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PENSION AND POSTRETIREMENT BENEFITS (Narrative) (Detail) (USD $)
In Millions, unless otherwise specified
3 Months Ended 9 Months Ended
Aug. 24, 2014
Feb. 22, 2015
Feb. 22, 2015
Ardent Mills      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Special termination benefits expense $ 6.9us-gaap_DefinedBenefitPlanCostOfProvidingSpecialOrContractualTerminationBenefitRecognizedDuringPeriod
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Pension Benefits      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Employer contributions to pension plan and other postretirement plan   3.6us-gaap_DefinedBenefitPlanContributionsByEmployer
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10.0us-gaap_DefinedBenefitPlanContributionsByEmployer
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= us-gaap_PensionPlansDefinedBenefitMember
Further contribution to pension and other postretirement plan     2.9cag_DefinedBenefitPlansEstimatedFutureEmployerContributionsinRemainderofFiscalYear
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= us-gaap_PensionPlansDefinedBenefitMember
Postretirement Benefits      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Employer contributions to pension plan and other postretirement plan   3.9us-gaap_DefinedBenefitPlanContributionsByEmployer
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
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14.4us-gaap_DefinedBenefitPlanContributionsByEmployer
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Further contribution to pension and other postretirement plan     $ 11.1cag_DefinedBenefitPlansEstimatedFutureEmployerContributionsinRemainderofFiscalYear
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember