S000005599 [Member] Expense Example - Wilmington New York Municipal Bond Fund	Apr. 30, 2026 USD ($)
Class A
Prospectus [Line Items]
Expense Example, with Redemption, 1 Year	$ 529
Expense Example, with Redemption, 3 Years	887
Expense Example, with Redemption, 5 Years	1,268
Expense Example, with Redemption, 10 Years	2,336
Class I
Prospectus [Line Items]
Expense Example, with Redemption, 1 Year	57
Expense Example, with Redemption, 3 Years	326
Expense Example, with Redemption, 5 Years	616
Expense Example, with Redemption, 10 Years	$ 1,440

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Form N-1A
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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Form N-1A
-Section 1
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