Average Annual Total Returns - Class A C Shares - Alger Capital Appreciation Fund - AC	Class A Inception Date	Class A Return Before Taxes 1 Year	Class A Return Before Taxes 5 Years	Class A Return Before Taxes 10 Years	Class A Return After Taxes on Distributions 1 Year	Class A Return After Taxes on Distributions 5 Years	Class A Return After Taxes on Distributions 10 Years	Class A Return After Taxes on Distributions and Sale of Fund Shares 1 Year	Class A Return After Taxes on Distributions and Sale of Fund Shares 5 Years	Class A Return After Taxes on Distributions and Sale of Fund Shares 10 Years	Class C Inception Date	Class C Return Before Taxes 1 Year	Class C Return Before Taxes 5 Years	Class C Return Before Taxes 10 Years	Russell 1000 Growth Index (reflects no deductions for fees, expenses or taxes) 1 Year	Russell 1000 Growth Index (reflects no deductions for fees, expenses or taxes) 5 Years	Russell 1000 Growth Index (reflects no deductions for fees, expenses or taxes) 10 Years
Total	Dec. 31, 2096	34.20%	18.41%	15.99%	29.85%	16.21%	13.97%	23.30%	14.48%	12.79%	Jul. 31, 2097	39.55%	18.81%	15.73%	38.49%	21.00%	17.21%