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VARIABLE INTEREST ENTITIES (Narrative) (Details) (USD $) In Millions, unless otherwise specified | 6 Months Ended |
--- | --- | ---
Nov. 23, 2014 | May 25, 2014
Variable Interest Entity [Line Items] |  |
Price at which Ochoa has the right to put its equity interest | $ 43.4 cag_VariableInterestEntityPriceOfEquityInterest |
Balance of promissory note due from joint venture | 36.1 cag_BalanceOfPromissoryNoteDueFromJointVenture |
Long-term debt interest rate | 3.25%us-gaap_DebtInstrumentInterestRateStatedPercentage |
Line of credit with Lamb Weston BSW, Maximum Borrowing Capacity | 15.0 cag_VariableInterestEntityLendingUnderLineOfCredit |
Lamb Weston BSW |  |
Variable Interest Entity [Line Items] |  |
Acquisition of equity interest in Lamb Weston | 49.99%us-gaap_VariableInterestEntityOwnershipPercentage / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = cag_LambWestonBswMember |
Lamb Weston RDO |  |
Variable Interest Entity [Line Items] |  |
Acquisition of equity interest in Lamb Weston | 50.00%us-gaap_VariableInterestEntityOwnershipPercentage / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = cag_LambWestonRdoMember |
Investment in Lamb Weston, maximum exposure | 13.5 us-gaap_VariableInterestEntityEntityMaximumLossExposureAmount / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = cag_LambWestonRdoMember | 12.6 us-gaap_VariableInterestEntityEntityMaximumLossExposureAmount / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = cag_LambWestonRdoMember
Owners' equity in capital structure of variable interest entity | 27.1 cag_OwnersEquityInCapitalStructureOfVariableInterestEntity / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = cag_LambWestonRdoMember |
Term borrowings from banks in capital structure of Lamb Weston, RDO | $ 42.2 cag_TermBorrowingsFromBanksInCapitalStructureOfVariableInterestEntity / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = cag_LambWestonRdoMember |
LIBOR |  |
Variable Interest Entity [Line Items] |  |
Libor Plus | 2.00%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_VariableRateAxis = us-gaap_LondonInterbankOfferedRateLIBORMember |

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- Definition Balance of promissory note due from joint venture. + References No definition available. + Details
Name: | cag_BalanceOfPromissoryNoteDueFromJointVenture
Namespace Prefix: | cag_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Owners' equity in capital structure of variable interest entity. + References No definition available. + Details
Name: | cag_OwnersEquityInCapitalStructureOfVariableInterestEntity
Namespace Prefix: | cag_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Term borrowings from banks in capital structure of variable interest entity. + References No definition available. + Details
Name: | cag_TermBorrowingsFromBanksInCapitalStructureOfVariableInterestEntity
Namespace Prefix: | cag_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Variable interest entity lending under line of credit. + References No definition available. + Details
Name: | cag_VariableInterestEntityLendingUnderLineOfCredit
Namespace Prefix: | cag_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Variable interest entity price of equity interest. + References No definition available. + Details
Name: | cag_VariableInterestEntityPriceOfEquityInterest
Namespace Prefix: | cag_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Percentage points added to the reference rate to compute the variable rate on the debt instrument. + References No definition available. + Details
Name: | us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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- Definition The reporting entity's maximum amount of exposure to loss as a result of its involvement with the Variable Interest Entity (VIE). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph b -URI http://asc.fasb.org/extlink&oid=28200181&loc=d3e5728-111685 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=28200181&loc=d3e5747-111685 + Details
Name: | us-gaap_VariableInterestEntityEntityMaximumLossExposureAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Details
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Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Percentage of the Variable Interest Entity's (VIE) voting interest owned by (or beneficial interest in) the reporting entity (directly or indirectly). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 5A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=28200181&loc=SL6759159-111685 + Details
Name: | us-gaap_VariableInterestEntityOwnershipPercentage
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis=cag_LambWestonBswMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis=cag_LambWestonRdoMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_VariableRateAxis=us-gaap_LondonInterbankOfferedRateLIBORMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |