Annual Total Returns |
Dec. 31, 2025 |
Dec. 31, 2024 |
Dec. 31, 2023 |
Dec. 31, 2022 |
Dec. 31, 2021 |
Dec. 31, 2020 |
Dec. 31, 2019 |
Dec. 31, 2018 |
Dec. 31, 2017 |
Dec. 31, 2016 |
|---|---|---|---|---|---|---|---|---|---|---|
| DELAWARE GROUP EQUITY FUNDS IV - A, C, R, and Institutional | Nomura Healthcare Fund | A | ||||||||||
| Prospectus [Line Items] | ||||||||||
| Annual Return [Percent] | 22.09% | 8.49% | 4.20% | (1.32%) | (5.32%) | 11.14% | 31.53% | (0.84%) | 31.96% | (4.34%) |