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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 $ 0.3us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationBeforeIncomeTax $ 13.2us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationBeforeIncomeTax $ 617.2us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationBeforeIncomeTax $ 100.7us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationBeforeIncomeTax        
Income (loss) from discontinued operations, net of tax (0.6)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax 10.8us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax 362.0us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax 66.6us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax        
Selling, general and administrative expenses 1,726.1us-gaap_SellingGeneralAndAdministrativeExpense 534.9us-gaap_SellingGeneralAndAdministrativeExpense 2,950.7us-gaap_SellingGeneralAndAdministrativeExpense 1,626.1us-gaap_SellingGeneralAndAdministrativeExpense        
Cash proceeds 11.0us-gaap_ProceedsFromSaleOfPropertyHeldForSale              
Ardent Mills                
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                
Cash contribution         49.0us-gaap_PaymentsToAcquireEquityMethodInvestments
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Ownership interest         44.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
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Proceeds from divestiture of business         391.4us-gaap_ProceedsFromDivestitureOfBusinesses
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Income (loss) from operations of discontinued operations before income taxes     625.6us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationBeforeIncomeTax
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Income (loss) from discontinued operations, net of tax     375.9us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax
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Three flour milling facilities                
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                
Proceeds from divestiture of business           163.0us-gaap_ProceedsFromDivestitureOfBusinesses
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Medallion                
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                
Proceeds from divestiture of business             32.0us-gaap_ProceedsFromDivestitureOfBusinesses
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Goodwill and intangible asset impairment charge, before tax 25.4us-gaap_GoodwillAndIntangibleAssetImpairment
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Goodwill and intangible asset impairment, after tax 15.2cag_GoodwillandIntangibleAssetImpairmentafterTax
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Lightlife                
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                
Proceeds from divestiture of business               54.7us-gaap_ProceedsFromDivestitureOfBusinesses
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Pre-tax gain on sale of business               32.1us-gaap_DiscontinuedOperationGainLossFromDisposalOfDiscontinuedOperationBeforeIncomeTax
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Gain on sale of business after-tax               19.8us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax
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= 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 3.5us-gaap_SellingGeneralAndAdministrativeExpense
/ us-gaap_FairValueByAssetClassAxis
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  10.8us-gaap_SellingGeneralAndAdministrativeExpense
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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 $ 745.6us-gaap_EquityMethodInvestments
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  $ 745.6us-gaap_EquityMethodInvestments
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