Alger Mid Cap Growth Fund Expense Example - Class A B C Shares [Member] - Alger Mid Cap Growth Fund |
Oct. 31, 2025
USD ($)
|
|---|---|
| Class A | |
| Prospectus [Line Items] | |
| Expense Example, with Redemption, 1 Year | $ 643 |
| Expense Example, with Redemption, 3 Years | 892 |
| Expense Example, with Redemption, 5 Years | 1,160 |
| Expense Example, with Redemption, 10 Years | 1,925 |
| Class B | |
| Prospectus [Line Items] | |
| Expense Example, with Redemption, 1 Year | 697 |
| Expense Example, with Redemption, 3 Years | 909 |
| Expense Example, with Redemption, 5 Years | 1,247 |
| Expense Example, with Redemption, 10 Years | 2,264 |
| Class C | |
| Prospectus [Line Items] | |
| Expense Example, with Redemption, 1 Year | 307 |
| Expense Example, with Redemption, 3 Years | 640 |
| Expense Example, with Redemption, 5 Years | 1,098 |
| Expense Example, with Redemption, 10 Years | $ 2,369 |