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Acquisitions (Narrative) (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Nov. 30, 2014
Nov. 30, 2013
Nov. 30, 2012
May 31, 2013
May 31, 2014
Business Acquisition [Line Items]          
Cash paid for acquisition $ 0us-gaap_PaymentsToAcquireBusinessesGross $ 142.3us-gaap_PaymentsToAcquireBusinessesGross $ 0us-gaap_PaymentsToAcquireBusinessesGross    
Goodwill 1,722.2us-gaap_Goodwill 1,798.5us-gaap_Goodwill 1,695.3us-gaap_Goodwill    
Transaction costs   4.3us-gaap_BusinessAcquisitionCostOfAcquiredEntityTransactionCosts 1.7us-gaap_BusinessAcquisitionCostOfAcquiredEntityTransactionCosts    
Wuhan Asia-Pacific Condiments Co. Ltd (WAPC) [Member]          
Business Acquisition [Line Items]          
Consideration transferred   144.8us-gaap_BusinessCombinationConsiderationTransferred1
/ us-gaap_BusinessAcquisitionAxis
= mkc_WuhanAsiaPacificCondimentsCoLtdWapcMember
     
Cash paid for acquisition   142.3us-gaap_PaymentsToAcquireBusinessesGross
/ us-gaap_BusinessAcquisitionAxis
= mkc_WuhanAsiaPacificCondimentsCoLtdWapcMember
     
Value of liabilities assumed   2.5us-gaap_NoncashOrPartNoncashAcquisitionValueOfLiabilitiesAssumed1
/ us-gaap_BusinessAcquisitionAxis
= mkc_WuhanAsiaPacificCondimentsCoLtdWapcMember
     
Approximate annual net sales       122us-gaap_BusinessAcquisitionsProFormaRevenue
/ us-gaap_BusinessAcquisitionAxis
= mkc_WuhanAsiaPacificCondimentsCoLtdWapcMember
 
Tangible net assets         26.9mkc_BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedTangibleAssetsTotal
/ us-gaap_BusinessAcquisitionAxis
= mkc_WuhanAsiaPacificCondimentsCoLtdWapcMember
Other intangible assets         46.1us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill
/ us-gaap_BusinessAcquisitionAxis
= mkc_WuhanAsiaPacificCondimentsCoLtdWapcMember
Goodwill         $ 71.8us-gaap_Goodwill
/ us-gaap_BusinessAcquisitionAxis
= mkc_WuhanAsiaPacificCondimentsCoLtdWapcMember