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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 | $ 51.2 us-gaap_DerivativeAssetFairValueGrossLiability |  | $ 51.2 us-gaap_DerivativeAssetFairValueGrossLiability |  |  | $ 13.0 us-gaap_DerivativeAssetFairValueGrossLiability
Derivative liability prior to offsetting to total derivative | 63.7 us-gaap_DerivativeLiabilityFairValueGrossAsset |  | 63.7 us-gaap_DerivativeLiabilityFairValueGrossAsset |  |  | 6.8 us-gaap_DerivativeLiabilityFairValueGrossAsset
Hedge for Anticipated Consumption of Commodity Inputs, Period |  |  | 36 months |  |  |
Unrealized derivative adjustments | 0 us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax | (8.1)us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax | 0 us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax | 31.2 us-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 |  |  |  |  |  | 6.2 us-gaap_DerivativeAssetCollateralObligationToReturnCashOffset
Change in Unrealized Loss on Hedged Item in Fair Value Hedge | 5.7 us-gaap_ChangeInUnrealizedGainLossOnHedgedItemInFairValueHedge1 |  | 5.8 us-gaap_ChangeInUnrealizedGainLossOnHedgedItemInFairValueHedge1 |  |  |
Maximum amount of loss due to the credit risk of the counterparties | 33.7 us-gaap_CreditDerivativeMaximumExposureUndiscounted |  | 33.7 us-gaap_CreditDerivativeMaximumExposureUndiscounted |  |  |
Derivative Liability, Collateral, Right to Reclaim Cash, Offset | 12.5 us-gaap_DerivativeLiabilityCollateralRightToReclaimCashOffset |  | 12.5 us-gaap_DerivativeLiabilityCollateralRightToReclaimCashOffset |  |  |
Open Commodity Purchase Contracts |  |  |  |  |  |
Derivative Financial Instruments [Line Items] |  |  |  |  |  |
Notional value of open commodity contracts | 1,500.0 invest_DerivativeNotionalAmount / us-gaap_DerivativeByNatureAxis = cag_OpenCommodityPurchaseContractsMember |  | 1,500.0 invest_DerivativeNotionalAmount / us-gaap_DerivativeByNatureAxis = cag_OpenCommodityPurchaseContractsMember |  |  | 1,400.0 invest_DerivativeNotionalAmount / us-gaap_DerivativeByNatureAxis = cag_OpenCommodityPurchaseContractsMember
Open commodity sales contracts |  |  |  |  |  |
Derivative Financial Instruments [Line Items] |  |  |  |  |  |
Notional value of open commodity contracts | 1,000.0 invest_DerivativeNotionalAmount / us-gaap_DerivativeByNatureAxis = cag_OpenCommoditySalesContractsMember |  | 1,000.0 invest_DerivativeNotionalAmount / us-gaap_DerivativeByNatureAxis = cag_OpenCommoditySalesContractsMember |  |  | 1,400.0 invest_DerivativeNotionalAmount / us-gaap_DerivativeByNatureAxis = cag_OpenCommoditySalesContractsMember
Interest rate contracts |  |  |  |  |  |
Derivative Financial Instruments [Line Items] |  |  |  |  |  |
Change in Unrealized Gain on Fair Value Hedging Instruments | 8.2 us-gaap_ChangeInUnrealizedGainLossOnFairValueHedgingInstruments1 / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateSwapMember |  | 8.9 us-gaap_ChangeInUnrealizedGainLossOnFairValueHedgingInstruments1 / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateSwapMember |  |  |
Cumulative adjustment to the fair value of the debt instruments that were hedged | 12.6 us-gaap_DerivativeInstrumentsLossRecognizedInOtherComprehensiveIncomeEffectivePortion / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateSwapMember |  |  |  |  |
Reduction of net interest expense due to impact of interest rate swap contracts | 0.2 cag_ReductionOfNetInterestExpenseDueToImpactOfInterestRateSwapContracts / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateSwapMember |  |  |  |  |
Proceeds from termination | 21.9 us-gaap_DerivativeCashReceivedOnHedge / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateSwapMember |  |  |  |  |
Accrued interest proceeds | 3.9 cag_DerivativeInstrumentAccruedInterestProceedsfromDiscontinuation / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateSwapMember |  |  |  |  |
Foreign exchange contracts |  |  |  |  |  |
Derivative Financial Instruments [Line Items] |  |  |  |  |  |
Notional value of open commodity contracts | 103.6 invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeContractMember |  | 103.6 invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeContractMember |  |  | 170.1 invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeContractMember
2043 Maturity | Cash Flow Hedging |  |  |  |  |  |
Derivative Financial Instruments [Line Items] |  |  |  |  |  |
Unrealized derivative adjustments |  |  |  |  | 4.2 us-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 | 2.5 cag_ReductionOfNetInterestExpenseDueToImpactOfInterestRateSwapContracts / us-gaap_IncomeStatementLocationAxis = us-gaap_SellingGeneralAndAdministrativeExpensesMember |  | 3.1 cag_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 | 5.4 us-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) | 3.0 us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = us-gaap_CashFlowHedgingMember / us-gaap_LongtermDebtTypeAxis = cag_A2043MaturityMember / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember |  | 3.0 us-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 | $ 54.9 cag_ReductionOfNetInterestExpenseDueToImpactOfInterestRateSwapContracts / us-gaap_IncomeStatementLocationAxis = us-gaap_SellingGeneralAndAdministrativeExpensesMember / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedNetGainLossFromDesignatedOrQualifyingCashFlowHedgesMember |  |  |  |  |

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- Definition Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=36458714&loc=d3e637-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=36458714&loc=d3e681-108580 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=36458714&loc=SL7669686-108580 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 31 -Article 5 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 + Details
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