Alger Mid Cap Growth Institutional Fund Expense Example - Class I R Shares [Member] - Alger Mid Cap Growth Institutional Fund |
Oct. 31, 2025
USD ($)
|
|---|---|
| Class I | |
| Prospectus [Line Items] | |
| Expense Example, with Redemption, 1 Year | $ 129 |
| Expense Example, with Redemption, 3 Years | 421 |
| Expense Example, with Redemption, 5 Years | 745 |
| Expense Example, with Redemption, 10 Years | 1,661 |
| Class R | |
| Prospectus [Line Items] | |
| Expense Example, with Redemption, 1 Year | 190 |
| Expense Example, with Redemption, 3 Years | 588 |
| Expense Example, with Redemption, 5 Years | 1,011 |
| Expense Example, with Redemption, 10 Years | $ 2,190 |