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CONTINGENCIES (Details) (USD $)
 3 Months Ended 9 Months Ended 12 Months Ended 1 Months Ended 3 Months Ended 12 Months Ended
Nov. 23, 2014
Aug. 24, 2014
May 25, 2014
May 26, 2013
Aug. 26, 2012
Feb. 22, 2015
Feb. 23, 2014
May 30, 2009
May 26, 2013
May 27, 2012
Apr. 30, 2010
employee
Nov. 24, 2013
Feb. 24, 2013
May 31, 2015
Jan. 27, 2014
Guarantor Obligations [Line Items]                              
Loan purchase under agreement       $ 40,800,000cag_LoanPurchaseUnderAgreement         $ 40,800,000cag_LoanPurchaseUnderAgreement            
Asset impairment charges           1,555,700,000us-gaap_AssetImpairmentCharges 34,500,000us-gaap_AssetImpairmentCharges                
Face value of federal income tax credits           26,700,000us-gaap_TaxCreditCarryforwardAmount                  
Dispute coverage charge with insurance carrier               24,800,000us-gaap_LossContingencyLossInPeriod              
Loss Contingency Accrual, Period Increase (Decrease) 1,200,000us-gaap_LossContingencyAccrualCarryingValuePeriodIncreaseDecrease 5,800,000us-gaap_LossContingencyAccrualCarryingValuePeriodIncreaseDecrease 6,700,000us-gaap_LossContingencyAccrualCarryingValuePeriodIncreaseDecrease                        
Proceeds from Legal Settlements     3,500,000us-gaap_ProceedsFromLegalSettlements 25,000,000us-gaap_ProceedsFromLegalSettlements                      
Gain (Loss) Related to Litigation Settlement       25,000,000us-gaap_GainLossRelatedToLitigationSettlement                      
Punitive award against the company         7,000,000us-gaap_LossContingencyDamagesAwardedValue                    
Minimum annual payments to third party           2,500,000cag_Minimumannualpaymentstothirdparty                  
Litigation Matter                              
Guarantor Obligations [Line Items]                              
Dispute coverage charge with insurance carrier                 7,500,000us-gaap_LossContingencyLossInPeriod
/ cag_ContingenciesLitigationAxis
= cag_LitigationMatterMember		 17,500,000us-gaap_LossContingencyLossInPeriod
/ cag_ContingenciesLitigationAxis
= cag_LitigationMatterMember		          
Compensatory Damages                              
Guarantor Obligations [Line Items]                              
Unfavorable verdict         77,500,000cag_UnfavorableVerdict
/ cag_CommitmentsAndContingenciesAxis
= cag_CompensatoryDamagesMember		                    
Punitive Damages                              
Guarantor Obligations [Line Items]                              
Unfavorable verdict         100,000,000cag_UnfavorableVerdict
/ cag_CommitmentsAndContingenciesAxis
= cag_PunitiveDamagesMember		                    
Beatrice                              
Guarantor Obligations [Line Items]                              
Number of sites under environmental matters for which acquired company has a liability           37cag_EnvironmentalLossContingenciesNumberOfSitesUnderEnvironmentalMattersForWhichAcquiredCompanyHasLiability
/ us-gaap_GuaranteeObligationsByNatureAxis
= cag_BeatriceMember		                  
Number of sites under environmental matters for which acquired company is making payments           33cag_EnvironmentalLossContingenciesNumberOfSitesUnderEnvironmentalMattersForWhichAcquiredCompanyIsMakingPayments
/ us-gaap_GuaranteeObligationsByNatureAxis
= cag_BeatriceMember		                  
Reserves for Beatrice environmental matters           56,100,000us-gaap_AccrualForEnvironmentalLossContingencies
/ us-gaap_GuaranteeObligationsByNatureAxis
= cag_BeatriceMember		                  
Maximum period expected for disbursements on environmental matters           18 years                  
Potato Supply Agreement Guarantee                              
Guarantor Obligations [Line Items]                              
Amount of supplier loans effectively guaranteed           9,500,000cag_AmountOfSupplierLoansEffectivelyGuaranteed
/ us-gaap_GuaranteeObligationsByNatureAxis
= cag_PotatoSupplyAgreementGuaranteeMember		                  
Onion Supply Agreement Guarantee                              
Guarantor Obligations [Line Items]                              
Guarantee obligation under purchase agreement           25,000,000us-gaap_GuaranteeObligationsMaximumExposure
/ us-gaap_GuaranteeObligationsByNatureAxis
= cag_OnionSupplyAgreementGuaranteeMember		                  
Leases and Other Commercial Obligations Guarantee                              
Guarantor Obligations [Line Items]                              
Maximum period of guarantee (less than a year)           1 year                  
Guarantee obligation under purchase agreement           3,400,000us-gaap_GuaranteeObligationsMaximumExposure
/ us-gaap_GuaranteeObligationsByNatureAxis
= cag_LeasesAndOtherCommercialObligationsGuaranteeMember		                  
Threatened Litigation | Damage from Fire, Explosion or Other Hazard                              
Guarantor Obligations [Line Items]                              
Loss Contingency, Number of Plaintiffs         3us-gaap_LossContingencyNumberOfPlaintiffs
/ us-gaap_LitigationStatusAxis
= us-gaap_ThreatenedLitigationMember
/ us-gaap_LossContingenciesByNatureOfContingencyAxis
= us-gaap_DamageFromFireExplosionOrOtherHazardMember		                    
Subcontractor | Pending Litigation | Damage from Fire, Explosion or Other Hazard                              
Guarantor Obligations [Line Items]                              
Loss Contingency, Number of Plaintiffs                     2us-gaap_LossContingencyNumberOfPlaintiffs
/ cag_ContractorTypeAxis
= cag_SubcontractorMember
/ us-gaap_LitigationStatusAxis
= us-gaap_PendingLitigationMember
/ us-gaap_LossContingenciesByNatureOfContingencyAxis
= us-gaap_DamageFromFireExplosionOrOtherHazardMember		        
Primary Contractor | Pending Litigation | Damage from Fire, Explosion or Other Hazard                              
Guarantor Obligations [Line Items]                              
Loss Contingency, Number of Plaintiffs                     1us-gaap_LossContingencyNumberOfPlaintiffs
/ cag_ContractorTypeAxis
= cag_PrimaryContractorMember
/ us-gaap_LitigationStatusAxis
= us-gaap_PendingLitigationMember
/ us-gaap_LossContingenciesByNatureOfContingencyAxis
= us-gaap_DamageFromFireExplosionOrOtherHazardMember		        
California | Beatrice                              
Guarantor Obligations [Line Items]                              
Expected decision from court                             1,150,000,000us-gaap_LossContingencyRangeOfPossibleLossMaximum
/ us-gaap_GuaranteeObligationsByNatureAxis
= cag_BeatriceMember
/ us-gaap_StatementGeographicalAxis
= stpr_CA
Commercial Foods                              
Guarantor Obligations [Line Items]                              
Asset impairment charges                       8,900,000us-gaap_AssetImpairmentCharges
/ us-gaap_StatementBusinessSegmentsAxis
= cag_CommercialFoodsMember		 10,200,000us-gaap_AssetImpairmentCharges
/ us-gaap_StatementBusinessSegmentsAxis
= cag_CommercialFoodsMember		    
Gain on sale of land     5,100,000cag_Gainonsaleofland
/ us-gaap_StatementBusinessSegmentsAxis
= cag_CommercialFoodsMember		                        
Scenario, Forecast                              
Guarantor Obligations [Line Items]                              
Estimate of annual payment to third party in 2015                           $ 6,100,000cag_Estimateofannualpaymenttothirdpartyin2015
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioForecastMember