Alger Health Sciences Fund Expense Example - Class A C Shares [Member] - Alger Health Sciences Fund |
Oct. 31, 2025
USD ($)
|
|---|---|
| Class A | |
| Prospectus [Line Items] | |
| Expense Example, with Redemption, 1 Year | $ 638 |
| Expense Example, with Redemption, 3 Years | 877 |
| Expense Example, with Redemption, 5 Years | 1,135 |
| Expense Example, with Redemption, 10 Years | 1,871 |
| Class C | |
| Prospectus [Line Items] | |
| Expense Example, with Redemption, 1 Year | 299 |
| Expense Example, with Redemption, 3 Years | 615 |
| Expense Example, with Redemption, 5 Years | 1,057 |
| Expense Example, with Redemption, 10 Years | $ 2,285 |