Alger Dynamic Opportunities Fund Average Annual Total Returns - Class Z Shares [Member] |
12 Months Ended | 60 Months Ended | 111 Months Ended | 120 Months Ended | |
|---|---|---|---|---|---|
Oct. 31, 2025 |
Dec. 31, 2025 |
Dec. 31, 2025 |
Dec. 31, 2025 |
Dec. 31, 2025 |
|
| S&P 500 Index (reflects no deductions for fees, expenses or taxes)[Member] | |||||
| Prospectus [Line Items] | |||||
| Average Annual Return, Percent | 17.88% | 14.42% | 15.43% | 14.82% | |
| HFRI Equity Hedge (Total) Index (reflects no deductions for fees, expenses or taxes)[Member] | |||||
| Prospectus [Line Items] | |||||
| Average Annual Return, Percent | 19.71% | 8.54% | 6.09% | ||
| Class Z | |||||
| Prospectus [Line Items] | |||||
| Average Annual Return, Percent | 6.56% | 4.34% | 9.02% | ||
| Performance Inception Date | Dec. 29, 2010 | ||||
| Class Z | After Taxes on Distributions | |||||
| Prospectus [Line Items] | |||||
| Average Annual Return, Percent | 6.42% | 4.05% | 8.38% | ||
| Class Z | After Taxes on Distributions and Sales | |||||
| Prospectus [Line Items] | |||||
| Average Annual Return, Percent | 3.94% | 3.33% | 7.18% |