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DISCONTINUED OPERATIONS, OTHER ASSETS HELD FOR SALE, AND THE FORMATION OF ARDENT MILLS (Assets and Liabilities Classified as Held for Sale) (Parenthetical) (Details) (USD $) In Millions, unless otherwise specified | Nov. 23, 2014 | May 25, 2014
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Discontinued Operations and Disposal Groups [Abstract] |  |
Allowance for doubtful accounts | $ 0 cag_DisposalGroupIncludingDiscontinuedOperationAllowanceforDoubtfulAccountsReceivable | $ 1.2 cag_DisposalGroupIncludingDiscontinuedOperationAllowanceforDoubtfulAccountsReceivable

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

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- Details
Name: | us-gaap_DiscontinuedOperationsAndDisposalGroupsAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration