v3.26.1
S000005649 [Member] Expense Example - Wilmington U.S. Treasury Money Market Fund
Apr. 30, 2026
USD ($)
Select Class Shares  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year $ 33
Expense Example, with Redemption, 3 Years 136
Expense Example, with Redemption, 5 Years 248
Expense Example, with Redemption, 10 Years 577
Service Class Shares  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 67
Expense Example, with Redemption, 3 Years 224
Expense Example, with Redemption, 5 Years 395
Expense Example, with Redemption, 10 Years 889
Administrative Class Shares  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 61
Expense Example, with Redemption, 3 Years 218
Expense Example, with Redemption, 5 Years 389
Expense Example, with Redemption, 10 Years 883
Institutional Class  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 26
Expense Example, with Redemption, 3 Years 96
Expense Example, with Redemption, 5 Years 173
Expense Example, with Redemption, 10 Years 399
Preferred Institutional Class  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 16
Expense Example, with Redemption, 3 Years 65
Expense Example, with Redemption, 5 Years 118
Expense Example, with Redemption, 10 Years $ 274