Alger Growth and Income Fund Average Annual Total Returns - Class A C Shares [Member] |
12 Months Ended | 21 Months Ended | 53 Months Ended | 60 Months Ended | 120 Months Ended | |
|---|---|---|---|---|---|---|
Oct. 31, 2025 |
Dec. 31, 2025 |
Dec. 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% | 19.32% | 12.04% | 14.42% | 14.82% | |
| Class A | ||||||
| Prospectus [Line Items] | ||||||
| Average Annual Return, Percent | 13.84% | 13.88% | 13.68% | |||
| Performance Inception Date | Dec. 31, 1996 | |||||
| Class A | After Taxes on Distributions | ||||||
| Prospectus [Line Items] | ||||||
| Average Annual Return, Percent | 13.58% | 13.25% | 12.72% | |||
| Class A | After Taxes on Distributions and Sales | ||||||
| Prospectus [Line Items] | ||||||
| Average Annual Return, Percent | 8.36% | 10.88% | 10.98% | |||
| Class C | ||||||
| Prospectus [Line Items] | ||||||
| Average Annual Return, Percent | 18.25% | 14.25% | 13.61% | |||
| Performance Inception Date | Jul. 31, 1997 |