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S000005649 [Member] Investment Risks - Wilmington U.S. Treasury Money Market Fund
Apr. 30, 2025
Interest Rate Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
    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. A decline in interest rates may cause issuers to prepay higher-yielding securities held by the Fund, resulting in the Fund reinvesting in securities with lower or negative yields, which may cause a decline in its income. A low interest rate environment may prevent the Fund from providing a positive yield or paying Fund expenses out of current income and could impair the Fund’s ability to maintain a stable NAV. Recent and potential future changes in government policy may affect interest rates, which may have unpredictable effects on markets, may result in heightened market volatility and may detract from the Fund’s ability to achieve its investment objective. 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 [Member]  
Prospectus [Line Items]  
Risk [Text Block]
    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 [Member]  
Prospectus [Line Items]  
Risk [Text Block]
    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 [Member]  
Prospectus [Line Items]  
Risk [Text Block]
   
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.
Credit Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
    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.
Risk Lose Money [Member]  
Prospectus [Line Items]  
Risk [Text Block] You could lose money by investing in the Fund.
Risk Not Insured Depository Institution [Member]  
Prospectus [Line Items]  
Risk [Text Block] An investment in the Fund is not a bank account, 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.
Risk Money Market Fund May Not Preserve Dollar [Member]  
Prospectus [Line Items]  
Risk [Text Block] Although the Fund seeks to preserve the value of your investment at $1.00 per share, it cannot guarantee it will do so.
Risk Money Market Fund Sponsor May Not Provide Support [Member]  
Prospectus [Line Items]  
Risk [Text Block] The investment advisor is not required to reimburse the Fund for losses, and you should not expect that the investment advisor will provide financial support to the Fund at any time, including during periods of market stress.