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DISCONTINUED OPERATIONS AND THE FORMATION OF ARDENT MILLS (Assets and Liabilities Classified as Held for Sale) (Additional Information) (Details) - USD ($) $ in Millions | Aug. 30, 2015 | May. 31, 2015
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Discontinued Operations and Disposal Groups [Abstract] |  |
Allowance for doubtful accounts | $ 0.4 | $ 0.5

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- Definition Disposal Group, Including Discontinued Operation, Allowance for Doubtful Accounts Receivable + References No definition available. + Details
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Namespace Prefix: | cag_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- References No definition available. + Details
Name: | us-gaap_DiscontinuedOperationsAndDisposalGroupsAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration