Name:	kr_MultiemployerPlansCommitmentAndWithdrawalObligationBeforeTax
Namespace Prefix:	kr_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Amount of contribution to transition reserve in new variable annuity pension plan.

No definition available.

Name:	kr_MultiemployerPlansTransitionReserveContribution
Namespace Prefix:	kr_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Amount of withdrawal liability and contribution to transition reserve in new variable annuity pension plan.

No definition available.

Name:	kr_MultiemployerPlansWithdrawalLiabilityAndTransitionReserveContribution
Namespace Prefix:	kr_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Period of installment payments for the withdrawal liability to be satisfied.

No definition available.

Name:	kr_MultiemployerPlansWithdrawalLiabilityInstallmentPeriod
Namespace Prefix:	kr_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event.

No definition available.

Name:	us-gaap_SubsequentEventLineItems
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Name:	srt_StatementScenarioAxis=srt_ScenarioForecastMember
Namespace Prefix:
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Name:	us-gaap_RetirementPlanNameAxis=kr_UnitedFoodAndCommercialWorkersInternationalUnionUfcwConsolidatedPensionPlanMember
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