Alger Emerging Markets Fund Average Annual Total Returns - Class Z Shares [Member] |
12 Months Ended | 60 Months Ended | 120 Months Ended | |
|---|---|---|---|---|
Oct. 31, 2025 |
Dec. 31, 2025 |
Dec. 31, 2025 |
Dec. 31, 2025 |
|
| MSCI Emerging Markets Gross Index (reflects no deductions for fees, expenses or taxes)[Member] | ||||
| Prospectus [Line Items] | ||||
| Average Annual Return, Percent | 34.36% | 4.67% | 8.86% | |
| Class Z | ||||
| Prospectus [Line Items] | ||||
| Average Annual Return, Percent | 26.02% | 0.24% | 6.74% | |
| Performance Inception Date | Feb. 28, 2014 | |||
| Class Z | After Taxes on Distributions | ||||
| Prospectus [Line Items] | ||||
| Average Annual Return, Percent | 26.05% | 0.14% | 6.16% | |
| Class Z | After Taxes on Distributions and Sales | ||||
| Prospectus [Line Items] | ||||
| Average Annual Return, Percent | 15.61% | 0.24% | 5.18% |