Alger Dynamic Opportunities Fund Average Annual Total Returns - Class A C Shares [Member] |
12 Months Ended | 60 Months Ended | 120 Months Ended | |
|---|---|---|---|---|
Oct. 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% | 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 A | ||||
| Prospectus [Line Items] | ||||
| Average Annual Return, Percent | 0.64% | 2.92% | 8.13% | |
| Performance Inception Date | Nov. 02, 2009 | |||
| Class A | After Taxes on Distributions | ||||
| Prospectus [Line Items] | ||||
| Average Annual Return, Percent | 0.61% | 2.64% | 7.49% | |
| Class A | After Taxes on Distributions and Sales | ||||
| Prospectus [Line Items] | ||||
| Average Annual Return, Percent | 0.39% | 2.22% | 6.41% | |
| Class C | ||||
| Prospectus [Line Items] | ||||
| Average Annual Return, Percent | 4.40% | 3.24% | 8.04% | |
| Performance Inception Date | Dec. 29, 2010 |