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Risk/Return: rr_RiskReturnAbstract  
Registrant Name dei_EntityRegistrantName WILMINGTON FUNDS
Prospectus Date rr_ProspectusDate Aug. 31, 2018
Wilmington U.S. Treasury Money Market Fund  
Risk/Return: rr_RiskReturnAbstract  
Risk/Return [Heading] rr_RiskReturnHeading WILMINGTON U.S. TREASURY MONEY MARKET FUND SUMMARY
Objective [Heading] rr_ObjectiveHeading Investment Goal
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock The Fund seeks to provide current income while maintaining liquidity and stability of principal.
Expense [Heading] rr_ExpenseHeading Fees and Expenses
Expense Narrative [Text Block] rr_ExpenseNarrativeTextBlock This table describes the fees and expenses that you may pay if you buy and hold the Fund’s Service Class Shares, Select Class Shares and Administrative Class Shares.
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 August 31, 2019
Expense Example [Heading] rr_ExpenseExampleHeading Example
Expense Example Narrative [Text Block] rr_ExpenseExampleNarrativeTextBlock This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds.

The Example assumes that you invest $10,000 in the Fund’s Service Class Shares, Select Class Shares and Administrative Class Shares for the time periods indicated and then redeem all of your Shares at the end of those periods. The Example also assumes that your investment has a 5% return each year and that the Fund’s operating expenses remain the same. The costs for the Fund reflect the net expenses of the Fund that result from the fee waiver/expense reimbursement in the first year only. Although your actual costs and returns may be higher or lower, based on these assumptions your costs would be:
Strategy [Heading] rr_StrategyHeading Principal Investment Strategies of the Fund
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock The Fund operates as a “Government Money Market Fund,” as defined in Rule 2a-7 under the Investment Company Act of 1940, as amended. This means that the Fund invests at least 99.5% of its total assets in (1) U.S. government securities, (2) repurchase agreements that are collateralized fully by U.S. government securities or cash, (3) cash, and/or (4) other money market mutual funds that operate as Government Money Market Funds. Under normal circumstances, the Fund invests at least 80% of its net assets in U.S. government securities and repurchase agreements that are fully collateralized by U.S. government securities. In contrast to the Fund’s 99.5% policy, the Fund’s 80% policy does not include cash. While the Board of Trustees may elect to impose a fee upon the sale of your shares or temporarily suspend your ability to sell shares in the future if the Fund’s liquidity falls below required minimums because of market conditions or other factors, the Board has not elected to do so at this time. Should the Board elect to do so, such change would only become effective after shareholders were provided with specific advance notice of the change in the Fund’s policy and provided with the opportunity to redeem their shares in accordance with Rule 2a-7 before the policy change became effective.

In selecting securities for the Fund, the investment advisor considers factors such as current yield, the anticipated level of interest rates, and the maturity of the instrument relative to the maturity of the entire Fund. In addition, the Fund may purchase only securities that meet certain SEC requirements relating to maturity, diversification and credit quality, and must meet certain SEC requirements relating to portfolio liquidity. Under these requirements, the Fund’s securities must have remaining maturities of 397 days or less, and the Fund must have a dollar-weighted average maturity of 60 days or less and a dollar-weighted average life of 120 days or less.
Risk [Heading] rr_RiskHeading Principal Risks of Investing in the Fund
Risk Narrative [Text Block] rr_RiskNarrativeTextBlock You could lose money by investing in the Fund. Although the Fund seeks to preserve the value of your investment at $1.00 per share, it cannot guarantee it will do so. An investment in the Fund is not a deposit of M&T Bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. The investment advisor has no legal obligation to provide financial support to the Fund, and you should not expect that the investment advisor will provide financial support to the Fund at any time.

The primary factors that may reduce the Fund’s returns include:
  • Credit Risk. There is a possibility that issuers of securities in which the Fund invests may default in the payment of interest or principal on the securities when due, which would cause the Fund to lose money.
  • Interest Rate Risk. The risk posed by the fact that prices of fixed income securities rise and fall inversely in response to interest rate changes. For instance, a rise in interest rate causes a fall in the value of a fixed income securities. In addition, this risk increases with the length of the maturity of the fixed income security. Accordingly, the yield earned by a Fund will vary with changes in interest rates. Also, when interest rates fall, the price of mortgage-backed securities may not rise to as great an extent as that of other fixed income securities. Duration is a measure of the expected life of a debt security that is used to determine the sensitivity of the security’s price to changes in interest rates. Generally, the longer the Fund’s duration, the more sensitive the Fund will be to changes in interest rates.
  • Investments in Other Money Market Mutual Funds Risk. To the extent that the Fund invests in shares of other money market mutual funds, its performance is directly tied to the performance of such other funds. If one of these other money market mutual funds fails to meet its objective, the Fund’s performance could be negatively affected. In addition, Fund shareholders will pay a proportionate share of the fees and expenses of such other money market mutual funds (including applicable management, administration and custodian fees) as well as the Fund’s direct expenses. Any such other money market mutual fund will not charge any front-end sales loads, contingent deferred sales charges or Rule 12b-1 fees.
  • Repurchase Agreements Risk. A repurchase agreement exposes the Fund to the risk that the party that sells the security may default on its obligation to repurchase it. The Fund may lose money if it cannot sell the security at the agreed-upon time and price or the security loses value before it can be sold.
  • U.S. Government Securities Risk. Not all obligations of the U.S. government, its agencies and instrumentalities are backed by the full faith and credit of the United States. Some obligations are backed only by the credit of the issuing agency or instrumentality, and in some cases there may be some risk of default by the issuer. Even if a security is backed by the U.S. Treasury or the full faith and credit of the United States, such guarantee applies only to the timely payment of interest and principal. Neither the U.S. government nor its agencies guarantees the market value of their securities, and interest rate changes, prepayments and other factors may affect the value of U.S. government securities.
Risk Lose Money [Text] rr_RiskLoseMoney You could lose money by investing in the Fund.
Risk Money Market Fund [Text] rr_RiskMoneyMarketFund Although the Fund seeks to preserve the value of your investment at $1.00 per share, it cannot guarantee it will do so.
Risk Not Insured Depository Institution [Text] rr_RiskNotInsuredDepositoryInstitution An investment in the Fund is not a deposit of M&T 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 Information
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock The bar chart and table immediately following show the variability of the Fund’s returns and are meant to provide some indication of the risks of investing in the Fund by showing changes in the Fund’s performance from year to year, with respect to its Service Class (formerly Class S) Shares, and by showing how the Fund’s average annual total returns for 1, 5 and 10 years or life of the Fund compare with those of broad measures of market performance. The Fund’s past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future. The table shows returns for the Fund’s broad-based market indexes, the iMoneyNet, Inc. Treasury and Repo Retail Average and the iMoneyNet, Inc. Treasury and Repo Institutional Average. Updated performance information is available at www.wilmingtonfunds.com.

Effective January 20, 2012, Class S Shares were redesignated Service Class Shares, Class I Shares and Class A Shares were combined and redesignated Select Class Shares, and Class I2 Shares were redesignated Administrative Class Shares. Performance for Service Class Select Class and Administrative Class Shares prior to redesignation is based on the previous performance of Class S Shares, Class A Shares, and Class I2 Shares, respectively, and has not been adjusted to reflect differences in expenses prior to the redesignation of the classes. Administrative Class Shares are subject to a shareholder services fee up to 0.25 % of the Fund’s average daily net assets.
Performance Information Illustrates Variability of Returns [Text] rr_PerformanceInformationIllustratesVariabilityOfReturns The bar chart and table immediately following show the variability of the Fund’s returns and are meant to provide some indication of the risks of investing in the Fund by showing changes in the Fund’s performance from year to year, with respect to its Service Class (formerly Class S) Shares, and by showing how the Fund’s average annual total returns for 1, 5 and 10 years or life of the Fund compare with those of broad measures of market performance.
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress www.wilmingtonfunds.com
Performance Past Does Not Indicate Future [Text] rr_PerformancePastDoesNotIndicateFuture The Fund’s past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future.
Bar Chart [Heading] rr_BarChartHeading Annual Total Returns – Service Class Shares
Performance Over 10 Years
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock

Best Quarter

0.49%

3/31/2008

 

Worst Quarter

0.00%

3/31/2014

 


The Fund’s Service Class Shares total return for the six-month period from January 1, 2018 to June 30, 2018 was 0.41%.
Performance Table Heading rr_PerformanceTableHeading Average Annual Total Returns
(For the periods ended December 31, 2017)
Performance Table Closing [Text Block] rr_PerformanceTableClosingTextBlock You may go to www.wilmingtonfunds.com or call the Fund at 1-800-836-2211 for the current 7-Day Net Yield.
Money Market Seven Day Yield Phone rr_MoneyMarketSevenDayYieldPhone 1-800-836-2211
Wilmington U.S. Treasury Money Market Fund | Service Class  
Risk/Return: rr_RiskReturnAbstract  
Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (Load) rr_MaximumDeferredSalesChargeOverOther none
Maximum Sales Charge (Load) Imposed on Reinvested Dividends (and other Distributions) rr_MaximumSalesChargeOnReinvestedDividendsAndDistributionsOverOther none
Redemption Fee rr_RedemptionFeeOverRedemption none
Exchange Fee rr_ExchangeFeeOverRedemption none
Management Fee rr_ManagementFeesOverAssets 0.25%
Distribution and/or Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Other Expenses rr_OtherExpensesOverAssets 0.34%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 0.84%
Fee Waivers and/or Expense Reimbursements rr_FeeWaiverOrReimbursementOverAssets (0.09%) [1]
Total Annual Fund Operating Expenses After Fee Waiver/Expense Reimbursement rr_NetExpensesOverAssets 0.75%
1 Year rr_ExpenseExampleYear01 $ 77
3 Years rr_ExpenseExampleYear03 259
5 Years rr_ExpenseExampleYear05 457
10 Years rr_ExpenseExampleYear10 $ 1,029
2008 rr_AnnualReturn2008 1.02%
2009 rr_AnnualReturn2009 0.02%
2010 rr_AnnualReturn2010 0.01%
2011 rr_AnnualReturn2011 0.01%
2012 rr_AnnualReturn2012 0.01%
2013 rr_AnnualReturn2013 0.01%
2014 rr_AnnualReturn2014 none
2015 rr_AnnualReturn2015 none
2016 rr_AnnualReturn2016 0.02%
2017 rr_AnnualReturn2017 0.19%
Year to Date Return, Label rr_YearToDateReturnLabel total return
Bar Chart, Year to Date Return, Date rr_BarChartYearToDateReturnDate Jun. 30, 2018
Bar Chart, Year to Date Return rr_BarChartYearToDateReturn 0.41%
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Best Quarter
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Mar. 31, 2008
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 0.49%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Worst Quarter
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Mar. 31, 2014
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn none
1 Year rr_AverageAnnualReturnYear01 0.19%
5 Years rr_AverageAnnualReturnYear05 0.04%
10 Years rr_AverageAnnualReturnYear10 0.13%
Wilmington U.S. Treasury Money Market Fund | Select Class  
Risk/Return: rr_RiskReturnAbstract  
Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (Load) rr_MaximumDeferredSalesChargeOverOther none
Maximum Sales Charge (Load) Imposed on Reinvested Dividends (and other Distributions) rr_MaximumSalesChargeOnReinvestedDividendsAndDistributionsOverOther none
Redemption Fee rr_RedemptionFeeOverRedemption none
Exchange Fee rr_ExchangeFeeOverRedemption none
Management Fee rr_ManagementFeesOverAssets 0.25%
Distribution and/or Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses rr_OtherExpensesOverAssets 0.34%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 0.59%
Fee Waivers and/or Expense Reimbursements rr_FeeWaiverOrReimbursementOverAssets (0.24%) [1]
Total Annual Fund Operating Expenses After Fee Waiver/Expense Reimbursement rr_NetExpensesOverAssets 0.35%
1 Year rr_ExpenseExampleYear01 $ 36
3 Years rr_ExpenseExampleYear03 165
5 Years rr_ExpenseExampleYear05 305
10 Years rr_ExpenseExampleYear10 $ 715
1 Year rr_AverageAnnualReturnYear01 0.53%
5 Years rr_AverageAnnualReturnYear05 0.12%
10 Years rr_AverageAnnualReturnYear10 0.18%
Wilmington U.S. Treasury Money Market Fund | Administrative Class  
Risk/Return: rr_RiskReturnAbstract  
Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (Load) rr_MaximumDeferredSalesChargeOverOther none
Maximum Sales Charge (Load) Imposed on Reinvested Dividends (and other Distributions) rr_MaximumSalesChargeOnReinvestedDividendsAndDistributionsOverOther none
Redemption Fee rr_RedemptionFeeOverRedemption none
Exchange Fee rr_ExchangeFeeOverRedemption none
Management Fee rr_ManagementFeesOverAssets 0.25%
Distribution and/or Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Other Expenses rr_OtherExpensesOverAssets 0.34%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 0.84%
Fee Waivers and/or Expense Reimbursements rr_FeeWaiverOrReimbursementOverAssets (0.24%) [1]
Total Annual Fund Operating Expenses After Fee Waiver/Expense Reimbursement rr_NetExpensesOverAssets 0.60%
1 Year rr_ExpenseExampleYear01 $ 61
3 Years rr_ExpenseExampleYear03 244
5 Years rr_ExpenseExampleYear05 442
10 Years rr_ExpenseExampleYear10 $ 1,015
1 Year rr_AverageAnnualReturnYear01 0.29%
5 Years rr_AverageAnnualReturnYear05 0.07%
10 Years rr_AverageAnnualReturnYear10 0.17%
Wilmington U.S. Treasury Money Market Fund | iMoneyNet, Inc. Treasury and Repo Retail Average (reflects no deduction for taxes)  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 0.27%
5 Years rr_AverageAnnualReturnYear05 0.06%
10 Years rr_AverageAnnualReturnYear10 0.15%
Wilmington U.S. Treasury Money Market Fund | iMoneyNet, Inc. Treasury and Repo Institutional Average (reflects no deduction for taxes)  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 0.56%
5 Years rr_AverageAnnualReturnYear05 0.14%
10 Years rr_AverageAnnualReturnYear10 0.23%
[1] The Fund’s Advisor, distributor and shareholder services provider have agreed to waive their fees and/or reimburse expenses so that the total annual fund operating expenses paid by the Fund’s Service, Select and Administrative Class Shares will not exceed 0.75%, 0.35% and 0.60%, respectively, not including taxes, or other extraordinary expenses. This waiver may be amended or withdrawn after August 31, 2019, or with the agreement of the Fund’s Board of Trustees.