Alger Spectra Fund Expense Example - Class A C Shares [Member] - Alger Spectra Fund |
Oct. 31, 2025
USD ($)
|
|---|---|
| Class A | |
| Prospectus [Line Items] | |
| Expense Example, with Redemption, 1 Year | $ 672 |
| Expense Example, with Redemption, 3 Years | 983 |
| Expense Example, with Redemption, 5 Years | 1,315 |
| Expense Example, with Redemption, 10 Years | 2,253 |
| Class C | |
| Prospectus [Line Items] | |
| Expense Example, with Redemption, 1 Year | 333 |
| Expense Example, with Redemption, 3 Years | 718 |
| Expense Example, with Redemption, 5 Years | 1,230 |
| Expense Example, with Redemption, 10 Years | $ 2,636 |