualReturnSinceInception

3.15%

Inception Date

rr_AverageAnnualReturnInceptionDate

Jul. 12, 2013

Flexible Income Fund | Inst. Shares

Risk/Return:

rr_RiskReturnAbstract

Shareholder Fee, Other

rr_RedemptionFeeOverRedemption

none

Management Fee

rr_ManagementFeesOverAssets

0.50%

Distribution and/or Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

none

Other Expenses

rr_OtherExpensesOverAssets

0.55%

Acquired Fund Fees and Expenses

rr_AcquiredFundFeesAndExpensesOverAssets

0.05%

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

1.10%

^[1]

Reimbursement from Adviser

rr_FeeWaiverOrReimbursementOverAssets

(0.25%)

^[2]

Total Annual Fund Operating Expenses after Reimbursement

rr_NetExpensesOverAssets

0.85%

1 Year

rr_ExpenseExampleYear01

$ 87

3 Years

rr_ExpenseExampleYear03

325

5 Years

rr_ExpenseExampleYear05

582

10 Years

rr_ExpenseExampleYear10

$ 1,318

Past 1 Year

rr_AverageAnnualReturnYear01

7.29%

Since Inception

rr_AverageAnnualReturnSinceInception

3.31%

Inception Date

rr_AverageAnnualReturnInceptionDate

Jul. 12, 2013

Flexible Income Fund | Adviser Shares

Risk/Return:

rr_RiskReturnAbstract

Shareholder Fee, Other

rr_RedemptionFeeOverRedemption

none

Management Fee

rr_ManagementFeesOverAssets

0.50%

Distribution and/or Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

0.25%

Other Expenses

rr_OtherExpensesOverAssets

0.81%

Acquired Fund Fees and Expenses

rr_AcquiredFundFeesAndExpensesOverAssets

0.05%

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

1.61%

^[1]

Reimbursement from Adviser

rr_FeeWaiverOrReimbursementOverAssets

(0.41%)

^[2]

Total Annual Fund Operating Expenses after Reimbursement

rr_NetExpensesOverAssets

1.20%

1 Year

rr_ExpenseExampleYear01

$ 122

3 Years

rr_ExpenseExampleYear03

468

5 Years

rr_ExpenseExampleYear05

837

10 Years

rr_ExpenseExampleYear10

$ 1,877

Past 1 Year

rr_AverageAnnualReturnYear01

7.00%

Since Inception

rr_AverageAnnualReturnSinceInception

2.90%

Inception Date

rr_AverageAnnualReturnInceptionDate

Jul. 12, 2013

Flexible Income Fund | Return After Taxes on Distributions | Fund Shares

Risk/Return:

rr_RiskReturnAbstract

Past 1 Year

rr_AverageAnnualReturnYear01

5.54%

Since Inception

rr_AverageAnnualReturnSinceInception

1.09%

Flexible Income Fund | Return After Taxes on Distributions and Sale of Fund Shares | Fund Shares

Risk/Return:

rr_RiskReturnAbstract

Past 1 Year

rr_AverageAnnualReturnYear01

4.23%

Since Inception

rr_AverageAnnualReturnSinceInception

1.50%

Flexible Income Fund | Bloomberg Barclays U.S. Universal Index (reflects no deduction for fees, expenses, or taxes)

Risk/Return:

rr_RiskReturnAbstract

Past 1 Year

rr_AverageAnnualReturnYear01

4.09%

Since Inception

rr_AverageAnnualReturnSinceInception

3.36%

Inception Date

rr_AverageAnnualReturnInceptionDate

Jul. 12, 2013

[1] The Total Annual Fund Operating Expenses for the Fund Shares, Institutional Shares, and Adviser Shares may not correlate to the ratio of expenses to average daily net assets shown in the financial highlights, which reflect the operating expenses of the Fund Shares, Institutional Shares, and Adviser Shares and do not include Acquired Fund Fees and Expenses.

[2] The Investment Adviser has agreed, through April 30, 2019, to make payments or waive management, administration, and other fees to limit the expenses of the Fund Shares, Institutional Shares, and Adviser Shares of the Fund so that the Total Annual Fund Operating Expenses (exclusive of commission recapture, expense offset arrangements, acquired fund fees and expenses, and extraordinary expenses) do not exceed an annual rate of 0.90%, 0.80%, and 1.15% of the Fund Shares, Institutional Shares, and Adviser Shares, respectively. This reimbursement arrangement may not be changed or terminated during this time period without approval of the Fund's Board of Trustees and may be changed or terminated by the Investment Adviser at any time after April 30, 2019.

XML

Extended Market Index Fund

USAA Extended Market Index Fund Summary

Investment Objective

The USAA Extended Market Index Fund (the Fund) seeks to match, before fees and expenses, the performance of all small- and mid-cap stocks as measured by the Dow Jones U.S. Completion Total Stock Market Index^SM (the "Index").¹

¹"Dow Jones," and "The Dow Jones U.S. Completion Total Stock Market Index^SM" are service marks of Dow Jones Trademark Holdings, LLC.

Fees and Expenses

The tables below describe the fees and expenses that you may pay, directly and indirectly, to invest in the Fund. The annual fund operating expenses for the Fund are based on expenses incurred during the Fund's most recently completed fiscal year.

Shareholder Fees

Shareholder Fees	Extended Market Index Fund None or same as Fund Name USD ($)
(fees paid directly from your investment)	none

Annual Fund Operating Expenses

(expenses that you pay each year as a percentage of the value of your investment)

Annual Fund Operating Expenses	Extended Market Index Fund None or same as Fund Name
Management Fee	0.10%
Distribution and/or Service (12b-1) Fees	none
Other Expenses	0.34%
Total Annual Fund Operating Expenses	0.44%	[1]

Example

This example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. Although your actual costs may be higher or lower, you would pay the following expenses on a $10,000 investment, assuming (1) a 5% annual return, (2) the Fund's operating expenses remain the same, and (3) you redeem all of your shares at the end of the periods shown.

Expense Example	1 Year	3 Years	5 Years	10 Years
Extended Market Index Fund | None or same as Fund Name | USD ($)	45	141	246	555

Portfolio Turnover

The Fund pays transaction costs, including 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 shares of the Fund are held in a taxable account. These costs, which are not reflected in the Annual Fund Operating Expenses or in the Example, affect the Fund's performance.

For the most recent fiscal year, the Fund's portfolio turnover rate was 11% of the average value of its whole portfolio.

Principal Investment Strategy

The Fund's principal investment strategy is, under normal market conditions, to invest at least 80% of its assets in securities or other financial instruments of companies that are components of, or have economic characteristics similar to, the securities included in the Index. This strategy may be changed upon 60 days' written notice to shareholders.

The Index is composed of all the equity securities that are issued by companies headquartered in the United States with their primary market listing in the United States, except those stocks included in the S&P 500.

In seeking to track the performance of the Index, the Fund uses the "sampling" method of indexing. Under this approach, the Fund selects a representative sample of stocks and/or derivatives that resemble the Index in terms of industry weightings, market capitalization, and other characteristics. It is not the Fund's intent to fully replicate the Index.

Principal Risks

Any investment involves risk, and there is no assurance that the Fund's objective will be achieved. As you consider an investment in the Fund, you also should take into account your tolerance for the daily fluctuations of the financial markets and whether you can afford to leave your money in the Fund for long periods of time to ride out down periods. As with other mutual funds, losing money is a risk of investing in the Fund.

The equity securities held in the Fund are subject to stock market risk. A company's stock price in general may decline over short or even extended periods, regardless of the success or failure of a company's operations. Stock markets tend to run in cycles, with periods when stock prices generally go up and periods when stock prices generally go down. Equity securities tend to be more volatile than debt securities.

The Fund invests in small- and mid-cap companies, which may be more vulnerable than larger companies to adverse business or economic conditions. Securities of small- and mid-cap companies may be less liquid and more volatile than securities of larger companies or the market in general and, therefore, may involve greater risk than investing in securities of larger companies.

The Fund may invest in futures, options, and other types of derivatives linked to the performance of the Index or other indices that are highly correlated with the Index. Risks associated with derivatives include the risk that the derivative is not well-correlated with the security, index, ETF, or currency to which it relates; the risk that derivatives used for risk management or to gain market exposure may not have the intended effects and may result in losses, underperformance, or missed opportunities; the risk that the Fund will be unable to sell the derivative because of an illiquid secondary market; the risk that a counterparty is unwilling or unable to meet its obligation; the risk of interest rate movements; and the risk that the derivatives transaction could expose the Fund to the effects of leverage, which could increase the Fund's market exposure, magnify investment risks and losses, and cause losses to be realized more quickly. There is no guarantee that derivative techniques will be employed or that they will work as intended, and their use could lower returns or even result in losses to the Fund.

While the Fund attempts to match the performance of the Index as closely as possible before the deduction of fees and expenses, the ability of the Fund to meet its investment objective depends to some extent on the cash flow in and out of the Fund and purchases and redemptions by other investors in the Fund. The Fund's performance may be affected by factors such as the size of the Fund's portfolio, transaction costs, management fees and expenses, and brokerage commissions and fees. Changes in the cash flow of the Fund may affect how closely the Fund tracks the Index.

An investment in the Fund is not a deposit in USAA Federal Savings Bank, or any other bank, and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.

Performance

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 and performance 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 compared to those of the Fund's benchmark index. Performance reflects any expense limitations in effect during the periods shown.

Remember, historical performance (before and after taxes) does not necessarily indicate what will happen in the future. For the Fund's most current performance information, log on to usaa.com or call (800) 531-USAA (8722) or (210) 531-8722.

RISK/RETURN BAR CHART
Annual Returns for Periods Ended December 31

During the periods shown in the chart:	Returns	Quarter ended
Highest Quarter Return	20.56%	June 30, 2009
Lowest Quarter Return	-26.43%	December 31, 2008
Year-to-Date Return	0.11%	March 31, 2018

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. In certain situations, the return after taxes on distributions and sale of fund shares may be higher than the other return amounts. A higher after-tax return may result when a capital loss occurs upon redemption and translates into an assumed tax deduction that benefits the shareholder. The actual after-tax returns depend on your tax situation and may differ from those shown. If you hold your shares through a tax-deferred arrangement, such as an individual retirement account (IRA) or 401(k) plan, the after-tax returns shown in the table are not relevant to you.

AVERAGE ANNUAL TOTAL RETURNS
For Periods Ended December 31, 2017

Average Annual Total Returns - Extended Market Index Fund	Past 1 Year	Past 5 Years	Past 10 Years
None or same as Fund Name	17.72%	13.99%	8.68%
None or same as Fund Name | Return After Taxes on Distributions	15.64%	12.30%	7.59%
None or same as Fund Name | Return After Taxes on Distributions and Sale of Fund Shares	11.53%	10.92%	6.87%
Dow Jones U.S. Completion Total Stock Market Index (reflects no deduction for fees, expenses, or taxes)	18.20%	14.25%	8.27%

[1] The expense information in the table has been restated to reflect current fees.

XML

Label

Element

Value

Risk/Return:

rr_RiskReturnAbstract

Registrant Name

dei_EntityRegistrantName

USAA MUTUAL FUNDS TRUST

Prospectus Date

rr_ProspectusDate

May 01, 2018

Extended Market Index Fund

Risk/Return:

rr_RiskReturnAbstract

Risk/Return [Heading]

rr_RiskReturnHeading

USAA Extended Market Index Fund Summary

Objective [Heading]

rr_ObjectiveHeading

Investment Objective

Objective, Primary [Text Block]

rr_ObjectivePrimaryTextBlock

The USAA Extended Market Index Fund (the Fund) seeks to match, before fees and expenses, the performance of all small- and mid-cap stocks as measured by the Dow Jones U.S. Completion Total Stock Market Index^SM (the "Index").¹

¹"Dow Jones," and "The Dow Jones U.S. Completion Total Stock Market Index^SM" are service marks of Dow Jones Trademark Holdings, LLC.

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. The annual fund operating expenses for the Fund are based on expenses incurred during the Fund's most recently completed fiscal year.

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)

Portfolio Turnover [Heading]

rr_PortfolioTurnoverHeading

Portfolio Turnover

Portfolio Turnover [Text Block]

rr_PortfolioTurnoverTextBlock

The Fund pays transaction costs, including 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 shares of the Fund are held in a taxable account. These costs, which are not reflected in the Annual Fund Operating Expenses or in the Example, affect the Fund's performance.

For the most recent fiscal year, the Fund's portfolio turnover rate was 11% of the average value of its whole portfolio.

Portfolio Turnover, Rate

rr_PortfolioTurnoverRate

11.00%

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. Although your actual costs may be higher or lower, you would pay the following expenses on a $10,000 investment, assuming (1) a 5% annual return, (2) the Fund's operating expenses remain the same, and (3) you redeem all of your shares at the end of the periods shown.

Strategy [Heading]

rr_StrategyHeading

Principal Investment Strategy

Strategy Narrative [Text Block]

rr_StrategyNarrativeTextBlock

The Fund's principal investment strategy is, under normal market conditions, to invest at least 80% of its assets in securities or other financial instruments of companies that are components of, or have economic characteristics similar to, the securities included in the Index. This strategy may be changed upon 60 days' written notice to shareholders.

The Index is composed of all the equity securities that are issued by companies headquartered in the United States with their primary market listing in the United States, except those stocks included in the S&P 500.

In seeking to track the performance of the Index, the Fund uses the "sampling" method of indexing. Under this approach, the Fund selects a representative sample of stocks and/or derivatives that resemble the Index in terms of industry weightings, market capitalization, and other characteristics. It is not the Fund's intent to fully replicate the Index.

Risk [Heading]

rr_RiskHeading

Principal Risks

Risk Narrative [Text Block]

rr_RiskNarrativeTextBlock

Any investment involves risk, and there is no assurance that the Fund's objective will be achieved. As you consider an investment in the Fund, you also should take into account your tolerance for the daily fluctuations of the financial markets and whether you can afford to leave your money in the Fund for long periods of time to ride out down periods. As with other mutual funds, losing money is a risk of investing in the Fund.

The equity securities held in the Fund are subject to stock market risk. A company's stock price in general may decline over short or even extended periods, regardless of the success or failure of a company's operations. Stock markets tend to run in cycles, with periods when stock prices generally go up and periods when stock prices generally go down. Equity securities tend to be more volatile than debt securities.

The Fund invests in small- and mid-cap companies, which may be more vulnerable than larger companies to adverse business or economic conditions. Securities of small- and mid-cap companies may be less liquid and more volatile than securities of larger companies or the market in general and, therefore, may involve greater risk than investing in securities of larger companies.

The Fund may invest in futures, options, and other types of derivatives linked to the performance of the Index or other indices that are highly correlated with the Index. Risks associated with derivatives include the risk that the derivative is not well-correlated with the security, index, ETF, or currency to which it relates; the risk that derivatives used for risk management or to gain market exposure may not have the intended effects and may result in losses, underperformance, or missed opportunities; the risk that the Fund will be unable to sell the derivative because of an illiquid secondary market; the risk that a counterparty is unwilling or unable to meet its obligation; the risk of interest rate movements; and the risk that the derivatives transaction could expose the Fund to the effects of leverage, which could increase the Fund's market exposure, magnify investment risks and losses, and cause losses to be realized more quickly. There is no guarantee that derivative techniques will be employed or that they will work as intended, and their use could lower returns or even result in losses to the Fund.

While the Fund attempts to match the performance of the Index as closely as possible before the deduction of fees and expenses, the ability of the Fund to meet its investment objective depends to some extent on the cash flow in and out of the Fund and purchases and redemptions by other investors in the Fund. The Fund's performance may be affected by factors such as the size of the Fund's portfolio, transaction costs, management fees and expenses, and brokerage commissions and fees. Changes in the cash flow of the Fund may affect how closely the Fund tracks the Index.

An investment in the Fund is not a deposit in USAA Federal Savings Bank, or any other bank, and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.

Risk Lose Money [Text]

rr_RiskLoseMoney

As with other mutual funds, losing money is a risk of investing in the Fund.

Risk Not Insured Depository Institution [Text]

rr_RiskNotInsuredDepositoryInstitution

An investment in the Fund is not a deposit in USAA Federal Savings Bank, or any other bank, and is not insured or guaranteed by the Federal Deposit Insurance Corporation 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 and performance 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 compared to those of the Fund's benchmark index. Performance reflects any expense limitations in effect during the periods shown.

Remember, historical performance (before and after taxes) does not necessarily indicate what will happen in the future. For the Fund's most current performance information, log on to usaa.com or call (800) 531-USAA (8722) or (210) 531-8722.

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 and performance 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 compared to those of the Fund's benchmark index.

Performance Availability Phone [Text]

rr_PerformanceAvailabilityPhone

(800) 531-USAA (8722) or (210) 531-8722

Performance Availability Website Address [Text]

rr_PerformanceAvailabilityWebSiteAddress

usaa.com

Performance Past Does Not Indicate Future [Text]

rr_PerformancePastDoesNotIndicateFuture

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

During the periods shown in the chart:	Returns	Quarter ended
Highest Quarter Return	20.56%	June 30, 2009
Lowest Quarter Return	-26.43%	December 31, 2008
Year-to-Date Return	0.11%	March 31, 2018

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. In certain situations, the return after taxes on distributions and sale of fund shares may be higher than the other return amounts. A higher after-tax return may result when a capital loss occurs upon redemption and translates into an assumed tax deduction that benefits the shareholder. The actual after-tax returns depend on your tax situation and may differ from those shown. If you hold your shares through a tax-deferred arrangement, such as an individual retirement account (IRA) or 401(k) plan, the after-tax returns shown in the table are not relevant to you.

Performance Table Heading

rr_PerformanceTableHeading

AVERAGE ANNUAL TOTAL RETURNS
For Periods Ended December 31, 2017

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.

Performance Table Not Relevant to Tax Deferred

rr_PerformanceTableNotRelevantToTaxDeferred

If you hold your shares through a tax-deferred arrangement, such as an individual retirement account (IRA) or 401(k) plan, the after-tax returns shown in the table are not relevant to you.

Performance Table Explanation after Tax Higher

rr_PerformanceTableExplanationAfterTaxHigher

In certain situations, the return after taxes on distributions and sale of fund shares may be higher than the other return amounts. A higher after-tax return may result when a capital loss occurs upon redemption and translates into an assumed tax deduction that benefits the shareholder.

Extended Market Index Fund | None or same as Fund Name

Risk/Return:

rr_RiskReturnAbstract

(fees paid directly from your investment)

rr_ShareholderFeeOther

none

Management Fee

rr_ManagementFeesOverAssets

0.10%

Distribution and/or Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

none

Other Expenses

rr_OtherExpensesOverAssets

0.34%

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

0.44%

^[1]

1 Year

rr_ExpenseExampleYear01

$ 45

3 Years

rr_ExpenseExampleYear03

141

5 Years

rr_ExpenseExampleYear05

246

10 Years

rr_ExpenseExampleYear10

$ 555

2008

rr_AnnualReturn2008

(39.35%)

2009

rr_AnnualReturn2009

36.37%

2010

rr_AnnualReturn2010

28.11%

2011

rr_AnnualReturn2011

(4.03%)

2012

rr_AnnualReturn2012

17.47%

2013

rr_AnnualReturn2013

37.26%

2014

rr_AnnualReturn2014

7.18%

2015

rr_AnnualReturn2015

(3.76%)

2016

rr_AnnualReturn2016

15.48%

2017

rr_AnnualReturn2017

17.72%

Year to Date Return, Label

rr_YearToDateReturnLabel

Year-to-Date Return

Bar Chart, Year to Date Return, Date

rr_BarChartYearToDateReturnDate

Mar. 31, 2018

Bar Chart, Year to Date Return

rr_BarChartYearToDateReturn

0.11%

Highest Quarterly Return, Label

rr_HighestQuarterlyReturnLabel

Highest Quarter Return

Highest Quarterly Return, Date

rr_BarChartHighestQuarterlyReturnDate

Jun. 30, 2009

Highest Quarterly Return

rr_BarChartHighestQuarterlyReturn

20.56%

Lowest Quarterly Return, Label

rr_LowestQuarterlyReturnLabel

Lowest Quarter Return

Lowest Quarterly Return, Date

rr_BarChartLowestQuarterlyReturnDate

Dec. 31, 2008

Lowest Quarterly Return

rr_BarChartLowestQuarterlyReturn

(26.43%)

Past 1 Year

rr_AverageAnnualReturnYear01

17.72%

Past 5 Years

rr_AverageAnnualReturnYear05

13.99%

Past 10 Years

rr_AverageAnnualReturnYear10

8.68%

Extended Market Index Fund | Return After Taxes on Distributions | None or same as Fund Name

Risk/Return:

rr_RiskReturnAbstract

Past 1 Year

rr_AverageAnnualReturnYear01

15.64%

Past 5 Years

rr_AverageAnnualReturnYear05

12.30%

Past 10 Years

rr_AverageAnnualReturnYear10

7.59%

Extended Market Index Fund | Return After Taxes on Distributions and Sale of Fund Shares | None or same as Fund Name

Risk/Return:

rr_RiskReturnAbstract

Past 1 Year

rr_AverageAnnualReturnYear01

11.53%

Past 5 Years

rr_AverageAnnualReturnYear05

10.92%

Past 10 Years

rr_AverageAnnualReturnYear10

6.87%

Extended Market Index Fund | Dow Jones U.S. Completion Total Stock Market Index (reflects no deduction for fees, expenses, or taxes)

Risk/Return:

rr_RiskReturnAbstract

Past 1 Year

rr_AverageAnnualReturnYear01

18.20%

Past 5 Years

rr_AverageAnnualReturnYear05

14.25%

Past 10 Years

rr_AverageAnnualReturnYear10

8.27%

[1] The expense information in the table has been restated to reflect current fees.

XML

Target Retirement Income Fund

USAA Target Retirement Income Fund Summary

Investment Objective

The USAA Target Retirement Income Fund (the Fund) provides capital appreciation and current income consistent with its current investment allocation.

Fees and Expenses

The tables below describe the fees and expenses that you may pay, directly and indirectly, to invest in the Fund. The annual fund operating expenses for the Fund are based on expenses incurred during the Fund's most recently completed fiscal year.

Shareholder Fees

Shareholder Fees	Target Retirement Income Fund None or same as Fund Name USD ($)
(fees paid directly from your investment)	none

Annual Fund Operating Expenses

(expenses that you pay each year as a percentage of the value of your investment)

Annual Fund Operating Expenses	Target Retirement Income Fund None or same as Fund Name
Management Fee	none
Distribution and/or Service (12b-1) Fees	none
Other Expenses	0.07%
Acquired Fund Fees and Expenses	0.61%
Total Annual Fund Operating Expenses	0.68%	[1]

Example

This example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. Although your actual costs may be higher or lower, you would pay the following expenses on a $10,000 investment, assuming (1) a 5% annual return, (2) the Fund's operating expenses remain the same, and (3) you redeem all of your shares at the end of the periods shown.

Expense Example	1 Year	3 Years	5 Years	10 Years
Target Retirement Income Fund | None or same as Fund Name | USD ($)	69	218	379	847

Portfolio Turnover

The Fund pays transaction costs, including 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 shares of the Fund are held in a taxable account. These costs, which are not reflected in the Annual Fund Operating Expenses or in the Example, affect the Fund's performance.

For the most recent fiscal year, the Fund's portfolio turnover rate was 41% of the average value of its whole portfolio.

Principal Investment Strategy

The Fund invests in a selection of USAA mutual funds and exchange-traded funds (ETFs) (underlying USAA Funds) in a manner consistent with its current asset allocation as depicted in the "lifestyle transition path."

The Fund's asset allocation strategy is based on the allocation at zero years left until retirement on the lifestyle transition path and is designed for investors who are currently in, or very close to retirement and who are planning to start withdrawing funds for retirement now or within the immediate future. In general, the Fund's allocation strategy assumes funds will start being withdrawn for retirement purposes at age 65. However, the Fund should not be selected solely on the basis of an investor's age. Because the Fund is designed for investors who are in or close to retirement, it is not anticipated that the Fund's current asset allocation will change based on the lifestyle transition plan. The Fund does not provide guaranteed income for retirement.

The Fund's current target asset allocation consists of: approximately 35% of the Fund's net assets allocated to underlying USAA Funds that invest primarily in equity securities or alternative asset classes (equity investments); and approximately 65% of the Fund's net assets allocated to underlying USAA Funds that invest primarily in fixed-income securities (fixed-income investments). The target asset allocation will not change unless approved by the Fund's Board of Trustees (Board).

Although the underlying USAA Funds are categorized generally as equity investments or fixed-income investments, many of these underlying USAA Funds invest in a mix of securities of domestic and foreign issuers, investment-grade and high-yield bonds, and other securities. As a result, the target asset allocation of the Fund may differ from the actual securities held by the underlying USAA Funds. Actual asset allocation also may differ from the lifestyle transition path as a result of market movement. The Fund's portfolio will be rebalanced on a regular basis, taking into account transaction costs. We may adjust the Fund's actual asset allocation from the targets specified in the lifestyle transition path based on market view or other conditions as part of an active asset allocation strategy, or make changes to the lifestyle transition path.

Principal Risks

Any investment involves risk, and there is no assurance that the Fund's objective will be achieved. The Fund is actively managed and the investment techniques and risk analyses used by the Fund's manager(s) may not produce the desired results. As you consider an investment in the Fund, you also should take into account your tolerance for the daily fluctuations of the financial markets and whether you can afford to leave your money in the Fund for long periods of time to ride out down periods. As with other mutual funds, losing money is a risk of investing in the Fund.

The risks of the Fund directly correspond to the risks of the underlying USAA Funds in which the Fund invests. By investing in the underlying USAA Funds, the Fund has exposure to the risk of many different areas of the market. The degree to which the risks described below apply to the Fund varies according to the Fund's asset allocation. For instance, the more the Fund is allocated to stock funds, the greater the risk associated with equity securities. The Fund also is subject to asset allocation risk (i.e., the risk that allocations will not produce the intended results) and to management risk (i.e., the risk that the selection of underlying USAA Funds will not produce the intended results).

In managing a Fund that invests in underlying USAA Funds, USAA Asset Management Company (Adviser) may be subject to potential conflicts of interest in allocating the Fund's assets among the various underlying USAA Funds. This is because the fees payable by some of the underlying USAA Funds to the Adviser and/or its affiliates are higher than the fees payable by other underlying USAA Funds and because the Adviser also is responsible for managing and administering the underlying USAA Funds.

The Fund may invest in underlying USAA Funds that invest in equity securities, which are subject to stock market risk. Stock prices in general may decline over short or even extended periods, regardless of the success or failure of a company's operations. Equity securities tend to be more volatile than bonds. In addition, to the degree an underlying USAA Fund invests in foreign securities, there is a possibility that the value of the Fund's investments in foreign securities will decrease because of unique risks, such as currency exchange-rate fluctuations; foreign market illiquidity; emerging-market risk; increased price volatility; uncertain political conditions; exchange control regulations; foreign ownership limits; different accounting, reporting, and disclosure requirements; difficulties in obtaining legal judgments; and foreign withholding taxes.

The Fund may invest in underlying USAA Funds that invest in bonds. There is a risk that the market value of those bonds will fluctuate because of changes in interest rates, changes in supply and demand for fixed-income securities, and other market factors. Bond prices generally are linked to prevailing market interest rates. In general, when interest rates rise, bond prices fall; and conversely, when interest rates fall, bond prices rise. The price volatility of a bond also depends on its maturity. Generally, the longer the maturity of a bond, the greater is its sensitivity to interest rates. To compensate investors for this higher interest rate risk, bonds with longer maturities generally offer higher yields than bonds with shorter maturities. The Fund may be subject to a greater risk of rising interest rates due to the current period of historically low rates. The ability of an issuer of a debt security to repay principal prior to a security's maturity can increase the security's sensitivity to interest rate changes.

The Fund may invest in underlying USAA Funds that invest in fixed-income securities that 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. Fixed-income securities rated below investment grade, also known as "junk" or high-yield bonds, generally entail greater economic, credit, and liquidity risk than investment-grade securities. Their prices may be more volatile, especially during economic downturns, financial setbacks, or liquidity events.

The Fund may invest in shares of ETFs, which generally are investment companies that hold a portfolio of common stocks or debt securities the shares of which are traded on an exchange. ETFs incur their own management and other fees and expenses, such as trustees' fees, operating expenses, registration fees, and marketing expenses, a proportionate share of which will be borne indirectly by the Fund. As a result, the Fund's investment in an ETF will cause the Fund to indirectly bear the fees and expenses of the ETF and, in turn, the Fund's performance may be lower than if the Fund were to invest directly in the securities held by the underlying ETFs. In addition, the Fund will be exposed indirectly to all of the risks associated with securities held by the ETFs.

An investment in the Fund is not a deposit in USAA Federal Savings Bank, or any other bank, and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.

Performance

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 and performance from year to year for each full calendar year since the Fund's inception. The table shows how the Fund's average annual total returns for the periods indicated compared to those of the Fund's benchmark index. Performance reflects any expense limitations in effect during the periods shown.

Remember, historical performance (before and after taxes) does not necessarily indicate what will happen in the future. For the Fund's most current performance information, log on to usaa.com or call (800) 531-USAA (8722) or (210) 531-8722.

RISK/RETURN BAR CHART
Annual Returns for Periods Ended December 31

During the periods shown in the chart:	Returns	Quarter ended
Highest Quarter Return	12.57%	June 30, 2009
Lowest Quarter Return	-5.07%	September 30, 2011
Year-to-Date Return	-1.09%	March 31, 2018

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. In certain situations, the return after taxes on distributions and sale of fund shares may be higher than the other return amounts. A higher after-tax return may result when a capital loss occurs upon redemption and translates into an assumed tax deduction that benefits the shareholder. The actual after-tax returns depend on your tax situation and may differ from those shown. If you hold your shares through a tax-deferred arrangement, such as an individual retirement account (IRA) or 401(k) plan, the after-tax returns shown in the table are not relevant to you.

AVERAGE ANNUAL TOTAL RETURNS
For Periods Ended December 31, 2017

Average Annual Total Returns - Target Retirement Income Fund	Past 1 Year	Past 5 Years	Since Inception	Inception Date
None or same as Fund Name	8.66%	4.34%	5.51%	Jul. 31, 2008
None or same as Fund Name | Return After Taxes on Distributions	6.73%	2.96%	4.25%
None or same as Fund Name | Return After Taxes on Distributions and Sale of Fund Shares	5.68%	2.89%	3.91%
S&P Target Date Retirement Income Index (reflects no deduction for fees, expenses, or taxes)	8.59%	4.87%	4.82%	Jul. 31, 2008

[1] The Total Annual Fund Operating Expenses for the Fund may not correlate to the ratio of expenses to average daily net assets shown in the financial highlights, which reflect the operating expenses of the Fund and do not include Acquired Fund Fees and Expenses.

XML

Label

Element

Value

Risk/Return:

rr_RiskReturnAbstract

Registrant Name

dei_EntityRegistrantName

USAA MUTUAL FUNDS TRUST

Prospectus Date

rr_ProspectusDate

May 01, 2018

Target Retirement Income Fund

Risk/Return:

rr_RiskReturnAbstract

Risk/Return [Heading]

rr_RiskReturnHeading

USAA Target Retirement Income Fund Summary

Objective [Heading]

rr_ObjectiveHeading

Investment Objective

Objective, Primary [Text Block]

rr_ObjectivePrimaryTextBlock

The USAA Target Retirement Income Fund (the Fund) provides capital appreciation and current income consistent with its current investment allocation.

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. The annual fund operating expenses for the Fund are based on expenses incurred during the Fund's most recently completed fiscal year.

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)

Portfolio Turnover [Heading]

rr_PortfolioTurnoverHeading

Portfolio Turnover

Portfolio Turnover [Text Block]

rr_PortfolioTurnoverTextBlock

The Fund pays transaction costs, including 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 shares of the Fund are held in a taxable account. These costs, which are not reflected in the Annual Fund Operating Expenses or in the Example, affect the Fund's performance.

For the most recent fiscal year, the Fund's portfolio turnover rate was 41% of the average value of its whole portfolio.

Portfolio Turnover, Rate

rr_PortfolioTurnoverRate

41.00%

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. Although your actual costs may be higher or lower, you would pay the following expenses on a $10,000 investment, assuming (1) a 5% annual return, (2) the Fund's operating expenses remain the same, and (3) you redeem all of your shares at the end of the periods shown.

Strategy [Heading]

rr_StrategyHeading

Principal Investment Strategy

Strategy Narrative [Text Block]

rr_StrategyNarrativeTextBlock

The Fund invests in a selection of USAA mutual funds and exchange-traded funds (ETFs) (underlying USAA Funds) in a manner consistent with its current asset allocation as depicted in the "lifestyle transition path."

The Fund's asset allocation strategy is based on the allocation at zero years left until retirement on the lifestyle transition path and is designed for investors who are currently in, or very close to retirement and who are planning to start withdrawing funds for retirement now or within the immediate future. In general, the Fund's allocation strategy assumes funds will start being withdrawn for retirement purposes at age 65. However, the Fund should not be selected solely on the basis of an investor's age. Because the Fund is designed for investors who are in or close to retirement, it is not anticipated that the Fund's current asset allocation will change based on the lifestyle transition plan. The Fund does not provide guaranteed income for retirement.

The Fund's current target asset allocation consists of: approximately 35% of the Fund's net assets allocated to underlying USAA Funds that invest primarily in equity securities or alternative asset classes (equity investments); and approximately 65% of the Fund's net assets allocated to underlying USAA Funds that invest primarily in fixed-income securities (fixed-income investments). The target asset allocation will not change unless approved by the Fund's Board of Trustees (Board).

Although the underlying USAA Funds are categorized generally as equity investments or fixed-income investments, many of these underlying USAA Funds invest in a mix of securities of domestic and foreign issuers, investment-grade and high-yield bonds, and other securities. As a result, the target asset allocation of the Fund may differ from the actual securities held by the underlying USAA Funds. Actual asset allocation also may differ from the lifestyle transition path as a result of market movement. The Fund's portfolio will be rebalanced on a regular basis, taking into account transaction costs. We may adjust the Fund's actual asset allocation from the targets specified in the lifestyle transition path based on market view or other conditions as part of an active asset allocation strategy, or make changes to the lifestyle transition path.

Risk [Heading]

rr_RiskHeading

Principal Risks

Risk Narrative [Text Block]

rr_RiskNarrativeTextBlock

Any investment involves risk, and there is no assurance that the Fund's objective will be achieved. The Fund is actively managed and the investment techniques and risk analyses used by the Fund's manager(s) may not produce the desired results. As you consider an investment in the Fund, you also should take into account your tolerance for the daily fluctuations of the financial markets and whether you can afford to leave your money in the Fund for long periods of time to ride out down periods. As with other mutual funds, losing money is a risk of investing in the Fund.

The risks of the Fund directly correspond to the risks of the underlying USAA Funds in which the Fund invests. By investing in the underlying USAA Funds, the Fund has exposure to the risk of many different areas of the market. The degree to which the risks described below apply to the Fund varies according to the Fund's asset allocation. For instance, the more the Fund is allocated to stock funds, the greater the risk associated with equity securities. The Fund also is subject to asset allocation risk (i.e., the risk that allocations will not produce the intended results) and to management risk (i.e., the risk that the selection of underlying USAA Funds will not produce the intended results).

In managing a Fund that invests in underlying USAA Funds, USAA Asset Management Company (Adviser) may be subject to potential conflicts of interest in allocating the Fund's assets among the various underlying USAA Funds. This is because the fees payable by some of the underlying USAA Funds to the Adviser and/or its affiliates are higher than the fees payable by other underlying USAA Funds and because the Adviser also is responsible for managing and administering the underlying USAA Funds.

The Fund may invest in underlying USAA Funds that invest in equity securities, which are subject to stock market risk. Stock prices in general may decline over short or even extended periods, regardless of the success or failure of a company's operations. Equity securities tend to be more volatile than bonds. In addition, to the degree an underlying USAA Fund invests in foreign securities, there is a possibility that the value of the Fund's investments in foreign securities will decrease because of unique risks, such as currency exchange-rate fluctuations; foreign market illiquidity; emerging-market risk; increased price volatility; uncertain political conditions; exchange control regulations; foreign ownership limits; different accounting, reporting, and disclosure requirements; difficulties in obtaining legal judgments; and foreign withholding taxes.

The Fund may invest in underlying USAA Funds that invest in bonds. There is a risk that the market value of those bonds will fluctuate because of changes in interest rates, changes in supply and demand for fixed-income securities, and other market factors. Bond prices generally are linked to prevailing market interest rates. In general, when interest rates rise, bond prices fall; and conversely, when interest rates fall, bond prices rise. The price volatility of a bond also depends on its maturity. Generally, the longer the maturity of a bond, the greater is its sensitivity to interest rates. To compensate investors for this higher interest rate risk, bonds with longer maturities generally offer higher yields than bonds with shorter maturities. The Fund may be subject to a greater risk of rising interest rates due to the current period of historically low rates. The ability of an issuer of a debt security to repay principal prior to a security's maturity can increase the security's sensitivity to interest rate changes.

The Fund may invest in underlying USAA Funds that invest in fixed-income securities that 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. Fixed-income securities rated below investment grade, also known as "junk" or high-yield bonds, generally entail greater economic, credit, and liquidity risk than investment-grade securities. Their prices may be more volatile, especially during economic downturns, financial setbacks, or liquidity events.

The Fund may invest in shares of ETFs, which generally are investment companies that hold a portfolio of common stocks or debt securities the shares of which are traded on an exchange. ETFs incur their own management and other fees and expenses, such as trustees' fees, operating expenses, registration fees, and marketing expenses, a proportionate share of which will be borne indirectly by the Fund. As a result, the Fund's investment in an ETF will cause the Fund to indirectly bear the fees and expenses of the ETF and, in turn, the Fund's performance may be lower than if the Fund were to invest directly in the securities held by the underlying ETFs. In addition, the Fund will be exposed indirectly to all of the risks associated with securities held by the ETFs.

An investment in the Fund is not a deposit in USAA Federal Savings Bank, or any other bank, and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.

Risk Lose Money [Text]

rr_RiskLoseMoney

As with other mutual funds, losing money is a risk of investing in the Fund.

Risk Not Insured Depository Institution [Text]

rr_RiskNotInsuredDepositoryInstitution

An investment in the Fund is not a deposit in USAA Federal Savings Bank, or any other bank, and is not insured or guaranteed by the Federal Deposit Insurance Corporation 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 and performance from year to year for each full calendar year since the Fund's inception. The table shows how the Fund's average annual total returns for the periods indicated compared to those of the Fund's benchmark index. Performance reflects any expense limitations in effect during the periods shown.

Remember, historical performance (before and after taxes) does not necessarily indicate what will happen in the future. For the Fund's most current performance information, log on to usaa.com or call (800) 531-USAA (8722) or (210) 531-8722.

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 and performance from year to year for each full calendar year since the Fund's inception. The table shows how the Fund's average annual total returns for the periods indicated compared to those of the Fund's benchmark index.

Performance Availability Phone [Text]

rr_PerformanceAvailabilityPhone

(800) 531-USAA (8722) or (210) 531-8722

Performance Availability Website Address [Text]

rr_PerformanceAvailabilityWebSiteAddress

usaa.com

Performance Past Does Not Indicate Future [Text]

rr_PerformancePastDoesNotIndicateFuture

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

During the periods shown in the chart:	Returns	Quarter ended
Highest Quarter Return	12.57%	June 30, 2009
Lowest Quarter Return	-5.07%	September 30, 2011
Year-to-Date Return	-1.09%	March 31, 2018

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. In certain situations, the return after taxes on distributions and sale of fund shares may be higher than the other return amounts. A higher after-tax return may result when a capital loss occurs upon redemption and translates into an assumed tax deduction that benefits the shareholder. The actual after-tax returns depend on your tax situation and may differ from those shown. If you hold your shares through a tax-deferred arrangement, such as an individual retirement account (IRA) or 401(k) plan, the after-tax returns shown in the table are not relevant to you.

Performance Table Heading

rr_PerformanceTableHeading

AVERAGE ANNUAL TOTAL RETURNS
For Periods Ended December 31, 2017

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.

Performance Table Not Relevant to Tax Deferred

rr_PerformanceTableNotRelevantToTaxDeferred

If you hold your shares through a tax-deferred arrangement, such as an individual retirement account (IRA) or 401(k) plan, the after-tax returns shown in the table are not relevant to you.

Performance Table Explanation after Tax Higher

rr_PerformanceTableExplanationAfterTaxHigher

In certain situations, the return after taxes on distributions and sale of fund shares may be higher than the other return amounts. A higher after-tax return may result when a capital loss occurs upon redemption and translates into an assumed tax deduction that benefits the shareholder.

Target Retirement Income Fund | None or same as Fund Name

Risk/Return:

rr_RiskReturnAbstract

(fees paid directly from your investment)

rr_ShareholderFeeOther

none

Management Fee

rr_ManagementFeesOverAssets

none

Distribution and/or Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

none

Other Expenses

rr_OtherExpensesOverAssets

0.07%

Acquired Fund Fees and Expenses

rr_AcquiredFundFeesAndExpensesOverAssets

0.61%

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

0.68%

^[1]

1 Year

rr_ExpenseExampleYear01

$ 69

3 Years

rr_ExpenseExampleYear03

218

5 Years

rr_ExpenseExampleYear05

379

10 Years

rr_ExpenseExampleYear10

$ 847

2009

rr_AnnualReturn2009

25.04%

2010

rr_AnnualReturn2010

11.65%

2011

rr_AnnualReturn2011

1.97%

2012

rr_AnnualReturn2012

9.49%

2013

rr_AnnualReturn2013

5.58%

2014

rr_AnnualReturn2014

3.36%

2015

rr_AnnualReturn2015

(1.95%)

2016

rr_AnnualReturn2016

6.36%

2017

rr_AnnualReturn2017

8.66%

Year to Date Return, Label

rr_YearToDateReturnLabel

Year-to-Date Return

Bar Chart, Year to Date Return, Date

rr_BarChartYearToDateReturnDate

Mar. 31, 2018

Bar Chart, Year to Date Return

rr_BarChartYearToDateReturn

(1.09%)

Highest Quarterly Return, Label

rr_HighestQuarterlyReturnLabel

Highest Quarter Return

Highest Quarterly Return, Date

rr_BarChartHighestQuarterlyReturnDate

Jun. 30, 2009

Highest Quarterly Return

rr_BarChartHighestQuarterlyReturn

12.57%

Lowest Quarterly Return, Label

rr_LowestQuarterlyReturnLabel

Lowest Quarter Return

Lowest Quarterly Return, Date

rr_BarChartLowestQuarterlyReturnDate

Sep. 30, 2011

Lowest Quarterly Return

rr_BarChartLowestQuarterlyReturn

(5.07%)

Past 1 Year

rr_AverageAnnualReturnYear01

8.66%

Past 5 Years

rr_AverageAnnualReturnYear05

4.34%

Since Inception

rr_AverageAnnualReturnSinceInception

5.51%

Inception Date

rr_AverageAnnualReturnInceptionDate

Jul. 31, 2008

Target Retirement Income Fund | Return After Taxes on Distributions | None or same as Fund Name

Risk/Return:

rr_RiskReturnAbstract

Past 1 Year

rr_AverageAnnualReturnYear01

6.73%

Past 5 Years

rr_AverageAnnualReturnYear05

2.96%

Since Inception

rr_AverageAnnualReturnSinceInception

4.25%

Target Retirement Income Fund | Return After Taxes on Distributions and Sale of Fund Shares | None or same as Fund Name

Risk/Return:

rr_RiskReturnAbstract

Past 1 Year

rr_AverageAnnualReturnYear01

5.68%

Past 5 Years

rr_AverageAnnualReturnYear05

2.89%

Since Inception

rr_AverageAnnualReturnSinceInception

3.91%

Target Retirement Income Fund | S&P Target Date Retirement Income Index (reflects no deduction for fees, expenses, or taxes)

Risk/Return:

rr_RiskReturnAbstract

Past 1 Year

rr_AverageAnnualReturnYear01

8.59%

Past 5 Years

rr_AverageAnnualReturnYear05

4.87%

Since Inception

rr_AverageAnnualReturnSinceInception

4.82%

Inception Date

rr_AverageAnnualReturnInceptionDate

Jul. 31, 2008

[1] The Total Annual Fund Operating Expenses for the Fund may not correlate to the ratio of expenses to average daily net assets shown in the financial highlights, which reflect the operating expenses of the Fund and do not include Acquired Fund Fees and Expenses.

XML

Target Retirement 2020 Fund

USAA Target Retirement 2020 Fund Summary

Investment Objective

The USAA Target Retirement 2020 Fund (the Fund) provides capital appreciation and current income consistent with its current investment allocation.

Fees and Expenses

The tables below describe the fees and expenses that you may pay, directly and indirectly, to invest in the Fund. The annual fund operating expenses for the Fund are based on expenses incurred during the Fund's most recently completed fiscal year.

Shareholder Fees

Shareholder Fees	Target Retirement 2020 Fund None or same as Fund Name USD ($)
(fees paid directly from your investment)	none

Annual Fund Operating Expenses

(expenses that you pay each year as a percentage of the value of your investment)

Annual Fund Operating Expenses	Target Retirement 2020 Fund None or same as Fund Name
Management Fee	none
Distribution and/or Service (12b-1) Fees	none
Other Expenses	0.04%
Acquired Fund Fees and Expenses	0.69%
Total Annual Fund Operating Expenses	0.73%	[1]

Example

This example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. Although your actual costs may be higher or lower, you would pay the following expenses on a $10,000 investment, assuming (1) a 5% annual return, (2) the Fund's operating expenses remain the same, and (3) you redeem all of your shares at the end of the periods shown.

Expense Example	1 Year	3 Years	5 Years	10 Years
Target Retirement 2020 Fund | None or same as Fund Name | USD ($)	75	233	406	906

Portfolio Turnover

The Fund pays transaction costs, including 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 shares of the Fund are held in a taxable account. These costs, which are not reflected in the Annual Fund Operating Expenses or in the Example, affect the Fund's performance.

For the most recent fiscal year, the Fund's portfolio turnover rate was 39% of the average value of its whole portfolio.

Principal Investment Strategy

The Fund invests in a selection of USAA mutual funds and exchange-traded funds (ETFs) (underlying USAA Funds) in a manner consistent with its current asset allocation as depicted in the "lifestyle transition path," based on the years left until retirement. The lifestyle transition path depicts how the asset allocation strategy shifts the Fund's assets among asset classes as the Fund becomes more conservative over time. The lifestyle transition path reflects the need for reduced investment risks and lower volatility as retirement approaches.

The Fund's asset allocation strategy is designed for investors planning to start withdrawing funds for retirement in or within a few years of the Fund's specific target date (2020). In general, the Fund's asset allocation strategy assumes funds will start being withdrawn for retirement purposes at age 65. However, the Fund should not be selected solely on the basis of an investor's age or the target date. The Fund does not provide guaranteed income for retirement.

Although the underlying USAA Funds are categorized generally as equity investments (equity securities or alternative asset classes) or fixed-income investments, many of these underlying USAA Funds invest in a mix of securities of domestic and foreign issuers, investment-grade and high-yield bonds, and other securities. As a result, the target asset allocation of the Fund may differ from the actual securities held by the underlying USAA Funds. Actual asset allocation also may differ from the lifestyle transition path as a result of market movement. The Fund's portfolio will be rebalanced on a regular basis, taking into account transaction costs. We may adjust the Fund's actual asset allocation from the targets specified in the lifestyle transition path based on market view or other conditions as part of an active asset allocation strategy, or make changes to the lifestyle transition path.

It is currently anticipated that at its target date, the Fund's target asset allocation will consist of approximately 35% of the Fund's net assets allocated to equity investments; and approximately 65% of the Fund's net assets allocated to fixed-income investments. The Fund's target asset allocation will not change after the target date has been reached unless approved by the Fund's Board of Trustees (Board).

Principal Risks

Any investment involves risk, and there is no assurance that the Fund's objective will be achieved. The Fund is actively managed and the investment techniques and risk analyses used by the Fund's manager(s) may not produce the desired results. As you consider an investment in the Fund, you also should take into account your tolerance for the daily fluctuations of the financial markets and whether you can afford to leave your money in the Fund for long periods of time to ride out down periods. As with other mutual funds, losing money is a risk of investing in the Fund.

The risks of the Fund directly correspond to the risks of the underlying USAA Funds in which the Fund invests. By investing in the underlying USAA Funds, the Fund has exposure to the risk of many different areas of the market. The degree to which the risks described below apply to the Fund varies according to the Fund's asset allocation. For instance, the more the Fund is allocated to stock funds, the greater the risk associated with equity securities. The Fund also is subject to asset allocation risk (i.e., the risk that allocations will not produce the intended results) and to management risk (i.e., the risk that the selection of underlying USAA Funds will not produce the intended results).

In managing a Fund that invests in underlying USAA Funds, USAA Asset Management Company (Adviser) may be subject to potential conflicts of interest in allocating the Fund's assets among the various underlying USAA Funds. This is because the fees payable by some of the underlying USAA Funds to the Adviser and/or its affiliates are higher than the fees payable by other underlying USAA Funds and because the Adviser also is responsible for managing and administering the underlying USAA Funds.

The Fund may invest in underlying USAA Funds that invest in equity securities, which are subject to stock market risk. Stock prices in general may decline over short or even extended periods, regardless of the success or failure of a company's operations. Equity securities tend to be more volatile than bonds. In addition, to the degree an underlying USAA Fund invests in foreign securities, there is a possibility that the value of the Fund's investments in foreign securities will decrease because of unique risks, such as currency exchange-rate fluctuations; foreign market illiquidity; emerging-market risk; increased price volatility; uncertain political conditions; exchange control regulations; foreign ownership limits; different accounting, reporting, and disclosure requirements; difficulties in obtaining legal judgments; and foreign withholding taxes.

The Fund may invest in underlying USAA Funds that invest in bonds. There is a risk that the market value of those bonds will fluctuate because of changes in interest rates, changes in supply and demand for fixed-income securities, and other market factors. Bond prices generally are linked to prevailing market interest rates. In general, when interest rates rise, bond prices fall; and conversely, when interest rates fall, bond prices rise. The price volatility of a bond also depends on its maturity. Generally, the longer the maturity of a bond, the greater is its sensitivity to interest rates. To compensate investors for this higher interest rate risk, bonds with longer maturities generally offer higher yields than bonds with shorter maturities. The Fund may be subject to a greater risk of rising interest rates due to the current period of historically low rates. The ability of an issuer of a debt security to repay principal prior to a security's maturity can increase the security's sensitivity to interest rate changes.

The Fund may invest in underlying USAA Funds that invest in fixed-income securities that 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. Fixed-income securities rated below investment grade, also known as "junk" or high-yield bonds, generally entail greater economic, credit, and liquidity risk than investment-grade securities. Their prices may be more volatile, especially during economic downturns, financial setbacks, or liquidity events.

The Fund may invest in shares of ETFs, which generally are investment companies that hold a portfolio of common stocks or debt securities the shares of which are traded on an exchange. ETFs incur their own management and other fees and expenses, such as trustees' fees, operating expenses, registration fees, and marketing expenses, a proportionate share of which will be borne indirectly by the Fund. As a result, the Fund's investment in an ETF will cause the Fund to indirectly bear the fees and expenses of the ETF and, in turn, the Fund's performance may be lower than if the Fund were to invest directly in the securities held by the underlying ETFs. In addition, the Fund will be exposed indirectly to all of the risks associated with securities held by the ETFs.

An investment in the Fund is not a deposit in USAA Federal Savings Bank, or any other bank, and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.

Performance

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 and performance from year to year for each full calendar year since the Fund's inception. The table shows how the Fund's average annual total returns for the periods indicated compared to those of the Fund's benchmark index. Performance reflects any expense limitations in effect during the periods shown.

Remember, historical performance (before and after taxes) does not necessarily indicate what will happen in the future. For the Fund's most current performance information, log on to usaa.com or call (800) 531-USAA (8722) or (210) 531-8722.

RISK/RETURN BAR CHART
Annual Returns for Periods Ended December 31

During the periods shown in the chart:	Returns	Quarter ended
Highest Quarter Return	15.40%	June 30, 2009
Lowest Quarter Return	-8.05%	September 30, 2011
Year-to-Date Return	-1.09%	March 31, 2018

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. In certain situations, the return after taxes on distributions and sale of fund shares may be higher than the other return amounts. A higher after-tax return may result when a capital loss occurs upon redemption and translates into an assumed tax deduction that benefits the shareholder. The actual after-tax returns depend on your tax situation and may differ from those shown. If you hold your shares through a tax-deferred arrangement, such as an individual retirement account (IRA) or 401(k) plan, the after-tax returns shown in the table are not relevant to you.

AVERAGE ANNUAL TOTAL RETURNS
For Periods Ended December 31, 2017

Average Annual Total Returns - Target Retirement 2020 Fund	Past 1 Year	Past 5 Years	Since Inception	Inception Date
None or same as Fund Name	12.71%	5.97%	6.71%	Jul. 31, 2008
None or same as Fund Name | Return After Taxes on Distributions	10.37%	4.58%	5.52%
None or same as Fund Name | Return After Taxes on Distributions and Sale of Fund Shares	8.35%	4.28%	5.01%
S&P Target Date 2020 Index (reflects no deduction for fees, expenses, or taxes)	12.88%	7.92%	6.52%	Jul. 31, 2008

[1] The Total Annual Fund Operating Expenses for the Fund may not correlate to the ratio of expenses to average daily net assets shown in the financial highlights, which reflect the operating expenses of the Fund and do not include Acquired Fund Fees and Expenses.

XML

Label

Element

Value

Risk/Return:

rr_RiskReturnAbstract

Registrant Name

dei_EntityRegistrantName

USAA MUTUAL FUNDS TRUST

Prospectus Date

rr_ProspectusDate

May 01, 2018

Target Retirement 2020 Fund

Risk/Return:

rr_RiskReturnAbstract

Risk/Return [Heading]

rr_RiskReturnHeading

USAA Target Retirement 2020 Fund Summary

Objective [Heading]

rr_ObjectiveHeading

Investment Objective

Objective, Primary [Text Block]

rr_ObjectivePrimaryTextBlock

The USAA Target Retirement 2020 Fund (the Fund) provides capital appreciation and current income consistent with its current investment allocation.

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. The annual fund operating expenses for the Fund are based on expenses incurred during the Fund's most recently completed fiscal year.

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)

Portfolio Turnover [Heading]

rr_PortfolioTurnoverHeading

Portfolio Turnover

Portfolio Turnover [Text Block]

rr_PortfolioTurnoverTextBlock

The Fund pays transaction costs, including 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 shares of the Fund are held in a taxable account. These costs, which are not reflected in the Annual Fund Operating Expenses or in the Example, affect the Fund's performance.

For the most recent fiscal year, the Fund's portfolio turnover rate was 39% of the average value of its whole portfolio.

Portfolio Turnover, Rate

rr_PortfolioTurnoverRate

39.00%

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. Although your actual costs may be higher or lower, you would pay the following expenses on a $10,000 investment, assuming (1) a 5% annual return, (2) the Fund's operating expenses remain the same, and (3) you redeem all of your shares at the end of the periods shown.

Strategy [Heading]

rr_StrategyHeading

Principal Investment Strategy

Strategy Narrative [Text Block]

rr_StrategyNarrativeTextBlock

The Fund invests in a selection of USAA mutual funds and exchange-traded funds (ETFs) (underlying USAA Funds) in a manner consistent with its current asset allocation as depicted in the "lifestyle transition path," based on the years left until retirement. The lifestyle transition path depicts how the asset allocation strategy shifts the Fund's assets among asset classes as the Fund becomes more conservative over time. The lifestyle transition path reflects the need for reduced investment risks and lower volatility as retirement approaches.

The Fund's asset allocation strategy is designed for investors planning to start withdrawing funds for retirement in or within a few years of the Fund's specific target date (2020). In general, the Fund's asset allocation strategy assumes funds will start being withdrawn for retirement purposes at age 65. However, the Fund should not be selected solely on the basis of an investor's age or the target date. The Fund does not provide guaranteed income for retirement.

Although the underlying USAA Funds are categorized generally as equity investments (equity securities or alternative asset classes) or fixed-income investments, many of these underlying USAA Funds invest in a mix of securities of domestic and foreign issuers, investment-grade and high-yield bonds, and other securities. As a result, the target asset allocation of the Fund may differ from the actual securities held by the underlying USAA Funds. Actual asset allocation also may differ from the lifestyle transition path as a result of market movement. The Fund's portfolio will be rebalanced on a regular basis, taking into account transaction costs. We may adjust the Fund's actual asset allocation from the targets specified in the lifestyle transition path based on market view or other conditions as part of an active asset allocation strategy, or make changes to the lifestyle transition path.

It is currently anticipated that at its target date, the Fund's target asset allocation will consist of approximately 35% of the Fund's net assets allocated to equity investments; and approximately 65% of the Fund's net assets allocated to fixed-income investments. The Fund's target asset allocation will not change after the target date has been reached unless approved by the Fund's Board of Trustees (Board).

Risk [Heading]

rr_RiskHeading

Principal Risks

Risk Narrative [Text Block]

rr_RiskNarrativeTextBlock

Any investment involves risk, and there is no assurance that the Fund's objective will be achieved. The Fund is actively managed and the investment techniques and risk analyses used by the Fund's manager(s) may not produce the desired results. As you consider an investment in the Fund, you also should take into account your tolerance for the daily fluctuations of the financial markets and whether you can afford to leave your money in the Fund for long periods of time to ride out down periods. As with other mutual funds, losing money is a risk of investing in the Fund.

The risks of the Fund directly correspond to the risks of the underlying USAA Funds in which the Fund invests. By investing in the underlying USAA Funds, the Fund has exposure to the risk of many different areas of the market. The degree to which the risks described below apply to the Fund varies according to the Fund's asset allocation. For instance, the more the Fund is allocated to stock funds, the greater the risk associated with equity securities. The Fund also is subject to asset allocation risk (i.e., the risk that allocations will not produce the intended results) and to management risk (i.e., the risk that the selection of underlying USAA Funds will not produce the intended results).

In managing a Fund that invests in underlying USAA Funds, USAA Asset Management Company (Adviser) may be subject to potential conflicts of interest in allocating the Fund's assets among the various underlying USAA Funds. This is because the fees payable by some of the underlying USAA Funds to the Adviser and/or its affiliates are higher than the fees payable by other underlying USAA Funds and because the Adviser also is responsible for managing and administering the underlying USAA Funds.

The Fund may invest in underlying USAA Funds that invest in equity securities, which are subject to stock market risk. Stock prices in general may decline over short or even extended periods, regardless of the success or failure of a company's operations. Equity securities tend to be more volatile than bonds. In addition, to the degree an underlying USAA Fund invests in foreign securities, there is a possibility that the value of the Fund's investments in foreign securities will decrease because of unique risks, such as currency exchange-rate fluctuations; foreign market illiquidity; emerging-market risk; increased price volatility; uncertain political conditions; exchange control regulations; foreign ownership limits; different accounting, reporting, and disclosure requirements; difficulties in obtaining legal judgments; and foreign withholding taxes.

The Fund may invest in underlying USAA Funds that invest in bonds. There is a risk that the market value of those bonds will fluctuate because of changes in interest rates, changes in supply and demand for fixed-income securities, and other market factors. Bond prices generally are linked to prevailing market interest rates. In general, when interest rates rise, bond prices fall; and conversely, when interest rates fall, bond prices rise. The price volatility of a bond also depends on its maturity. Generally, the longer the maturity of a bond, the greater is its sensitivity to interest rates. To compensate investors for this higher interest rate risk, bonds with longer maturities generally offer higher yields than bonds with shorter maturities. The Fund may be subject to a greater risk of rising interest rates due to the current period of historically low rates. The ability of an issuer of a debt security to repay principal prior to a security's maturity can increase the security's sensitivity to interest rate changes.

The Fund may invest in underlying USAA Funds that invest in fixed-income securities that 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. Fixed-income securities rated below investment grade, also known as "junk" or high-yield bonds, generally entail greater economic, credit, and liquidity risk than investment-grade securities. Their prices may be more volatile, especially during economic downturns, financial setbacks, or liquidity events.

The Fund may invest in shares of ETFs, which generally are investment companies that hold a portfolio of common stocks or debt securities the shares of which are traded on an exchange. ETFs incur their own management and other fees and expenses, such as trustees' fees, operating expenses, registration fees, and marketing expenses, a proportionate share of which will be borne indirectly by the Fund. As a result, the Fund's investment in an ETF will cause the Fund to indirectly bear the fees and expenses of the ETF and, in turn, the Fund's performance may be lower than if the Fund were to invest directly in the securities held by the underlying ETFs. In addition, the Fund will be exposed indirectly to all of the risks associated with securities held by the ETFs.

An investment in the Fund is not a deposit in USAA Federal Savings Bank, or any other bank, and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.

Risk Lose Money [Text]

rr_RiskLoseMoney

As with other mutual funds, losing money is a risk of investing in the Fund.

Risk Not Insured Depository Institution [Text]

rr_RiskNotInsuredDepositoryInstitution

An investment in the Fund is not a deposit in USAA Federal Savings Bank, or any other bank, and is not insured or guaranteed by the Federal Deposit Insurance Corporation 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 and performance from year to year for each full calendar year since the Fund's inception. The table shows how the Fund's average annual total returns for the periods indicated compared to those of the Fund's benchmark index. Performance reflects any expense limitations in effect during the periods shown.

Remember, historical performance (before and after taxes) does not necessarily indicate what will happen in the future. For the Fund's most current performance information, log on to usaa.com or call (800) 531-USAA (8722) or (210) 531-8722.

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 and performance from year to year for each full calendar year since the Fund's inception. The table shows how the Fund's average annual total returns for the periods indicated compared to those of the Fund's benchmark index.

Performance Availability Phone [Text]

rr_PerformanceAvailabilityPhone

(800) 531-USAA (8722) or (210) 531-8722

Performance Availability Website Address [Text]

rr_PerformanceAvailabilityWebSiteAddress

usaa.com

Performance Past Does Not Indicate Future [Text]

rr_PerformancePastDoesNotIndicateFuture

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

During the periods shown in the chart:	Returns	Quarter ended
Highest Quarter Return	15.40%	June 30, 2009
Lowest Quarter Return	-8.05%	September 30, 2011
Year-to-Date Return	-1.09%	March 31, 2018

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. In certain situations, the return after taxes on distributions and sale of fund shares may be higher than the other return amounts. A higher after-tax return may result when a capital loss occurs upon redemption and translates into an assumed tax deduction that benefits the shareholder. The actual after-tax returns depend on your tax situation and may differ from those shown. If you hold your shares through a tax-deferred arrangement, such as an individual retirement account (IRA) or 401(k) plan, the after-tax returns shown in the table are not relevant to you.

Performance Table Heading

rr_PerformanceTableHeading

AVERAGE ANNUAL TOTAL RETURNS
For Periods Ended December 31, 2017

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.

Performance Table Not Relevant to Tax Deferred

rr_PerformanceTableNotRelevantToTaxDeferred

If you hold your shares through a tax-deferred arrangement, such as an individual retirement account (IRA) or 401(k) plan, the after-tax returns shown in the table are not relevant to you.

Performance Table Explanation after Tax Higher

rr_PerformanceTableExplanationAfterTaxHigher

In certain situations, the return after taxes on distributions and sale of fund shares may be higher than the other return amounts. A higher after-tax return may result when a capital loss occurs upon redemption and translates into an assumed tax deduction that benefits the shareholder.

Target Retirement 2020 Fund | None or same as Fund Name

Risk/Return:

rr_RiskReturnAbstract

(fees paid directly from your investment)

rr_ShareholderFeeOther

none

Management Fee

rr_ManagementFeesOverAssets

none

Distribution and/or Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

none

Other Expenses

rr_OtherExpensesOverAssets

0.04%

Acquired Fund Fees and Expenses

rr_AcquiredFundFeesAndExpensesOverAssets

0.69%

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

0.73%

^[1]

1 Year

rr_ExpenseExampleYear01

$ 75

3 Years

rr_ExpenseExampleYear03

233

5 Years

rr_ExpenseExampleYear05

406

10 Years

rr_ExpenseExampleYear10

$ 906

2009

rr_AnnualReturn2009

28.12%

2010

rr_AnnualReturn2010

13.28%

2011

rr_AnnualReturn2011

0.52%

2012

rr_AnnualReturn2012

11.26%

2013

rr_AnnualReturn2013

9.16%

2014

rr_AnnualReturn2014

3.45%

2015

rr_AnnualReturn2015

(2.40%)

2016

rr_AnnualReturn2016

7.57%

2017

rr_AnnualReturn2017

12.71%

Year to Date Return, Label

rr_YearToDateReturnLabel

Year-to-Date Return

Bar Chart, Year to Date Return, Date

rr_BarChartYearToDateReturnDate

Mar. 31, 2018

Bar Chart, Year to Date Return

rr_BarChartYearToDateReturn

(1.09%)

Highest Quarterly Return, Label

rr_HighestQuarterlyReturnLabel

Highest Quarter Return

Highest Quarterly Return, Date

rr_BarChartHighestQuarterlyReturnDate

Jun. 30, 2009

Highest Quarterly Return

rr_BarChartHighestQuarterlyReturn

15.40%

Lowest Quarterly Return, Label

rr_LowestQuarterlyReturnLabel

Lowest Quarter Return

Lowest Quarterly Return, Date

rr_BarChartLowestQuarterlyReturnDate

Sep. 30, 2011

Lowest Quarterly Return

rr_BarChartLowestQuarterlyReturn

(8.05%)

Past 1 Year

rr_AverageAnnualReturnYear01

12.71%

Past 5 Years

rr_AverageAnnualReturnYear05

5.97%

Since Inception

rr_AverageAnnualReturnSinceInception

6.71%

Inception Date

rr_AverageAnnualReturnInceptionDate

Jul. 31, 2008

Target Retirement 2020 Fund | Return After Taxes on Distributions | None or same as Fund Name

Risk/Return:

rr_RiskReturnAbstract

Past 1 Year

rr_AverageAnnualReturnYear01

10.37%

Past 5 Years

rr_AverageAnnualReturnYear05

4.58%

Since Inception

rr_AverageAnnualReturnSinceInception

5.52%

Target Retirement 2020 Fund | Return After Taxes on Distributions and Sale of Fund Shares | None or same as Fund Name

Risk/Return:

rr_RiskReturnAbstract

Past 1 Year

rr_AverageAnnualReturnYear01

8.35%

Past 5 Years

rr_AverageAnnualReturnYear05

4.28%

Since Inception

rr_AverageAnnualReturnSinceInception

5.01%

Target Retirement 2020 Fund | S&P Target Date 2020 Index (reflects no deduction for fees, expenses, or taxes)

Risk/Return:

rr_RiskReturnAbstract

Past 1 Year

rr_AverageAnnualReturnYear01

12.88%

Past 5 Years

rr_AverageAnnualReturnYear05

7.92%

Since Inception

rr_AverageAnnualReturnSinceInception

6.52%

Inception Date

rr_AverageAnnualReturnInceptionDate

Jul. 31, 2008

[1] The Total Annual Fund Operating Expenses for the Fund may not correlate to the ratio of expenses to average daily net assets shown in the financial highlights, which reflect the operating expenses of the Fund and do not include Acquired Fund Fees and Expenses.

XML

Target Retirement 2030 Fund

USAA Target Retirement 2030 Fund Summary

Investment Objective

The USAA Target Retirement 2030 Fund (the Fund) provides capital appreciation and current income consistent with its current investment allocation.

Fees and Expenses

The tables below describe the fees and expenses that you may pay, directly and indirectly, to invest in the Fund. The annual fund operating expenses for the Fund are based on expenses incurred during the Fund's most recently completed fiscal year.

Shareholder Fees

Shareholder Fees	Target Retirement 2030 Fund None or same as Fund Name USD ($)
(fees paid directly from your investment)	none

Annual Fund Operating Expenses

(expenses that you pay each year as a percentage of the value of your investment)

Annual Fund Operating Expenses	Target Retirement 2030 Fund None or same as Fund Name
Management Fee	none
Distribution and/or Service (12b-1) Fees	none
Other Expenses	0.03%
Acquired Fund Fees and Expenses	0.75%
Total Annual Fund Operating Expenses	0.78%	[1]

Example

This example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. Although your actual costs may be higher or lower, you would pay the following expenses on a $10,000 investment, assuming (1) a 5% annual return, (2) the Fund's operating expenses remain the same, and (3) you redeem all of your shares at the end of the periods shown.

Expense Example	1 Year	3 Years	5 Years	10 Years
Target Retirement 2030 Fund | None or same as Fund Name | USD ($)	80	249	433	966

Portfolio Turnover

The Fund pays transaction costs, including 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 shares of the Fund are held in a taxable account. These costs, which are not reflected in the Annual Fund Operating Expenses or in the Example, affect the Fund's performance.

For the most recent fiscal year, the Fund's portfolio turnover rate was 32% of the average value of its whole portfolio.

Principal Investment Strategy

The Fund invests in a selection of USAA mutual funds and exchange-traded funds (ETFs) (underlying USAA Funds) in a manner consistent with its current asset allocation as depicted in the "lifestyle transition path," based on the years left until retirement. The lifestyle transition path depicts how the asset allocation strategy shifts the Fund's assets among asset classes as the Fund becomes more conservative over time. The lifestyle transition path reflects the need for reduced investment risks and lower volatility as retirement approaches.

The Fund's asset allocation strategy is designed for investors planning to start withdrawing funds for retirement in or within a few years of the Fund's specific target date (2030). In general, the Fund's asset allocation strategy assumes funds will start being withdrawn for retirement purposes at age 65. However, the Fund should not be selected solely on the basis of an investor's age or the target date. The Fund does not provide guaranteed income for retirement.

Although the underlying USAA Funds are categorized generally as equity investments (equity securities or alternative asset classes) or fixed-income investments, many of these underlying USAA Funds invest in a mix of securities of domestic and foreign issuers, investment-grade and high-yield bonds, and other securities. As a result, the target asset allocation of the Fund may differ from the actual securities held by the underlying USAA Funds. Actual asset allocation also may differ from the lifestyle transition path as a result of market movement. The Fund's portfolio will be rebalanced on a regular basis, taking into account transaction costs. We may adjust the Fund's actual asset allocation from the targets specified in the lifestyle transition path based on market view or other conditions as part of an active asset allocation strategy, or make changes to the lifestyle transition path.

It is currently anticipated that at its target date, the Fund's target asset allocation will consist of approximately 35% of the Fund's net assets allocated to equity investments; and approximately 65% of the Fund's net assets allocated to fixed-income investments. The Fund's target asset allocation will not change after the target date has been reached unless approved by the Fund's Board of Trustees (Board).

Principal Risks

Any investment involves risk, and there is no assurance that the Fund's objective will be achieved. The Fund is actively managed and the investment techniques and risk analyses used by the Fund's manager(s) may not produce the desired results. As you consider an investment in the Fund, you also should take into account your tolerance for the daily fluctuations of the financial markets and whether you can afford to leave your money in the Fund for long periods of time to ride out down periods. As with other mutual funds, losing money is a risk of investing in the Fund.

The risks of the Fund directly correspond to the risks of the underlying USAA Funds in which the Fund invests. By investing in the underlying USAA Funds, the Fund has exposure to the risk of many different areas of the market. The degree to which the risks described below apply to the Fund varies according to the Fund's asset allocation. For instance, the more the Fund is allocated to stock funds, the greater the risk associated with equity securities. The Fund also is subject to asset allocation risk (i.e., the risk that allocations will not produce the intended results) and to management risk (i.e., the risk that the selection of underlying USAA Funds will not produce the intended results).

In managing a Fund that invests in underlying USAA Funds, USAA Asset Management Company (Adviser) may be subject to potential conflicts of interest in allocating the Fund's assets among the various underlying USAA Funds. This is because the fees payable by some of the underlying USAA Funds to the Adviser and/or its affiliates are higher than the fees payable by other underlying USAA Funds and because the Adviser also is responsible for managing and administering the underlying USAA Funds.

The Fund may invest in underlying USAA Funds that invest in equity securities, which are subject to stock market risk. Stock prices in general may decline over short or even extended periods, regardless of the success or failure of a company's operations. Equity securities tend to be more volatile than bonds. In addition, to the degree an underlying USAA Fund invests in foreign securities, there is a possibility that the value of the Fund's investments in foreign securities will decrease because of unique risks, such as currency exchange-rate fluctuations; foreign market illiquidity; emerging-market risk; increased price volatility; uncertain political conditions; exchange control regulations; foreign ownership limits; different accounting, reporting, and disclosure requirements; difficulties in obtaining legal judgments; and foreign withholding taxes.

The Fund may invest in underlying USAA Funds that invest in bonds. There is a risk that the market value of those bonds will fluctuate because of changes in interest rates, changes in supply and demand for fixed-income securities, and other market factors. Bond prices generally are linked to prevailing market interest rates. In general, when interest rates rise, bond prices fall; and conversely, when interest rates fall, bond prices rise. The price volatility of a bond also depends on its maturity. Generally, the longer the maturity of a bond, the greater is its sensitivity to interest rates. To compensate investors for this higher interest rate risk, bonds with longer maturities generally offer higher yields than bonds with shorter maturities. The Fund may be subject to a greater risk of rising interest rates due to the current period of historically low rates. The ability of an issuer of a debt security to repay principal prior to a security's maturity can increase the security's sensitivity to interest rate changes.

The Fund may invest in underlying USAA Funds that invest in fixed-income securities that 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. Fixed-income securities rated below investment grade, also known as "junk" or high-yield bonds, generally entail greater economic, credit, and liquidity risk than investment-grade securities. Their prices may be more volatile, especially during economic downturns, financial setbacks, or liquidity events.

The Fund may invest in shares of ETFs, which generally are investment companies that hold a portfolio of common stocks or debt securities the shares of which are traded on an exchange. ETFs incur their own management and other fees and expenses, such as trustees' fees, operating expenses, registration fees, and marketing expenses, a proportionate share of which will be borne indirectly by the Fund. As a result, the Fund's investment in an ETF will cause the Fund to indirectly bear the fees and expenses of the ETF and, in turn, the Fund's performance may be lower than if the Fund were to invest directly in the securities held by the underlying ETFs. In addition, the Fund will be exposed indirectly to all of the risks associated with securities held by the ETFs.

An investment in the Fund is not a deposit in USAA Federal Savings Bank, or any other bank, and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.

Performance

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 and performance from year to year for each full calendar year since the Fund's inception. The table shows how the Fund's average annual total returns for the periods indicated compared to those of the Fund's benchmark index. Performance reflects any expense limitations in effect during the periods shown.

Remember, historical performance (before and after taxes) does not necessarily indicate what will happen in the future. For the Fund's most current performance information, log on to usaa.com or call (800) 531-USAA (8722) or (210) 531-8722.

RISK/RETURN BAR CHART
Annual Returns for Periods Ended December 31

During the periods shown in the chart:	Returns	Quarter ended
Highest Quarter Return	16.37%	June 30, 2009
Lowest Quarter Return	-11.49%	September 30, 2011
Year-to-Date Return	-1.16%	March 31, 2018

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. In certain situations, the return after taxes on distributions and sale of fund shares may be higher than the other return amounts. A higher after-tax return may result when a capital loss occurs upon redemption and translates into an assumed tax deduction that benefits the shareholder. The actual after-tax returns depend on your tax situation and may differ from those shown. If you hold your shares through a tax-deferred arrangement, such as an individual retirement account (IRA) or 401(k) plan, the after-tax returns shown in the table are not relevant to you.

AVERAGE ANNUAL TOTAL RETURNS
For Periods Ended December 31, 2017

Average Annual Total Returns - Target Retirement 2030 Fund	Past 1 Year	Past 5 Years	Since Inception	Inception Date
None or same as Fund Name	16.12%	7.61%	7.40%	Jul. 31, 2008
None or same as Fund Name | Return After Taxes on Distributions	13.69%	6.18%	6.29%
None or same as Fund Name | Return After Taxes on Distributions and Sale of Fund Shares	10.52%	5.58%	5.63%
S&P Target Date 2030 Index (reflects no deduction for fees, expenses, or taxes)	16.28%	9.58%	7.23%	Jul. 31, 2008

[1] The Total Annual Fund Operating Expenses for the Fund may not correlate to the ratio of expenses to average daily net assets shown in the financial highlights, which reflect the operating expenses of the Fund and do not include Acquired Fund Fees and Expenses.

XML

Label

Element

Value

Risk/Return:

rr_RiskReturnAbstract

Registrant Name

dei_EntityRegistrantName

USAA MUTUAL FUNDS TRUST

Prospectus Date

rr_ProspectusDate

May 01, 2018

Target Retirement 2030 Fund

Risk/Return:

rr_RiskReturnAbstract

Risk/Return [Heading]

rr_RiskReturnHeading

USAA Target Retirement 2030 Fund Summary

Objective [Heading]

rr_ObjectiveHeading

Investment Objective

Objective, Primary [Text Block]

rr_ObjectivePrimaryTextBlock

The USAA Target Retirement 2030 Fund (the Fund) provides capital appreciation and current income consistent with its current investment allocation.

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. The annual fund operating expenses for the Fund are based on expenses incurred during the Fund's most recently completed fiscal year.

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)

Portfolio Turnover [Heading]

rr_PortfolioTurnoverHeading

Portfolio Turnover

Portfolio Turnover [Text Block]

rr_PortfolioTurnoverTextBlock

The Fund pays transaction costs, including 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 shares of the Fund are held in a taxable account. These costs, which are not reflected in the Annual Fund Operating Expenses or in the Example, affect the Fund's performance.

For the most recent fiscal year, the Fund's portfolio turnover rate was 32% of the average value of its whole portfolio.

Portfolio Turnover, Rate

rr_PortfolioTurnoverRate

32.00%

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. Although your actual costs may be higher or lower, you would pay the following expenses on a $10,000 investment, assuming (1) a 5% annual return, (2) the Fund's operating expenses remain the same, and (3) you redeem all of your shares at the end of the periods shown.

Strategy [Heading]

rr_StrategyHeading

Principal Investment Strategy

Strategy Narrative [Text Block]

rr_StrategyNarrativeTextBlock

The Fund invests in a selection of USAA mutual funds and exchange-traded funds (ETFs) (underlying USAA Funds) in a manner consistent with its current asset allocation as depicted in the "lifestyle transition path," based on the years left until retirement. The lifestyle transition path depicts how the asset allocation strategy shifts the Fund's assets among asset classes as the Fund becomes more conservative over time. The lifestyle transition path reflects the need for reduced investment risks and lower volatility as retirement approaches.

The Fund's asset allocation strategy is designed for investors planning to start withdrawing funds for retirement in or within a few years of the Fund's specific target date (2030). In general, the Fund's asset allocation strategy assumes funds will start being withdrawn for retirement purposes at age 65. However, the Fund should not be selected solely on the basis of an investor's age or the target date. The Fund does not provide guaranteed income for retirement.

Although the underlying USAA Funds are categorized generally as equity investments (equity securities or alternative asset classes) or fixed-income investments, many of these underlying USAA Funds invest in a mix of securities of domestic and foreign issuers, investment-grade and high-yield bonds, and other securities. As a result, the target asset allocation of the Fund may differ from the actual securities held by the underlying USAA Funds. Actual asset allocation also may differ from the lifestyle transition path as a result of market movement. The Fund's portfolio will be rebalanced on a regular basis, taking into account transaction costs. We may adjust the Fund's actual asset allocation from the targets specified in the lifestyle transition path based on market view or other conditions as part of an active asset allocation strategy, or make changes to the lifestyle transition path.

It is currently anticipated that at its target date, the Fund's target asset allocation will consist of approximately 35% of the Fund's net assets allocated to equity investments; and approximately 65% of the Fund's net assets allocated to fixed-income investments. The Fund's target asset allocation will not change after the target date has been reached unless approved by the Fund's Board of Trustees (Board).

Risk [Heading]

rr_RiskHeading

Principal Risks

Risk Narrative [Text Block]

rr_RiskNarrativeTextBlock

Any investment involves risk, and there is no assurance that the Fund's objective will be achieved. The Fund is actively managed and the investment techniques and risk analyses used by the Fund's manager(s) may not produce the desired results. As you consider an investment in the Fund, you also should take into account your tolerance for the daily fluctuations of the financial markets and whether you can afford to leave your money in the Fund for long periods of time to ride out down periods. As with other mutual funds, losing money is a risk of investing in the Fund.

The risks of the Fund directly correspond to the risks of the underlying USAA Funds in which the Fund invests. By investing in the underlying USAA Funds, the Fund has exposure to the risk of many different areas of the market. The degree to which the risks described below apply to the Fund varies according to the Fund's asset allocation. For instance, the more the Fund is allocated to stock funds, the greater the risk associated with equity securities. The Fund also is subject to asset allocation risk (i.e., the risk that allocations will not produce the intended results) and to management risk (i.e., the risk that the selection of underlying USAA Funds will not produce the intended results).

In managing a Fund that invests in underlying USAA Funds, USAA Asset Management Company (Adviser) may be subject to potential conflicts of interest in allocating the Fund's assets among the various underlying USAA Funds. This is because the fees payable by some of the underlying USAA Funds to the Adviser and/or its affiliates are higher than the fees payable by other underlying USAA Funds and because the Adviser also is responsible for managing and administering the underlying USAA Funds.

The Fund may invest in underlying USAA Funds that invest in equity securities, which are subject to stock market risk. Stock prices in general may decline over short or even extended periods, regardless of the success or failure of a company's operations. Equity securities tend to be more volatile than bonds. In addition, to the degree an underlying USAA Fund invests in foreign securities, there is a possibility that the value of the Fund's investments in foreign securities will decrease because of unique risks, such as currency exchange-rate fluctuations; foreign market illiquidity; emerging-market risk; increased price volatility; uncertain political conditions; exchange control regulations; foreign ownership limits; different accounting, reporting, and disclosure requirements; difficulties in obtaining legal judgments; and foreign withholding taxes.

The Fund may invest in underlying USAA Funds that invest in bonds. There is a risk that the market value of those bonds will fluctuate because of changes in interest rates, changes in supply and demand for fixed-income securities, and other market factors. Bond prices generally are linked to prevailing market interest rates. In general, when interest rates rise, bond prices fall; and conversely, when interest rates fall, bond prices rise. The price volatility of a bond also depends on its maturity. Generally, the longer the maturity of a bond, the greater is its sensitivity to interest rates. To compensate investors for this higher interest rate risk, bonds with longer maturities generally offer higher yields than bonds with shorter maturities. The Fund may be subject to a greater risk of rising interest rates due to the current period of historically low rates. The ability of an issuer of a debt security to repay principal prior to a security's maturity can increase the security's sensitivity to interest rate changes.

The Fund may invest in underlying USAA Funds that invest in fixed-income securities that 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. Fixed-income securities rated below investment grade, also known as "junk" or high-yield bonds, generally entail greater economic, credit, and liquidity risk than investment-grade securities. Their prices may be more volatile, especially during economic downturns, financial setbacks, or liquidity events.

The Fund may invest in shares of ETFs, which generally are investment companies that hold a portfolio of common stocks or debt securities the shares of which are traded on an exchange. ETFs incur their own management and other fees and expenses, such as trustees' fees, operating expenses, registration fees, and marketing expenses, a proportionate share of which will be borne indirectly by the Fund. As a result, the Fund's investment in an ETF will cause the Fund to indirectly bear the fees and expenses of the ETF and, in turn, the Fund's performance may be lower than if the Fund were to invest directly in the securities held by the underlying ETFs. In addition, the Fund will be exposed indirectly to all of the risks associated with securities held by the ETFs.

An investment in the Fund is not a deposit in USAA Federal Savings Bank, or any other bank, and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.

Risk Lose Money [Text]

rr_RiskLoseMoney

As with other mutual funds, losing money is a risk of investing in the Fund.

Risk Not Insured Depository Institution [Text]

rr_RiskNotInsuredDepositoryInstitution

An investment in the Fund is not a deposit in USAA Federal Savings Bank, or any other bank, and is not insured or guaranteed by the Federal Deposit Insurance Corporation 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 and performance from year to year for each full calendar year since the Fund's inception. The table shows how the Fund's average annual total returns for the periods indicated compared to those of the Fund's benchmark index. Performance reflects any expense limitations in effect during the periods shown.

Remember, historical performance (before and after taxes) does not necessarily indicate what will happen in the future. For the Fund's most current performance information, log on to usaa.com or call (800) 531-USAA (8722) or (210) 531-8722.

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 and performance from year to year for each full calendar year since the Fund's inception. The table shows how the Fund's average annual total returns for the periods indicated compared to those of the Fund's benchmark index.

Performance Availability Phone [Text]

rr_PerformanceAvailabilityPhone

(800) 531-USAA (8722) or (210) 531-8722

Performance Availability Website Address [Text]

rr_PerformanceAvailabilityWebSiteAddress

usaa.com

Performance Past Does Not Indicate Future [Text]

rr_PerformancePastDoesNotIndicateFuture

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

During the periods shown in the chart:	Returns	Quarter ended
Highest Quarter Return	16.37%	June 30, 2009
Lowest Quarter Return	-11.49%	September 30, 2011
Year-to-Date Return	-1.16%	March 31, 2018

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. In certain situations, the return after taxes on distributions and sale of fund shares may be higher than the other return amounts. A higher after-tax return may result when a capital loss occurs upon redemption and translates into an assumed tax deduction that benefits the shareholder. The actual after-tax returns depend on your tax situation and may differ from those shown. If you hold your shares through a tax-deferred arrangement, such as an individual retirement account (IRA) or 401(k) plan, the after-tax returns shown in the table are not relevant to you.

Performance Table Heading

rr_PerformanceTableHeading

AVERAGE ANNUAL TOTAL RETURNS
For Periods Ended December 31, 2017

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.

Performance Table Not Relevant to Tax Deferred

rr_PerformanceTableNotRelevantToTaxDeferred

If you hold your shares through a tax-deferred arrangement, such as an individual retirement account (IRA) or 401(k) plan, the after-tax returns shown in the table are not relevant to you.

Performance Table Explanation after Tax Higher

rr_PerformanceTableExplanationAfterTaxHigher

In certain situations, the return after taxes on distributions and sale of fund shares may be higher than the other return amounts. A higher after-tax return may result when a capital loss occurs upon redemption and translates into an assumed tax deduction that benefits the shareholder.

Target Retirement 2030 Fund | None or same as Fund Name

Risk/Return:

rr_RiskReturnAbstract

(fees paid directly from your investment)

rr_ShareholderFeeOther

none

Management Fee

rr_ManagementFeesOverAssets

none

Distribution and/or Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

none

Other Expenses

rr_OtherExpensesOverAssets

0.03%

Acquired Fund Fees and Expenses

rr_AcquiredFundFeesAndExpensesOverAssets

0.75%

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

0.78%

^[1]

1 Year

rr_ExpenseExampleYear01

$ 80

3 Years

rr_ExpenseExampleYear03

249

5 Years

rr_ExpenseExampleYear05

433

10 Years

rr_ExpenseExampleYear10

$ 966

2009

rr_AnnualReturn2009

31.68%

2010

rr_AnnualReturn2010

15.34%

2011

rr_AnnualReturn2011

(1.16%)

2012

rr_AnnualReturn2012

13.16%

2013

rr_AnnualReturn2013

13.71%

2014

rr_AnnualReturn2014

3.43%

2015

rr_AnnualReturn2015

(2.81%)

2016

rr_AnnualReturn2016

8.70%

2017

rr_AnnualReturn2017

16.12%

Year to Date Return, Label

rr_YearToDateReturnLabel

Year-to-Date Return

Bar Chart, Year to Date Return, Date

rr_BarChartYearToDateReturnDate

Mar. 31, 2018

Bar Chart, Year to Date Return

rr_BarChartYearToDateReturn

(1.16%)

Highest Quarterly Return, Label

rr_HighestQuarterlyReturnLabel

Highest Quarter Return

Highest Quarterly Return, Date

rr_BarChartHighestQuarterlyReturnDate

Jun. 30, 2009

Highest Quarterly Return

rr_BarChartHighestQuarterlyReturn

16.37%

Lowest Quarterly Return, Label

rr_LowestQuarterlyReturnLabel

Lowest Quarter Return

Lowest Quarterly Return, Date

rr_BarChartLowestQuarterlyReturnDate

Sep. 30, 2011

Lowest Quarterly Return

rr_BarChartLowestQuarterlyReturn

(11.49%)

Past 1 Year

rr_AverageAnnualReturnYear01

16.12%

Past 5 Years

rr_AverageAnnualReturnYear05

7.61%

Since Inception

rr_AverageAnnualReturnSinceInception

7.40%

Inception Date

rr_AverageAnnualReturnInceptionDate

Jul. 31, 2008

Target Retirement 2030 Fund | Return After Taxes on Distributions | None or same as Fund Name

Risk/Return:

rr_RiskReturnAbstract

Past 1 Year

rr_AverageAnnualReturnYear01

13.69%

Past 5 Years

rr_AverageAnnualReturnYear05

6.18%

Since Inception

rr_AverageAnnualReturnSinceInception

6.29%

Target Retirement 2030 Fund | Return After Taxes on Distributions and Sale of Fund Shares | None or same as Fund Name

Risk/Return:

rr_RiskReturnAbstract

Past 1 Year

rr_AverageAnnualReturnYear01

10.52%

Past 5 Years

rr_AverageAnnualReturnYear05

5.58%

Since Inception

rr_AverageAnnualReturnSinceInception

5.63%

Target Retirement 2030 Fund | S&P Target Date 2030 Index (reflects no deduction for fees, expenses, or taxes)

Risk/Return:

rr_RiskReturnAbstract

Past 1 Year

rr_AverageAnnualReturnYear01

16.28%

Past 5 Years

rr_AverageAnnualReturnYear05

9.58%

Since Inception

rr_AverageAnnualReturnSinceInception

7.23%

Inception Date

rr_AverageAnnualReturnInceptionDate

Jul. 31, 2008

[1] The Total Annual Fund Operating Expenses for the Fund may not correlate to the ratio of expenses to average daily net assets shown in the financial highlights, which reflect the operating expenses of the Fund and do not include Acquired Fund Fees and Expenses.

XML

Target Retirement 2040 Fund

USAA Target Retirement 2040 Fund Summary

Investment Objective

The USAA Target Retirement 2040 Fund (the Fund) provides capital appreciation and current income consistent with its current investment allocation.

Fees and Expenses

The tables below describe the fees and expenses that you may pay, directly and indirectly, to invest in the Fund. The annual fund operating expenses for the Fund are based on expenses incurred during the Fund's most recently completed fiscal year.

Shareholder Fees

Shareholder Fees	Target Retirement 2040 Fund None or same as Fund Name USD ($)
(fees paid directly from your investment)	none

Annual Fund Operating Expenses

(expenses that you pay each year as a percentage of the value of your investment)

Annual Fund Operating Expenses	Target Retirement 2040 Fund None or same as Fund Name
Management Fee	none
Distribution and/or Service (12b-1) Fees	none
Other Expenses	0.03%
Acquired Fund Fees and Expenses	0.79%
Total Annual Fund Operating Expenses	0.82%	[1]

Example

This example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. Although your actual costs may be higher or lower, you would pay the following expenses on a $10,000 investment, assuming (1) a 5% annual return, (2) the Fund's operating expenses remain the same, and (3) you redeem all of your shares at the end of the periods shown.

Expense Example	1 Year	3 Years	5 Years	10 Years
Target Retirement 2040 Fund | None or same as Fund Name | USD ($)	84	262	455	1,014

Portfolio Turnover

The Fund pays transaction costs, including 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 shares of the Fund are held in a taxable account. These costs, which are not reflected in the Annual Fund Operating Expenses or in the Example, affect the Fund's performance.

For the most recent fiscal year, the Fund's portfolio turnover rate was 32% of the average value of its whole portfolio.

Principal Investment Strategy

The Fund invests in a selection of USAA mutual funds and exchange-traded funds (ETFs) (underlying USAA Funds) in a manner consistent with its current asset allocation as depicted in the "lifestyle transition path," based on the years left until retirement. The lifestyle transition path depicts how the asset allocation strategy shifts the Fund's assets among asset classes as the Fund becomes more conservative over time. The lifestyle transition path reflects the need for reduced investment risks and lower volatility as retirement approaches.

The Fund's asset allocation strategy is designed for investors planning to start withdrawing funds for retirement in or within a few years of the Fund's specific target date (2040). In general, the Fund's asset allocation strategy assumes funds will start being withdrawn for retirement purposes at age 65. However, the Fund should not be selected solely on the basis of an investor's age or the target date. The Fund does not provide guaranteed income for retirement.

Although the underlying USAA Funds are categorized generally as equity investments (equity securities or alternative asset classes) or fixed-income investments, many of these underlying USAA Funds invest in a mix of securities of domestic and foreign issuers, investment-grade and high-yield bonds, and other securities. As a result, the target asset allocation of the Fund may differ from the actual securities held by the underlying USAA Funds. Actual asset allocation also may differ from the lifestyle transition path as a result of market movement. The Fund's portfolio will be rebalanced on a regular basis, taking into account transaction costs. We may adjust the Fund's actual asset allocation from the targets specified in the lifestyle transition path based on market view or other conditions as part of an active asset allocation strategy, or make changes to the lifestyle transition path.

It is currently anticipated that at its target date, the Fund's target asset allocation will consist of approximately 35% of the Fund's net assets allocated to equity investments; and approximately 65% of the Fund's net assets allocated to fixed-income investments. The Fund's target asset allocation will not change after the target date has been reached unless approved by the Fund's Board of Trustees (Board).

Principal Risks

Any investment involves risk, and there is no assurance that the Fund's objective will be achieved. The Fund is actively managed and the investment techniques and risk analyses used by the Fund's manager(s) may not produce the desired results. As you consider an investment in the Fund, you also should take into account your tolerance for the daily fluctuations of the financial markets and whether you can afford to leave your money in the Fund for long periods of time to ride out down periods. As with other mutual funds, losing money is a risk of investing in the Fund.

The risks of the Fund directly correspond to the risks of the underlying USAA Funds in which the Fund invests. By investing in the underlying USAA Funds, the Fund has exposure to the risk of many different areas of the market. The degree to which the risks described below apply to the Fund varies according to the Fund's asset allocation. For instance, the more the Fund is allocated to stock funds, the greater the risk associated with equity securities. The Fund also is subject to asset allocation risk (i.e., the risk that allocations will not produce the intended results) and to management risk (i.e., the risk that the selection of underlying USAA Funds will not produce the intended results).

In managing a Fund that invests in underlying USAA Funds, USAA Asset Management Company (Adviser) may be subject to potential conflicts of interest in allocating the Fund's assets among the various underlying USAA Funds. This is because the fees payable by some of the underlying USAA Funds to the Adviser and/or its affiliates are higher than the fees payable by other underlying USAA Funds and because the Adviser also is responsible for managing and administering the underlying USAA Funds.

The Fund may invest in underlying USAA Funds that invest in equity securities, which are subject to stock market risk. Stock prices in general may decline over short or even extended periods, regardless of the success or failure of a company's operations. Equity securities tend to be more volatile than bonds. In addition, to the degree an underlying USAA Fund invests in foreign securities, there is a possibility that the value of the Fund's investments in foreign securities will decrease because of unique risks, such as currency exchange-rate fluctuations; foreign market illiquidity; emerging-market risk; increased price volatility; uncertain political conditions; exchange control regulations; foreign ownership limits; different accounting, reporting, and disclosure requirements; difficulties in obtaining legal judgments; and foreign withholding taxes.

The Fund may invest in underlying USAA Funds that invest in bonds. There is a risk that the market value of those bonds will fluctuate because of changes in interest rates, changes in supply and demand for fixed-income securities, and other market factors. Bond prices generally are linked to prevailing market interest rates. In general, when interest rates rise, bond prices fall; and conversely, when interest rates fall, bond prices rise. The price volatility of a bond also depends on its maturity. Generally, the longer the maturity of a bond, the greater is its sensitivity to interest rates. To compensate investors for this higher interest rate risk, bonds with longer maturities generally offer higher yields than bonds with shorter maturities. The Fund may be subject to a greater risk of rising interest rates due to the current period of historically low rates. The ability of an issuer of a debt security to repay principal prior to a security's maturity can increase the security's sensitivity to interest rate changes.

The Fund may invest in underlying USAA Funds that invest in fixed-income securities that 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. Fixed-income securities rated below investment grade, also known as "junk" or high-yield bonds, generally entail greater economic, credit, and liquidity risk than investment-grade securities. Their prices may be more volatile, especially during economic downturns, financial setbacks, or liquidity events.

The Fund may invest in shares of ETFs, which generally are investment companies that hold a portfolio of common stocks or debt securities the shares of which are traded on an exchange. ETFs incur their own management and other fees and expenses, such as trustees' fees, operating expenses, registration fees, and marketing expenses, a proportionate share of which will be borne indirectly by the Fund. As a result, the Fund's investment in an ETF will cause the Fund to indirectly bear the fees and expenses of the ETF and, in turn, the Fund's performance may be lower than if the Fund were to invest directly in the securities held by the underlying ETFs. In addition, the Fund will be exposed indirectly to all of the risks associated with securities held by the ETFs.

An investment in the Fund is not a deposit in USAA Federal Savings Bank, or any other bank, and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.

Performance

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 and performance from year to year for each full calendar year since the Fund's inception. The table shows how the Fund's average annual total returns for the periods indicated compared to those of the Fund's benchmark index. Performance reflects any expense limitations in effect during the periods shown.

Remember, historical performance (before and after taxes) does not necessarily indicate what will happen in the future. For the Fund's most current performance information, log on to usaa.com or call (800) 531-USAA (8722) or (210) 531-8722.

RISK/RETURN BAR CHART
Annual Returns for Periods Ended December 31

During the periods shown in the chart:	Returns	Quarter ended
Highest Quarter Return	16.50%	June 30, 2009
Lowest Quarter Return	-14.98%	September 30, 2011
Year-to-Date Return	-1.19%	March 31, 2018

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. In certain situations, the return after taxes on distributions and sale of fund shares may be higher than the other return amounts. A higher after-tax return may result when a capital loss occurs upon redemption and translates into an assumed tax deduction that benefits the shareholder. The actual after-tax returns depend on your tax situation and may differ from those shown. If you hold your shares through a tax-deferred arrangement, such as an individual retirement account (IRA) or 401(k) plan, the after-tax returns shown in the table are not relevant to you.

AVERAGE ANNUAL TOTAL RETURNS
For Periods Ended December 31, 2017

Average Annual Total Returns - Target Retirement 2040 Fund	Past 1 Year	Past 5 Years	Since Inception	Inception Date
None or same as Fund Name	18.46%	8.74%	7.28%	Jul. 31, 2008
None or same as Fund Name | Return After Taxes on Distributions	16.47%	7.42%	6.35%
None or same as Fund Name | Return After Taxes on Distributions and Sale of Fund Shares	11.64%	6.54%	5.62%
S&P Target Date 2040 Index (reflects no deduction for fees, expenses, or taxes)	18.98%	10.79%	7.73%	Jul. 31, 2008

[1] The Total Annual Fund Operating Expenses for the Fund may not correlate to the ratio of expenses to average daily net assets shown in the financial highlights, which reflect the operating expenses of the Fund and do not include Acquired Fund Fees and Expenses.

XML

Label

Element

Value

Risk/Return:

rr_RiskReturnAbstract

Registrant Name

dei_EntityRegistrantName

USAA MUTUAL FUNDS TRUST

Prospectus Date

rr_ProspectusDate

May 01, 2018

Target Retirement 2040 Fund

Risk/Return:

rr_RiskReturnAbstract

Risk/Return [Heading]

rr_RiskReturnHeading

USAA Target Retirement 2040 Fund Summary

Objective [Heading]

rr_ObjectiveHeading

Investment Objective

Objective, Primary [Text Block]

rr_ObjectivePrimaryTextBlock

The USAA Target Retirement 2040 Fund (the Fund) provides capital appreciation and current income consistent with its current investment allocation.

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. The annual fund operating expenses for the Fund are based on expenses incurred during the Fund's most recently completed fiscal year.

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)

Portfolio Turnover [Heading]

rr_PortfolioTurnoverHeading

Portfolio Turnover

Portfolio Turnover [Text Block]

rr_PortfolioTurnoverTextBlock

The Fund pays transaction costs, including 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 shares of the Fund are held in a taxable account. These costs, which are not reflected in the Annual Fund Operating Expenses or in the Example, affect the Fund's performance.

For the most recent fiscal year, the Fund's portfolio turnover rate was 32% of the average value of its whole portfolio.

Portfolio Turnover, Rate

rr_PortfolioTurnoverRate

32.00%

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. Although your actual costs may be higher or lower, you would pay the following expenses on a $10,000 investment, assuming (1) a 5% annual return, (2) the Fund's operating expenses remain the same, and (3) you redeem all of your shares at the end of the periods shown.

Strategy [Heading]

rr_StrategyHeading

Principal Investment Strategy

Strategy Narrative [Text Block]

rr_StrategyNarrativeTextBlock

The Fund invests in a selection of USAA mutual funds and exchange-traded funds (ETFs) (underlying USAA Funds) in a manner consistent with its current asset allocation as depicted in the "lifestyle transition path," based on the years left until retirement. The lifestyle transition path depicts how the asset allocation strategy shifts the Fund's assets among asset classes as the Fund becomes more conservative over time. The lifestyle transition path reflects the need for reduced investment risks and lower volatility as retirement approaches.

The Fund's asset allocation strategy is designed for investors planning to start withdrawing funds for retirement in or within a few years of the Fund's specific target date (2040). In general, the Fund's asset allocation strategy assumes funds will start being withdrawn for retirement purposes at age 65. However, the Fund should not be selected solely on the basis of an investor's age or the target date. The Fund does not provide guaranteed income for retirement.

Although the underlying USAA Funds are categorized generally as equity investments (equity securities or alternative asset classes) or fixed-income investments, many of these underlying USAA Funds invest in a mix of securities of domestic and foreign issuers, investment-grade and high-yield bonds, and other securities. As a result, the target asset allocation of the Fund may differ from the actual securities held by the underlying USAA Funds. Actual asset allocation also may differ from the lifestyle transition path as a result of market movement. The Fund's portfolio will be rebalanced on a regular basis, taking into account transaction costs. We may adjust the Fund's actual asset allocation from the targets specified in the lifestyle transition path based on market view or other conditions as part of an active asset allocation strategy, or make changes to the lifestyle transition path.

It is currently anticipated that at its target date, the Fund's target asset allocation will consist of approximately 35% of the Fund's net assets allocated to equity investments; and approximately 65% of the Fund's net assets allocated to fixed-income investments. The Fund's target asset allocation will not change after the target date has been reached unless approved by the Fund's Board of Trustees (Board).

Risk [Heading]

rr_RiskHeading

Principal Risks

Risk Narrative [Text Block]

rr_RiskNarrativeTextBlock

Any investment involves risk, and there is no assurance that the Fund's objective will be achieved. The Fund is actively managed and the investment techniques and risk analyses used by the Fund's manager(s) may not produce the desired results. As you consider an investment in the Fund, you also should take into account your tolerance for the daily fluctuations of the financial markets and whether you can afford to leave your money in the Fund for long periods of time to ride out down periods. As with other mutual funds, losing money is a risk of investing in the Fund.

The risks of the Fund directly correspond to the risks of the underlying USAA Funds in which the Fund invests. By investing in the underlying USAA Funds, the Fund has exposure to the risk of many different areas of the market. The degree to which the risks described below apply to the Fund varies according to the Fund's asset allocation. For instance, the more the Fund is allocated to stock funds, the greater the risk associated with equity securities. The Fund also is subject to asset allocation risk (i.e., the risk that allocations will not produce the intended results) and to management risk (i.e., the risk that the selection of underlying USAA Funds will not produce the intended results).

In managing a Fund that invests in underlying USAA Funds, USAA Asset Management Company (Adviser) may be subject to potential conflicts of interest in allocating the Fund's assets among the various underlying USAA Funds. This is because the fees payable by some of the underlying USAA Funds to the Adviser and/or its affiliates are higher than the fees payable by other underlying USAA Funds and because the Adviser also is responsible for managing and administering the underlying USAA Funds.

The Fund may invest in underlying USAA Funds that invest in equity securities, which are subject to stock market risk. Stock prices in general may decline over short or even extended periods, regardless of the success or failure of a company's operations. Equity securities tend to be more volatile than bonds. In addition, to the degree an underlying USAA Fund invests in foreign securities, there is a possibility that the value of the Fund's investments in foreign securities will decrease because of unique risks, such as currency exchange-rate fluctuations; foreign market illiquidity; emerging-market risk; increased price volatility; uncertain political conditions; exchange control regulations; foreign ownership limits; different accounting, reporting, and disclosure requirements; difficulties in obtaining legal judgments; and foreign withholding taxes.

The Fund may invest in underlying USAA Funds that invest in bonds. There is a risk that the market value of those bonds will fluctuate because of changes in interest rates, changes in supply and demand for fixed-income securities, and other market factors. Bond prices generally are linked to prevailing market interest rates. In general, when interest rates rise, bond prices fall; and conversely, when interest rates fall, bond prices rise. The price volatility of a bond also depends on its maturity. Generally, the longer the maturity of a bond, the greater is its sensitivity to interest rates. To compensate investors for this higher interest rate risk, bonds with longer maturities generally offer higher yields than bonds with shorter maturities. The Fund may be subject to a greater risk of rising interest rates due to the current period of historically low rates. The ability of an issuer of a debt security to repay principal prior to a security's maturity can increase the security's sensitivity to interest rate changes.

The Fund may invest in underlying USAA Funds that invest in fixed-income securities that 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. Fixed-income securities rated below investment grade, also known as "junk" or high-yield bonds, generally entail greater economic, credit, and liquidity risk than investment-grade securities. Their prices may be more volatile, especially during economic downturns, financial setbacks, or liquidity events.

The Fund may invest in shares of ETFs, which generally are investment companies that hold a portfolio of common stocks or debt securities the shares of which are traded on an exchange. ETFs incur their own management and other fees and expenses, such as trustees' fees, operating expenses, registration fees, and marketing expenses, a proportionate share of which will be borne indirectly by the Fund. As a result, the Fund's investment in an ETF will cause the Fund to indirectly bear the fees and expenses of the ETF and, in turn, the Fund's performance may be lower than if the Fund were to invest directly in the securities held by the underlying ETFs. In addition, the Fund will be exposed indirectly to all of the risks associated with securities held by the ETFs.

An investment in the Fund is not a deposit in USAA Federal Savings Bank, or any other bank, and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.

Risk Lose Money [Text]

rr_RiskLoseMoney

As with other mutual funds, losing money is a risk of investing in the Fund.

Risk Not Insured Depository Institution [Text]

rr_RiskNotInsuredDepositoryInstitution

An investment in the Fund is not a deposit in USAA Federal Savings Bank, or any other bank, and is not insured or guaranteed by the Federal Deposit Insurance Corporation 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 and performance from year to year for each full calendar year since the Fund's inception. The table shows how the Fund's average annual total returns for the periods indicated compared to those of the Fund's benchmark index. Performance reflects any expense limitations in effect during the periods shown.

Remember, historical performance (before and after taxes) does not necessarily indicate what will happen in the future. For the Fund's most current performance information, log on to usaa.com or call (800) 531-USAA (8722) or (210) 531-8722.

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 and performance from year to year for each full calendar year since the Fund's inception. The table shows how the Fund's average annual total returns for the periods indicated compared to those of the Fund's benchmark index.

Performance Availability Phone [Text]

rr_PerformanceAvailabilityPhone

(800) 531-USAA (8722) or (210) 531-8722

Performance Availability Website Address [Text]

rr_PerformanceAvailabilityWebSiteAddress

usaa.com

Performance Past Does Not Indicate Future [Text]

rr_PerformancePastDoesNotIndicateFuture

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

During the periods shown in the chart:	Returns	Quarter ended
Highest Quarter Return	16.50%	June 30, 2009
Lowest Quarter Return	-14.98%	September 30, 2011
Year-to-Date Return	-1.19%	March 31, 2018

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. In certain situations, the return after taxes on distributions and sale of fund shares may be higher than the other return amounts. A higher after-tax return may result when a capital loss occurs upon redemption and translates into an assumed tax deduction that benefits the shareholder. The actual after-tax returns depend on your tax situation and may differ from those shown. If you hold your shares through a tax-deferred arrangement, such as an individual retirement account (IRA) or 401(k) plan, the after-tax returns shown in the table are not relevant to you.

Performance Table Heading

rr_PerformanceTableHeading

AVERAGE ANNUAL TOTAL RETURNS
For Periods Ended December 31, 2017

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.

Performance Table Not Relevant to Tax Deferred

rr_PerformanceTableNotRelevantToTaxDeferred

If you hold your shares through a tax-deferred arrangement, such as an individual retirement account (IRA) or 401(k) plan, the after-tax returns shown in the table are not relevant to you.

Performance Table Explanation after Tax Higher

rr_PerformanceTableExplanationAfterTaxHigher

In certain situations, the return after taxes on distributions and sale of fund shares may be higher than the other return amounts. A higher after-tax return may result when a capital loss occurs upon redemption and translates into an assumed tax deduction that benefits the shareholder.

Target Retirement 2040 Fund | None or same as Fund Name

Risk/Return:

rr_RiskReturnAbstract

(fees paid directly from your investment)

rr_ShareholderFeeOther

none

Management Fee

rr_ManagementFeesOverAssets

none

Distribution and/or Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

none

Other Expenses

rr_OtherExpensesOverAssets

0.03%

Acquired Fund Fees and Expenses

rr_AcquiredFundFeesAndExpensesOverAssets

0.79%

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

0.82%

^[1]

1 Year

rr_ExpenseExampleYear01

$ 84

3 Years

rr_ExpenseExampleYear03

262

5 Years

rr_ExpenseExampleYear05

455

10 Years

rr_ExpenseExampleYear10

$ 1,014

2009

rr_AnnualReturn2009

32.71%

2010

rr_AnnualReturn2010

16.60%

2011

rr_AnnualReturn2011

(3.75%)

2012

rr_AnnualReturn2012

14.22%

2013

rr_AnnualReturn2013

17.37%

2014

rr_AnnualReturn2014

3.15%

2015

rr_AnnualReturn2015

(2.71%)

2016

rr_AnnualReturn2016

8.97%

2017

rr_AnnualReturn2017

18.46%

Year to Date Return, Label

rr_YearToDateReturnLabel

Year-to-Date Return

Bar Chart, Year to Date Return, Date

rr_BarChartYearToDateReturnDate

Mar. 31, 2018

Bar Chart, Year to Date Return

rr_BarChartYearToDateReturn

(1.19%)

Highest Quarterly Return, Label

rr_HighestQuarterlyReturnLabel

Highest Quarter Return

Highest Quarterly Return, Date

rr_BarChartHighestQuarterlyReturnDate

Jun. 30, 2009

Highest Quarterly Return

rr_BarChartHighestQuarterlyReturn

16.50%

Lowest Quarterly Return, Label

rr_LowestQuarterlyReturnLabel

Lowest Quarter Return

Lowest Quarterly Return, Date

rr_BarChartLowestQuarterlyReturnDate

Sep. 30, 2011

Lowest Quarterly Return

rr_BarChartLowestQuarterlyReturn

(14.98%)

Past 1 Year

rr_AverageAnnualReturnYear01

18.46%

Past 5 Years

rr_AverageAnnualReturnYear05

8.74%

Since Inception

rr_AverageAnnualReturnSinceInception

7.28%

Inception Date

rr_AverageAnnualReturnInceptionDate

Jul. 31, 2008

Target Retirement 2040 Fund | Return After Taxes on Distributions | None or same as Fund Name

Risk/Return:

rr_RiskReturnAbstract

Past 1 Year

rr_AverageAnnualReturnYear01

16.47%

Past 5 Years

rr_AverageAnnualReturnYear05

7.42%

Since Inception

rr_AverageAnnualReturnSinceInception

6.35%

Target Retirement 2040 Fund | Return After Taxes on Distributions and Sale of Fund Shares | None or same as Fund Name

Risk/Return:

rr_RiskReturnAbstract

Past 1 Year

rr_AverageAnnualReturnYear01

11.64%

Past 5 Years

rr_AverageAnnualReturnYear05

6.54%

Since Inception

rr_AverageAnnualReturnSinceInception

5.62%

Target Retirement 2040 Fund | S&P Target Date 2040 Index (reflects no deduction for fees, expenses, or taxes)

Risk/Return:

rr_RiskReturnAbstract

Past 1 Year

rr_AverageAnnualReturnYear01

18.98%

Past 5 Years

rr_AverageAnnualReturnYear05

10.79%

Since Inception

rr_AverageAnnualReturnSinceInception

7.73%

Inception Date

rr_AverageAnnualReturnInceptionDate

Jul. 31, 2008

[1] The Total Annual Fund Operating Expenses for the Fund may not correlate to the ratio of expenses to average daily net assets shown in the financial highlights, which reflect the operating expenses of the Fund and do not include Acquired Fund Fees and Expenses.

XML

Target Retirement 2050 Fund

USAA Target Retirement 2050 Fund Summary

Investment Objective

The USAA Target Retirement 2050 Fund (the Fund) provides capital appreciation and current income consistent with its current investment allocation.

Fees and Expenses

The tables below describe the fees and expenses that you may pay, directly and indirectly, to invest in the Fund. The annual fund operating expenses for the Fund are based on expenses incurred during the Fund's most recently completed fiscal year.

Shareholder Fees

Shareholder Fees	Target Retirement 2050 Fund None or same as Fund Name USD ($)
(fees paid directly from your investment)	none

Annual Fund Operating Expenses

(expenses that you pay each year as a percentage of the value of your investment)

Annual Fund Operating Expenses	Target Retirement 2050 Fund None or same as Fund Name
Management Fee	none
Distribution and/or Service (12b-1) Fees	none
Other Expenses	0.04%
Acquired Fund Fees and Expenses	0.80%
Total Annual Fund Operating Expenses	0.84%	[1]

Example

This example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. Although your actual costs may be higher or lower, you would pay the following expenses on a $10,000 investment, assuming (1) a 5% annual return, (2) the Fund's operating expenses remain the same, and (3) you redeem all of your shares at the end of the periods shown.

Expense Example	1 Year	3 Years	5 Years	10 Years
Target Retirement 2050 Fund | None or same as Fund Name | USD ($)	86	268	466	1,037

Portfolio Turnover

The Fund pays transaction costs, including 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 shares of the Fund are held in a taxable account. These costs, which are not reflected in the Annual Fund Operating Expenses or in the Example, affect the Fund's performance.

For the most recent fiscal year, the Fund's portfolio turnover rate was 30% of the average value of its whole portfolio.

Principal Investment Strategy

The Fund invests in a selection of USAA mutual funds and exchange-traded funds (ETFs) (underlying USAA Funds) in a manner consistent with its current asset allocation as depicted in the "lifestyle transition path," based on the years left until retirement. The lifestyle transition path depicts how the asset allocation strategy shifts the Fund's assets among asset classes as the Fund becomes more conservative over time. The lifestyle transition path reflects the need for reduced investment risks and lower volatility as retirement approaches.

The Fund's asset allocation strategy is designed for investors planning to start withdrawing funds for retirement in or within a few years of the Fund's specific target date (2050). In general, the Fund's asset allocation strategy assumes funds will start being withdrawn for retirement purposes at age 65. However, the Fund should not be selected solely on the basis of an investor's age or the target date. The Fund does not provide guaranteed income for retirement.

Although the underlying USAA Funds are categorized generally as equity investments (equity securities or alternative asset classes) or fixed-income investments, many of these underlying USAA Funds invest in a mix of securities of domestic and foreign issuers, investment-grade and high-yield bonds, and other securities. As a result, the target asset allocation of the Fund may differ from the actual securities held by the underlying USAA Funds. Actual asset allocation also may differ from the lifestyle transition path as a result of market movement. The Fund's portfolio will be rebalanced on a regular basis, taking into account transaction costs. We may adjust the Fund's actual asset allocation from the targets specified in the lifestyle transition path based on market view or other conditions as part of an active asset allocation strategy, or make changes to the lifestyle transition path.

It is currently anticipated that at its target date, the Fund's target asset allocation will consist of approximately 35% of the Fund's net assets allocated to equity investments; and approximately 65% of the Fund's net assets allocated to fixed-income investments. The Fund's target asset allocation will not change after the target date has been reached unless approved by the Fund's Board of Trustees (Board).

Principal Risks

Any investment involves risk, and there is no assurance that the Fund's objective will be achieved. The Fund is actively managed and the investment techniques and risk analyses used by the Fund's manager(s) may not produce the desired results. As you consider an investment in the Fund, you also should take into account your tolerance for the daily fluctuations of the financial markets and whether you can afford to leave your money in the Fund for long periods of time to ride out down periods. As with other mutual funds, losing money is a risk of investing in the Fund.

The risks of the Fund directly correspond to the risks of the underlying USAA Funds in which the Fund invests. By investing in the underlying USAA Funds, the Fund has exposure to the risk of many different areas of the market. The degree to which the risks described below apply to the Fund varies according to the Fund's asset allocation. For instance, the more the Fund is allocated to stock funds, the greater the risk associated with equity securities. The Fund also is subject to asset allocation risk (i.e., the risk that allocations will not produce the intended results) and to management risk (i.e., the risk that the selection of underlying USAA Funds will not produce the intended results).

In managing a Fund that invests in underlying USAA Funds, USAA Asset Management Company (Adviser) may be subject to potential conflicts of interest in allocating the Fund's assets among the various underlying USAA Funds. This is because the fees payable by some of the underlying USAA Funds to the Adviser and/or its affiliates are higher than the fees payable by other underlying USAA Funds and because the Adviser also is responsible for managing and administering the underlying USAA Funds.

The Fund may invest in underlying USAA Funds that invest in equity securities, which are subject to stock market risk. Stock prices in general may decline over short or even extended periods, regardless of the success or failure of a company's operations. Equity securities tend to be more volatile than bonds. In addition, to the degree an underlying USAA Fund invests in foreign securities, there is a possibility that the value of the Fund's investments in foreign securities will decrease because of unique risks, such as currency exchange-rate fluctuations; foreign market illiquidity; emerging-market risk; increased price volatility; uncertain political conditions; exchange control regulations; foreign ownership limits; different accounting, reporting, and disclosure requirements; difficulties in obtaining legal judgments; and foreign withholding taxes.

The Fund may invest in underlying USAA Funds that invest in bonds. There is a risk that the market value of those bonds will fluctuate because of changes in interest rates, changes in supply and demand for fixed-income securities, and other market factors. Bond prices generally are linked to prevailing market interest rates. In general, when interest rates rise, bond prices fall; and conversely, when interest rates fall, bond prices rise. The price volatility of a bond also depends on its maturity. Generally, the longer the maturity of a bond, the greater is its sensitivity to interest rates. To compensate investors for this higher interest rate risk, bonds with longer maturities generally offer higher yields than bonds with shorter maturities. The Fund may be subject to a greater risk of rising interest rates due to the current period of historically low rates. The ability of an issuer of a debt security to repay principal prior to a security's maturity can increase the security's sensitivity to interest rate changes.

The Fund may invest in underlying USAA Funds that invest in fixed-income securities that 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. Fixed-income securities rated below investment grade, also known as "junk" or high-yield bonds, generally entail greater economic, credit, and liquidity risk than investment-grade securities. Their prices may be more volatile, especially during economic downturns, financial setbacks, or liquidity events.

The Fund may invest in shares of ETFs, which generally are investment companies that hold a portfolio of common stocks or debt securities the shares of which are traded on an exchange. ETFs incur their own management and other fees and expenses, such as trustees' fees, operating expenses, registration fees, and marketing expenses, a proportionate share of which will be borne indirectly by the Fund. As a result, the Fund's investment in an ETF will cause the Fund to indirectly bear the fees and expenses of the ETF and, in turn, the Fund's performance may be lower than if the Fund were to invest directly in the securities held by the underlying ETFs. In addition, the Fund will be exposed indirectly to all of the risks associated with securities held by the ETFs.

An investment in the Fund is not a deposit in USAA Federal Savings Bank, or any other bank, and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.

Performance

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 and performance from year to year for each full calendar year since the Fund's inception. The table shows how the Fund's average annual total returns for the periods indicated compared to those of the Fund's benchmark index. Performance reflects any expense limitations in effect during the periods shown.

Remember, historical performance (before and after taxes) does not necessarily indicate what will happen in the future. For the Fund's most current performance information, log on to usaa.com or call (800) 531-USAA (8722) or (210) 531-8722.

RISK/RETURN BAR CHART
Annual Returns for Periods Ended December 31

During the periods shown in the chart:	Returns	Quarter ended
Highest Quarter Return	17.33%	September 30, 2009
Lowest Quarter Return	-16.67%	September 30, 2011
Year-to-Date Return	-1.25%	March 31, 2018

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. In certain situations, the return after taxes on distributions and sale of fund shares may be higher than the other return amounts. A higher after-tax return may result when a capital loss occurs upon redemption and translates into an assumed tax deduction that benefits the shareholder. The actual after-tax returns depend on your tax situation and may differ from those shown. If you hold your shares through a tax-deferred arrangement, such as an individual retirement account (IRA) or 401(k) plan, the after-tax returns shown in the table are not relevant to you.

AVERAGE ANNUAL TOTAL RETURNS
For Periods Ended December 31, 2017

Average Annual Total Returns - Target Retirement 2050 Fund	Past 1 Year	Past 5 Years	Since Inception	Inception Date
None or same as Fund Name	19.39%	9.21%	6.86%	Jul. 31, 2008
None or same as Fund Name | Return After Taxes on Distributions	17.69%	8.06%	6.15%
None or same as Fund Name | Return After Taxes on Distributions and Sale of Fund Shares	12.03%	7.00%	5.38%
S&P Target Date 2050 Index (reflects no deduction for fees, expenses, or taxes)	20.30%	11.49%	7.98%	Jul. 31, 2008

[1] The Total Annual Fund Operating Expenses for the Fund may not correlate to the ratio of expenses to average daily net assets shown in the financial highlights, which reflect the operating expenses of the Fund and do not include Acquired Fund Fees and Expenses.

XML

Label

Element

Value

Risk/Return:

rr_RiskReturnAbstract

Registrant Name

dei_EntityRegistrantName

USAA MUTUAL FUNDS TRUST

Prospectus Date

rr_ProspectusDate

May 01, 2018

Target Retirement 2050 Fund

Risk/Return:

rr_RiskReturnAbstract

Risk/Return [Heading]

rr_RiskReturnHeading

USAA Target Retirement 2050 Fund Summary

Objective [Heading]

rr_ObjectiveHeading

Investment Objective

Objective, Primary [Text Block]

rr_ObjectivePrimaryTextBlock

The USAA Target Retirement 2050 Fund (the Fund) provides capital appreciation and current income consistent with its current investment allocation.

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. The annual fund operating expenses for the Fund are based on expenses incurred during the Fund's most recently completed fiscal year.

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)

Portfolio Turnover [Heading]

rr_PortfolioTurnoverHeading

Portfolio Turnover

Portfolio Turnover [Text Block]

rr_PortfolioTurnoverTextBlock

The Fund pays transaction costs, including 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 shares of the Fund are held in a taxable account. These costs, which are not reflected in the Annual Fund Operating Expenses or in the Example, affect the Fund's performance.

For the most recent fiscal year, the Fund's portfolio turnover rate was 30% of the average value of its whole portfolio.

Portfolio Turnover, Rate

rr_PortfolioTurnoverRate

30.00%

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. Although your actual costs may be higher or lower, you would pay the following expenses on a $10,000 investment, assuming (1) a 5% annual return, (2) the Fund's operating expenses remain the same, and (3) you redeem all of your shares at the end of the periods shown.

Strategy [Heading]

rr_StrategyHeading

Principal Investment Strategy

Strategy Narrative [Text Block]

rr_StrategyNarrativeTextBlock

The Fund invests in a selection of USAA mutual funds and exchange-traded funds (ETFs) (underlying USAA Funds) in a manner consistent with its current asset allocation as depicted in the "lifestyle transition path," based on the years left until retirement. The lifestyle transition path depicts how the asset allocation strategy shifts the Fund's assets among asset classes as the Fund becomes more conservative over time. The lifestyle transition path reflects the need for reduced investment risks and lower volatility as retirement approaches.

The Fund's asset allocation strategy is designed for investors planning to start withdrawing funds for retirement in or within a few years of the Fund's specific target date (2050). In general, the Fund's asset allocation strategy assumes funds will start being withdrawn for retirement purposes at age 65. However, the Fund should not be selected solely on the basis of an investor's age or the target date. The Fund does not provide guaranteed income for retirement.

Although the underlying USAA Funds are categorized generally as equity investments (equity securities or alternative asset classes) or fixed-income investments, many of these underlying USAA Funds invest in a mix of securities of domestic and foreign issuers, investment-grade and high-yield bonds, and other securities. As a result, the target asset allocation of the Fund may differ from the actual securities held by the underlying USAA Funds. Actual asset allocation also may differ from the lifestyle transition path as a result of market movement. The Fund's portfolio will be rebalanced on a regular basis, taking into account transaction costs. We may adjust the Fund's actual asset allocation from the targets specified in the lifestyle transition path based on market view or other conditions as part of an active asset allocation strategy, or make changes to the lifestyle transition path.

It is currently anticipated that at its target date, the Fund's target asset allocation will consist of approximately 35% of the Fund's net assets allocated to equity investments; and approximately 65% of the Fund's net assets allocated to fixed-income investments. The Fund's target asset allocation will not change after the target date has been reached unless approved by the Fund's Board of Trustees (Board).

Risk [Heading]

rr_RiskHeading

Principal Risks

Risk Narrative [Text Block]

rr_RiskNarrativeTextBlock

Any investment involves risk, and there is no assurance that the Fund's objective will be achieved. The Fund is actively managed and the investment techniques and risk analyses used by the Fund's manager(s) may not produce the desired results. As you consider an investment in the Fund, you also should take into account your tolerance for the daily fluctuations of the financial markets and whether you can afford to leave your money in the Fund for long periods of time to ride out down periods. As with other mutual funds, losing money is a risk of investing in the Fund.

The risks of the Fund directly correspond to the risks of the underlying USAA Funds in which the Fund invests. By investing in the underlying USAA Funds, the Fund has exposure to the risk of many different areas of the market. The degree to which the risks described below apply to the Fund varies according to the Fund's asset allocation. For instance, the more the Fund is allocated to stock funds, the greater the risk associated with equity securities. The Fund also is subject to asset allocation risk (i.e., the risk that allocations will not produce the intended results) and to management risk (i.e., the risk that the selection of underlying USAA Funds will not produce the intended results).

In managing a Fund that invests in underlying USAA Funds, USAA Asset Management Company (Adviser) may be subject to potential conflicts of interest in allocating the Fund's assets among the various underlying USAA Funds. This is because the fees payable by some of the underlying USAA Funds to the Adviser and/or its affiliates are higher than the fees payable by other underlying USAA Funds and because the Adviser also is responsible for managing and administering the underlying USAA Funds.

The Fund may invest in underlying USAA Funds that invest in equity securities, which are subject to stock market risk. Stock prices in general may decline over short or even extended periods, regardless of the success or failure of a company's operations. Equity securities tend to be more volatile than bonds. In addition, to the degree an underlying USAA Fund invests in foreign securities, there is a possibility that the value of the Fund's investments in foreign securities will decrease because of unique risks, such as currency exchange-rate fluctuations; foreign market illiquidity; emerging-market risk; increased price volatility; uncertain political conditions; exchange control regulations; foreign ownership limits; different accounting, reporting, and disclosure requirements; difficulties in obtaining legal judgments; and foreign withholding taxes.

The Fund may invest in underlying USAA Funds that invest in bonds. There is a risk that the market value of those bonds will fluctuate because of changes in interest rates, changes in supply and demand for fixed-income securities, and other market factors. Bond prices generally are linked to prevailing market interest rates. In general, when interest rates rise, bond prices fall; and conversely, when interest rates fall, bond prices rise. The price volatility of a bond also depends on its maturity. Generally, the longer the maturity of a bond, the greater is its sensitivity to interest rates. To compensate investors for this higher interest rate risk, bonds with longer maturities generally offer higher yields than bonds with shorter maturities. The Fund may be subject to a greater risk of rising interest rates due to the current period of historically low rates. The ability of an issuer of a debt security to repay principal prior to a security's maturity can increase the security's sensitivity to interest rate changes.

The Fund may invest in underlying USAA Funds that invest in fixed-income securities that 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. Fixed-income securities rated below investment grade, also known as "junk" or high-yield bonds, generally entail greater economic, credit, and liquidity risk than investment-grade securities. Their prices may be more volatile, especially during economic downturns, financial setbacks, or liquidity events.

The Fund may invest in shares of ETFs, which generally are investment companies that hold a portfolio of common stocks or debt securities the shares of which are traded on an exchange. ETFs incur their own management and other fees and expenses, such as trustees' fees, operating expenses, registration fees, and marketing expenses, a proportionate share of which will be borne indirectly by the Fund. As a result, the Fund's investment in an ETF will cause the Fund to indirectly bear the fees and expenses of the ETF and, in turn, the Fund's performance may be lower than if the Fund were to invest directly in the securities held by the underlying ETFs. In addition, the Fund will be exposed indirectly to all of the risks associated with securities held by the ETFs.

An investment in the Fund is not a deposit in USAA Federal Savings Bank, or any other bank, and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.

Risk Lose Money [Text]

rr_RiskLoseMoney

As with other mutual funds, losing money is a risk of investing in the Fund.

Risk Not Insured Depository Institution [Text]

rr_RiskNotInsuredDepositoryInstitution

An investment in the Fund is not a deposit in USAA Federal Savings Bank, or any other bank, and is not insured or guaranteed by the Federal Deposit Insurance Corporation 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 and performance from year to year for each full calendar year since the Fund's inception. The table shows how the Fund's average annual total returns for the periods indicated compared to those of the Fund's benchmark index. Performance reflects any expense limitations in effect during the periods shown.

Remember, historical performance (before and after taxes) does not necessarily indicate what will happen in the future. For the Fund's most current performance information, log on to usaa.com or call (800) 531-USAA (8722) or (210) 531-8722.

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 and performance from year to year for each full calendar year since the Fund's inception. The table shows how the Fund's average annual total returns for the periods indicated compared to those of the Fund's benchmark index.

Performance Availability Phone [Text]

rr_PerformanceAvailabilityPhone

(800) 531-USAA (8722) or (210) 531-8722

Performance Availability Website Address [Text]

rr_PerformanceAvailabilityWebSiteAddress

usaa.com

Performance Past Does Not Indicate Future [Text]

rr_PerformancePastDoesNotIndicateFuture

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

During the periods shown in the chart:	Returns	Quarter ended
Highest Quarter Return	17.33%	September 30, 2009
Lowest Quarter Return	-16.67%	September 30, 2011
Year-to-Date Return	-1.25%	March 31, 2018

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. In certain situations, the return after taxes on distributions and sale of fund shares may be higher than the other return amounts. A higher after-tax return may result when a capital loss occurs upon redemption and translates into an assumed tax deduction that benefits the shareholder. The actual after-tax returns depend on your tax situation and may differ from those shown. If you hold your shares through a tax-deferred arrangement, such as an individual retirement account (IRA) or 401(k) plan, the after-tax returns shown in the table are not relevant to you.

Performance Table Heading

rr_PerformanceTableHeading

AVERAGE ANNUAL TOTAL RETURNS
For Periods Ended December 31, 2017

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.

Performance Table Not Relevant to Tax Deferred

rr_PerformanceTableNotRelevantToTaxDeferred

If you hold your shares through a tax-deferred arrangement, such as an individual retirement account (IRA) or 401(k) plan, the after-tax returns shown in the table are not relevant to you.

Performance Table Explanation after Tax Higher

rr_PerformanceTableExplanationAfterTaxHigher

In certain situations, the return after taxes on distributions and sale of fund shares may be higher than the other return amounts. A higher after-tax return may result when a capital loss occurs upon redemption and translates into an assumed tax deduction that benefits the shareholder.

Target Retirement 2050 Fund | None or same as Fund Name

Risk/Return:

rr_RiskReturnAbstract

(fees paid directly from your investment)

rr_ShareholderFeeOther

none

Management Fee

rr_ManagementFeesOverAssets

none

Distribution and/or Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

none

Other Expenses

rr_OtherExpensesOverAssets

0.04%

Acquired Fund Fees and Expenses

rr_AcquiredFundFeesAndExpensesOverAssets

0.80%

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

0.84%

^[1]

1 Year

rr_ExpenseExampleYear01

$ 86

3 Years

rr_ExpenseExampleYear03

268

5 Years

rr_ExpenseExampleYear05

466

10 Years

rr_ExpenseExampleYear10

$ 1,037

2009

rr_AnnualReturn2009

31.84%

2010

rr_AnnualReturn2010

16.70%

2011

rr_AnnualReturn2011

(5.27%)

2012

rr_AnnualReturn2012

14.97%

2013

rr_AnnualReturn2013

18.81%

2014

rr_AnnualReturn2014

3.02%

2015

rr_AnnualReturn2015

(2.48%)

2016

rr_AnnualReturn2016

9.02%

2017

rr_AnnualReturn2017

19.39%

Year to Date Return, Label

rr_YearToDateReturnLabel

Year-to-Date Return

Bar Chart, Year to Date Return, Date

rr_BarChartYearToDateReturnDate

Mar. 31, 2018

Bar Chart, Year to Date Return

rr_BarChartYearToDateReturn

(1.25%)

Highest Quarterly Return, Label

rr_HighestQuarterlyReturnLabel

Highest Quarter Return

Highest Quarterly Return, Date

rr_BarChartHighestQuarterlyReturnDate

Sep. 30, 2009

Highest Quarterly Return

rr_BarChartHighestQuarterlyReturn

17.33%

Lowest Quarterly Return, Label

rr_LowestQuarterlyReturnLabel

Lowest Quarter Return

Lowest Quarterly Return, Date

rr_BarChartLowestQuarterlyReturnDate

Sep. 30, 2011

Lowest Quarterly Return

rr_BarChartLowestQuarterlyReturn

(16.67%)

Past 1 Year

rr_AverageAnnualReturnYear01

19.39%

Past 5 Years

rr_AverageAnnualReturnYear05

9.21%

Since Inception

rr_AverageAnnualReturnSinceInception

6.86%

Inception Date

rr_AverageAnnualReturnInceptionDate

Jul. 31, 2008

Target Retirement 2050 Fund | Return After Taxes on Distributions | None or same as Fund Name

Risk/Return:

rr_RiskReturnAbstract

Past 1 Year

rr_AverageAnnualReturnYear01

17.69%

Past 5 Years

rr_AverageAnnualReturnYear05

8.06%

Since Inception

rr_AverageAnnualReturnSinceInception

6.15%

Target Retirement 2050 Fund | Return After Taxes on Distributions and Sale of Fund Shares | None or same as Fund Name

Risk/Return:

rr_RiskReturnAbstract

Past 1 Year

rr_AverageAnnualReturnYear01

12.03%

Past 5 Years

rr_AverageAnnualReturnYear05

7.00%

Since Inception

rr_AverageAnnualReturnSinceInception

5.38%

Target Retirement 2050 Fund | S&P Target Date 2050 Index (reflects no deduction for fees, expenses, or taxes)

Risk/Return:

rr_RiskReturnAbstract

Past 1 Year

rr_AverageAnnualReturnYear01

20.30%

Past 5 Years

rr_AverageAnnualReturnYear05

11.49%

Since Inception

rr_AverageAnnualReturnSinceInception

7.98%

Inception Date

rr_AverageAnnualReturnInceptionDate

Jul. 31, 2008

[1] The Total Annual Fund Operating Expenses for the Fund may not correlate to the ratio of expenses to average daily net assets shown in the financial highlights, which reflect the operating expenses of the Fund and do not include Acquired Fund Fees and Expenses.

XML

Target Retirement 2060 Fund

USAA Target Retirement 2060 Fund Summary

Investment Objective

The USAA Target Retirement 2060 Fund (the Fund) provides capital appreciation and current income consistent with its current investment allocation.

Fees and Expenses

The tables below describe the fees and expenses that you may pay, directly and indirectly, to invest in the Fund. The annual fund operating expenses for the Fund are based on expenses incurred during the Fund's most recently completed fiscal year.

Shareholder Fees

Shareholder Fees	Target Retirement 2060 Fund None or same as Fund Name USD ($)
(fees paid directly from your investment)	none

Annual Fund Operating Expenses

(expenses that you pay each year as a percentage of the value of your investment)

Annual Fund Operating Expenses	Target Retirement 2060 Fund None or same as Fund Name
Management Fee	none
Distribution and/or Service (12b-1) Fees	none
Other Expenses	0.29%
Acquired Fund Fees and Expenses	0.80%
Total Annual Fund Operating Expenses	1.09%	[1]
Reimbursement from Adviser	(0.19%)	[2]
Total Annual Fund Operating Expenses after Reimbursement	0.90%

Example

This example is intended to help you compare the cost of investing in this Fund with the cost of investing in other mutual funds. Although your actual costs may be higher or lower, you would pay the following expenses on a $10,000 investment, assuming (1) a 5% annual return, (2) the Fund's operating expenses remain the same, (3) you redeem all of your shares at the end of the periods shown, and (4) the expense reimbursement arrangement for the Fund is not continued beyond one year.

Expense Example	1 Year	3 Years	5 Years	10 Years
Target Retirement 2060 Fund | None or same as Fund Name | USD ($)	92	328	582	1,312

Portfolio Turnover

The Fund pays transaction costs, including 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 shares of the Fund are held in a taxable account. These costs, which are not reflected in the Annual Fund Operating Expenses or in the Example, affect the Fund's performance.

For the most recent fiscal year, the Fund's portfolio turnover rate was 37% of the average value of its whole portfolio.

Principal Investment Strategy

The Fund invests in a selection of USAA mutual funds and exchange-traded funds (ETFs) (underlying USAA Funds) in a manner consistent with its current asset allocation as depicted in the "lifestyle transition path," based on the years left until retirement. The lifestyle transition path depicts how the asset allocation strategy shifts the Fund's assets among asset classes as the Fund becomes more conservative over time. The lifestyle transition path reflects the need for reduced investment risks and lower volatility as retirement approaches.

The Fund's asset allocation strategy is designed for investors planning to start withdrawing funds for retirement in or within a few years of the Fund's specific target date (2060). In general, the Fund's asset allocation strategy assumes funds will start being withdrawn for retirement purposes at age 65. However, the Fund should not be selected solely on the basis of an investor's age or the target date. The Fund does not provide guaranteed income for retirement.

Although the underlying USAA Funds are categorized generally as equity investments (equity securities or alternative asset classes) or fixed-income investments, many of these underlying USAA Funds invest in a mix of securities of domestic and foreign issuers, investment-grade and high-yield bonds, and other securities. As a result, the target asset allocation of the Fund may differ from the actual securities held by the underlying USAA Funds. Actual asset allocation also may differ from the lifestyle transition path as a result of market movement. The Fund's portfolio will be rebalanced on a regular basis, taking into account transaction costs. We may adjust the Fund's actual asset allocation from the targets specified in the lifestyle transition path based on market view or other conditions as part of an active asset allocation strategy, or make changes to the lifestyle transition path.

It is currently anticipated that at its target date, the Fund's target asset allocation will consist of approximately 35% of the Fund's net assets allocated to equity investments; and approximately 65% of the Fund's net assets allocated to fixed-income investments. The Fund's target asset allocation will not change after the target date has been reached unless approved by the Fund's Board of Trustees (Board).

Principal Risks

Any investment involves risk, and there is no assurance that the Fund's objective will be achieved. The Fund is actively managed and the investment techniques and risk analyses used by the Fund's manager(s) may not produce the desired results. As you consider an investment in the Fund, you also should take into account your tolerance for the daily fluctuations of the financial markets and whether you can afford to leave your money in the Fund for long periods of time to ride out down periods. As with other mutual funds, losing money is a risk of investing in the Fund.

The risks of the Fund directly correspond to the risks of the underlying USAA Funds in which the Fund invests. By investing in the underlying USAA Funds, the Fund has exposure to the risk of many different areas of the market. The degree to which the risks described below apply to the Fund varies according to the Fund's asset allocation. For instance, the more the Fund is allocated to stock funds, the greater the risk associated with equity securities. The Fund also is subject to asset allocation risk (i.e., the risk that allocations will not produce the intended results) and to management risk (i.e., the risk that the selection of underlying USAA Funds will not produce the intended results).

In managing a Fund that invests in underlying USAA Funds, USAA Asset Management Company (Adviser) may be subject to potential conflicts of interest in allocating the Fund's assets among the various underlying USAA Funds. This is because the fees payable by some of the underlying USAA Funds to the Adviser and/or its affiliates are higher than the fees payable by other underlying USAA Funds and because the Adviser also is responsible for managing and administering the underlying USAA Funds.

The Fund may invest in underlying USAA Funds that invest in equity securities, which are subject to stock market risk. Stock prices in general may decline over short or even extended periods, regardless of the success or failure of a company's operations. Equity securities tend to be more volatile than bonds. In addition, to the degree an underlying USAA Fund invests in foreign securities, there is a possibility that the value of the Fund's investments in foreign securities will decrease because of unique risks, such as currency exchange-rate fluctuations; foreign market illiquidity; emerging-market risk; increased price volatility; uncertain political conditions; exchange control regulations; foreign ownership limits; different accounting, reporting, and disclosure requirements; difficulties in obtaining legal judgments; and foreign withholding taxes.

The Fund may invest in underlying USAA Funds that invest in bonds. There is a risk that the market value of those bonds will fluctuate because of changes in interest rates, changes in supply and demand for fixed-income securities, and other market factors. Bond prices generally are linked to prevailing market interest rates. In general, when interest rates rise, bond prices fall; and conversely, when interest rates fall, bond prices rise. The price volatility of a bond also depends on its maturity. Generally, the longer the maturity of a bond, the greater is its sensitivity to interest rates. To compensate investors for this higher interest rate risk, bonds with longer maturities generally offer higher yields than bonds with shorter maturities. The Fund may be subject to a greater risk of rising interest rates due to the current period of historically low rates. The ability of an issuer of a debt security to repay principal prior to a security's maturity can increase the security's sensitivity to interest rate changes.

The Fund may invest in underlying USAA Funds that invest in fixed-income securities that 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. Fixed-income securities rated below investment grade, also known as "junk" or high-yield bonds, generally entail greater economic, credit, and liquidity risk than investment-grade securities. Their prices may be more volatile, especially during economic downturns, financial setbacks, or liquidity events.

The Fund may invest in shares of ETFs, which generally are investment companies that hold a portfolio of common stocks or debt securities the shares of which are traded on an exchange. ETFs incur their own management and other fees and expenses, such as trustees' fees, operating expenses, registration fees, and marketing expenses, a proportionate share of which will be borne indirectly by the Fund. As a result, the Fund's investment in an ETF will cause the Fund to indirectly bear the fees and expenses of the ETF and, in turn, the Fund's performance may be lower than if the Fund were to invest directly in the securities held by the underlying ETFs. In addition, the Fund will be exposed indirectly to all of the risks associated with securities held by the ETFs.

An investment in the Fund is not a deposit in USAA Federal Savings Bank, or any other bank, and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.

Performance

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 and performance from year to year for each full calendar year since the Fund's inception. The table shows how the Fund's average annual total returns for the periods indicated compared to those of the Fund's benchmark index. Performance reflects any expense limitations in effect during the periods shown.

Remember, historical performance (before and after taxes) does not necessarily indicate what will happen in the future. For the Fund's most current performance information, log on to usaa.com or call (800) 531-USAA (8722) or (210) 531-8722.

RISK/RETURN BAR CHART
Annual Returns for Periods Ended December 31

During the periods shown in the chart:	Returns	Quarter ended
Highest Quarter Return	5.60%	March 31, 2017
Lowest Quarter Return	-7.95%	September 30, 2015
Year-to-Date Return	-1.33%	March 31, 2018

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. In certain situations, the return after taxes on distributions and sale of fund shares may be higher than the other return amounts. A higher after-tax return may result when a capital loss occurs upon redemption and translates into an assumed tax deduction that benefits the shareholder. The actual after-tax returns depend on your tax situation and may differ from those shown. If you hold your shares through a tax-deferred arrangement, such as an individual retirement account (IRA) or 401(k) plan, the after-tax returns shown in the table are not relevant to you.

AVERAGE ANNUAL TOTAL RETURNS
For Periods Ended December 31, 2017

Average Annual Total Returns - Target Retirement 2060 Fund	Past 1 Year	Since Inception	Inception Date
None or same as Fund Name | Return Before Taxes	19.51%	8.35%	Jul. 12, 2013
None or same as Fund Name | Return After Taxes on Distributions	18.21%	7.55%
None or same as Fund Name | Return After Taxes on Distributions and Sale of Fund Shares	11.66%	6.35%
S&P Target Date 2060 Index (reflects no deduction for fees, expenses, or taxes)	20.87%	10.15%	Jul. 12, 2013

[1] The Total Annual Fund Operating Expenses for the Fund may not correlate to the ratio of expenses to average daily net assets shown in the financial highlights, which reflect the operating expenses of the Fund and do not include Acquired Fund Fees and Expenses.

[2] The Investment Adviser has agreed, through April 30, 2019, to make payments or waive management, administration, and other fees to limit the expenses of the Fund so that the Total Annual Fund Operating Expenses (exclusive of commission recapture, expense offset arrangements, acquired fund fees and expenses, and extraordinary expenses) do not exceed an annual rate of 0.10% of the Fund's average daily net assets. This reimbursement arrangement may not be changed or terminated during this time period without approval of the Fund's Board of Trustees and may be changed or terminated by Investment Adviser at any time after April 30, 2019.

XML

Label

Element

Value

Risk/Return:

rr_RiskReturnAbstract

Registrant Name

dei_EntityRegistrantName

USAA MUTUAL FUNDS TRUST

Prospectus Date

rr_ProspectusDate

May 01, 2018

Target Retirement 2060 Fund

Risk/Return:

rr_RiskReturnAbstract

Risk/Return [Heading]

rr_RiskReturnHeading

USAA Target Retirement 2060 Fund Summary

Objective [Heading]

rr_ObjectiveHeading

Investment Objective

Objective, Primary [Text Block]

rr_ObjectivePrimaryTextBlock

The USAA Target Retirement 2060 Fund (the Fund) provides capital appreciation and current income consistent with its current investment allocation.

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. The annual fund operating expenses for the Fund are based on expenses incurred during the Fund's most recently completed fiscal year.

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

April 30, 2019

Portfolio Turnover [Heading]

rr_PortfolioTurnoverHeading

Portfolio Turnover

Portfolio Turnover [Text Block]

rr_PortfolioTurnoverTextBlock

The Fund pays transaction costs, including 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 shares of the Fund are held in a taxable account. These costs, which are not reflected in the Annual Fund Operating Expenses or in the Example, affect the Fund's performance.

For the most recent fiscal year, the Fund's portfolio turnover rate was 37% of the average value of its whole portfolio.

Portfolio Turnover, Rate

rr_PortfolioTurnoverRate

37.00%

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 this Fund with the cost of investing in other mutual funds. Although your actual costs may be higher or lower, you would pay the following expenses on a $10,000 investment, assuming (1) a 5% annual return, (2) the Fund's operating expenses remain the same, (3) you redeem all of your shares at the end of the periods shown, and (4) the expense reimbursement arrangement for the Fund is not continued beyond one year.

Strategy [Heading]

rr_StrategyHeading

Principal Investment Strategy

Strategy Narrative [Text Block]

rr_StrategyNarrativeTextBlock

The Fund invests in a selection of USAA mutual funds and exchange-traded funds (ETFs) (underlying USAA Funds) in a manner consistent with its current asset allocation as depicted in the "lifestyle transition path," based on the years left until retirement. The lifestyle transition path depicts how the asset allocation strategy shifts the Fund's assets among asset classes as the Fund becomes more conservative over time. The lifestyle transition path reflects the need for reduced investment risks and lower volatility as retirement approaches.

The Fund's asset allocation strategy is designed for investors planning to start withdrawing funds for retirement in or within a few years of the Fund's specific target date (2060). In general, the Fund's asset allocation strategy assumes funds will start being withdrawn for retirement purposes at age 65. However, the Fund should not be selected solely on the basis of an investor's age or the target date. The Fund does not provide guaranteed income for retirement.

Although the underlying USAA Funds are categorized generally as equity investments (equity securities or alternative asset classes) or fixed-income investments, many of these underlying USAA Funds invest in a mix of securities of domestic and foreign issuers, investment-grade and high-yield bonds, and other securities. As a result, the target asset allocation of the Fund may differ from the actual securities held by the underlying USAA Funds. Actual asset allocation also may differ from the lifestyle transition path as a result of market movement. The Fund's portfolio will be rebalanced on a regular basis, taking into account transaction costs. We may adjust the Fund's actual asset allocation from the targets specified in the lifestyle transition path based on market view or other conditions as part of an active asset allocation strategy, or make changes to the lifestyle transition path.

It is currently anticipated that at its target date, the Fund's target asset allocation will consist of approximately 35% of the Fund's net assets allocated to equity investments; and approximately 65% of the Fund's net assets allocated to fixed-income investments. The Fund's target asset allocation will not change after the target date has been reached unless approved by the Fund's Board of Trustees (Board).

Risk [Heading]

rr_RiskHeading

Principal Risks

Risk Narrative [Text Block]

rr_RiskNarrativeTextBlock

Any investment involves risk, and there is no assurance that the Fund's objective will be achieved. The Fund is actively managed and the investment techniques and risk analyses used by the Fund's manager(s) may not produce the desired results. As you consider an investment in the Fund, you also should take into account your tolerance for the daily fluctuations of the financial markets and whether you can afford to leave your money in the Fund for long periods of time to ride out down periods. As with other mutual funds, losing money is a risk of investing in the Fund.

The risks of the Fund directly correspond to the risks of the underlying USAA Funds in which the Fund invests. By investing in the underlying USAA Funds, the Fund has exposure to the risk of many different areas of the market. The degree to which the risks described below apply to the Fund varies according to the Fund's asset allocation. For instance, the more the Fund is allocated to stock funds, the greater the risk associated with equity securities. The Fund also is subject to asset allocation risk (i.e., the risk that allocations will not produce the intended results) and to management risk (i.e., the risk that the selection of underlying USAA Funds will not produce the intended results).

In managing a Fund that invests in underlying USAA Funds, USAA Asset Management Company (Adviser) may be subject to potential conflicts of interest in allocating the Fund's assets among the various underlying USAA Funds. This is because the fees payable by some of the underlying USAA Funds to the Adviser and/or its affiliates are higher than the fees payable by other underlying USAA Funds and because the Adviser also is responsible for managing and administering the underlying USAA Funds.

The Fund may invest in underlying USAA Funds that invest in equity securities, which are subject to stock market risk. Stock prices in general may decline over short or even extended periods, regardless of the success or failure of a company's operations. Equity securities tend to be more volatile than bonds. In addition, to the degree an underlying USAA Fund invests in foreign securities, there is a possibility that the value of the Fund's investments in foreign securities will decrease because of unique risks, such as currency exchange-rate fluctuations; foreign market illiquidity; emerging-market risk; increased price volatility; uncertain political conditions; exchange control regulations; foreign ownership limits; different accounting, reporting, and disclosure requirements; difficulties in obtaining legal judgments; and foreign withholding taxes.

The Fund may invest in underlying USAA Funds that invest in bonds. There is a risk that the market value of those bonds will fluctuate because of changes in interest rates, changes in supply and demand for fixed-income securities, and other market factors. Bond prices generally are linked to prevailing market interest rates. In general, when interest rates rise, bond prices fall; and conversely, when interest rates fall, bond prices rise. The price volatility of a bond also depends on its maturity. Generally, the longer the maturity of a bond, the greater is its sensitivity to interest rates. To compensate investors for this higher interest rate risk, bonds with longer maturities generally offer higher yields than bonds with shorter maturities. The Fund may be subject to a greater risk of rising interest rates due to the current period of historically low rates. The ability of an issuer of a debt security to repay principal prior to a security's maturity can increase the security's sensitivity to interest rate changes.

The Fund may invest in underlying USAA Funds that invest in fixed-income securities that 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. Fixed-income securities rated below investment grade, also known as "junk" or high-yield bonds, generally entail greater economic, credit, and liquidity risk than investment-grade securities. Their prices may be more volatile, especially during economic downturns, financial setbacks, or liquidity events.

The Fund may invest in shares of ETFs, which generally are investment companies that hold a portfolio of common stocks or debt securities the shares of which are traded on an exchange. ETFs incur their own management and other fees and expenses, such as trustees' fees, operating expenses, registration fees, and marketing expenses, a proportionate share of which will be borne indirectly by the Fund. As a result, the Fund's investment in an ETF will cause the Fund to indirectly bear the fees and expenses of the ETF and, in turn, the Fund's performance may be lower than if the Fund were to invest directly in the securities held by the underlying ETFs. In addition, the Fund will be exposed indirectly to all of the risks associated with securities held by the ETFs.

An investment in the Fund is not a deposit in USAA Federal Savings Bank, or any other bank, and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.

Risk Lose Money [Text]

rr_RiskLoseMoney

As with other mutual funds, losing money is a risk of investing in the Fund.

Risk Not Insured Depository Institution [Text]

rr_RiskNotInsuredDepositoryInstitution

An investment in the Fund is not a deposit in USAA Federal Savings Bank, or any other bank, and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.

Bar Chart and Performance Table [Heading]

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Performance

Performance Narrative [Text Block]

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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 and performance from year to year for each full calendar year since the Fund's inception. The table shows how the Fund's average annual total returns for the periods indicated compared to those of the Fund's benchmark index. Performance reflects any expense limitations in effect during the periods shown.

Remember, historical performance (before and after taxes) does not necessarily indicate what will happen in the future. For the Fund's most current performance information, log on to usaa.com or call (800) 531-USAA (8722) or (210) 531-8722.

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 and performance from year to year for each full calendar year since the Fund's inception. The table shows how the Fund's average annual total returns for the periods indicated compared to those of the Fund's benchmark index.

Performance Availability Phone [Text]

rr_PerformanceAvailabilityPhone

(800) 531-USAA (8722) or (210) 531-8722

Performance Availability Website Address [Text]

rr_PerformanceAvailabilityWebSiteAddress

usaa.com

Performance Past Does Not Indicate Future [Text]

rr_PerformancePastDoesNotIndicateFuture

Remember, historical performance (before and after taxes) does not necessarily indicate what will happen in the future.

Bar Chart [Heading]

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RISK/RETURN BAR CHART
Annual Returns for Periods Ended December 31

Bar Chart Closing [Text Block]

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During the periods shown in the chart:	Returns	Quarter ended
Highest Quarter Return	5.60%	March 31, 2017
Lowest Quarter Return	-7.95%	September 30, 2015
Year-to-Date Return	-1.33%	March 31, 2018

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. In certain situations, the return after taxes on distributions and sale of fund shares may be higher than the other return amounts. A higher after-tax return may result when a capital loss occurs upon redemption and translates into an assumed tax deduction that benefits the shareholder. The actual after-tax returns depend on your tax situation and may differ from those shown. If you hold your shares through a tax-deferred arrangement, such as an individual retirement account (IRA) or 401(k) plan, the after-tax returns shown in the table are not relevant to you.

Performance Table Heading

rr_PerformanceTableHeading

AVERAGE ANNUAL TOTAL RETURNS
For Periods Ended December 31, 2017

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.

Performance Table Not Relevant to Tax Deferred

rr_PerformanceTableNotRelevantToTaxDeferred

If you hold your shares through a tax-deferred arrangement, such as an individual retirement account (IRA) or 401(k) plan, the after-tax returns shown in the table are not relevant to you.

Performance Table Explanation after Tax Higher

rr_PerformanceTableExplanationAfterTaxHigher

In certain situations, the return after taxes on distributions and sale of fund shares may be higher than the other return amounts. A higher after-tax return may result when a capital loss occurs upon redemption and translates into an assumed tax deduction that benefits the shareholder.

Target Retirement 2060 Fund | None or same as Fund Name

Risk/Return:

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(fees paid directly from your investment)

rr_ShareholderFeeOther

none

Management Fee

rr_ManagementFeesOverAssets

none

Distribution and/or Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

none

Other Expenses

rr_OtherExpensesOverAssets

0.29%

Acquired Fund Fees and Expenses

rr_AcquiredFundFeesAndExpensesOverAssets

0.80%

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

1.09%

^[1]

Reimbursement from Adviser

rr_FeeWaiverOrReimbursementOverAssets

(0.19%)

^[2]

Total Annual Fund Operating Expenses after Reimbursement

rr_NetExpensesOverAssets

0.90%

1 Year

rr_ExpenseExampleYear01

$ 92

3 Years

rr_ExpenseExampleYear03

328

5 Years

rr_ExpenseExampleYear05

582

10 Years

rr_ExpenseExampleYear10

$ 1,312

2014

rr_AnnualReturn2014

2.91%

2015

rr_AnnualReturn2015

(2.47%)

2016

rr_AnnualReturn2016

8.80%

2017

rr_AnnualReturn2017

19.51%

Year to Date Return, Label

rr_YearToDateReturnLabel

Year-to-Date Return

Bar Chart, Year to Date Return, Date

rr_BarChartYearToDateReturnDate

Mar. 31, 2018

Bar Chart, Year to Date Return

rr_BarChartYearToDateReturn

(1.33%)

Highest Quarterly Return, Label

rr_HighestQuarterlyReturnLabel

Highest Quarter Return

Highest Quarterly Return, Date

rr_BarChartHighestQuarterlyReturnDate

Mar. 31, 2017

Highest Quarterly Return

rr_BarChartHighestQuarterlyReturn

5.60%

Lowest Quarterly Return, Label

rr_LowestQuarterlyReturnLabel

Lowest Quarter Return

Lowest Quarterly Return, Date

rr_BarChartLowestQuarterlyReturnDate

Sep. 30, 2015

Lowest Quarterly Return

rr_BarChartLowestQuarterlyReturn

(7.95%)

Target Retirement 2060 Fund | Return Before Taxes | None or same as Fund Name

Risk/Return:

rr_RiskReturnAbstract

Past 1 Year

rr_AverageAnnualReturnYear01

19.51%

Since Inception

rr_AverageAnnualReturnSinceInception

8.35%

Inception Date

rr_AverageAnnualReturnInceptionDate

Jul. 12, 2013

Target Retirement 2060 Fund | Return After Taxes on Distributions | None or same as Fund Name

Risk/Return:

rr_RiskReturnAbstract

Past 1 Year

rr_AverageAnnualReturnYear01

18.21%

Since Inception

rr_AverageAnnualReturnSinceInception

7.55%

Target Retirement 2060 Fund | Return After Taxes on Distributions and Sale of Fund Shares | None or same as Fund Name

Risk/Return:

rr_RiskReturnAbstract

Past 1 Year

rr_AverageAnnualReturnYear01

11.66%

Since Inception

rr_AverageAnnualReturnSinceInception

6.35%

Target Retirement 2060 Fund | S&P Target Date 2060 Index (reflects no deduction for fees, expenses, or taxes)

Risk/Return:

rr_RiskReturnAbstract

Past 1 Year

rr_AverageAnnualReturnYear01

20.87%

Since Inception

rr_AverageAnnualReturnSinceInception

10.15%

Inception Date

rr_AverageAnnualReturnInceptionDate

Jul. 12, 2013

[1] The Total Annual Fund Operating Expenses for the Fund may not correlate to the ratio of expenses to average daily net assets shown in the financial highlights, which reflect the operating expenses of the Fund and do not include Acquired Fund Fees and Expenses.

[2] The Investment Adviser has agreed, through April 30, 2019, to make payments or waive management, administration, and other fees to limit the expenses of the Fund so that the Total Annual Fund Operating Expenses (exclusive of commission recapture, expense offset arrangements, acquired fund fees and expenses, and extraordinary expenses) do not exceed an annual rate of 0.10% of the Fund's average daily net assets. This reimbursement arrangement may not be changed or terminated during this time period without approval of the Fund's Board of Trustees and may be changed or terminated by Investment Adviser at any time after April 30, 2019.

XML

Label	Element	Value
Risk/Return:	rr_RiskReturnAbstract
Registrant Name	dei_EntityRegistrantName	USAA MUTUAL FUNDS TRUST
Prospectus Date	rr_ProspectusDate	May 01, 2018
Document Creation Date	dei_DocumentCreationDate	May 01, 2018