Alger Small Cap Growth Fund Expense Example, No Redemption - Class A B C Shares [Member] - Alger Small Cap Growth Fund |
Oct. 31, 2025
USD ($)
|
|---|---|
| Class B | |
| Prospectus [Line Items] | |
| Expense Example, No Redemption, 1 Year | $ 208 |
| Expense Example, No Redemption, 3 Years | 643 |
| Expense Example, No Redemption, 5 Years | 1,103 |
| Expense Example, No Redemption, 10 Years | 2,379 |
| Class C | |
| Prospectus [Line Items] | |
| Expense Example, No Redemption, 1 Year | 215 |
| Expense Example, No Redemption, 3 Years | 664 |
| Expense Example, No Redemption, 5 Years | 1,139 |
| Expense Example, No Redemption, 10 Years | $ 2,452 |