Debt instrument accrued interest.

No definition available.

Name:	cag_DebtInstrumentAccruedInterest
Namespace Prefix:	cag_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Debt Instrument, Covenants, Funded Debt to EBITDA

+ References

No definition available.

+ Details

Name:	cag_DebtInstrumentCovenantsFundedDebtToEBITDA
Namespace Prefix:	cag_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Debt Instrument, Required Minimum Ratio of Earnings Before Interest, Taxes, Depreciation and Amortization to Interest Expense

+ References

No definition available.

+ Details

Name:	cag_DebtInstrumentRequiredMinimumRatioOfEarningsBeforeInterestTaxesDepreciationAndAmortizationToInterestExpense
Namespace Prefix:	cag_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Debt Instrument, Term, Extension Period

+ References

No definition available.

+ Details

Name:	cag_DebtInstrumentTermExtensionPeriod
Namespace Prefix:	cag_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Line Of Credit Facility, Maximum Borrowing Capacity After Increase With Consent Of Lenders

+ References

No definition available.

+ Details

Name:	cag_LineOfCreditFacilityMaximumBorrowingCapacityAfterIncreaseWithConsentOfLenders
Namespace Prefix:	cag_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of amortization expense attributable to debt issuance costs.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03(8))
-URI http://asc.fasb.org/extlink&oid=115205541&loc=SL114868664-224227

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=114775744&loc=d3e28555-108399

+ Details

Name:	us-gaap_AmortizationOfFinancingCosts
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- 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

- Definition

Face (par) amount of debt instrument at time of issuance.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=114775744&loc=d3e28551-108399

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 55
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=114775985&loc=d3e28878-108400

+ Details

Name:	us-gaap_DebtInstrumentFaceAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

+ Details

Name:	us-gaap_DebtInstrumentInterestRateStatedPercentage
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- 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_DebtInstrumentLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentTerm
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount, before accumulated amortization, of debt issuance costs related to line of credit arrangements. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section S45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=68176171&loc=SL68176184-208336

+ Details

Name:	us-gaap_DebtIssuanceCostsLineOfCreditArrangementsGross
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

The difference between the book value and the sale price of options, swaps, futures, forward contracts, and other derivative instruments. This element refers to the gain (loss) included in earnings.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 220
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-04.13(h))
-URI http://asc.fasb.org/extlink&oid=114873765&loc=SL114874048-224260

+ Details

Name:	us-gaap_GainLossOnSaleOfDerivatives
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(22))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(16))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(16))
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

+ Details

Name:	us-gaap_LineOfCredit
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

+ Details

Name:	us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
-Paragraph 4
-Subparagraph (b)(3)
-URI http://asc.fasb.org/extlink&oid=109500613&loc=SL6031897-161870

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(16))
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(16))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(22))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

Name:	us-gaap_LongTermDebt
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount, before tax, of reclassification of gain (loss) from accumulated other comprehensive income (AOCI) for derivative instrument designated and qualifying as cash flow hedge included in assessment of hedge effectiveness.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 15
-URI http://asc.fasb.org/extlink&oid=114867106&loc=d3e689-108580

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 11
-URI http://asc.fasb.org/extlink&oid=114867106&loc=d3e637-108580

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4C
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5624171-113959

+ Details

Name:	us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationBeforeTax
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The cash inflow during the period from additional borrowings in aggregate debt. Includes proceeds from short-term and long-term debt.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 14
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3255-108585

+ Details

Name:	us-gaap_ProceedsFromIssuanceOfDebt
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 15
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3291-108585

+ Details

Name:	us-gaap_RepaymentsOfLongTermDebt
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Details

Name:	us-gaap_StatementScenarioAxis=us-gaap_ScenarioForecastMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DerivativeInstrumentRiskAxis=us-gaap_InterestRateSwapMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=cag_ThreeYearTermLoansMaturingOnOctober262021Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=cag_FiveYearTermLoansMaturingOnOctober262023Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=cag_TermLoanCreditAgreementMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_IncomeStatementLocationAxis=us-gaap_InterestExpenseMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LongtermDebtTypeAxis=us-gaap_BridgeLoanMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LongtermDebtTypeAxis=us-gaap_SeniorNotesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=cag_NewSeniorUnsecuredNotesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=cag_FloatingRateSeniorNotesDueOctober222020Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=cag_A38SeniorNotesDueOctober222021Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=cag_A43SeniorNotesDueMay12024Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=cag_A46SeniorNotesDueNovember12025Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=cag_A485SeniorNotesDueNovember12028Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=cag_A53SeniorNotesDueNovember12038Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=cag_A54SeniorNotesDueNovember12048Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LongtermDebtTypeAxis=us-gaap_UnsecuredDebtMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_VariableRateAxis=us-gaap_BaseRateMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_VariableRateAxis=cag_OneMonthLondonInterbankOfferedRateMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_RangeAxis=srt_MinimumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

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

- Details

Name:	srt_RangeAxis=srt_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_CreditFacilityAxis=us-gaap_RevolvingCreditFacilityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

LONG-TERM DEBT AND REVOLVING CREDIT FACILITY - Narrative (Details) - USD ($)	3 Months Ended
	Aug. 25, 2019	Nov. 25, 2018	Aug. 26, 2018	Nov. 27, 2022	May 26, 2019
Debt Instrument [Line Items]
Repayments of long-term debt	$ 205,800,000		$ 0
Remaining balance of debt	10,470,000,000				$ 10,680,000,000
Impact of interest rate swap contracts designated as cash flow hedges	$ 800,000		0
Required minimum ratio of EBITDA to interest expense	3.00%
Ratio of funded debt to EBITDA (maximum)	5.875%
Accrued interest	$ 146,900,000				$ 61,300,000
Scenario, Forecast
Debt Instrument [Line Items]
Ratio of funded debt to EBITDA (maximum)				3.75%
Interest Rate Swap
Debt Instrument [Line Items]
Proceeds from settlement of interest rate swaps		$ 47,500,000
Three-year Term Loans Maturing on October 26, 2021
Debt Instrument [Line Items]
Repayments of long-term debt	100,000,000.0
Remaining balance of debt	100,000,000.0
Five-year Term Loans Maturing on October 26, 2023
Debt Instrument [Line Items]
Repayments of long-term debt	100,000,000.0
Remaining balance of debt	100,000,000.0
Term Loan
Debt Instrument [Line Items]
Aggregate principal amount		1,300,000,000
Repayments of long-term debt	200,000,000.0
Remaining balance of debt	200,000,000.0
Interest Expense
Debt Instrument [Line Items]
Impact of interest rate swap contracts designated as cash flow hedges	900,000
Bridge Financing
Debt Instrument [Line Items]
Maximum borrowing capacity			9,000,000,000.0
Costs incurred in connection with bridge financing			45,700,000
Bridge Financing \| Interest Expense
Debt Instrument [Line Items]
Net interest expense resulting from amortization of incurred costs			$ 5,600,000
Senior Notes \| New Senior Unsecured Notes
Debt Instrument [Line Items]
Aggregate principal amount		7,025,000,000.000
Senior Notes \| Floating Rate Senior Notes due October 22, 2020
Debt Instrument [Line Items]
Aggregate principal amount		$ 525,000,000.0
Basis spread on variable interest rate		0.75%
Senior Notes \| 3.8% Senior Notes due October 22, 2021
Debt Instrument [Line Items]
Aggregate principal amount		$ 1,200,000,000
Stated interest rate		3.80%
Senior Notes \| 4.3% Senior Notes due May 1, 2024
Debt Instrument [Line Items]
Aggregate principal amount		$ 1,000,000,000.0
Stated interest rate		4.30%
Senior Notes \| 4.6% Senior Notes due November 1, 2025
Debt Instrument [Line Items]
Aggregate principal amount		$ 1,000,000,000.0
Stated interest rate		4.60%
Senior Notes \| 4.85% Senior Notes due November 1, 2028
Debt Instrument [Line Items]
Aggregate principal amount		$ 1,300,000,000
Stated interest rate		4.85%
Senior Notes \| 5.3% Senior Notes due November 1, 2038
Debt Instrument [Line Items]
Aggregate principal amount		$ 1,000,000,000.0
Stated interest rate		5.30%
Senior Notes \| 5.4% Senior Notes due November 1, 2048
Debt Instrument [Line Items]
Aggregate principal amount		$ 1,000,000,000.0
Stated interest rate		5.40%
Unsecured Debt \| Three-year Term Loans Maturing on October 26, 2021
Debt Instrument [Line Items]
Proceeds from new Term Loan Facility		$ 650,000,000.0
Debt Instrument, Term		3 years
Unsecured Debt \| Five-year Term Loans Maturing on October 26, 2023
Debt Instrument [Line Items]
Proceeds from new Term Loan Facility		$ 650,000,000.0
Debt Instrument, Term		5 years
Unsecured Debt \| Term Loan
Debt Instrument [Line Items]
Proceeds from new Term Loan Facility		$ 1,300,000,000
Unsecured Debt \| Term Loan \| Base rate
Debt Instrument [Line Items]
Basis spread on variable interest rate		0.50%
Unsecured Debt \| Term Loan \| One-month LIBOR
Debt Instrument [Line Items]
Basis spread on variable interest rate		1.00%
Minimum \| Unsecured Debt \| Three-year Term Loans Maturing on October 26, 2021 \| London Interbank Offered Rate (LIBOR)
Debt Instrument [Line Items]
Basis spread on variable interest rate		1.00%
Minimum \| Unsecured Debt \| Three-year Term Loans Maturing on October 26, 2021 \| One-month LIBOR
Debt Instrument [Line Items]
Basis spread on variable interest rate		0.00%
Minimum \| Unsecured Debt \| Five-year Term Loans Maturing on October 26, 2023 \| London Interbank Offered Rate (LIBOR)
Debt Instrument [Line Items]
Basis spread on variable interest rate		1.125%
Minimum \| Unsecured Debt \| Five-year Term Loans Maturing on October 26, 2023 \| One-month LIBOR
Debt Instrument [Line Items]
Basis spread on variable interest rate		0.125%
Maximum \| Unsecured Debt \| Three-year Term Loans Maturing on October 26, 2021 \| London Interbank Offered Rate (LIBOR)
Debt Instrument [Line Items]
Basis spread on variable interest rate		1.625%
Maximum \| Unsecured Debt \| Three-year Term Loans Maturing on October 26, 2021 \| One-month LIBOR
Debt Instrument [Line Items]
Basis spread on variable interest rate		0.625%
Maximum \| Unsecured Debt \| Five-year Term Loans Maturing on October 26, 2023 \| London Interbank Offered Rate (LIBOR)
Debt Instrument [Line Items]
Basis spread on variable interest rate		1.75%
Maximum \| Unsecured Debt \| Five-year Term Loans Maturing on October 26, 2023 \| One-month LIBOR
Debt Instrument [Line Items]
Basis spread on variable interest rate		0.75%
The Facility
Debt Instrument [Line Items]
Maximum borrowing capacity	1,600,000,000
Maximum additional borrowing capacity	2,100,000,000
Outstanding borrowings under revolving credit facility	$ 0
The Facility \| Minimum
Debt Instrument [Line Items]
Duration of additional extension terms available for credit facility	1 year
The Facility \| Maximum
Debt Instrument [Line Items]
Duration of additional extension terms available for credit facility	2 years