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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 | 9 Months Ended | 0 Months Ended | 12 Months Ended | 3 Months Ended
--- | --- | --- | --- | --- | ---
Feb. 22, 2015 | Feb. 23, 2014 | Feb. 22, 2015 | Feb. 23, 2014 | May 29, 2014 | May 25, 2014 | May 25, 2014 | Nov. 24, 2013
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 | $ 0.3 us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationBeforeIncomeTax | $ 13.2 us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationBeforeIncomeTax | $ 617.2 us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationBeforeIncomeTax | $ 100.7 us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationBeforeIncomeTax |  |  |  |
Income (loss) from discontinued operations, net of tax | (0.6)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax | 10.8 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax | 362.0 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax | 66.6 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax |  |  |  |
Selling, general and administrative expenses | 1,726.1 us-gaap_SellingGeneralAndAdministrativeExpense | 534.9 us-gaap_SellingGeneralAndAdministrativeExpense | 2,950.7 us-gaap_SellingGeneralAndAdministrativeExpense | 1,626.1 us-gaap_SellingGeneralAndAdministrativeExpense |  |  |  |
Cash proceeds | 11.0 us-gaap_ProceedsFromSaleOfPropertyHeldForSale |  |  |  |  |  |  |
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 |  |  |
Ownership interest |  |  |  |  | 44.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = cag_ArdentMillsMember |  |  |
Proceeds from divestiture of business |  |  |  |  | 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 business |  |  |  |  |  | 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 business |  |  |  |  |  |  | 32.0 us-gaap_ProceedsFromDivestitureOfBusinesses / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = cag_MedallionMember |
Goodwill and intangible asset impairment charge, before tax | 25.4 us-gaap_GoodwillAndIntangibleAssetImpairment / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = cag_MedallionMember |  |  |  |  |  |  |
Goodwill and intangible asset impairment, after tax | 15.2 cag_GoodwillandIntangibleAssetImpairmentafterTax / 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 business |  |  |  |  |  |  |  | 54.7 us-gaap_ProceedsFromDivestitureOfBusinesses / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = cag_LightlifeMember
Pre-tax gain on sale of business |  |  |  |  |  |  |  | 32.1 us-gaap_DiscontinuedOperationGainLossFromDisposalOfDiscontinuedOperationBeforeIncomeTax / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = cag_LightlifeMember
Gain on sale of business after-tax |  |  |  |  |  |  |  | 19.8 us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax / 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] |  |  |  |  |  |  |  |
Selling, general and administrative expenses | 3.5 us-gaap_SellingGeneralAndAdministrativeExpense / us-gaap_FairValueByAssetClassAxis = us-gaap_EquityMethodInvestmentsMember / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = cag_ArdentMillsMember |  | 10.8 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 | $ 745.6 us-gaap_EquityMethodInvestments / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherAssetsMember / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = cag_ArdentMillsMember |  | $ 745.6 us-gaap_EquityMethodInvestments / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherAssetsMember / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = cag_ArdentMillsMember |  |  |  |  |

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