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ACQUISITIONS (Narrative) (Details) (USD $) In Millions, unless otherwise specified | 9 Months Ended | 1 Months Ended |
--- | --- | --- | ---
Feb. 22, 2015 | Feb. 23, 2014 | Jul. 31, 2014 | Sep. 30, 2013 | May 25, 2014
Business Acquisitions [Line Items] |  |  |  |  |
Payments to acquire business, net | $ 74.7 us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired | $ 39.9 us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired |  |  |
Purchase price allocated to goodwill | 6,305.0 us-gaap_Goodwill |  |  |  | 7,828.5 us-gaap_Goodwill
TaiMei Potato Industry Limited |  |  |  |  |
Business Acquisitions [Line Items] |  |  |  |  |
Payments to acquire business, gross |  |  | 91.8 us-gaap_PaymentsToAcquireBusinessesGross / us-gaap_BusinessAcquisitionAxis = cag_TaiMeiPotatoIndustryLimitedMember |  |
Payments to acquire business, net |  |  | 74.7 us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired / us-gaap_BusinessAcquisitionAxis = cag_TaiMeiPotatoIndustryLimitedMember |  |
Purchase price allocated to goodwill |  |  | 20.2 us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = cag_TaiMeiPotatoIndustryLimitedMember |  |
Purchase price allocated to other intangible assets |  |  | 3.3 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill / us-gaap_BusinessAcquisitionAxis = cag_TaiMeiPotatoIndustryLimitedMember |  |
Harlan Bakeries |  |  |  |  |
Business Acquisitions [Line Items] |  |  |  |  |
Payments to acquire business, gross |  |  |  | $ 39.9 us-gaap_PaymentsToAcquireBusinessesGross / us-gaap_BusinessAcquisitionAxis = cag_HarlanBakeriesMember |

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- Definition Amount of intangible assets, excluding goodwill, acquired at the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=39739317&loc=d3e4845-128472 + Details
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