Defined benefit plan benefit obligation payment for settlement and settlements of plan assets.

No definition available.

Name:	cag_DefinedBenefitPlanBenefitObligationPaymentForSettlementAndSettlementsOfPlanAssets
Namespace Prefix:	cag_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The amount of benefit obligation of defined benefit plan transferred to an insurance company through the purchase of an irrevocable group annuity contract.

+ References

No definition available.

+ Details

Name:	cag_DefinedBenefitPlanBenefitObligationTransferThroughGroupAnnuityContractAmount
Namespace Prefix:	cag_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The number of retired participants of benefit obligation of defined benefit plan transferred to an insurance company through the purchase of an irrevocable group annuity contract.

+ References

No definition available.

+ Details

Name:	cag_DefinedBenefitPlanBenefitObligationTransferThroughGroupAnnuityContractNumberOfRetiredParticipants
Namespace Prefix:	cag_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

The amount of increase in in plan assets of defined benefit plan transferred from an insurance company through the purchase of an irrevocable group annuity contract.

+ References

No definition available.

+ Details

Name:	cag_DefinedBenefitPlanPlanAssetsTransferFromGroupAnnuityContractAmount
Namespace Prefix:	cag_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Represents net actuarial gain (loss) for defined benefit plan recognized.

+ References

No definition available.

+ Details

Name:	cag_DefinedBenefitPlanRecognizedNetActuarialGainLoss
Namespace Prefix:	cag_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Represents percentage of defined benefit plan recognized net actuarial gain (loss).

+ References

No definition available.

+ Details

Name:	cag_DefinedBenefitPlanRecognizedNetActuarialGainLossPercentage
Namespace Prefix:	cag_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Represents fair value investment ability to impose customary redemption gates.

+ References

No definition available.

+ Details

Name:	cag_FairValueInvestmentsAbilityToImposeCustomaryRedemptionGates
Namespace Prefix:	cag_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Represents fair value investments impose customary redemption gates.

+ References

No definition available.

+ Details

Name:	cag_FairValueInvestmentsImposeCustomaryRedemptionGates
Namespace Prefix:	cag_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Represents percentage of green zero multiemployer plan funded.

+ References

No definition available.

+ Details

Name:	cag_GreenZoneMultiemployerPlanFundedPercentage
Namespace Prefix:	cag_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Represents providing more than contribution.

+ References

No definition available.

+ Details

Name:	cag_PercentageProvidingMoreThanPlansContribution
Namespace Prefix:	cag_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Represents red zone multiemployer plans funded.

+ References

No definition available.

+ Details

Name:	cag_RedZoneMultiemployerPlansFundedPercentage
Namespace Prefix:	cag_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Represents unfunded commitment for additional investment.

+ References

No definition available.

+ Details

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

- Definition

Represents yellow zero multiemployer plans funded.

+ References

No definition available.

+ Details

Name:	cag_YellowZoneMultiemployerPlansFundedPercentage
Namespace Prefix:	cag_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Amount of actuarial present value of benefits attributed to employee service rendered, excluding assumptions about future compensation level.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 715
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (e)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480506/715-20-50-1

+ Details

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

- Definition

Amount of gain (loss) from change in actuarial assumptions which (increases) decreases benefit obligation of defined benefit plan. Assumptions include, but are not limited to, interest, mortality, employee turnover, salary, and temporary deviation from substantive plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 715
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (a)(4)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480506/715-20-50-1

+ Details

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

- Definition

Weighted average rate for present value of future retirement benefits cash flows, used to determine benefit obligation of defined benefit plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 715
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (k)(1)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480506/715-20-50-1

+ Details

Name:	us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRate
Namespace Prefix:	us-gaap_
Data Type:	dtr-types: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_DefinedBenefitPlanDisclosureLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of contribution expected to be received by defined benefit plan from employer in next fiscal year following current fiscal year.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 715
-SubTopic 20
-Name Accounting Standards Codification
-Section 55
-Paragraph 18
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480482/715-20-55-18

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 715
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (g)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480506/715-20-50-1

+ Details

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

- Definition

Percentage of target investment allocation to total plan assets. Includes, but is not limited to, percentage on weighted-average basis if more than one plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 715
-SubTopic 20
-Name Accounting Standards Codification
-Section 55
-Paragraph 17
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480482/715-20-55-17

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 715
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (d)(i)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480506/715-20-50-1

+ Details

Name:	us-gaap_DefinedBenefitPlanPlanAssetsTargetAllocationPercentage
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Amount of cost for defined contribution plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 715
-SubTopic 70
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480794/715-70-50-1

+ Details

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

- Definition

Amount, after tax, of gain (loss) for (increase) decrease in value of benefit obligation for change in actuarial assumptions and increase (decrease) in value of plan assets from experience different from that assumed of defined benefit plan, that has not been recognized in net periodic benefit (cost) credit.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 220
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 11
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482790/220-10-45-11

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 220
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 10A
-Subparagraph (i)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482790/220-10-45-10A

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 715
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (i)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480506/715-20-50-1

+ Details

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

- Definition

Amount, before tax, of increase (decrease) to other comprehensive income from settlement and curtailment gain (loss) of defined benefit plan.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Section 45
-Paragraph 15
-SubTopic 10
-Topic 220
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482790/220-10-45-15

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 220
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 11
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482790/220-10-45-11

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 715
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (i)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480506/715-20-50-1

+ Details

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

- Details

Name:	srt_RangeAxis=srt_MaximumMember
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_DefinedBenefitPlanByPlanAssetCategoriesAxis=us-gaap_PrivateEquityFundsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=cag_NaturalResourcesFundsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=us-gaap_FixedIncomeSecuritiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=us-gaap_DefinedBenefitPlanEquitySecuritiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RetirementPlanTypeAxis=us-gaap_PensionPlansDefinedBenefitMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RetirementPlanTypeAxis=us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

PENSION AND POSTRETIREMENT BENEFITS (Details) $ in Millions	3 Months Ended		12 Months Ended
PENSION AND POSTRETIREMENT BENEFITS (Details) $ in Millions	May 25, 2025 USD ($)	Feb. 25, 2024 USD ($)	May 25, 2025 USD ($) item	May 26, 2024 USD ($)	May 28, 2023 USD ($)	Dec. 31, 2023	Dec. 30, 2023
PENSION AND POSTRETIREMENT BENEFITS
Noncash pre-tax settlement gain		$ 6.8
Defined Benefit Plan, Recognized Net Actuarial Gain (Loss), Percentage			10.00%
Fair Value Investments Ability To Impose Customary Redemption Gates	$ 21.3		$ 21.3
Fair Value Investments Impose Customary Redemption Gates	$ 0.0		$ 0.0
Percentage Providing More Than Plans Contribution			5.00%
Defined Contribution Plan, Cost			$ 66.7	$ 62.3	$ 59.4
Maximum [Member]
PENSION AND POSTRETIREMENT BENEFITS
Red Zone Multiemployer Plans Funded Percentage			65.00%
Yellow Zone Multiemployer Plans Funded Percentage	80.00%		80.00%
Minimum [Member]
PENSION AND POSTRETIREMENT BENEFITS
Green Zone Multiemployer Plan Funded Percentage	80.00%		80.00%
Private Equity Funds [Member]
PENSION AND POSTRETIREMENT BENEFITS
Unfunded Commitment For Additional Investment	$ 32.2		$ 32.2
Natural Resources Funds [Member]
PENSION AND POSTRETIREMENT BENEFITS
Unfunded Commitment For Additional Investment	$ 6.4		$ 6.4
Fixed Income Securities [Member]
PENSION AND POSTRETIREMENT BENEFITS
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage	90.00%		90.00%
Defined Benefit Plan, Equity Securities [Member]
PENSION AND POSTRETIREMENT BENEFITS
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage	10.00%		10.00%
Pension plan
PENSION AND POSTRETIREMENT BENEFITS
Defined benefit plan benefit obligation transfer amount			$ 760.6
Number of retired participants \| item			22,000
Amount of increase in in plan assets			$ 678.3
Actuarial gain			82.3
Noncash pre-tax settlement gain	$ 13.0		$ (13.0)	$ 1.1
Defined benefit plan, settlement, payment and plan of assets		$ 135.0
Discount rate	5.91%		5.91%	5.58%		5.20%	5.52%
Contributions, next fiscal year	$ 11.0		$ 11.0
Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss)			148.6	$ 31.2
Defined Benefit Plan, Accumulated Benefit Obligation	$ 1,690.0		1,690.0	2,570.0
Defined Benefit Plan Recognized Net Actuarial Gain Loss			$ 3.5	$ 12.5	$ 0.1
Other postretirement benefits plan
PENSION AND POSTRETIREMENT BENEFITS
Discount rate	5.43%		5.43%	5.41%
Contributions, next fiscal year	$ 6.6		$ 6.6
Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss)			$ (4.4)	$ 0.8