v3.26.1
Expense Example, No Redemption - DELAWARE GROUP EQUITY FUNDS IV - A, C, R, and Institutional - Nomura Healthcare Fund - C
Mar. 31, 2026
USD ($)
Prospectus [Line Items]  
Expense Example, No Redemption, 1 Year $ 199
Expense Example, No Redemption, 3 Years 626
Expense Example, No Redemption, 5 Years 1,078
Expense Example, No Redemption, 10 Years $ 2,334