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Label Element Value
[RiskReturnAbstract] rr_RiskReturnAbstract  
Document Type dei_DocumentType Other
Document Period End Date dei_DocumentPeriodEndDate Jan. 31, 2014
Registrant Name dei_EntityRegistrantName Eaton Vance Mutual Funds Trust
Central Index Key dei_EntityCentralIndexKey 0000745463
Amendment Flag dei_AmendmentFlag false
Document Creation Date dei_DocumentCreationDate Jul. 10, 2014
Document Effective Date dei_DocumentEffectiveDate Jul. 10, 2014
Prospectus Date rr_ProspectusDate Jul. 01, 2014
Parametric International Equity Fund
  
[RiskReturnAbstract] rr_RiskReturnAbstract  
Supplement [Text Block] evmft_SupplementTextBlock

PARAMETRIC EMERGING MARKETS FUND

PARAMETRIC GLOBAL SMALL-CAP FUND

PARAMETRIC INTERNATIONAL EQUITY FUND
Supplement to Prospectus dated June 1, 2014, as revised July 1, 2014

 

The following replaces “Fees and Expenses of the Fund” under “Fund Summaries – Parametric International Equity Fund”:

Fees and Expenses of the Fund

This table describes the fees and expenses that you may pay if you buy and hold shares of the Fund.

     
Shareholder Fees (fees paid directly from your investment) Investor Class Institutional Class
Maximum Sales Charge (Load) (as a percentage of offering price) None None
Maximum Deferred Sales Charge (Load) (as a percentage of the lower of net asset value at purchase or redemption) None None

 

     
Annual Fund Operating Expenses (expenses you pay each year as a percentage of the value of your investment) Investor Class Institutional Class
Management Fees 0.75% 0.75%
Distribution and Service (12b-1) Fees 0.25% n/a
Other Expenses 0.34% 0.34%
Total Annual Fund Operating Expenses 1.34% 1.09%
Expense Reimbursement(1) (0.44)% (0.44)%
Total Annual Fund Operating Expenses After Expense Reimbursement 0.90% 0.65%

(1)

The investment adviser and administrator and sub-adviser have agreed to reimburse the Fund’s expenses to the extent that Total Annual Fund Operating Expenses exceed 0.90% for Investor Class shares and 0.65% for Institutional Class shares. This expense reimbursement will continue through May 31, 2015. Any amendment to or a termination of this reimbursement would require written approval of the Board of Trustees. The expense reimbursement relates to ordinary operating expenses only and does not include expenses such as: brokerage commissions, acquired fund fees and expenses of unaffiliated funds, interest expense, taxes or litigation expenses. Amounts reimbursed may be recouped by the investment adviser and administrator and sub-adviser during the Fund’s current fiscal year to the extent actual expenses are less than the contractual expense cap during such year.

Example. This 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 and then redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return each year and that the operating expenses remain the same. Although your actual costs may be higher or lower, based on these assumptions your costs would be:

         
  1 Year 3 Years 5 Years 10 Years
Investor Class shares $92 $381 $692 $1,574
Institutional Class shares $66 $303 $558 $1,289

 

   
July 10, 2014 15351 7.10.14
Parametric International Equity Fund | Investor Class
  
[RiskReturnAbstract] rr_RiskReturnAbstract  
Trading Symbol dei_TradingSymbol EAISX
Maximum Sales Charge (Load) (as a percentage of offering price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (Load) (as a percentage of the lower of net asset value at purchase or redemption) rr_MaximumDeferredSalesChargeOverOther none
Management Fees rr_ManagementFeesOverAssets 0.75%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Other Expenses rr_OtherExpensesOverAssets 0.34%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 1.34%
Expense Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.44%)
Total Annual Fund Operating Expenses After Expense Reimbursement rr_NetExpensesOverAssets 0.90%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 92
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 381
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 692
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 1,574
Parametric International Equity Fund | Institutional Class
  
[RiskReturnAbstract] rr_RiskReturnAbstract  
Trading Symbol dei_TradingSymbol EIISX
Maximum Sales Charge (Load) (as a percentage of offering price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (Load) (as a percentage of the lower of net asset value at purchase or redemption) rr_MaximumDeferredSalesChargeOverOther none
Management Fees rr_ManagementFeesOverAssets 0.75%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses rr_OtherExpensesOverAssets 0.34%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 1.09%
Expense Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.44%)
Total Annual Fund Operating Expenses After Expense Reimbursement rr_NetExpensesOverAssets 0.65%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 66
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 303
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 558
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,289