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Label Element Value
[RiskReturnAbstract] rr_RiskReturnAbstract  
Document Type dei_DocumentType Other
Document Period End Date dei_DocumentPeriodEndDate Oct. 31, 2013
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. 07, 2014
Document Effective Date dei_DocumentEffectiveDate Jul. 07, 2014
Prospectus Date rr_ProspectusDate Mar. 01, 2014
Parametric Market Neutral Fund
  
[RiskReturnAbstract] rr_RiskReturnAbstract  
Supplement [Text Block] evmft_SupplementTextBlock

Parametric Market Neutral Fund
Supplement to
Prospectus dated March 1, 2014 and
Summary Prospectus dated March 1, 2014

On July 11, 2014, Parametric Market Neutral Fund will discontinue all sales of its shares, except shares purchased by: (1) existing shareholders (including shares acquired through the reinvestment of dividends and distributions); (2) employer sponsored retirement plans; or (3) fee-based programs (a) sponsored by financial intermediaries for which investment decisions are made on a centralized basis at the discretion of the firm (e.g., model portfolios managed by a firm or its investment committee); and (b) that have selected the Fund prior to the close of business on July 11, 2014.

   
   
July 7, 2014 15347 7.7.14

 
Parametric Market Neutral Fund | Investor Class
  
[RiskReturnAbstract] rr_RiskReturnAbstract  
Trading Symbol dei_TradingSymbol EPRAX
Parametric Market Neutral Fund | Institutional Class
  
[RiskReturnAbstract] rr_RiskReturnAbstract  
Trading Symbol dei_TradingSymbol EPRIX