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Label Element Value
Risk/Return: rr_RiskReturnAbstract  
Registrant Name dei_EntityRegistrantName ALGER FUNDS II
Prospectus Date rr_ProspectusDate Mar. 01, 2019
Supplement to Prospectus [Text Block] rr_SupplementToProspectusTextBlock

THE ALGER FUNDS II

Alger Dynamic Opportunities Fund

March 15, 2019 to the Statutory

Prospectus dated March 1, 2019, as supplemented to date

The section “Fund Fees and Expenses” in the prospectus for Alger Dynamic Opportunities Fund Class A and C Shares is hereby deleted in its entirety and replaced with the following:

Fund Fees and Expenses

This table describes the fees and expenses that you may pay if you buy and hold shares of the Fund. You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $25,000 in Class A Shares of the Alger Family of Funds, including the Fund. More information about these and other discounts is available from your financial professional and in “Purchasing and Redeeming Fund Shares” on page 35 and in Appendix A – Waivers and Discounts Available from Intermediaries on page A-1 in the Fund’s Prospectus, and in the sections “Right of Accumulation (Class A Shares)” and “Letter of Intent (Class A Shares)” on page 28 of the Fund’s Statement of Additional Information.

 

     Alger Dynamic
Opportunities Fund
Class
    A    C
Shareholder Fees
(fees paid directly from your investment)
      
Maximum sales charge (load) imposed on purchases as a % of offering price
    5.25%    None
Maximum deferred sales charge (load) as a % of purchase price or
redemption proceeds, whichever is lower
    None*    1.00%
Annual Fund Operating Expenses
(expenses that you pay each year as a percentage of the value of your investment)
      
Advisory Fees
    1.20%    1.20%
Distribution and/or Service (12b-1) Fees
    .25%    1.00%
Other Expenses**
    1.18%**    1.21%**
Total Annual Fund Operating Expenses
    2.63%    3.41%
Fee Waiver and/or Expense Reimbursement***
    (.63)%***    (.66)%***
Total Annual Fund Operating Expenses After Fee Waiver and/or
Expense Reimbursement
    2.00%    2.75%

 

*
Purchases of $1 million or more of Class A Shares at net asset value may be subject to a contingent deferred sales charge of 1.00% on redemptions made within 12 months of purchase.
**
Other Expenses includes dividend and interest expense on short sales of .81% for Class A Shares and Class C Shares.
***
Fred Alger Management, Inc. has contractually agreed to waive fees or to reimburse Fund expenses (excluding acquired fund fees and expenses, interest, taxes, brokerage and extraordinary expenses) through February 28, 2021 to the extent necessary to limit the total annual fund operating expenses of the Fund’s Class A Shares to 2.00%, and the Class C Shares to 2.75%, of the class’s average daily net assets. This expense reimbursement may only be amended or terminated prior to its expiration date by agreement between Fred Alger Management, Inc. and the Fund’s Board of Trustees, and will terminate automatically in the event of termination of the Investment Advisory Agreement. Fred Alger Management, Inc. may, during the first year of the expense reimbursement contract, recoup any expenses waived or reimbursed pursuant to the expense reimbursement contract to the extent that such recoupment would not cause the expense ratio to exceed the lesser of the stated limitation in effect at the time of (i) the waiver or reimbursement and (ii) the recoupment after the repayment of the recoupment is taken into account.

Example

The following examples are intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The examples assume 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. The one-year example and the first two years of the three-, five- and ten-years examples are based on net operating expenses, which reflect the contractual expense limitation agreed to by Fred Alger Management, Inc. Although your actual costs may be higher or lower, based on these assumptions you would pay the following expenses if you redeemed your shares at the end of each period:

 

     1 Year      3 Years      5 Years      10 Years  
Class A
    $ 717      $ 1,183      $ 1,737      $ 3,242  
Class C
    $ 378      $ 922      $ 1,658      $ 3,602  
You would pay the following expenses if you did not redeem your shares:
 
Class C
    $ 278      $ 922      $ 1,658      $ 3,602  
Alger Dynamic Opportunities Fund  
Risk/Return: rr_RiskReturnAbstract  
Supplement to Prospectus [Text Block] rr_SupplementToProspectusTextBlock

THE ALGER FUNDS II

Alger Dynamic Opportunities Fund

March 15, 2019 to the Statutory

Prospectus dated March 1, 2019, as supplemented to date

The section “Fund Fees and Expenses” in the prospectus for Alger Dynamic Opportunities Fund Class A and C Shares is hereby deleted in its entirety and replaced with the following:

Fund Fees and Expenses

This table describes the fees and expenses that you may pay if you buy and hold shares of the Fund. You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $25,000 in Class A Shares of the Alger Family of Funds, including the Fund. More information about these and other discounts is available from your financial professional and in “Purchasing and Redeeming Fund Shares” on page 35 and in Appendix A – Waivers and Discounts Available from Intermediaries on page A-1 in the Fund’s Prospectus, and in the sections “Right of Accumulation (Class A Shares)” and “Letter of Intent (Class A Shares)” on page 28 of the Fund’s Statement of Additional Information.

 

     Alger Dynamic
Opportunities Fund
Class
    A    C
Shareholder Fees
(fees paid directly from your investment)
      
Maximum sales charge (load) imposed on purchases as a % of offering price
    5.25%    None
Maximum deferred sales charge (load) as a % of purchase price or
redemption proceeds, whichever is lower
    None*    1.00%
Annual Fund Operating Expenses
(expenses that you pay each year as a percentage of the value of your investment)
      
Advisory Fees
    1.20%    1.20%
Distribution and/or Service (12b-1) Fees
    .25%    1.00%
Other Expenses**
    1.18%**    1.21%**
Total Annual Fund Operating Expenses
    2.63%    3.41%
Fee Waiver and/or Expense Reimbursement***
    (.63)%***    (.66)%***
Total Annual Fund Operating Expenses After Fee Waiver and/or
Expense Reimbursement
    2.00%    2.75%

 

*
Purchases of $1 million or more of Class A Shares at net asset value may be subject to a contingent deferred sales charge of 1.00% on redemptions made within 12 months of purchase.
**
Other Expenses includes dividend and interest expense on short sales of .81% for Class A Shares and Class C Shares.
***
Fred Alger Management, Inc. has contractually agreed to waive fees or to reimburse Fund expenses (excluding acquired fund fees and expenses, interest, taxes, brokerage and extraordinary expenses) through February 28, 2021 to the extent necessary to limit the total annual fund operating expenses of the Fund’s Class A Shares to 2.00%, and the Class C Shares to 2.75%, of the class’s average daily net assets. This expense reimbursement may only be amended or terminated prior to its expiration date by agreement between Fred Alger Management, Inc. and the Fund’s Board of Trustees, and will terminate automatically in the event of termination of the Investment Advisory Agreement. Fred Alger Management, Inc. may, during the first year of the expense reimbursement contract, recoup any expenses waived or reimbursed pursuant to the expense reimbursement contract to the extent that such recoupment would not cause the expense ratio to exceed the lesser of the stated limitation in effect at the time of (i) the waiver or reimbursement and (ii) the recoupment after the repayment of the recoupment is taken into account.

Example

The following examples are intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The examples assume 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. The one-year example and the first two years of the three-, five- and ten-years examples are based on net operating expenses, which reflect the contractual expense limitation agreed to by Fred Alger Management, Inc. Although your actual costs may be higher or lower, based on these assumptions you would pay the following expenses if you redeemed your shares at the end of each period:

 

     1 Year      3 Years      5 Years      10 Years  
Class A
    $ 717      $ 1,183      $ 1,737      $ 3,242  
Class C
    $ 378      $ 922      $ 1,658      $ 3,602  
You would pay the following expenses if you did not redeem your shares:
 
Class C
    $ 278      $ 922      $ 1,658      $ 3,602  
Expense [Heading] rr_ExpenseHeading <b>Fund Fees and Expenses</b>
Expense Narrative [Text Block] rr_ExpenseNarrativeTextBlock This table describes the fees and expenses that you may pay if you buy and hold shares of the Fund. You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $25,000 in Class A Shares of the Alger Family of Funds, including the Fund. More information about these and other discounts is available from your financial professional and in “Purchasing and Redeeming Fund Shares” on page 35 and in Appendix A – Waivers and Discounts Available from Intermediaries on page A-1 in the Fund’s Prospectus, and in the sections “Right of Accumulation (Class A Shares)” and “Letter of Intent (Class A Shares)” on page 28 of the Fund’s Statement of Additional Information.
Shareholder Fees Caption [Text] rr_ShareholderFeesCaption <b>Shareholder Fees</b><br/> (fees paid directly from your investment)
Operating Expenses Caption [Text] rr_OperatingExpensesCaption <b>Annual Fund Operating Expenses</b><br/> (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 February 28, 2021
Expenses Deferred Charges [Text Block] rr_ExpensesDeferredChargesTextBlock Purchases of $1 million or more of Class A Shares at net asset value may be subject to a contingent deferred sales charge of 1.00% on redemptions made within 12 months of purchase.
Expense Breakpoint Discounts [Text] rr_ExpenseBreakpointDiscounts You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $25,000 in Class A Shares of the Alger Family of Funds, including the Fund.
Expense Breakpoint, Minimum Investment Required [Amount] rr_ExpenseBreakpointMinimumInvestmentRequiredAmount $ 25,000
Expense Example [Heading] rr_ExpenseExampleHeading <b>Example </b>
Expense Example Narrative [Text Block] rr_ExpenseExampleNarrativeTextBlock The following examples are intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The examples assume 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. The one-year example and the first two years of the three-, five- and ten-years examples are based on net operating expenses, which reflect the contractual expense limitation agreed to by Fred Alger Management, Inc. Although your actual costs may be higher or lower, based on these assumptions you would pay the following expenses if you redeemed your shares at the end of each period:
Expense Example, No Redemption, By Year, Caption [Text] rr_ExpenseExampleNoRedemptionByYearCaption <b>You would pay the following expenses if you did not redeem your shares:</b>
Alger Dynamic Opportunities Fund | Class A  
Risk/Return: rr_RiskReturnAbstract  
Maximum sales charge (load) imposed on purchases as a % of offering price rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice 5.25%
Maximum deferred sales charge (load) as a % of purchase price or redemption proceeds, whichever is lower rr_MaximumDeferredSalesChargeOverOther none [1]
Advisory Fees rr_ManagementFeesOverAssets 1.20%
Distribution and/or Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Other Expenses rr_OtherExpensesOverAssets 1.18% [2]
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 2.63%
Fee Waiver and/or Expense Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.63%) [3]
Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement rr_NetExpensesOverAssets 2.00%
1 Year rr_ExpenseExampleYear01 $ 717
3 Years rr_ExpenseExampleYear03 1,183
5 Years rr_ExpenseExampleYear05 1,737
10 Years rr_ExpenseExampleYear10 $ 3,242
Alger Dynamic Opportunities Fund | Class C  
Risk/Return: rr_RiskReturnAbstract  
Maximum sales charge (load) imposed on purchases as a % of offering price rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum deferred sales charge (load) as a % of purchase price or redemption proceeds, whichever is lower rr_MaximumDeferredSalesChargeOverOther 1.00%
Advisory Fees rr_ManagementFeesOverAssets 1.20%
Distribution and/or Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 1.00%
Other Expenses rr_OtherExpensesOverAssets 1.21% [2]
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 3.41%
Fee Waiver and/or Expense Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.66%) [3]
Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement rr_NetExpensesOverAssets 2.75%
1 Year rr_ExpenseExampleYear01 $ 378
3 Years rr_ExpenseExampleYear03 922
5 Years rr_ExpenseExampleYear05 1,658
10 Years rr_ExpenseExampleYear10 3,602
1 Year rr_ExpenseExampleNoRedemptionYear01 278
3 Years rr_ExpenseExampleNoRedemptionYear03 922
5 Years rr_ExpenseExampleNoRedemptionYear05 1,658
10 Years rr_ExpenseExampleNoRedemptionYear10 $ 3,602
[1] Purchases of $1 million or more of Class A Shares at net asset value may be subject to a contingent deferred sales charge of 1.00% on redemptions made within 12 months of purchase.
[2] Other Expenses includes dividend and interest expense on short sales of .81% for Class A Shares and Class C Shares.
[3] Fred Alger Management, Inc. has contractually agreed to waive fees or to reimburse Fund expenses (excluding acquired fund fees and expenses, interest, taxes, brokerage and extraordinary expenses) through February 28, 2021 to the extent necessary to limit the total annual fund operating expenses of the Fund’s Class A Shares to 2.00%, and the Class C Shares to 2.75%, of the class’s average daily net assets. This expense reimbursement may only be amended or terminated prior to its expiration date by agreement between Fred Alger Management, Inc. and the Fund’s Board of Trustees, and will terminate automatically in the event of termination of the Investment Advisory Agreement. Fred Alger Management, Inc. may, during the first year of the expense reimbursement contract, recoup any expenses waived or reimbursed pursuant to the expense reimbursement contract to the extent that such recoupment would not cause the expense ratio to exceed the lesser of the stated limitation in effect at the time of (i) the waiver or reimbursement and (ii) the recoupment after the repayment of the recoupment is taken into account.