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DISCONTINUED OPERATIONS, OTHER ASSETS HELD FOR SALE, AND THE FORMATION OF ARDENT MILLS (Narrative) (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 6 Months Ended | 0 Months Ended | 12 Months Ended | 3 Months Ended
--- | --- | --- | --- | --- | ---
Nov. 23, 2014 | Nov. 24, 2013 | Nov. 23, 2014 | Nov. 24, 2013 | May 29, 2014 | May 25, 2014 | May 25, 2014
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |
Income (loss) from operations of discontinued operations before income taxes | $ 3.4 us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationBeforeIncomeTax | $ 68.1 us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationBeforeIncomeTax | $ 616.9 us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationBeforeIncomeTax | $ 87.5 us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationBeforeIncomeTax |  |  |
Income (loss) from discontinued operations, net of tax | (10.7)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax | 42.0 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax | 362.6 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax | 55.8 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax |  |  |
Total equity method investment earnings | 732.6 us-gaap_SellingGeneralAndAdministrativeExpense | 553.1 us-gaap_SellingGeneralAndAdministrativeExpense | 1,224.6 us-gaap_SellingGeneralAndAdministrativeExpense | 1,091.2 us-gaap_SellingGeneralAndAdministrativeExpense |  |  |
Discontinued Operation, Provision for Loss (Gain) on Disposal, before Income Tax | (0.8)us-gaap_DiscontinuedOperationProvisionForLossGainOnDisposalBeforeIncomeTax | (32.1)us-gaap_DiscontinuedOperationProvisionForLossGainOnDisposalBeforeIncomeTax | (627.3)us-gaap_DiscontinuedOperationProvisionForLossGainOnDisposalBeforeIncomeTax | (32.1)us-gaap_DiscontinuedOperationProvisionForLossGainOnDisposalBeforeIncomeTax |  |  |
Ardent Mills |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |
Cash contribution |  |  |  |  | 49.0 us-gaap_PaymentsToAcquireEquityMethodInvestments / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = cag_ArdentMillsMember |  |
Equity Method Investment, Ownership Percentage |  |  |  |  | 44.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = cag_ArdentMillsMember |  |
Proceeds from Divestiture of Businesses |  |  |  |  | 391.4 us-gaap_ProceedsFromDivestitureOfBusinesses / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = cag_ArdentMillsMember |  |
Income (loss) from operations of discontinued operations before income taxes |  |  | 625.6 us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationBeforeIncomeTax / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = cag_ArdentMillsMember |  |  |  |
Income (loss) from discontinued operations, net of tax |  |  | 375.9 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = cag_ArdentMillsMember |  |  |  |
Three flour milling facilities |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |
Proceeds from Divestiture of Businesses |  |  |  |  |  | 163.0 us-gaap_ProceedsFromDivestitureOfBusinesses / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = cag_ThreeflourmillingfacilitiesMember |
Medallion |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |
Proceeds from Divestiture of Businesses |  |  |  |  |  |  | 32.0 us-gaap_ProceedsFromDivestitureOfBusinesses / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = cag_MedallionMember
Lightlife |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |
Proceeds from Divestiture of Businesses |  | 54.7 us-gaap_ProceedsFromDivestitureOfBusinesses / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = cag_LightlifeMember |  |  |  |  |
Equity Method Investment | Ardent Mills |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |
Total equity method investment earnings | 3.5 us-gaap_SellingGeneralAndAdministrativeExpense / us-gaap_FairValueByAssetClassAxis = us-gaap_EquityMethodInvestmentsMember / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = cag_ArdentMillsMember |  | 7.3 us-gaap_SellingGeneralAndAdministrativeExpense / us-gaap_FairValueByAssetClassAxis = us-gaap_EquityMethodInvestmentsMember / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = cag_ArdentMillsMember |  |  |  |
Other Assets | Ardent Mills |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |
Carrying value of equity method investment | $ 746.7 us-gaap_EquityMethodInvestments / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherAssetsMember / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = cag_ArdentMillsMember |  | $ 746.7 us-gaap_EquityMethodInvestments / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherAssetsMember / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = cag_ArdentMillsMember |  |  |  |

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