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Alger Health Sciences Fund  
Risk/Return: rr_RiskReturnAbstract  
Supplement [Text Block] ck0000003521_SupplementTextBlock

THE ALGER FUNDS


Alger Health Sciences Fund


Supplement dated December 3, 2015 to the


Institutional Prospectus dated March 1, 2015,


As Revised August 7, 2015


As Supplemented to Date
Risk/Return [Heading] rr_RiskReturnHeading Alger Health Sciences Fund
Expense Narrative [Text Block] rr_ExpenseNarrativeTextBlock

The following replaces the table under the heading “Fund Fees and Expenses” on page 97 of the Institutional Prospectus:
Shareholder Fees Caption [Text] rr_ShareholderFeesCaption Shareholder Fees (fees paid directly from your investment)
Operating Expenses Caption [Text] rr_OperatingExpensesCaption Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination Jun. 22, 2016
Expense Example Narrative [Text Block] rr_ExpenseExampleNarrativeTextBlock

The following replaces the table under the heading “Example” on page 97 of the Institutional Prospectus:


Example


The following example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The example assumes that you invest $10,000 in the Fund for the time periods indicated, that your investment has a 5% return each year and that the Fund’s operating expenses remain the same.
Expense Example by, Year, Caption [Text] rr_ExpenseExampleByYearCaption Although your actual costs may be higher or lower, based on these assumptions you would pay the following expenses whether or not you redeemed your shares at the end of each period:
Alger Health Sciences Fund | Alger Health Sciences Fund Class Z  
Risk/Return: rr_RiskReturnAbstract  
Shareholder Fees (fees paid directly from your investment) rr_ShareholderFeeOther none
Management Fees rr_ManagementFeesOverAssets 0.81%
Distribution and/or Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses rr_OtherExpensesOverAssets 0.55%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 1.36%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.37%) [1]
Total Annual Fund Operating Expenses After Expense Reimbursement rr_NetExpensesOverAssets 0.99%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 101
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 394
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 709
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,603
[1] Fred Alger Management, Inc. has contractually agreed to reimburse Fund expenses (excluding interest, taxes, brokerage and extraordinary expenses) through June 22, 2016, to the extent necessary to limit the annual operating expenses of the Fund's Class Z Shares to .99% of the class's average net assets. This expense reimbursement cannot be terminated. Fred Alger Management, Inc. may recoup reimbursed expenses during the one-year term of the expense reimbursement contract if the expense ratio falls below the stated limitation.