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LONG-TERM DEBT (Narrative) (Details) (USD $) | 3 Months Ended | 6 Months Ended | 3 Months Ended
--- | --- | --- | ---
Nov. 23, 2014 | Aug. 24, 2014 | Nov. 23, 2014 | Nov. 24, 2013 | Nov. 24, 2013 | Nov. 27, 2010
Debt Instrument [Line Items] |  |  |  |  |  |
Repayments of Long-term Debt |  |  | $ 1,489,400,000 us-gaap_RepaymentsOfLongTermDebt | $ 50,700,000 us-gaap_RepaymentsOfLongTermDebt |  |
Debt Instrument, Interest Rate, Stated Percentage | 3.25%us-gaap_DebtInstrumentInterestRateStatedPercentage |  | 3.25%us-gaap_DebtInstrumentInterestRateStatedPercentage |  |  |
Reduction of net interest expense due to impact of interest rate swap contracts | 300,000 cag_ReductionOfNetInterestExpenseDueToImpactOfInterestRateSwapContracts |  | 600,000 cag_ReductionOfNetInterestExpenseDueToImpactOfInterestRateSwapContracts |  |  |
Gains (Losses) on Extinguishment of Debt |  | (16,300,000)us-gaap_GainsLossesOnExtinguishmentOfDebt |  |  |  |
2010 Interest Rate Swap |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Reduction of net interest expense due to impact of interest rate swap contracts |  |  |  | 4,700,000 cag_ReductionOfNetInterestExpenseDueToImpactOfInterestRateSwapContracts / us-gaap_DerivativeInstrumentRiskAxis = cag_A2010InterestRateSwapMember | 2,400,000 cag_ReductionOfNetInterestExpenseDueToImpactOfInterestRateSwapContracts / us-gaap_DerivativeInstrumentRiskAxis = cag_A2010InterestRateSwapMember |
Proceeds from termination of interest rate swap contract |  |  |  |  |  | 28,200,000 cag_ProceedsFromTerminationOfInterestRateSwapContract / us-gaap_DerivativeInstrumentRiskAxis = cag_A2010InterestRateSwapMember
2014 Interest Rate Swap |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Reduction of net interest expense due to impact of interest rate swap contracts | 2,600,000 cag_ReductionOfNetInterestExpenseDueToImpactOfInterestRateSwapContracts / us-gaap_DerivativeInstrumentRiskAxis = cag_A2014InterestRateSwapMember |  | 5,200,000 cag_ReductionOfNetInterestExpenseDueToImpactOfInterestRateSwapContracts / us-gaap_DerivativeInstrumentRiskAxis = cag_A2014InterestRateSwapMember |  |  |
Floating Rate Notes 0.37% |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Other Notes Payable |  | 550,000,000 us-gaap_NotesPayable / us-gaap_DebtInstrumentAxis = cag_FloatingRateNotesPointThirtySevenPercentMember |  |  |  |
Senior Notes | 2023 Maturity |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Repayments of Long-term Debt |  | 225,000,000 us-gaap_RepaymentsOfLongTermDebt / us-gaap_DebtInstrumentAxis = cag_A2023MaturityMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |  |  |  |
Senior Notes | 2043 Maturity |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Repayments of Long-term Debt | 43,000,000 us-gaap_RepaymentsOfLongTermDebt / us-gaap_DebtInstrumentAxis = cag_A2043MaturityMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember | 200,000,000 us-gaap_RepaymentsOfLongTermDebt / us-gaap_DebtInstrumentAxis = cag_A2043MaturityMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 4.65%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = cag_A2043MaturityMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |  | 4.65%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = cag_A2043MaturityMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |  |  |
Gains (Losses) on Extinguishment of Debt | 2,400,000 us-gaap_GainsLossesOnExtinguishmentOfDebt / us-gaap_DebtInstrumentAxis = cag_A2043MaturityMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |  |  |  |  |
Senior Notes | 2019 Maturity |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Repayments of Long-term Debt |  | 25,000,000 us-gaap_RepaymentsOfLongTermDebt / us-gaap_DebtInstrumentAxis = cag_A2019MaturityMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |  |  |  |
Senior Notes | 2018 Maturity |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Repayments of Long-term Debt |  | 25,000,000 us-gaap_RepaymentsOfLongTermDebt / us-gaap_DebtInstrumentAxis = cag_A2018MaturityMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |  |  |  |
Senior Notes | 2017 Maturity |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Repayments of Long-term Debt |  | 25,000,000 us-gaap_RepaymentsOfLongTermDebt / us-gaap_DebtInstrumentAxis = cag_A2017MaturityMember / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |  |  |  |
LIBOR plus 1.75% term loans |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Repayments of Long-term Debt |  | 900,000,000 us-gaap_RepaymentsOfLongTermDebt / us-gaap_LongtermDebtTypeAxis = cag_DebtInstrumentBasisSpreadOnVariableRateMember |  |  |  |
Gains (Losses) on Extinguishment of Debt |  | (8,300,000)us-gaap_GainsLossesOnExtinguishmentOfDebt / us-gaap_LongtermDebtTypeAxis = cag_DebtInstrumentBasisSpreadOnVariableRateMember |  |  |  |
Tender Premium |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Gains (Losses) on Extinguishment of Debt |  | $ 9,500,000 us-gaap_GainsLossesOnExtinguishmentOfDebt / us-gaap_ExtinguishmentOfDebtAxis = cag_TenderPremiumMember |  |  |  |
LIBOR | Floating Rate Notes 0.37% |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Floating rate notes percentage rate |  | 0.37%us-gaap_LongTermDebtPercentageBearingVariableInterestRate / us-gaap_DebtInstrumentAxis = cag_FloatingRateNotesPointThirtySevenPercentMember / us-gaap_VariableRateAxis = us-gaap_LondonInterbankOfferedRateLIBORMember |  |  |  |
LIBOR | LIBOR plus 1.75% term loans |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  | 1.75%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_LongtermDebtTypeAxis = cag_DebtInstrumentBasisSpreadOnVariableRateMember / us-gaap_VariableRateAxis = us-gaap_LondonInterbankOfferedRateLIBORMember |  |  |  |

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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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- Definition Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 50 -Section 40 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6850294&loc=d3e12317-112629 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 50 -Section 40 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6850294&loc=d3e12355-112629 + Details
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