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BUSINESS SEGMENTS AND RELATED INFORMATION (Narrative) (Detail) (USD $)
In Millions, unless otherwise specified
3 Months Ended 9 Months Ended
Feb. 22, 2015
Feb. 22, 2015
Segment
Feb. 23, 2014
May 25, 2014
Segment Reporting Information [Line Items]        
Number of reportable segments   3us-gaap_NumberOfReportableSegments    
Net derivative losses recognized in general corporate expenses   $ 101.3us-gaap_DerivativeGainLossOnDerivativeNet    
Cumulative net derivative losses from economic hedges recognized in corporate 42.2cag_CumulativeDerivativeGainsLossesRecognizedNotYetReclassifiedToSegmentOperatingResults 42.2cag_CumulativeDerivativeGainsLossesRecognizedNotYetReclassifiedToSegmentOperatingResults    
Derivative gain to be reclassified to segment operating results thereafter   59.1cag_DerivativeGainLossOfPreviousYearToBeReclassifiedToSegmentOperatingResults    
Reclassify losses in 2014   25.5cag_DerivativeGainsLossesToBeReclassifiedToSegmentOperatingResultsNextFiscalYear    
Reclassify losses in 2015 and thereafter   16.7cag_DerivativeGainLossToBeReclassifiedToSegmentOperatingResultsThereafter    
Percentage of consolidated net sales in consumer food segment accounted by Wal-Mart Stores, Inc. and its affiliates 18.00%us-gaap_ConcentrationRiskPercentage1 19.00%us-gaap_ConcentrationRiskPercentage1 18.00%us-gaap_ConcentrationRiskPercentage1  
Percentage of consolidated net receivables in commercial foods accounted by Wal-Mart Stores, Inc. and its affiliates 17.00%cag_EntityWideReceivablesMajorCustomerAmountInPercentage 17.00%cag_EntityWideReceivablesMajorCustomerAmountInPercentage   16.00%cag_EntityWideReceivablesMajorCustomerAmountInPercentage
Consumer Foods        
Segment Reporting Information [Line Items]        
Net derivative losses recognized in general corporate expenses 20.9us-gaap_DerivativeGainLossOnDerivativeNet
/ us-gaap_StatementBusinessSegmentsAxis
= cag_ConsumerFoodsMember
18.6us-gaap_DerivativeGainLossOnDerivativeNet
/ us-gaap_StatementBusinessSegmentsAxis
= cag_ConsumerFoodsMember
   
Private Brands        
Segment Reporting Information [Line Items]        
Net derivative losses recognized in general corporate expenses 5.7us-gaap_DerivativeGainLossOnDerivativeNet
/ us-gaap_StatementBusinessSegmentsAxis
= cag_PrivateBrandsMember
5.1us-gaap_DerivativeGainLossOnDerivativeNet
/ us-gaap_StatementBusinessSegmentsAxis
= cag_PrivateBrandsMember
   
Commercial Segment        
Segment Reporting Information [Line Items]        
Net derivative losses recognized in general corporate expenses $ (1.6)us-gaap_DerivativeGainLossOnDerivativeNet
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_CommercialPortfolioSegmentMember
$ 1.4us-gaap_DerivativeGainLossOnDerivativeNet
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_CommercialPortfolioSegmentMember