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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 | Feb. 28, 2016 | May. 31, 2015
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Discontinued operations, held-for-sale |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |
Allowance for doubtful accounts | $ 0.0 | $ 0.5

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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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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_DisposalGroupClassificationAxis=us-gaap_DiscontinuedOperationsHeldforsaleMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |