Average Annual Total Returns - Class Z Shares - Alger Growth and Income Fund - AC	Class Z Inception Date	Class Z Return Before Taxes 1 Year	Class Z Return Before Taxes 5 Years	Class Z Return Before Taxes Since Inception	Class Z Return After Taxes on Distributions 1 Year	Class Z Return After Taxes on Distributions 5 Years	Class Z Return After Taxes on Distributions Since Inception	Class Z Return After Taxes on Distributions and Sale of Fund Shares 1 Year	Class Z Return After Taxes on Distributions and Sale of Fund Shares 5 Years	Class Z Return After Taxes on Distributions and Sale of Fund Shares Since Inception	S&P 500 Index (reflects no deductions for fees, expenses or taxes) 1 Year	S&P 500 Index (reflects no deductions for fees, expenses or taxes) 5 Years	S&P 500 Index (reflects no deductions for fees, expenses or taxes) Since Inception
Total	Mar. 01, 2012	15.65%	13.86%	13.04%	14.47%	12.42%	11.63%	9.46%	10.55%	10.14%	18.40%	15.22%	14.38%