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Label Element Value
Risk/Return: rr_RiskReturnAbstract  
Entity Central Index Key dei_EntityCentralIndexKey 0000787441
MainStay MacKay International Equity Fund (Prospectus Summary) | MainStay MacKay International Equity Fund  
Risk/Return: rr_RiskReturnAbstract  
Risk/Return, Heading rr_RiskReturnHeading MainStay MacKay International Equity Fund
Supplement ck0000787441_SupplementTextBlock

MAINSTAY FUNDS TRUST

 

MainStay MacKay International Equity Fund

(the “Fund”)

 

Supplement dated December 14, 2018 (“Supplement”) to the
Summary Prospectus and Prospectus dated February 28, 2018, as supplemented

 

Capitalized terms and certain other terms used in this Supplement, unless otherwise defined in this Supplement, have the meanings assigned to them in the Prospectus.

 

New York Life Investment Management LLC has contractually agreed to limit the expenses of the Fund as provided below. Accordingly, effective January 1, 2019, the following changes are made to the Summary Prospectus and Prospectus:

 

The table and footnotes in the section entitled “Fees and Expenses of the Fund” as well as the table in the section entitled “Example” of the Prospectus and Summary Prospectus are deleted in their entirety and replaced with the following:
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)
Expense Example by, Year, Caption [Text] rr_ExpenseExampleByYearCaption Assuming redemption at end of period
Expense Example [Heading] rr_ExpenseExampleNoRedemptionByYearCaption Assuming no redemption
Supplement Closing ck0000787441_SupplementClosingTextBlock

PLEASE RETAIN THIS SUPPLEMENT FOR YOUR FUTURE REFERENCE.
MainStay MacKay International Equity Fund (Prospectus Summary) | MainStay MacKay International Equity Fund | Class A  
Risk/Return: rr_RiskReturnAbstract  
Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice 5.50%
Maximum Deferred Sales Charge (Load) (as a percentage of the lesser of the original offering price or redemption proceeds) rr_MaximumDeferredSalesChargeOverOther none [1]
Management Fees (as an annual percentage of the Fund's average daily net assets) rr_ManagementFeesOverAssets 0.89% [2]
Distribution and/or Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Other Expenses rr_OtherExpensesOverAssets 0.18%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 1.32%
Waivers/Reimbursements rr_FeeWaiverOrReimbursementOverAssets (0.17%) [3]
Total Annual Fund Operating Expenses After Waivers/Reimbursements rr_NetExpensesOverAssets 1.15% [3]
1 Year rr_ExpenseExampleYear01 $ 661
3 Years rr_ExpenseExampleYear03 929
5 Years rr_ExpenseExampleYear05 1,218
10 Years rr_ExpenseExampleYear10 $ 2,039
MainStay MacKay International Equity Fund (Prospectus Summary) | MainStay MacKay International Equity Fund | INVESTOR CLASS  
Risk/Return: rr_RiskReturnAbstract  
Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice 5.50%
Maximum Deferred Sales Charge (Load) (as a percentage of the lesser of the original offering price or redemption proceeds) rr_MaximumDeferredSalesChargeOverOther none [1]
Management Fees (as an annual percentage of the Fund's average daily net assets) rr_ManagementFeesOverAssets 0.89% [2]
Distribution and/or Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Other Expenses rr_OtherExpensesOverAssets 0.52%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 1.66%
Waivers/Reimbursements rr_FeeWaiverOrReimbursementOverAssets (0.17%) [3]
Total Annual Fund Operating Expenses After Waivers/Reimbursements rr_NetExpensesOverAssets 1.49% [3]
1 Year rr_ExpenseExampleYear01 $ 693
3 Years rr_ExpenseExampleYear03 1,029
5 Years rr_ExpenseExampleYear05 1,387
10 Years rr_ExpenseExampleYear10 $ 2,394
MainStay MacKay International Equity Fund (Prospectus Summary) | MainStay MacKay International Equity Fund | Class B  
Risk/Return: rr_RiskReturnAbstract  
Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none [4]
Maximum Deferred Sales Charge (Load) (as a percentage of the lesser of the original offering price or redemption proceeds) rr_MaximumDeferredSalesChargeOverOther 5.00% [4]
Management Fees (as an annual percentage of the Fund's average daily net assets) rr_ManagementFeesOverAssets 0.89% [2]
Distribution and/or Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 1.00%
Other Expenses rr_OtherExpensesOverAssets 0.52%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 2.41%
Waivers/Reimbursements rr_FeeWaiverOrReimbursementOverAssets (0.17%) [3]
Total Annual Fund Operating Expenses After Waivers/Reimbursements rr_NetExpensesOverAssets 2.24% [3]
1 Year rr_ExpenseExampleYear01 $ 727
3 Years rr_ExpenseExampleYear03 1,035
5 Years rr_ExpenseExampleYear05 1,470
10 Years rr_ExpenseExampleYear10 2,547
1 Year rr_ExpenseExampleNoRedemptionYear01 227
3 Years rr_ExpenseExampleNoRedemptionYear03 735
5 Years rr_ExpenseExampleNoRedemptionYear05 1,270
10 Years rr_ExpenseExampleNoRedemptionYear10 $ 2,547
MainStay MacKay International Equity Fund (Prospectus Summary) | MainStay MacKay International Equity Fund | Class C  
Risk/Return: rr_RiskReturnAbstract  
Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (Load) (as a percentage of the lesser of the original offering price or redemption proceeds) rr_MaximumDeferredSalesChargeOverOther 1.00%
Management Fees (as an annual percentage of the Fund's average daily net assets) rr_ManagementFeesOverAssets 0.89% [2]
Distribution and/or Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 1.00%
Other Expenses rr_OtherExpensesOverAssets 0.52%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 2.41%
Waivers/Reimbursements rr_FeeWaiverOrReimbursementOverAssets (0.17%) [3]
Total Annual Fund Operating Expenses After Waivers/Reimbursements rr_NetExpensesOverAssets 2.24% [3]
1 Year rr_ExpenseExampleYear01 $ 327
3 Years rr_ExpenseExampleYear03 735
5 Years rr_ExpenseExampleYear05 1,270
10 Years rr_ExpenseExampleYear10 2,733
1 Year rr_ExpenseExampleNoRedemptionYear01 227
3 Years rr_ExpenseExampleNoRedemptionYear03 735
5 Years rr_ExpenseExampleNoRedemptionYear05 1,270
10 Years rr_ExpenseExampleNoRedemptionYear10 $ 2,733
MainStay MacKay International Equity Fund (Prospectus Summary) | MainStay MacKay International Equity Fund | Class I  
Risk/Return: rr_RiskReturnAbstract  
Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (Load) (as a percentage of the lesser of the original offering price or redemption proceeds) rr_MaximumDeferredSalesChargeOverOther none
Management Fees (as an annual percentage of the Fund's average daily net assets) rr_ManagementFeesOverAssets 0.89% [2]
Distribution and/or Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses rr_OtherExpensesOverAssets 0.18%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 1.07%
Waivers/Reimbursements rr_FeeWaiverOrReimbursementOverAssets (0.22%) [3]
Total Annual Fund Operating Expenses After Waivers/Reimbursements rr_NetExpensesOverAssets 0.85% [3]
1 Year rr_ExpenseExampleYear01 $ 87
3 Years rr_ExpenseExampleYear03 318
5 Years rr_ExpenseExampleYear05 569
10 Years rr_ExpenseExampleYear10 $ 1,286
MainStay MacKay International Equity Fund (Prospectus Summary) | MainStay MacKay International Equity Fund | Class R1  
Risk/Return: rr_RiskReturnAbstract  
Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (Load) (as a percentage of the lesser of the original offering price or redemption proceeds) rr_MaximumDeferredSalesChargeOverOther none
Management Fees (as an annual percentage of the Fund's average daily net assets) rr_ManagementFeesOverAssets 0.89% [2]
Distribution and/or Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses rr_OtherExpensesOverAssets 0.28%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 1.17%
Waivers/Reimbursements rr_FeeWaiverOrReimbursementOverAssets (0.17%) [3]
Total Annual Fund Operating Expenses After Waivers/Reimbursements rr_NetExpensesOverAssets 1.00% [3]
1 Year rr_ExpenseExampleYear01 $ 102
3 Years rr_ExpenseExampleYear03 355
5 Years rr_ExpenseExampleYear05 627
10 Years rr_ExpenseExampleYear10 $ 1,405
MainStay MacKay International Equity Fund (Prospectus Summary) | MainStay MacKay International Equity Fund | Class R2  
Risk/Return: rr_RiskReturnAbstract  
Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (Load) (as a percentage of the lesser of the original offering price or redemption proceeds) rr_MaximumDeferredSalesChargeOverOther none
Management Fees (as an annual percentage of the Fund's average daily net assets) rr_ManagementFeesOverAssets 0.89% [2]
Distribution and/or Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Other Expenses rr_OtherExpensesOverAssets 0.28%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 1.42%
Waivers/Reimbursements rr_FeeWaiverOrReimbursementOverAssets (0.17%) [3]
Total Annual Fund Operating Expenses After Waivers/Reimbursements rr_NetExpensesOverAssets 1.25% [3]
1 Year rr_ExpenseExampleYear01 $ 127
3 Years rr_ExpenseExampleYear03 433
5 Years rr_ExpenseExampleYear05 760
10 Years rr_ExpenseExampleYear10 $ 1,687
MainStay MacKay International Equity Fund (Prospectus Summary) | MainStay MacKay International Equity Fund | Class R3  
Risk/Return: rr_RiskReturnAbstract  
Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (Load) (as a percentage of the lesser of the original offering price or redemption proceeds) rr_MaximumDeferredSalesChargeOverOther none
Management Fees (as an annual percentage of the Fund's average daily net assets) rr_ManagementFeesOverAssets 0.89% [2]
Distribution and/or Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.50%
Other Expenses rr_OtherExpensesOverAssets 0.28%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 1.67%
Waivers/Reimbursements rr_FeeWaiverOrReimbursementOverAssets (0.17%) [3]
Total Annual Fund Operating Expenses After Waivers/Reimbursements rr_NetExpensesOverAssets 1.50% [3]
1 Year rr_ExpenseExampleYear01 $ 153
3 Years rr_ExpenseExampleYear03 510
5 Years rr_ExpenseExampleYear05 891
10 Years rr_ExpenseExampleYear10 $ 1,962
[1] A contingent deferred sales charge of 1.00% may be imposed on certain redemptions made within 18 months of the date of purchase on shares that were purchased without an initial sales charge.
[2] The management fee is as follows: 0.89% on assets up to $500 million and 0.85% on assets over $500 million
[3] New York Life Investment Management LLC ("New York Life Investments") has contractually agreed to waive fees and/or reimburse expenses so that Total Annual Fund Operating Expenses (excluding taxes, interest, litigation, extraordinary expenses, brokerage and other transaction expenses relating to the purchase or sale of portfolio investments, and acquired (underlying) fund fees and expenses) for a class do not exceed the following percentage of its average daily net assets: Class I, 0.85% and Class R6, 0.83%. New York Life Investments will apply an equivalent waiver or reimbursement, in an equal number of basis points of the Class R6 shares waiver/reimbursement to the Class A, Investor Class, Class B, Class C, Class R1, Class R2 and Class R3 shares. This agreement will remain in effect until February 28, 2020 and shall renew automatically for one-year terms unless New York Life Investments provides written notice of termination prior to the start of the next term or upon approval of the Board of Trustees of the Fund.
[4] Class B shares are closed to all new purchases as well as additional investments by existing Class B shareholders.