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Risk/Return: rr_RiskReturnAbstract  
Registrant Name dei_EntityRegistrantName WILMINGTON FUNDS
Prospectus Date rr_ProspectusDate Aug. 31, 2018
Wilmington Large-Cap Strategy Fund  
Risk/Return: rr_RiskReturnAbstract  
Risk/Return [Heading] rr_RiskReturnHeading WILMINGTON LARGE-CAP STRATEGY FUND SUMMARY
Objective [Heading] rr_ObjectiveHeading Investment Goal
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock The Fund seeks to achieve long-term capital appreciation.
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 Class I 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
Portfolio Turnover [Heading] rr_PortfolioTurnoverHeading Portfolio Turnover
Portfolio Turnover [Text Block] rr_PortfolioTurnoverTextBlock The Fund pays transaction costs, such as 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 Fund shares are held in a taxable account. These costs, which are not reflected in annual fund operating expenses or in the example, affect the Fund’s performance. During the most recent fiscal year, the Fund’s portfolio turnover rate was 15% of the average value of the 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.

The Example assumes that you invest $10,000 in the Fund’s Class I 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 Under normal circumstances, the Fund invests at least 80% of the value of its net assets in a diversified portfolio of U.S. equity (or equity-related) securities of large-cap companies (primarily common stocks). Large-cap companies are companies that have a market capitalization at the time of purchase at least equal to that of the smallest company in the Russell 1000 Index ($2.5 billion as of May 11, 2018), or at least equal to that of the smallest company expected to be included in the Russell 1000 Index after its next scheduled reconstitution.

The Fund’s investment advisor determines the tactical allocation of the Fund’s assets based on forecasts of asset risk and return profiles derived from a combination of fundamental, quantitative and macroeconomic inputs. The tactical allocations may be based on one or more factors, such as economic sector, industry, investment style (e.g., growth or value), market capitalization (e.g., mega-cap or large/midcap), or security valuation measure (e.g., price/earnings ratio). Currently, the investment advisor’s tactical allocation is based primarily on the economic sectors of the Fund’s benchmark index (Russell 1000 Index).

Once the investment advisor determines the tactical allocations, the sub-advisor uses quantitative models to construct a portfolio by investing in a representative sample of securities having the factor characteristic, or belonging to the sector/industry of the benchmark index (or another index of large-capitalization companies) to which the investment adviser has made an allocation, weighted in accordance with that allocation. The return for each component of the portfolio is intended to correlate closely with the return for the corresponding component of the applicable benchmark index. The sub-advisor will use quantitative analytical tools to rebalance the portfolio and to make buy and sell decisions on individual securities. There is no assurance that the sub-advisor’s investment performance will equal or exceed that of the benchmark index.
Risk [Heading] rr_RiskHeading Principal Risks of Investing in the Fund
Risk Narrative [Text Block] rr_RiskNarrativeTextBlock All mutual funds take investment risks. Therefore, it is possible to lose money by investing in the Fund. The primary factors that may reduce the Fund’s returns include:
  • Asset Allocation Risk. The Advisor’s allocation decisions among various categories of investments may not anticipate market trends successfully. The Advisor may make less than optimal or poor asset allocation decisions. The Advisor attempts to identify investment allocations that will provide consistent, quality performance for the Fund, but there is no guarantee that the allocations will produce the desired results. The Fund could underperform in comparison to other funds with a similar benchmark or similar objectives and investment strategies and you could lose money on your investment in the Fund as a result of these allocation decisions.
  • Style/Sector/Factor Risk. Different investment styles and factors tend to shift in and out of favor depending on market conditions and investor sentiment. The Fund’s approach to investing on the basis of sector and/or industry selection, factor selection, or style could cause it to underperform other stock funds that employ a different basis for investing.
  • Stock Market Risk. The value of equity securities in the Fund’s portfolio will fluctuate and, as a result, the Fund’s share price may decline suddenly or over a sustained period of time.
As with any mutual fund investment, loss of money is a risk of investing. An investment in the Fund is not a deposit in a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.
Risk Lose Money [Text] rr_RiskLoseMoney All mutual funds take investment risks. Therefore, it is possible to lose money by investing in the Fund.
Risk Not Insured Depository Institution [Text] rr_RiskNotInsuredDepositoryInstitution An investment in the Fund is not a deposit in a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading Performance Information
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock The returns presented for the Fund for periods prior to March 9, 2012 reflect the performance of a former series of WT Mutual Fund, also known as the Wilmington Large-Cap Strategy Fund (the “Predecessor Fund”). The Fund adopted the performance of the Predecessor Fund as the result of a reorganization in which the Fund acquired all of the assets, subject to the liabilities, of the Predecessor Fund. The Fund and the Predecessor Fund have substantially similar investment goals and strategies.

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 Class I Shares, and by showing how the Fund’s average annual total returns for 1, 5 and 10 years or the life of the Fund compare with those of a broad measure 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. Updated performance information is available at www.wilmingtonfunds.com.
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 Class I Shares, and by showing how the Fund’s average annual total returns for 1, 5 and 10 years or the life of the Fund compare with those of a broad measure 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 – Class I Shares
Performance Over 10 Years
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock

Best Quarter

15.31%

6/30/2009

 

Worst Quarter

(23.06)%

12/31/2008

 


The Fund’s Class I Shares total return for the six-month period from January 1, 2018 to June 30, 2018 was 2.90%.
Performance Table Heading rr_PerformanceTableHeading Average Annual Total Returns
(For the periods ended December 31, 2017)
Performance Table Uses Highest Federal Rate rr_PerformanceTableUsesHighestFederalRate When after-tax returns are calculated, it is assumed that the shareholder was in the highest individual federal marginal income tax bracket at the time of each distribution of income or capital gains or upon redemption. State and local income taxes are not reflected in the calculations.
Performance Table Not Relevant to Tax Deferred rr_PerformanceTableNotRelevantToTaxDeferred Please note that after-tax returns are not relevant for a shareholder who holds Fund shares in a tax-advantaged account, such as an individual retirement account or a 401(k) plan.
Performance Table Narrative rr_PerformanceTableNarrativeTextBlock After-tax returns depend on your tax situation and may differ from those shown in the preceding table. When after-tax returns are calculated, it is assumed that the shareholder was in the highest individual federal marginal income tax bracket at the time of each distribution of income or capital gains or upon redemption. State and local income taxes are not reflected in the calculations. Please note that after-tax returns are not relevant for a shareholder who holds Fund shares in a tax-advantaged account, such as an individual retirement account or a 401(k) plan.
Wilmington Large-Cap Strategy Fund | Class I  
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 0.50%
Distribution and/or Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses rr_OtherExpensesOverAssets 0.40%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 0.90%
Fee Waivers and/or Expense Reimbursements rr_FeeWaiverOrReimbursementOverAssets (0.65%) [1]
Total Annual Fund Operating Expenses After Fee Waiver/Expense Reimbursement rr_NetExpensesOverAssets 0.25%
1 Year rr_ExpenseExampleYear01 $ 26
3 Years rr_ExpenseExampleYear03 222
5 Years rr_ExpenseExampleYear05 435
10 Years rr_ExpenseExampleYear10 $ 1,048
2008 rr_AnnualReturn2008 (38.35%)
2009 rr_AnnualReturn2009 24.40%
2010 rr_AnnualReturn2010 13.25%
2011 rr_AnnualReturn2011 1.09%
2012 rr_AnnualReturn2012 16.05%
2013 rr_AnnualReturn2013 32.78%
2014 rr_AnnualReturn2014 13.32%
2015 rr_AnnualReturn2015 2.21%
2016 rr_AnnualReturn2016 10.63%
2017 rr_AnnualReturn2017 21.98%
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 2.90%
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Best Quarter
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Jun. 30, 2009
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 15.31%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Worst Quarter
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Dec. 31, 2008
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (23.06%)
1 Year rr_AverageAnnualReturnYear01 21.98%
5 Years rr_AverageAnnualReturnYear05 15.72%
10 Years rr_AverageAnnualReturnYear10 7.78%
Wilmington Large-Cap Strategy Fund | Return After Taxes on Distributions | Class I  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 21.51%
5 Years rr_AverageAnnualReturnYear05 14.63%
10 Years rr_AverageAnnualReturnYear10 7.15%
Wilmington Large-Cap Strategy Fund | Return After Taxes on Distributions and Sale of Fund Shares | Class I  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 12.79%
5 Years rr_AverageAnnualReturnYear05 12.48%
10 Years rr_AverageAnnualReturnYear10 6.20%
Wilmington Large-Cap Strategy Fund | Russell 1000 Index (reflects no deduction for fees, expenses or taxes)  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 21.69%
5 Years rr_AverageAnnualReturnYear05 15.71%
10 Years rr_AverageAnnualReturnYear10 8.59%
[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 Class I Shares will not exceed 0.25%, not including the effects of 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.