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ACQUISITIONS (Narrative) (Details) (USD $)
In Millions, unless otherwise specified
6 Months Ended 1 Months Ended
Nov. 23, 2014
Nov. 24, 2013
Jul. 31, 2014
Sep. 30, 2013
May 25, 2014
Business Acquisitions [Line Items]          
Payments to acquire business, net $ 75.4us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired $ 39.6us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired      
Purchase price allocated to goodwill 7,616.8us-gaap_Goodwill       7,828.5us-gaap_Goodwill
TaiMei Potato Industry Limited          
Business Acquisitions [Line Items]          
Payments to acquire business, gross     92.5us-gaap_PaymentsToAcquireBusinessesGross
/ us-gaap_BusinessAcquisitionAxis
= cag_TaiMeiPotatoIndustryLimitedMember
   
Payments to acquire business, net     75.4us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired
/ us-gaap_BusinessAcquisitionAxis
= cag_TaiMeiPotatoIndustryLimitedMember
   
Purchase price allocated to goodwill     21.6us-gaap_Goodwill
/ us-gaap_BusinessAcquisitionAxis
= cag_TaiMeiPotatoIndustryLimitedMember
   
Purchase price allocated to other intangible assets     1.3us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill
/ us-gaap_BusinessAcquisitionAxis
= cag_TaiMeiPotatoIndustryLimitedMember
   
Harlan Bakeries          
Business Acquisitions [Line Items]          
Payments to acquire business, gross       $ 39.9us-gaap_PaymentsToAcquireBusinessesGross
/ us-gaap_BusinessAcquisitionAxis
= cag_HarlanBakeriesMember