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DERIVATIVE FINANCIAL INSTRUMENTS (Narrative) (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 9 Months Ended 3 Months Ended
Feb. 22, 2015
Feb. 23, 2014
Feb. 22, 2015
Feb. 23, 2014
Feb. 24, 2013
May 25, 2014
Derivative Financial Instruments [Line Items]            
Derivative asset prior to offsetting to total derivative $ 51.2us-gaap_DerivativeAssetFairValueGrossLiability   $ 51.2us-gaap_DerivativeAssetFairValueGrossLiability     $ 13.0us-gaap_DerivativeAssetFairValueGrossLiability
Derivative liability prior to offsetting to total derivative 63.7us-gaap_DerivativeLiabilityFairValueGrossAsset   63.7us-gaap_DerivativeLiabilityFairValueGrossAsset     6.8us-gaap_DerivativeLiabilityFairValueGrossAsset
Hedge for Anticipated Consumption of Commodity Inputs, Period     36 months      
Unrealized derivative adjustments 0us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax (8.1)us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax 0us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax 31.2us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax    
Unamortized amounts of deferred gain (loss) (261.6)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax   (261.6)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax     (134.3)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
Amounts representing a right to reclaim cash collateral included in prepaid expenses and other current assets           6.2us-gaap_DerivativeAssetCollateralObligationToReturnCashOffset
Change in Unrealized Loss on Hedged Item in Fair Value Hedge 5.7us-gaap_ChangeInUnrealizedGainLossOnHedgedItemInFairValueHedge1   5.8us-gaap_ChangeInUnrealizedGainLossOnHedgedItemInFairValueHedge1      
Maximum amount of loss due to the credit risk of the counterparties 33.7us-gaap_CreditDerivativeMaximumExposureUndiscounted   33.7us-gaap_CreditDerivativeMaximumExposureUndiscounted      
Derivative Liability, Collateral, Right to Reclaim Cash, Offset 12.5us-gaap_DerivativeLiabilityCollateralRightToReclaimCashOffset   12.5us-gaap_DerivativeLiabilityCollateralRightToReclaimCashOffset      
Open Commodity Purchase Contracts            
Derivative Financial Instruments [Line Items]            
Notional value of open commodity contracts 1,500.0invest_DerivativeNotionalAmount
/ us-gaap_DerivativeByNatureAxis
= cag_OpenCommodityPurchaseContractsMember
  1,500.0invest_DerivativeNotionalAmount
/ us-gaap_DerivativeByNatureAxis
= cag_OpenCommodityPurchaseContractsMember
    1,400.0invest_DerivativeNotionalAmount
/ us-gaap_DerivativeByNatureAxis
= cag_OpenCommodityPurchaseContractsMember
Open commodity sales contracts            
Derivative Financial Instruments [Line Items]            
Notional value of open commodity contracts 1,000.0invest_DerivativeNotionalAmount
/ us-gaap_DerivativeByNatureAxis
= cag_OpenCommoditySalesContractsMember
  1,000.0invest_DerivativeNotionalAmount
/ us-gaap_DerivativeByNatureAxis
= cag_OpenCommoditySalesContractsMember
    1,400.0invest_DerivativeNotionalAmount
/ us-gaap_DerivativeByNatureAxis
= cag_OpenCommoditySalesContractsMember
Interest rate contracts            
Derivative Financial Instruments [Line Items]            
Change in Unrealized Gain on Fair Value Hedging Instruments 8.2us-gaap_ChangeInUnrealizedGainLossOnFairValueHedgingInstruments1
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember
  8.9us-gaap_ChangeInUnrealizedGainLossOnFairValueHedgingInstruments1
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember
     
Cumulative adjustment to the fair value of the debt instruments that were hedged 12.6us-gaap_DerivativeInstrumentsLossRecognizedInOtherComprehensiveIncomeEffectivePortion
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember
         
Reduction of net interest expense due to impact of interest rate swap contracts 0.2cag_ReductionOfNetInterestExpenseDueToImpactOfInterestRateSwapContracts
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember
         
Proceeds from termination 21.9us-gaap_DerivativeCashReceivedOnHedge
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember
         
Accrued interest proceeds 3.9cag_DerivativeInstrumentAccruedInterestProceedsfromDiscontinuation
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember
         
Foreign exchange contracts            
Derivative Financial Instruments [Line Items]            
Notional value of open commodity contracts 103.6invest_DerivativeNotionalAmount
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForeignExchangeContractMember
  103.6invest_DerivativeNotionalAmount
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForeignExchangeContractMember
    170.1invest_DerivativeNotionalAmount
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForeignExchangeContractMember
2043 Maturity | Cash Flow Hedging            
Derivative Financial Instruments [Line Items]            
Unrealized derivative adjustments         4.2us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= us-gaap_CashFlowHedgingMember
/ us-gaap_LongtermDebtTypeAxis
= cag_A2043MaturityMember
 
2023 Maturity | Cash Flow Hedging            
Derivative Financial Instruments [Line Items]            
Unrealized derivative adjustments         (2.0)us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= us-gaap_CashFlowHedgingMember
/ us-gaap_LongtermDebtTypeAxis
= cag_A2023MaturityMember
 
Selling, general and administrative expense            
Derivative Financial Instruments [Line Items]            
Reduction of net interest expense due to impact of interest rate swap contracts 2.5cag_ReductionOfNetInterestExpenseDueToImpactOfInterestRateSwapContracts
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_SellingGeneralAndAdministrativeExpensesMember
  3.1cag_ReductionOfNetInterestExpenseDueToImpactOfInterestRateSwapContracts
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_SellingGeneralAndAdministrativeExpensesMember
     
Selling, general and administrative expense | Interest rate contracts            
Derivative Financial Instruments [Line Items]            
Change in Unrealized Gain on Fair Value Hedging Instruments 5.4us-gaap_ChangeInUnrealizedGainLossOnFairValueHedgingInstruments1
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_SellingGeneralAndAdministrativeExpensesMember
         
Cash flow hedges | 2043 Maturity | Cash Flow Hedging            
Derivative Financial Instruments [Line Items]            
Unamortized amounts of deferred gain (loss) 3.0us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= us-gaap_CashFlowHedgingMember
/ us-gaap_LongtermDebtTypeAxis
= cag_A2043MaturityMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember
  3.0us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= us-gaap_CashFlowHedgingMember
/ us-gaap_LongtermDebtTypeAxis
= cag_A2043MaturityMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember
     
Cash flow hedges | 2023 Maturity | Cash Flow Hedging            
Derivative Financial Instruments [Line Items]            
Unamortized amounts of deferred gain (loss) (1.4)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= us-gaap_CashFlowHedgingMember
/ us-gaap_LongtermDebtTypeAxis
= cag_A2023MaturityMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember
  (1.4)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= us-gaap_CashFlowHedgingMember
/ us-gaap_LongtermDebtTypeAxis
= cag_A2023MaturityMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember
     
Cash flow hedges | Selling, general and administrative expense            
Derivative Financial Instruments [Line Items]            
Reduction of net interest expense due to impact of interest rate swap contracts $ 54.9cag_ReductionOfNetInterestExpenseDueToImpactOfInterestRateSwapContracts
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_SellingGeneralAndAdministrativeExpensesMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember