Alger Responsible Investing 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 |
|
| Russell 1000 Growth Index (reflects no deductions for fees, expenses or taxes)[Member] | ||||
| Prospectus [Line Items] | ||||
| Average Annual Return, Percent | 18.56% | 15.32% | 18.13% | |
| 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% | |
| Class A | ||||
| Prospectus [Line Items] | ||||
| Average Annual Return, Percent | 15.89% | 11.33% | 14.80% | |
| Performance Inception Date | Dec. 04, 2000 | |||
| Class A | After Taxes on Distributions | ||||
| Prospectus [Line Items] | ||||
| Average Annual Return, Percent | 13.66% | 10.07% | 13.11% | |
| Class A | After Taxes on Distributions and Sales | ||||
| Prospectus [Line Items] | ||||
| Average Annual Return, Percent | 10.92% | 8.81% | 11.85% | |
| Class C | ||||
| Prospectus [Line Items] | ||||
| Average Annual Return, Percent | 20.21% | 11.64% | 14.70% | |
| Performance Inception Date | Sep. 24, 2008 |