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CONTINGENCIES (Details) (USD $) | 3 Months Ended | 6 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 | Nov. 23, 2014 | Nov. 24, 2013 | May 25, 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 |  |  |  | $ 40,800,000 cag_LoanPurchaseUnderAgreement |  |  |  |  |  | $ 40,800,000 cag_LoanPurchaseUnderAgreement |  |  |  |  |  |
Asset impairment charges |  |  |  |  |  | 250,400,000 us-gaap_AssetImpairmentCharges | 14,800,000 us-gaap_AssetImpairmentCharges |  |  |  |  |  |  |  |  |
Face value of federal income tax credits | 26,700,000 us-gaap_TaxCreditCarryforwardAmount |  |  |  |  | 26,700,000 us-gaap_TaxCreditCarryforwardAmount |  |  |  |  |  |  |  |  |  |
Dispute coverage charge with insurance carrier |  |  |  |  |  |  |  |  | 24,800,000 us-gaap_LossContingencyLossInPeriod |  |  |  |  |  |  |
Loss Contingency Accrual, Period Increase (Decrease) | 1,200,000 us-gaap_LossContingencyAccrualCarryingValuePeriodIncreaseDecrease | 5,800,000 us-gaap_LossContingencyAccrualCarryingValuePeriodIncreaseDecrease | 6,700,000 us-gaap_LossContingencyAccrualCarryingValuePeriodIncreaseDecrease |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from Legal Settlements |  |  | 3,500,000 us-gaap_ProceedsFromLegalSettlements | 25,000,000 us-gaap_ProceedsFromLegalSettlements |  |  |  |  |  |  |  |  |  |  |  |
Gain (Loss) Related to Litigation Settlement |  |  |  | 25,000,000 us-gaap_GainLossRelatedToLitigationSettlement |  |  |  |  |  |  |  |  |  |  |  |
Punitive award against the company |  |  |  |  | 7,000,000 us-gaap_LossContingencyDamagesAwardedValue |  |  |  |  |  |  |  |  |  |  |
Minimum annual payments to third party |  |  |  |  |  |  |  | 2,500,000 cag_Minimumannualpaymentstothirdparty |  |  |  |  |  |  |  |
Litigation Matter |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dispute coverage charge with insurance carrier |  |  |  |  |  |  |  |  |  | 7,500,000 us-gaap_LossContingencyLossInPeriod / cag_ContingenciesLitigationAxis = cag_LitigationMatterMember | 17,500,000 us-gaap_LossContingencyLossInPeriod / cag_ContingenciesLitigationAxis = cag_LitigationMatterMember |  |  |  |  |
Compensatory Damages |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unfavorable verdict |  |  |  |  | 77,500,000 cag_UnfavorableVerdict / cag_CommitmentsAndContingenciesAxis = cag_CompensatoryDamagesMember |  |  |  |  |  |  |  |  |  |  |
Punitive Damages |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unfavorable verdict |  |  |  |  | 100,000,000 cag_UnfavorableVerdict / cag_CommitmentsAndContingenciesAxis = cag_PunitiveDamagesMember |  |  |  |  |  |  |  |  |  |  |
Beatrice |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of sites under environmental matters for which acquired company has a liability |  |  |  |  |  | 37 cag_EnvironmentalLossContingenciesNumberOfSitesUnderEnvironmentalMattersForWhichAcquiredCompanyHasLiability / us-gaap_GuaranteeObligationsByNatureAxis = cag_BeatriceMember |  |  |  |  |  |  |  |  |  |
Number of sites under environmental matters for which acquired company is making payments |  |  |  |  |  | 33 cag_EnvironmentalLossContingenciesNumberOfSitesUnderEnvironmentalMattersForWhichAcquiredCompanyIsMakingPayments / us-gaap_GuaranteeObligationsByNatureAxis = cag_BeatriceMember |  |  |  |  |  |  |  |  |  |
Reserves for Beatrice environmental matters | 57,000,000 us-gaap_AccrualForEnvironmentalLossContingencies / us-gaap_GuaranteeObligationsByNatureAxis = cag_BeatriceMember |  |  |  |  | 57,000,000 us-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 | 17,800,000 cag_AmountOfSupplierLoansEffectivelyGuaranteed / us-gaap_GuaranteeObligationsByNatureAxis = cag_PotatoSupplyAgreementGuaranteeMember |  |  |  |  | 17,800,000 cag_AmountOfSupplierLoansEffectivelyGuaranteed / us-gaap_GuaranteeObligationsByNatureAxis = cag_PotatoSupplyAgreementGuaranteeMember |  |  |  |  |  |  |  |  |  |
Onion Supply Agreement Guarantee |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Guarantee obligation under purchase agreement | 25,000,000 us-gaap_GuaranteeObligationsMaximumExposure / us-gaap_GuaranteeObligationsByNatureAxis = cag_OnionSupplyAgreementGuaranteeMember |  |  |  |  | 25,000,000 us-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 | 4,100,000 us-gaap_GuaranteeObligationsMaximumExposure / us-gaap_GuaranteeObligationsByNatureAxis = cag_LeasesAndOtherCommercialObligationsGuaranteeMember |  |  |  |  | 4,100,000 us-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 |  |  |  |  | 3 us-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 |  |  |  |  |  |  |  |  |  |  |  | 2 us-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 |  |  |  |  |  |  |  |  |  |  |  | 1 us-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 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,150,000,000 us-gaap_LossContingencyRangeOfPossibleLossMaximum / us-gaap_GuaranteeObligationsByNatureAxis = cag_BeatriceMember / us-gaap_StatementGeographicalAxis = stpr_CA
Commercial Foods |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Asset impairment charges |  |  |  |  |  |  |  |  |  |  |  |  | 8,900,000 us-gaap_AssetImpairmentCharges / us-gaap_StatementBusinessSegmentsAxis = cag_CommercialFoodsMember | 10,200,000 us-gaap_AssetImpairmentCharges / us-gaap_StatementBusinessSegmentsAxis = cag_CommercialFoodsMember |  |
Gain on sale of land |  |  | 5,100,000 cag_Gainonsaleofland / us-gaap_StatementBusinessSegmentsAxis = cag_CommercialFoodsMember |  |  |  |  |  |  |  |  |  |  |  |  |
Scenario, Forecast |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimate of annual payment to third party in 2015 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 6,000,000 cag_Estimateofannualpaymenttothirdpartyin2015 / us-gaap_StatementScenarioAxis = us-gaap_ScenarioForecastMember |

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