Alger Mid Cap Focus Fund Annual Total Returns |
12 Months Ended | |||
|---|---|---|---|---|
Dec. 31, 2025 |
Dec. 31, 2024 |
Dec. 31, 2023 |
Dec. 31, 2022 |
|
| Class Y Shares [Member] | Alger Mid Cap Focus Fund | Class Y | ||||
| Prospectus [Line Items] | ||||
| Annual Return [Percent] | 15.53% | 32.02% | 17.08% | (37.18%) |