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| | <Log type="Warning"> [dq-0542-Deprecated-Concept] Concept CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption in us-gaap/2019 used in 2 facts was deprecated in us-gaap/2020 as of 2020-01-31 and should not be used. kr-20200815x10q.htm line 14, kr-20200815x10q.htm line 14 </Log> |
| | <Log type="Warning"> [dq-0542-Deprecated-Concept] Concept MultiemployerPlanTypeAxis in us-gaap/2019 used in 8 facts was deprecated in us-gaap/2020 as of 2020-01-31 and should not be used. kr-20200815x10q.htm line 18, kr-20200815x10q.htm line 18, kr-20200815x10q.htm line 18, kr-20200815x10q.htm line 18, kr-20200815x10q.htm line 18, kr-20200815x10q.htm line 18, kr-20200815x10q.htm line 18, kr-20200815x10q.htm line 18 </Log> |
| | <Log type="Warning"> [dq-0542-Deprecated-Concept] Concept MultiemployerPlansPensionMember in us-gaap/2019 used in 8 facts was deprecated in us-gaap/2020 as of 2020-01-31 and should not be used. kr-20200815x10q.htm line 18, kr-20200815x10q.htm line 18, kr-20200815x10q.htm line 18, kr-20200815x10q.htm line 18, kr-20200815x10q.htm line 18, kr-20200815x10q.htm line 18, kr-20200815x10q.htm line 18, kr-20200815x10q.htm line 18 </Log> |
| | <Log type="Warning"> [dq-0542-Deprecated-Concept] Concept MultiemployerPlanNameAxis in us-gaap/2019 used in 4 facts was deprecated in us-gaap/2020 as of 2020-01-31 and should not be used. kr-20200815x10q.htm line 18, kr-20200815x10q.htm line 18, kr-20200815x10q.htm line 18, kr-20200815x10q.htm line 18 </Log> |
| | <Log type="Warning"> [ix-0514-Hidden-Fact-Eligible-For-Transform] WARN: 2 fact(s) appearing in ix:hidden were eligible for transformation: us-gaap:DefinedBenefitPlanContributionsByEmployer </Log> |
| | <Log type="Warning"> [ix-0514-Hidden-Fact-Not-Referenced] WARN: 2 fact(s) appearing in ix:hidden were not referenced by any -sec-ix-hidden style property: us-gaap:CommitmentsAndContingencies </Log> |
| | </Logs> |
| <InputFiles> |
| | <File doctype="10-Q" original="kr-20200815x10q.htm"> kr-20200815x10q.htm </File> |
| | <File> kr-20200815.xsd </File> |
| | <File> kr-20200815_cal.xml </File> |
| | <File> kr-20200815_def.xml </File> |
| | <File> kr-20200815_lab.xml </File> |
| | <File> kr-20200815_pre.xml </File> |
| | <File> kr-20200815ex311b84479.htm </File> |
| | <File> kr-20200815ex3121898ee.htm </File> |
| | <File> kr-20200815ex3213c08d7.htm </File> |
| | </InputFiles> |
| <SupplementalFiles> |
| | <File> kr-20200815x10q004.jpg </File> |
| | </SupplementalFiles> |
| <BaseTaxonomies> |
| | <BaseTaxonomy> http://fasb.org/srt/2019-01-31 </BaseTaxonomy> |
| | <BaseTaxonomy> http://fasb.org/us-gaap/2019-01-31 </BaseTaxonomy> |
| | <BaseTaxonomy> http://xbrl.sec.gov/dei/2019-01-31 </BaseTaxonomy> |
| | </BaseTaxonomies> |
| <HasPresentationLinkbase> true </HasPresentationLinkbase> |
| <HasCalculationLinkbase> true </HasCalculationLinkbase> |
| </FilingSummary> |