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BUSINESS SEGMENTS AND RELATED INFORMATION (Allocation of Net Derivative Gains (Losses) from Economic Hedges of Forecasted Commodity Consumption and Foreign Currency Risk) (Detail) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 6 Months Ended
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Nov. 23, 2014 | Nov. 24, 2013 | Nov. 23, 2014 | Nov. 24, 2013
Operating Statistics [Line Items] |  |  |  |
Derivative, Gain (Loss) on Derivative, Net |  |  | $ (61.2)us-gaap_DerivativeGainLossOnDerivativeNet |
Consumer Foods |  |  |  |
Operating Statistics [Line Items] |  |  |  |
Derivative, Gain (Loss) on Derivative, Net | 2.3 us-gaap_DerivativeGainLossOnDerivativeNet / us-gaap_StatementBusinessSegmentsAxis = cag_ConsumerFoodsMember |  |  |
Private Brands |  |  |  |
Operating Statistics [Line Items] |  |  |  |
Derivative, Gain (Loss) on Derivative, Net | 0.6 us-gaap_DerivativeGainLossOnDerivativeNet / us-gaap_StatementBusinessSegmentsAxis = cag_PrivateBrandsMember |  |  |
Commodity contracts |  |  |  |
Operating Statistics [Line Items] |  |  |  |
Derivative, Gain (Loss) on Derivative, Net | (22.9)us-gaap_DerivativeGainLossOnDerivativeNet / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember | (11.4)us-gaap_DerivativeGainLossOnDerivativeNet / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember | (61.2)us-gaap_DerivativeGainLossOnDerivativeNet / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember | (29.5)us-gaap_DerivativeGainLossOnDerivativeNet / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember
Commodity contracts | Consumer Foods |  |  |  |
Operating Statistics [Line Items] |  |  |  |
Derivative, Gain (Loss) on Derivative, Net | 0.5 us-gaap_DerivativeGainLossOnDerivativeNet / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember / us-gaap_StatementBusinessSegmentsAxis = cag_ConsumerFoodsMember | (0.6)us-gaap_DerivativeGainLossOnDerivativeNet / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember / us-gaap_StatementBusinessSegmentsAxis = cag_ConsumerFoodsMember | 4.2 us-gaap_DerivativeGainLossOnDerivativeNet / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember / us-gaap_StatementBusinessSegmentsAxis = cag_ConsumerFoodsMember | 1.3 us-gaap_DerivativeGainLossOnDerivativeNet / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember / us-gaap_StatementBusinessSegmentsAxis = cag_ConsumerFoodsMember
Commodity contracts | Commercial Foods |  |  |  |
Operating Statistics [Line Items] |  |  |  |
Derivative, Gain (Loss) on Derivative, Net | 3.0 us-gaap_DerivativeGainLossOnDerivativeNet / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember / us-gaap_StatementBusinessSegmentsAxis = cag_CommercialFoodsMember | (1.2)us-gaap_DerivativeGainLossOnDerivativeNet / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember / us-gaap_StatementBusinessSegmentsAxis = cag_CommercialFoodsMember | 6.0 us-gaap_DerivativeGainLossOnDerivativeNet / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember / us-gaap_StatementBusinessSegmentsAxis = cag_CommercialFoodsMember | 0.4 us-gaap_DerivativeGainLossOnDerivativeNet / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember / us-gaap_StatementBusinessSegmentsAxis = cag_CommercialFoodsMember
Commodity contracts | Private Brands |  |  |  |
Operating Statistics [Line Items] |  |  |  |
Derivative, Gain (Loss) on Derivative, Net | (1.5)us-gaap_DerivativeGainLossOnDerivativeNet / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember / us-gaap_StatementBusinessSegmentsAxis = cag_PrivateBrandsMember | (0.6)us-gaap_DerivativeGainLossOnDerivativeNet / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember / us-gaap_StatementBusinessSegmentsAxis = cag_PrivateBrandsMember | 3.8 us-gaap_DerivativeGainLossOnDerivativeNet / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember / us-gaap_StatementBusinessSegmentsAxis = cag_PrivateBrandsMember | (1.3)us-gaap_DerivativeGainLossOnDerivativeNet / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember / us-gaap_StatementBusinessSegmentsAxis = cag_PrivateBrandsMember
Operating Segments | Commodity contracts |  |  |  |
Operating Statistics [Line Items] |  |  |  |
Derivative, Gain (Loss) on Derivative, Net | 2.0 us-gaap_DerivativeGainLossOnDerivativeNet / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember | (2.4)us-gaap_DerivativeGainLossOnDerivativeNet / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember | 14.0 us-gaap_DerivativeGainLossOnDerivativeNet / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember | 0.4 us-gaap_DerivativeGainLossOnDerivativeNet / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember
Segment Reconciling Items | Commodity contracts |  |  |  |
Operating Statistics [Line Items] |  |  |  |
Derivative, Gain (Loss) on Derivative, Net | $ (24.9)us-gaap_DerivativeGainLossOnDerivativeNet / us-gaap_ConsolidationItemsAxis = us-gaap_MaterialReconcilingItemsMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember | $ (9.0)us-gaap_DerivativeGainLossOnDerivativeNet / us-gaap_ConsolidationItemsAxis = us-gaap_MaterialReconcilingItemsMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember | $ (75.2)us-gaap_DerivativeGainLossOnDerivativeNet / us-gaap_ConsolidationItemsAxis = us-gaap_MaterialReconcilingItemsMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember | $ (29.9)us-gaap_DerivativeGainLossOnDerivativeNet / us-gaap_ConsolidationItemsAxis = us-gaap_MaterialReconcilingItemsMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember

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