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SHARE-BASED PAYMENTS (Narrative) (Details) (USD $)
In Millions, except Per Share data, unless otherwise specified
3 Months Ended 9 Months Ended
Feb. 22, 2015
Feb. 23, 2014
Feb. 22, 2015
Feb. 23, 2014
Stock Based Compensation Activity [Line Items]        
Total stock-based compensation expense $ 11.4us-gaap_AllocatedShareBasedCompensationExpense $ 11.7us-gaap_AllocatedShareBasedCompensationExpense $ 46.4us-gaap_AllocatedShareBasedCompensationExpense $ 45.9us-gaap_AllocatedShareBasedCompensationExpense
Stock option granted     3.8us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod  
Weighted average exercise price of stock options granted     $ 30.89cag_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrices  
Weighted average value of stock options granted during the first three quarters of fiscal 2014     $ 3.28us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue  
Performance period ending 2015        
Stock Based Compensation Activity [Line Items]        
Percentage of the targeted number of performance shares, minimum range and will be paid in shares of common stock     0.00%cag_PercentageOfTargetedNumberOfPerformanceSharesMinimumRangeAndWillBePaidInSharesOfCommonStock
/ us-gaap_PlanNameAxis
= cag_PerformancePeriodEndingTwoThousandFifteenMember
 
Percentage of the targeted number of performance shares, maximum range and will be paid in shares of common stock     220.00%cag_PercentageOfTargetedNumberOfPerformanceSharesMaximumRangeAndWillBePaidInSharesOfCommonStock
/ us-gaap_PlanNameAxis
= cag_PerformancePeriodEndingTwoThousandFifteenMember
 
Percentage of target incentive required payout     25.00%cag_PercentageOfTargetIncentiveRequiredPayout
/ us-gaap_PlanNameAxis
= cag_PerformancePeriodEndingTwoThousandFifteenMember
 
Performance period ending 2014        
Stock Based Compensation Activity [Line Items]        
Percentage of the targeted number of performance shares, minimum range and will be paid in shares of common stock     0.00%cag_PercentageOfTargetedNumberOfPerformanceSharesMinimumRangeAndWillBePaidInSharesOfCommonStock
/ us-gaap_PlanNameAxis
= cag_PerformancePeriodEndingTwoThousandFourteenMember
 
Percentage of the targeted number of performance shares, maximum range and will be paid in shares of common stock     220.00%cag_PercentageOfTargetedNumberOfPerformanceSharesMaximumRangeAndWillBePaidInSharesOfCommonStock
/ us-gaap_PlanNameAxis
= cag_PerformancePeriodEndingTwoThousandFourteenMember
 
Percentage of target incentive required payout     25.00%cag_PercentageOfTargetIncentiveRequiredPayout
/ us-gaap_PlanNameAxis
= cag_PerformancePeriodEndingTwoThousandFourteenMember
 
Restricted stock        
Stock Based Compensation Activity [Line Items]        
Stock granted, shares     0.9us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
 
Weighted average value of stock options granted     $ 31.36us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
 
Cash-settled restricted stock units        
Stock Based Compensation Activity [Line Items]        
Stock granted, shares     0.9us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= cag_CashSettledRestrictedStockUnitMember
 
Weighted average value of stock options granted     $ 30.89us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= cag_CashSettledRestrictedStockUnitMember
 
Performance shares        
Stock Based Compensation Activity [Line Items]        
Stock granted, shares     0.4us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
 
Weighted average value of stock options granted     $ 30.89us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
 
Subsidiaries        
Stock Based Compensation Activity [Line Items]        
Total stock-based compensation expense $ 0.3us-gaap_AllocatedShareBasedCompensationExpense
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
$ 0.2us-gaap_AllocatedShareBasedCompensationExpense
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
$ 0.9us-gaap_AllocatedShareBasedCompensationExpense
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
$ 2.3us-gaap_AllocatedShareBasedCompensationExpense
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember