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

Amount of contributions accrued in period for multiemployer plans by the employer. A multiemployer plan is a pension or postretirement benefit plan to which two or more unrelated employers contribute where assets contributed by one participating employer may be used to provide benefits to employees of other participating employers.

No definition available.

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

Amount of contributions made to multiemployer plans by the employer due to commitments and withdrawal liabilities.

No definition available.

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

Represents the after-tax charge of commitments and withdrawal liabilities associated with the restructuring of pension plan agreements.

No definition available.

Name:	kr_MultiemployerPlansCommitmentAndWithdrawalObligation
Namespace Prefix:	kr_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

The amount of the before-tax charge of commitments and withdrawal liabilities associated with the restructuring of pension plan agreements.

No definition available.

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

Represents the minimum percentage that the Company contributed to the pension fund, as a percentage of the total amount contributed by all employers participating in the plan.

No definition available.

Name:	kr_MultiemployerPlansMinimumPercentageOfContributionsOfTotalContributionsReceivedByPensionFund
Namespace Prefix:	kr_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

Represents the total number of most significant collective bargaining agreements for the entity related to this pension fund.

No definition available.

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

Represents percentage of funded status.

No definition available.

Name:	kr_MultiemployerPlansPercentageOfFundedStatus
Namespace Prefix:	kr_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

Amount of contributions made to multiemployer plans by the employer. A multiemployer plan is a pension or postretirement benefit plan to which two or more unrelated employers contribute where assets contributed by one participating employer may be used to provide benefits to employees of other participating employers.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 80
-Section 50
-Paragraph 11
-URI http://asc.fasb.org/extlink&oid=65877416&loc=SL14450702-114947

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 80
-Section 50
-Paragraph 9
-URI http://asc.fasb.org/extlink&oid=65877416&loc=SL14450691-114947

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 80
-Section 50
-Paragraph 5
-Subparagraph (e)(1)
-URI http://asc.fasb.org/extlink&oid=65877416&loc=SL14450657-114947

Name:	us-gaap_MultiemployerPlanPeriodContributions
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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.

No definition available.