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DISCONTINUED OPERATIONS, OTHER ASSETS HELD FOR SALE, AND THE FORMATION OF ARDENT MILLS (Details) (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
Discontinued Operations and Disposal Groups [Abstract] |  |  |  |
Net sales | $ 0 us-gaap_DisposalGroupIncludingDiscontinuedOperationRevenue | $ 459.2 us-gaap_DisposalGroupIncludingDiscontinuedOperationRevenue | $ 16.2 us-gaap_DisposalGroupIncludingDiscontinuedOperationRevenue | $ 1,443.6 us-gaap_DisposalGroupIncludingDiscontinuedOperationRevenue
Net gain on sale of businesses | 0 us-gaap_DiscontinuedOperationProvisionForLossGainOnDisposalBeforeIncomeTax | 0 us-gaap_DiscontinuedOperationProvisionForLossGainOnDisposalBeforeIncomeTax | 627.3 us-gaap_DiscontinuedOperationProvisionForLossGainOnDisposalBeforeIncomeTax | 32.1 us-gaap_DiscontinuedOperationProvisionForLossGainOnDisposalBeforeIncomeTax
Long-lived asset impairment charge | 0 cag_DisposalGroupIncludingDiscontinuedOperationImpairmentofLongLivedAssetstobeDisposedof | (25.4)cag_DisposalGroupIncludingDiscontinuedOperationImpairmentofLongLivedAssetstobeDisposedof | 0 cag_DisposalGroupIncludingDiscontinuedOperationImpairmentofLongLivedAssetstobeDisposedof | (25.4)cag_DisposalGroupIncludingDiscontinuedOperationImpairmentofLongLivedAssetstobeDisposedof
Income (loss) from operations of discontinued operations before income taxes and equity method investment earnings | 0.3 us-gaap_DisposalGroupIncludingDiscontinuedOperationOperatingIncomeLoss | 38.6 us-gaap_DisposalGroupIncludingDiscontinuedOperationOperatingIncomeLoss | (10.1)us-gaap_DisposalGroupIncludingDiscontinuedOperationOperatingIncomeLoss | 94.0 us-gaap_DisposalGroupIncludingDiscontinuedOperationOperatingIncomeLoss
Income before income taxes | 0.3 us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationBeforeIncomeTax | 13.2 us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationBeforeIncomeTax | 617.2 us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationBeforeIncomeTax | 100.7 us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationBeforeIncomeTax
Income tax expense | 0.9 us-gaap_DiscontinuedOperationTaxEffectOfDiscontinuedOperation | 2.5 us-gaap_DiscontinuedOperationTaxEffectOfDiscontinuedOperation | 255.2 us-gaap_DiscontinuedOperationTaxEffectOfDiscontinuedOperation | 34.3 us-gaap_DiscontinuedOperationTaxEffectOfDiscontinuedOperation
Equity method investment earnings | 0 cag_IncomeLossFromOngoingEquityMethodInvestmentInDiscontinuedOperationAfterDisposal | 0.1 cag_IncomeLossFromOngoingEquityMethodInvestmentInDiscontinuedOperationAfterDisposal | 0 cag_IncomeLossFromOngoingEquityMethodInvestmentInDiscontinuedOperationAfterDisposal | 0.2 cag_IncomeLossFromOngoingEquityMethodInvestmentInDiscontinuedOperationAfterDisposal
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

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- Definition Disposal Group, Including Discontinued Operation, Impairment of Long-Lived Assets to be Disposed of + References No definition available. + Details
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- Definition Amount of share in income (loss) of the equity method investee after the disposal of the discontinued operation. + References No definition available. + Details
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- Definition Overall income (loss) from a disposal group that is classified as a component of the entity, before income tax, reported as a separate component of income before extraordinary items. Includes the following (before income tax): income (loss) from operations during the phase-out period, gain (loss) on disposal, provision (or any reversals of earlier provisions) for loss on disposal, and adjustments of a prior period gain (loss) on disposal. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6360339&loc=d3e1361-107760 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6892542&loc=d3e957-107759 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04.12) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 13 -Article 7 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 05 -Paragraph 15 -Article 3 + Details
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- Definition Amount, before tax, of loss recognized for the write-down to fair value, less cost to sell, of a disposal group. Includes before tax gain for a subsequent increase in fair value (less cost to sell) up to the cumulative loss previously recognized through write-downs. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6892542&loc=d3e957-107759 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6360339&loc=d3e1361-107760 + Details
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- Definition Tax effect allocated to a disposal group that is classified as a component of the entity reported as a separate component of income before extraordinary items. Includes the tax effects of the following: income (loss) from operations during the phase-out period, gain (loss) on disposal, provision (or any reversals of earlier provisions) for loss on disposal, and adjustments of a prior period gain (loss) on disposal. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b),(c) -URI http://asc.fasb.org/extlink&oid=6360339&loc=d3e1361-107760 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32672-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 20 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=18498875&loc=d3e38679-109324 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6892542&loc=d3e957-107759 + Details
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- Definition Amount of operating income or loss attributable to the disposal group, including a component of the entity (discontinued operation), during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6360339&loc=d3e1361-107760 + Details
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- Definition Amount of sales or other form of revenues attributable to the disposal group, including a component of the entity (discontinued operation), during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6360339&loc=d3e1361-107760 + Details
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