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BUSINESS SEGMENTS AND RELATED INFORMATION (Narrative) (Detail) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Feb. 22, 2015 | Feb. 22, 2015 Segment | Feb. 23, 2014 | May 25, 2014
Segment Reporting Information [Line Items] |  |  |  |
Number of reportable segments |  | 3 us-gaap_NumberOfReportableSegments |  |
Net derivative losses recognized in general corporate expenses |  | $ 101.3 us-gaap_DerivativeGainLossOnDerivativeNet |  |
Cumulative net derivative losses from economic hedges recognized in corporate | 42.2 cag_CumulativeDerivativeGainsLossesRecognizedNotYetReclassifiedToSegmentOperatingResults | 42.2 cag_CumulativeDerivativeGainsLossesRecognizedNotYetReclassifiedToSegmentOperatingResults |  |
Derivative gain to be reclassified to segment operating results thereafter |  | 59.1 cag_DerivativeGainLossOfPreviousYearToBeReclassifiedToSegmentOperatingResults |  |
Reclassify losses in 2014 |  | 25.5 cag_DerivativeGainsLossesToBeReclassifiedToSegmentOperatingResultsNextFiscalYear |  |
Reclassify losses in 2015 and thereafter |  | 16.7 cag_DerivativeGainLossToBeReclassifiedToSegmentOperatingResultsThereafter |  |
Percentage of consolidated net sales in consumer food segment accounted by Wal-Mart Stores, Inc. and its affiliates | 18.00%us-gaap_ConcentrationRiskPercentage1 | 19.00%us-gaap_ConcentrationRiskPercentage1 | 18.00%us-gaap_ConcentrationRiskPercentage1 |
Percentage of consolidated net receivables in commercial foods accounted by Wal-Mart Stores, Inc. and its affiliates | 17.00%cag_EntityWideReceivablesMajorCustomerAmountInPercentage | 17.00%cag_EntityWideReceivablesMajorCustomerAmountInPercentage |  | 16.00%cag_EntityWideReceivablesMajorCustomerAmountInPercentage
Consumer Foods |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net derivative losses recognized in general corporate expenses | 20.9 us-gaap_DerivativeGainLossOnDerivativeNet / us-gaap_StatementBusinessSegmentsAxis = cag_ConsumerFoodsMember | 18.6 us-gaap_DerivativeGainLossOnDerivativeNet / us-gaap_StatementBusinessSegmentsAxis = cag_ConsumerFoodsMember |  |
Private Brands |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net derivative losses recognized in general corporate expenses | 5.7 us-gaap_DerivativeGainLossOnDerivativeNet / us-gaap_StatementBusinessSegmentsAxis = cag_PrivateBrandsMember | 5.1 us-gaap_DerivativeGainLossOnDerivativeNet / us-gaap_StatementBusinessSegmentsAxis = cag_PrivateBrandsMember |  |
Commercial Segment |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net derivative losses recognized in general corporate expenses | $ (1.6)us-gaap_DerivativeGainLossOnDerivativeNet / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CommercialPortfolioSegmentMember | $ 1.4 us-gaap_DerivativeGainLossOnDerivativeNet / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CommercialPortfolioSegmentMember |  |

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