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Acquisitions and Divestiture (Details) (USD $)
In Millions, unless otherwise specified
6 Months Ended 3 Months Ended 0 Months Ended
Nov. 23, 2014
May 25, 2014
Oct. 21, 2014
Acquisitions [Line Items]      
Goodwill, Acquired During Period $ 589.8us-gaap_GoodwillAcquiredDuringPeriod    
Indefinite Lived Intangible Assets Acquired 268.4us-gaap_IndefinitelivedIntangibleAssetsAcquired    
U.S. Retail [Member]      
Acquisitions [Line Items]      
Goodwill, Acquired During Period 589.8us-gaap_GoodwillAcquiredDuringPeriod
/ us-gaap_StatementBusinessSegmentsAxis
= country_US
   
Indefinite Lived Intangible Assets Acquired 268.4us-gaap_IndefinitelivedIntangibleAssetsAcquired
/ us-gaap_StatementBusinessSegmentsAxis
= country_US
   
Sale of Grain Elevators [Member] | U.S. Retail [Member]      
Divestiture [Line Items]      
Cash received on sale   124.0us-gaap_ProceedsFromDivestitureOfBusinesses
/ us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis
= gis_SaleOfGrainElevatorsMember
/ us-gaap_StatementBusinessSegmentsAxis
= country_US
 
Pre-tax gain on sale   65.5us-gaap_GainLossOnSaleOfOtherAssets
/ us-gaap_SignificantAcquisitionsAndDisposalsByTransactionAxis
= gis_SaleOfGrainElevatorsMember
/ us-gaap_StatementBusinessSegmentsAxis
= country_US
 
Business Acquisition, Annie's Inc [Member]      
Acquisitions [Line Items]      
Aggregate purchase price     821.2us-gaap_PaymentsToAcquireBusinessesGross
/ us-gaap_BusinessAcquisitionAxis
= gis_BusinessAcquisitionAnniesIncMember
Goodwill, Acquired During Period     589.8us-gaap_GoodwillAcquiredDuringPeriod
/ us-gaap_BusinessAcquisitionAxis
= gis_BusinessAcquisitionAnniesIncMember
Business Acquisition, Annie's Inc [Member] | Brands [Member]      
Acquisitions [Line Items]      
Indefinite Lived Intangible Assets Acquired     244.5us-gaap_IndefinitelivedIntangibleAssetsAcquired
/ us-gaap_BusinessAcquisitionAxis
= gis_BusinessAcquisitionAnniesIncMember
/ us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_TradeNamesMember
Business Acquisition, Annie's Inc [Member] | Customer Relationships [Member]      
Acquisitions [Line Items]      
Finite Lived Intangible Assets Acquired     $ 23.9us-gaap_FinitelivedIntangibleAssetsAcquired1
/ us-gaap_BusinessAcquisitionAxis
= gis_BusinessAcquisitionAnniesIncMember
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerRelationshipsMember