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RESTRUCTURING ACTIVITIES (Narrative) (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 6 Months Ended | 18 Months Ended | 22 Months Ended | 30 Months Ended
--- | --- | --- | --- | --- | ---
Nov. 23, 2014 | Nov. 24, 2013 | Nov. 23, 2014 | Nov. 24, 2013 | Nov. 23, 2014 | Nov. 23, 2014 | Nov. 23, 2014
SCAE Plan |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Restructuring and Related Cost, Approved Cost |  |  |  |  |  |  | $ 325.0 cag_RestructuringandRelatedCostApprovedCost / us-gaap_RestructuringPlanAxis = cag_SCAEPlanMember
Restructuring and Related Cost, Expected Cost |  |  |  |  |  |  | 217.6 us-gaap_RestructuringAndRelatedCostExpectedCost / us-gaap_RestructuringPlanAxis = cag_SCAEPlanMember
Restructuring and Related Cost, Incurred Cost | 17.4 us-gaap_RestructuringAndRelatedCostIncurredCost / us-gaap_RestructuringPlanAxis = cag_SCAEPlanMember | 7.3 us-gaap_RestructuringAndRelatedCostIncurredCost / us-gaap_RestructuringPlanAxis = cag_SCAEPlanMember | 38.5 us-gaap_RestructuringAndRelatedCostIncurredCost / us-gaap_RestructuringPlanAxis = cag_SCAEPlanMember | 14.6 us-gaap_RestructuringAndRelatedCostIncurredCost / us-gaap_RestructuringPlanAxis = cag_SCAEPlanMember |  |  |
Restructuring And Related Cost Expected Cash Outflows | 7.5 cag_RestructuringAndRelatedCostExpectedCashOutflows / us-gaap_RestructuringPlanAxis = cag_SCAEPlanMember |  | 17.4 cag_RestructuringAndRelatedCostExpectedCashOutflows / us-gaap_RestructuringPlanAxis = cag_SCAEPlanMember |  |  | 106.5 cag_RestructuringAndRelatedCostExpectedCashOutflows / us-gaap_RestructuringPlanAxis = cag_SCAEPlanMember | 157.1 cag_RestructuringAndRelatedCostExpectedCashOutflows / us-gaap_RestructuringPlanAxis = cag_SCAEPlanMember
Restructuring And Related Cost Expected Noncash Charges | 9.9 cag_RestructuringAndRelatedCostExpectedNoncashCharges / us-gaap_RestructuringPlanAxis = cag_SCAEPlanMember |  | 21.1 cag_RestructuringAndRelatedCostExpectedNoncashCharges / us-gaap_RestructuringPlanAxis = cag_SCAEPlanMember |  | 60.5 cag_RestructuringAndRelatedCostExpectedNoncashCharges / us-gaap_RestructuringPlanAxis = cag_SCAEPlanMember | 44.1 cag_RestructuringAndRelatedCostExpectedNoncashCharges / us-gaap_RestructuringPlanAxis = cag_SCAEPlanMember |
Acquisition Related Restructuring |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Restructured and related cost incurred to date |  |  |  |  |  | 23.7 us-gaap_RestructuringAndRelatedCostCostIncurredToDate / us-gaap_RestructuringPlanAxis = cag_AcquisitionRelatedRestructuringMember |
Acquisition Related Restructuring | Consumer Foods |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Restructuring and Related Cost, Incurred Cost | 0.1 us-gaap_RestructuringAndRelatedCostIncurredCost / us-gaap_RestructuringPlanAxis = cag_AcquisitionRelatedRestructuringMember / us-gaap_StatementBusinessSegmentsAxis = cag_ConsumerFoodsMember | 2.4 us-gaap_RestructuringAndRelatedCostIncurredCost / us-gaap_RestructuringPlanAxis = cag_AcquisitionRelatedRestructuringMember / us-gaap_StatementBusinessSegmentsAxis = cag_ConsumerFoodsMember | 0.3 us-gaap_RestructuringAndRelatedCostIncurredCost / us-gaap_RestructuringPlanAxis = cag_AcquisitionRelatedRestructuringMember / us-gaap_StatementBusinessSegmentsAxis = cag_ConsumerFoodsMember | 3.3 us-gaap_RestructuringAndRelatedCostIncurredCost / us-gaap_RestructuringPlanAxis = cag_AcquisitionRelatedRestructuringMember / us-gaap_StatementBusinessSegmentsAxis = cag_ConsumerFoodsMember |  |  |
Restructured and related cost incurred to date |  |  |  |  |  | 21.2 us-gaap_RestructuringAndRelatedCostCostIncurredToDate / us-gaap_RestructuringPlanAxis = cag_AcquisitionRelatedRestructuringMember / us-gaap_StatementBusinessSegmentsAxis = cag_ConsumerFoodsMember |
Acquisition Related Restructuring | Corporate |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Restructured and related cost incurred to date |  |  |  |  |  | 2.5 us-gaap_RestructuringAndRelatedCostCostIncurredToDate / us-gaap_RestructuringPlanAxis = cag_AcquisitionRelatedRestructuringMember / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateNonSegmentMember |
Ralcorp Pre-acquisition Restructuring |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Restructuring and Related Cost, Incurred Cost |  | 1.3 us-gaap_RestructuringAndRelatedCostIncurredCost / us-gaap_RestructuringPlanAxis = cag_RalcorpPreacquisitionRestructuringMember |  | 2.6 us-gaap_RestructuringAndRelatedCostIncurredCost / us-gaap_RestructuringPlanAxis = cag_RalcorpPreacquisitionRestructuringMember |  |  |
Restructuring And Related Cost Expected Cash Outflows | 1.9 cag_RestructuringAndRelatedCostExpectedCashOutflows / us-gaap_RestructuringPlanAxis = cag_RalcorpPreacquisitionRestructuringMember |  |  |  |  |  |
Restructuring And Related Cost Expected Noncash Charges | 1.8 cag_RestructuringAndRelatedCostExpectedNoncashCharges / us-gaap_RestructuringPlanAxis = cag_RalcorpPreacquisitionRestructuringMember |  |  |  |  |  |
Restructured and related cost incurred to date |  |  |  |  |  | 3.7 us-gaap_RestructuringAndRelatedCostCostIncurredToDate / us-gaap_RestructuringPlanAxis = cag_RalcorpPreacquisitionRestructuringMember |
Ralcorp Pre-acquisition Restructuring | Corporate |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Restructured and related cost incurred to date |  |  |  |  |  | 0.2 us-gaap_RestructuringAndRelatedCostCostIncurredToDate / us-gaap_RestructuringPlanAxis = cag_RalcorpPreacquisitionRestructuringMember / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateNonSegmentMember |
Ralcorp Pre-acquisition Restructuring | Private Brands |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Restructured and related cost incurred to date |  |  |  |  |  | $ 3.5 us-gaap_RestructuringAndRelatedCostCostIncurredToDate / us-gaap_RestructuringPlanAxis = cag_RalcorpPreacquisitionRestructuringMember / us-gaap_StatementBusinessSegmentsAxis = cag_PrivateBrandsMember |

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