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

Amount of additional contributions, net of tax, to be 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.

No definition available.

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

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

No definition available.

Name:	kr_MultiemployerPlansCommitmentAndWithdrawalObligationAfterTax
Namespace Prefix:	kr_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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:	debit
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 commitment to transition reserve in new variable annuity pension plan.

No definition available.

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

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

No definition available.

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

The period over which repayment of withdrawal and transition reserve commitment liability will be settled.

No definition available.

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

The designation of funds furnished by a borrower to a lender to assure future payments of the borrower's real estate taxes and insurance obligations with respect to a mortgaged property. Escrow deposits may be made for a variety of other purposes such as earnest money and contingent payments. This element excludes replacement reserves which are an escrow separately provided for within the US GAAP taxonomy.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03.10)
-URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878

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

Amount of cost for employer contribution to multiemployer plan. Multiemployer plan includes, but is not limited to, pension plan determined to be individually significant and insignificant and other postretirement benefit plan.

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 80
-Section 55
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=35742348&loc=SL14450788-114948

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 80
-Section 35
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=29639808&loc=d3e29008-114946

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-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 4: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 80
-Section 50
-Paragraph 9
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=65877416&loc=SL14450691-114947

Name:	us-gaap_MultiemployerPlanEmployerContributionCost
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.