Alger Emerging Markets Fund Average Annual Total Returns - Class I 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 I | ||||
| Prospectus [Line Items] | ||||
| Average Annual Return, Percent | 25.30% | (0.23%) | 6.27% | |
| Performance Inception Date | Dec. 29, 2010 | |||
| Class I | After Taxes on Distributions | ||||
| Prospectus [Line Items] | ||||
| Average Annual Return, Percent | 25.43% | (0.27%) | 5.77% | |
| Class I | After Taxes on Distributions and Sales | ||||
| Prospectus [Line Items] | ||||
| Average Annual Return, Percent | 15.13% | (0.10%) | 4.82% |