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GOODWILL AND OTHER IDENTIFIABLE INTANGIBLE ASSETS (Change in Carrying Amount of Goodwill) (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 9 Months Ended
--- | --- | ---
Feb. 22, 2015 | Feb. 22, 2015
Goodwill [Line Items] |  |
Balance as of |  | $ 7,828.5 us-gaap_Goodwill
Impairment | (1,290.0)us-gaap_GoodwillImpairmentLoss | (1,502.1)us-gaap_GoodwillImpairmentLoss
Acquisitions |  | 20.3 us-gaap_GoodwillAcquiredDuringPeriod
Currency translation adjustments |  | (41.7)us-gaap_GoodwillTranslationAndPurchaseAccountingAdjustments
Balance as of | 6,305.0 us-gaap_Goodwill | 6,305.0 us-gaap_Goodwill
Consumer Foods |  |
Goodwill [Line Items] |  |
Balance as of |  | 3,748.5 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = cag_ConsumerFoodsMember
Impairment |  | 0 us-gaap_GoodwillImpairmentLoss / us-gaap_StatementBusinessSegmentsAxis = cag_ConsumerFoodsMember
Acquisitions |  | 0 us-gaap_GoodwillAcquiredDuringPeriod / us-gaap_StatementBusinessSegmentsAxis = cag_ConsumerFoodsMember
Currency translation adjustments |  | (23.5)us-gaap_GoodwillTranslationAndPurchaseAccountingAdjustments / us-gaap_StatementBusinessSegmentsAxis = cag_ConsumerFoodsMember
Balance as of | 3,725.0 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = cag_ConsumerFoodsMember | 3,725.0 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = cag_ConsumerFoodsMember
Commercial Foods |  |
Goodwill [Line Items] |  |
Balance as of |  | 865.4 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = cag_CommercialFoodsMember
Impairment |  | 0 us-gaap_GoodwillImpairmentLoss / us-gaap_StatementBusinessSegmentsAxis = cag_CommercialFoodsMember
Acquisitions |  | 20.3 us-gaap_GoodwillAcquiredDuringPeriod / us-gaap_StatementBusinessSegmentsAxis = cag_CommercialFoodsMember
Currency translation adjustments |  | (1.5)us-gaap_GoodwillTranslationAndPurchaseAccountingAdjustments / us-gaap_StatementBusinessSegmentsAxis = cag_CommercialFoodsMember
Balance as of | 884.2 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = cag_CommercialFoodsMember | 884.2 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = cag_CommercialFoodsMember
Private Brands |  |
Goodwill [Line Items] |  |
Balance as of |  | 3,214.6 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = cag_PrivateBrandsMember
Impairment | (1,290.0)us-gaap_GoodwillImpairmentLoss / us-gaap_StatementBusinessSegmentsAxis = cag_PrivateBrandsMember | (1,502.1)us-gaap_GoodwillImpairmentLoss / us-gaap_StatementBusinessSegmentsAxis = cag_PrivateBrandsMember
Acquisitions |  | 0 us-gaap_GoodwillAcquiredDuringPeriod / us-gaap_StatementBusinessSegmentsAxis = cag_PrivateBrandsMember
Currency translation adjustments |  | (16.7)us-gaap_GoodwillTranslationAndPurchaseAccountingAdjustments / us-gaap_StatementBusinessSegmentsAxis = cag_PrivateBrandsMember
Balance as of | $ 1,695.8 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = cag_PrivateBrandsMember | $ 1,695.8 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = cag_PrivateBrandsMember

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- Definition Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266 + Details
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- Definition Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 + Details
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- Definition Amount of loss from the write-down of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13854-109267 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13777-109266 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 + Details
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- Details
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- Definition Amount of increase (decrease) from foreign currency translation adjustments and purchase accounting adjustments of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 + Details
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