Alger Small Cap Growth Institutional Fund Expense Example - Class I R Shares [Member] - Alger Small Cap Growth Institutional Fund |
Oct. 31, 2025
USD ($)
|
|---|---|
| Class I | |
| Prospectus [Line Items] | |
| Expense Example, with Redemption, 1 Year | $ 142 |
| Expense Example, with Redemption, 3 Years | 440 |
| Expense Example, with Redemption, 5 Years | 761 |
| Expense Example, with Redemption, 10 Years | 1,669 |
| Class R | |
| Prospectus [Line Items] | |
| Expense Example, with Redemption, 1 Year | 189 |
| Expense Example, with Redemption, 3 Years | 585 |
| Expense Example, with Redemption, 5 Years | 1,006 |
| Expense Example, with Redemption, 10 Years | $ 2,180 |