v3.26.1
Expense Example, No Redemption - DELAWARE GROUP EQUITY FUNDS IV - A, C, R, and Institutional - C
Mar. 31, 2026
USD ($)
Nomura Asset Strategy Fund  
Prospectus [Line Items]  
Expense Example, No Redemption, 1 Year $ 190
Expense Example, No Redemption, 3 Years 588
Expense Example, No Redemption, 5 Years 1,011
Expense Example, No Redemption, 10 Years 2,190
Nomura Balanced Fund  
Prospectus [Line Items]  
Expense Example, No Redemption, 1 Year 176
Expense Example, No Redemption, 3 Years 570
Expense Example, No Redemption, 5 Years 990
Expense Example, No Redemption, 10 Years 2,159
Nomura Core Equity Fund  
Prospectus [Line Items]  
Expense Example, No Redemption, 1 Year 177
Expense Example, No Redemption, 3 Years 552
Expense Example, No Redemption, 5 Years 952
Expense Example, No Redemption, 10 Years 2,071
Nomura Global Growth Fund  
Prospectus [Line Items]  
Expense Example, No Redemption, 1 Year 188
Expense Example, No Redemption, 3 Years 623
Expense Example, No Redemption, 5 Years 1,085
Expense Example, No Redemption, 10 Years 2,363
Nomura International Core Equity Fund  
Prospectus [Line Items]  
Expense Example, No Redemption, 1 Year 179
Expense Example, No Redemption, 3 Years 615
Expense Example, No Redemption, 5 Years 1,077
Expense Example, No Redemption, 10 Years 2,356
Nomura Large Cap Growth Fund  
Prospectus [Line Items]  
Expense Example, No Redemption, 1 Year 167
Expense Example, No Redemption, 3 Years 536
Expense Example, No Redemption, 5 Years 930
Expense Example, No Redemption, 10 Years 2,033
Nomura Mid Cap Growth Fund  
Prospectus [Line Items]  
Expense Example, No Redemption, 1 Year 182
Expense Example, No Redemption, 3 Years 605
Expense Example, No Redemption, 5 Years 1,054
Expense Example, No Redemption, 10 Years 2,301
Nomura Mid Cap Income Opportunities Fund  
Prospectus [Line Items]  
Expense Example, No Redemption, 1 Year 185
Expense Example, No Redemption, 3 Years 618
Expense Example, No Redemption, 5 Years 1,078
Expense Example, No Redemption, 10 Years 2,351
Nomura Smid Cap Core Fund  
Prospectus [Line Items]  
Expense Example, No Redemption, 1 Year 190
Expense Example, No Redemption, 3 Years 640
Expense Example, No Redemption, 5 Years 1,116
Expense Example, No Redemption, 10 Years 2,432
Nomura Small Cap Growth Fund  
Prospectus [Line Items]  
Expense Example, No Redemption, 1 Year 188
Expense Example, No Redemption, 3 Years 623
Expense Example, No Redemption, 5 Years 1,085
Expense Example, No Redemption, 10 Years 2,363
Nomura Systematic Emerging Markets Equity Fund  
Prospectus [Line Items]  
Expense Example, No Redemption, 1 Year 181
Expense Example, No Redemption, 3 Years 658
Expense Example, No Redemption, 5 Years 1,162
Expense Example, No Redemption, 10 Years 2,548
Nomura Climate Solutions Fund  
Prospectus [Line Items]  
Expense Example, No Redemption, 1 Year 202
Expense Example, No Redemption, 3 Years 703
Expense Example, No Redemption, 5 Years 1,231
Expense Example, No Redemption, 10 Years 2,677
Nomura Natural Resources Fund  
Prospectus [Line Items]  
Expense Example, No Redemption, 1 Year 198
Expense Example, No Redemption, 3 Years 675
Expense Example, No Redemption, 5 Years 1,178
Expense Example, No Redemption, 10 Years 2,562
Nomura Real Estate Securities Fund  
Prospectus [Line Items]  
Expense Example, No Redemption, 1 Year 186
Expense Example, No Redemption, 3 Years 709
Expense Example, No Redemption, 5 Years 1,258
Expense Example, No Redemption, 10 Years 2,758
Nomura Science and Technology Fund  
Prospectus [Line Items]  
Expense Example, No Redemption, 1 Year 194
Expense Example, No Redemption, 3 Years 602
Expense Example, No Redemption, 5 Years 1,036
Expense Example, No Redemption, 10 Years 2,242
Nomura Global Bond Fund  
Prospectus [Line Items]  
Expense Example, No Redemption, 1 Year 170
Expense Example, No Redemption, 3 Years 575
Expense Example, No Redemption, 5 Years 1,005
Expense Example, No Redemption, 10 Years 2,203
Nomura High Income Fund  
Prospectus [Line Items]  
Expense Example, No Redemption, 1 Year 165
Expense Example, No Redemption, 3 Years 538
Expense Example, No Redemption, 5 Years 937
Expense Example, No Redemption, 10 Years $ 2,052