Alger Small Cap Growth Fund Expense Example - Class A B C Shares [Member] - Alger Small Cap Growth Fund |
Oct. 31, 2025
USD ($)
|
|---|---|
| Class A | |
| Prospectus [Line Items] | |
| Expense Example, with Redemption, 1 Year | $ 652 |
| Expense Example, with Redemption, 3 Years | 921 |
| Expense Example, with Redemption, 5 Years | 1,210 |
| Expense Example, with Redemption, 10 Years | 2,032 |
| Class B | |
| Prospectus [Line Items] | |
| Expense Example, with Redemption, 1 Year | 708 |
| Expense Example, with Redemption, 3 Years | 943 |
| Expense Example, with Redemption, 5 Years | 1,303 |
| Expense Example, with Redemption, 10 Years | 2,379 |
| Class C | |
| Prospectus [Line Items] | |
| Expense Example, with Redemption, 1 Year | 315 |
| Expense Example, with Redemption, 3 Years | 664 |
| Expense Example, with Redemption, 5 Years | 1,139 |
| Expense Example, with Redemption, 10 Years | $ 2,452 |