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Note 14 - Leases (Details Textual) - USD ($) $ in Millions | 12 Months Ended
--- | ---
May 29, 2022 | May 30, 2021 | May 31, 2020
Operating Cost, Accelerated Amount |  |  | $ 9.9
Operating Lease, Impairment Loss |  | $ 2.9 | $ 2.9
Warehouse Facility [Member] |  |  |
Lessee, Lease Payment Not Yet Commenced | $ 270.6 |  |
Future Minimum Lease Commitment. | $ 254.3 |  |
Lessee, Term of Contract (Year) | 20 years |  |

X
- Definition Represents future minimum lease commitment. + References No definition available. + Details
Name: | cag_FutureMinimumLeaseCommitment
Namespace Prefix: | cag_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Lessee, lease payment not yet commenced. + References No definition available. + Details
Name: | cag_LesseeLeasePaymentNotYetCommenced
Namespace Prefix: | cag_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Term of lessee's lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References No definition available. + Details
Name: | cag_LesseeTermOfContract
Namespace Prefix: | cag_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Accelerated amount of operating cost. + References No definition available. + Details
Name: | cag_OperatingCostAcceleratedAmount
Namespace Prefix: | cag_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of loss from impairment of right-of-use asset from operating lease. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 25 -Paragraph 6 -Subparagraph (c) -URI https://asc.fasb.org/extlink&oid=123399704&loc=SL77918431-209957 + Details
Name: | us-gaap_OperatingLeaseImpairmentLoss
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Details
Name: | us-gaap_LeaseContractualTermAxis=cag_WarehouseFacilityMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |