Alger Spectra Fund Expense Example, No Redemption - Class A C Shares [Member] - Alger Spectra Fund - Class C |
Oct. 31, 2025
USD ($)
|
|---|---|
| Prospectus [Line Items] | |
| Expense Example, No Redemption, 1 Year | $ 233 |
| Expense Example, No Redemption, 3 Years | 718 |
| Expense Example, No Redemption, 5 Years | 1,230 |
| Expense Example, No Redemption, 10 Years | $ 2,636 |