Alger Emerging Markets 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 |
|
| 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 A | ||||
| Prospectus [Line Items] | ||||
| Average Annual Return, Percent | 18.65% | (1.40%) | 5.63% | |
| Performance Inception Date | Dec. 29, 2010 | |||
| Class A | After Taxes on Distributions | ||||
| Prospectus [Line Items] | ||||
| Average Annual Return, Percent | 18.78% | (1.43%) | 5.16% | |
| Class A | After Taxes on Distributions and Sales | ||||
| Prospectus [Line Items] | ||||
| Average Annual Return, Percent | 11.19% | (0.98%) | 4.30% | |
| Class C | ||||
| Prospectus [Line Items] | ||||
| Average Annual Return, Percent | 23.24% | (1.07%) | 5.55% | |
| Performance Inception Date | Dec. 29, 2010 |