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

Represents the minimum age for retirement criteria for Automatic Retirement Contribution under employee stock purchase, saving, or similar plan (employee benefit plan (EBP)).

No definition available.

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

Represents the minimum age for termination criteria for Automatic Retirement Contribution under employee stock purchase, saving, or similar plan (employee benefit plan (EBP)).

No definition available.

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

Represents the minimum age for termination with respect to age plus service criteria for Automatic Retirement Contribution under employee stock purchase, saving, or similar plan (employee benefit plan (EBP)).

No definition available.

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

Represents the minimum service hours per year for the eligibility of Automatic Retirement Contribution under employee stock purchase, saving, or similar plan (employee benefit plan (EBP)).

No definition available.

Name:	kr_EmployeeBenefitPlanAutomaticRetirementContributionMinimumHoursOfService
Namespace Prefix:	kr_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

Percentage of compensation allocation for Automatic Retirement Contribution under employee stock purchase, saving, or similar plan (employee benefit plan (EBP)).

No definition available.

Name:	kr_EmployeeBenefitPlanAutomaticRetirementContributionPercentageOfContributionAllocation
Namespace Prefix:	kr_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

Represents the minimum age for retirement under employee stock purchase, saving, or similar plan (employee benefit plan (EBP)).

No definition available.

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

Represents the minimum service period for plan eligibility under employee stock purchase, saving, or similar plan (employee benefit plan (EBP)).

No definition available.

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

Threshold percentage of participant contributions permitted to be invested in employer stock under an employee stock purchase, savings, or similar plan (employee benefit plan (EBP)).

No definition available.

Name:	kr_EmployeeBenefitPlanThresholdPercentageOfEmployerStockInvestment
Namespace Prefix:	kr_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

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.

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 962
-SubTopic 205
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478416/962-205-50-1

Name:	us-gaap-ebp_EmployeeBenefitPlanDescriptionOfPlanLineItems
Namespace Prefix:	us-gaap-ebp_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

Percentage of participant compensation eligible for employer matching contribution for participant in employee stock purchase, saving, or similar plan (employee benefit plan (EBP)).

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 962
-SubTopic 325
-Name Accounting Standards Codification
-Section 55
-Paragraph 17
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478873/962-325-55-17

Name:	us-gaap-ebp_EmployeeBenefitPlanEmployerContributionParticipantCompensationMatchedPercentage
Namespace Prefix:	us-gaap-ebp_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

Percentage of maximum pretax annual compensation that participant in employee stock purchase, saving, or similar plan (employee benefit plan (EBP)), is permitted to contribute to total pretax annual compensation.