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DERIVATIVE FINANCIAL INSTRUMENTS (Narrative) (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 6 Months Ended
Nov. 23, 2014
Nov. 24, 2013
Nov. 23, 2014
Nov. 24, 2013
May 25, 2014
Derivative Financial Instruments [Line Items]          
Derivative asset prior to offsetting to total derivative $ 15.5us-gaap_DerivativeAssetFairValueGrossLiability   $ 15.5us-gaap_DerivativeAssetFairValueGrossLiability   $ 13.0us-gaap_DerivativeAssetFairValueGrossLiability
Derivative liability prior to offsetting to total derivative 28.1us-gaap_DerivativeLiabilityFairValueGrossAsset   28.1us-gaap_DerivativeLiabilityFairValueGrossAsset   6.8us-gaap_DerivativeLiabilityFairValueGrossAsset
Hedge for Anticipated Consumption of Commodity Inputs, Period     36 months    
Unrealized derivative adjustments 0us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax (6.2)us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax 0us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax 39.3us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax  
Unamortized amounts of deferred gain (loss) (179.7)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax   (179.7)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 2.6us-gaap_ChangeInUnrealizedGainLossOnHedgedItemInFairValueHedge1   0.1us-gaap_ChangeInUnrealizedGainLossOnHedgedItemInFairValueHedge1    
Reduction of net interest expense due to impact of interest rate swap contracts 0.3cag_ReductionOfNetInterestExpenseDueToImpactOfInterestRateSwapContracts   0.6cag_ReductionOfNetInterestExpenseDueToImpactOfInterestRateSwapContracts    
Maximum amount of loss due to the credit risk of the counterparties 20.7us-gaap_CreditDerivativeMaximumExposureUndiscounted   20.7us-gaap_CreditDerivativeMaximumExposureUndiscounted    
Derivative Liability, Collateral, Right to Reclaim Cash, Offset 12.6us-gaap_DerivativeLiabilityCollateralRightToReclaimCashOffset   12.6us-gaap_DerivativeLiabilityCollateralRightToReclaimCashOffset    
Open Commodity Purchase Contracts          
Derivative Financial Instruments [Line Items]          
Notional value of open commodity contracts 1,300.0invest_DerivativeNotionalAmount
/ us-gaap_DerivativeByNatureAxis
= cag_OpenCommodityPurchaseContractsMember
  1,300.0invest_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 1,200.0invest_DerivativeNotionalAmount
/ us-gaap_DerivativeByNatureAxis
= cag_OpenCommoditySalesContractsMember
  1,200.0invest_DerivativeNotionalAmount
/ us-gaap_DerivativeByNatureAxis
= cag_OpenCommoditySalesContractsMember
  1,400.0invest_DerivativeNotionalAmount
/ us-gaap_DerivativeByNatureAxis
= cag_OpenCommoditySalesContractsMember
Foreign exchange contracts          
Derivative Financial Instruments [Line Items]          
Notional value of open commodity contracts 105.2invest_DerivativeNotionalAmount
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForeignExchangeContractMember
  105.2invest_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 | Interest rate contracts          
Derivative Financial Instruments [Line Items]          
Change in Unrealized Gain on Fair Value Hedging Instruments 2.9us-gaap_ChangeInUnrealizedGainLossOnFairValueHedgingInstruments1
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_SellingGeneralAndAdministrativeExpensesMember
  0.7us-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