Alger Small Cap Focus Fund Annual Total Returns |
12 Months Ended | |||||||
|---|---|---|---|---|---|---|---|---|
Dec. 31, 2025 |
Dec. 31, 2024 |
Dec. 31, 2023 |
Dec. 31, 2022 |
Dec. 31, 2021 |
Dec. 31, 2020 |
Dec. 31, 2019 |
Dec. 31, 2018 |
|
| Class Y Shares [Member] | Alger Small Cap Focus Fund | Class Y | ||||||||
| Prospectus [Line Items] | ||||||||
| Annual Return [Percent] | 7.41% | 14.01% | 10.35% | (37.42%) | (13.95%) | 53.75% | 24.59% | 14.51% |