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Alger Small Cap Growth Institutional Fund Annual Fund Operating Expenses - Class I R Shares [Member] - Alger Small Cap Growth Institutional Fund
Oct. 31, 2025
Class I  
Prospectus [Line Items]  
Management Fees (as a percentage of Assets) 0.81% [1]
Distribution and Service (12b-1) Fees 0.00%
Component1 Other Expenses 0.33%
Component2 Other Expenses 0.25%
Other Expenses (as a percentage of Assets): 0.58%
Expenses (as a percentage of Assets) 1.39%
Class R  
Prospectus [Line Items]  
Management Fees (as a percentage of Assets) 0.81% [1]
Distribution and Service (12b-1) Fees 0.50%
Component1 Other Expenses 0.30%
Component2 Other Expenses 0.25%
Other Expenses (as a percentage of Assets): 0.55%
Expenses (as a percentage of Assets) 1.86%
[1] The Fund and Fred Alger Management, LLC (the “Manager”) have adopted fee breakpoints for the Fund. The advisory fee for assets up to $1 billion is .81%, and for assets in excess of $1 billion is .75%. The actual rate paid as a percentage of average daily net assets for the year ended October 31, 2025 was .81%.