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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 | 9 Months Ended
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Feb. 22, 2015 | Feb. 23, 2014 | Feb. 22, 2015 | Feb. 23, 2014
Operating Statistics [Line Items] |  |  |  |
Derivative, Gain (Loss) on Derivative, Net |  |  | $ (101.3)us-gaap_DerivativeGainLossOnDerivativeNet |
Consumer Foods |  |  |  |
Operating Statistics [Line Items] |  |  |  |
Derivative, Gain (Loss) on Derivative, Net | (20.9)us-gaap_DerivativeGainLossOnDerivativeNet / us-gaap_StatementBusinessSegmentsAxis = cag_ConsumerFoodsMember |  | (18.6)us-gaap_DerivativeGainLossOnDerivativeNet / us-gaap_StatementBusinessSegmentsAxis = cag_ConsumerFoodsMember |
Private Brands |  |  |  |
Operating Statistics [Line Items] |  |  |  |
Derivative, Gain (Loss) on Derivative, Net | (5.7)us-gaap_DerivativeGainLossOnDerivativeNet / us-gaap_StatementBusinessSegmentsAxis = cag_PrivateBrandsMember |  | (5.1)us-gaap_DerivativeGainLossOnDerivativeNet / us-gaap_StatementBusinessSegmentsAxis = cag_PrivateBrandsMember |
Commodity contracts |  |  |  |
Operating Statistics [Line Items] |  |  |  |
Derivative, Gain (Loss) on Derivative, Net | (40.1)us-gaap_DerivativeGainLossOnDerivativeNet / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember | 42.6 us-gaap_DerivativeGainLossOnDerivativeNet / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember | (101.3)us-gaap_DerivativeGainLossOnDerivativeNet / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember | 13.1 us-gaap_DerivativeGainLossOnDerivativeNet / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember
Commodity contracts | Consumer Foods |  |  |  |
Operating Statistics [Line Items] |  |  |  |
Derivative, Gain (Loss) on Derivative, Net | (30.9)us-gaap_DerivativeGainLossOnDerivativeNet / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember / us-gaap_StatementBusinessSegmentsAxis = cag_ConsumerFoodsMember | (4.4)us-gaap_DerivativeGainLossOnDerivativeNet / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember / us-gaap_StatementBusinessSegmentsAxis = cag_ConsumerFoodsMember | (26.7)us-gaap_DerivativeGainLossOnDerivativeNet / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember / us-gaap_StatementBusinessSegmentsAxis = cag_ConsumerFoodsMember | (3.1)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 | (4.8)us-gaap_DerivativeGainLossOnDerivativeNet / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember / us-gaap_StatementBusinessSegmentsAxis = cag_CommercialFoodsMember | 0.5 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 | 0.9 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 | (10.5)us-gaap_DerivativeGainLossOnDerivativeNet / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember / us-gaap_StatementBusinessSegmentsAxis = cag_PrivateBrandsMember | (5.9)us-gaap_DerivativeGainLossOnDerivativeNet / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember / us-gaap_StatementBusinessSegmentsAxis = cag_PrivateBrandsMember | (6.7)us-gaap_DerivativeGainLossOnDerivativeNet / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember / us-gaap_StatementBusinessSegmentsAxis = cag_PrivateBrandsMember | (7.2)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 | (46.2)us-gaap_DerivativeGainLossOnDerivativeNet / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember | (9.8)us-gaap_DerivativeGainLossOnDerivativeNet / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember | (32.2)us-gaap_DerivativeGainLossOnDerivativeNet / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember | (9.4)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 | $ 6.1 us-gaap_DerivativeGainLossOnDerivativeNet / us-gaap_ConsolidationItemsAxis = us-gaap_MaterialReconcilingItemsMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember | $ 52.4 us-gaap_DerivativeGainLossOnDerivativeNet / us-gaap_ConsolidationItemsAxis = us-gaap_MaterialReconcilingItemsMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember | $ (69.1)us-gaap_DerivativeGainLossOnDerivativeNet / us-gaap_ConsolidationItemsAxis = us-gaap_MaterialReconcilingItemsMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember | $ 22.5 us-gaap_DerivativeGainLossOnDerivativeNet / us-gaap_ConsolidationItemsAxis = us-gaap_MaterialReconcilingItemsMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember

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