Alger Capital Appreciation Fund Annual Fund Operating Expenses - Class A C Shares [Member] - Alger Capital Appreciation Fund	Oct. 31, 2025
Class A
Prospectus [Line Items]
Management Fees (as a percentage of Assets)	0.80%	[1]
Distribution and Service (12b-1) Fees	0.25%
Other Expenses (as a percentage of Assets):	0.23%
Expenses (as a percentage of Assets)	1.28%
Class C
Prospectus [Line Items]
Management Fees (as a percentage of Assets)	0.80%	[1]
Distribution and Service (12b-1) Fees	1.00%
Other Expenses (as a percentage of Assets):	0.25%
Expenses (as a percentage of Assets)	2.05%

[1] The Fund and Fred Alger Management, LLC (the “Manager”) have adopted fee breakpoints for the Fund. The advisory fee for assets up to $2 billion is .81%, for assets between $2 billion and $3 billion is .65%, for assets between $3 billion and $4 billion is .60%, for assets between $4 billion and $5 billion is .55%, and for assets in excess of $5 billion is .45%. The actual rate paid as a percentage of average daily net assets for the year ended October 31, 2025 was .80%.