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VOLUNTARY RETIREMENT OFFERING (Details) $ in Millions | 4 Months Ended | 12 Months Ended
--- | --- | ---
May 20, 2017 USD ($) employee | Feb. 03, 2018 USD ($)
VOLUNTARY RETIREMENT OFFERING |  |
Number of approximate associates that accepted Voluntary Retirement Offer | employee | 1,300 |
VRO charge, before-tax | $ 184 |
VRO charge, net of tax | 117 |
VRO severance costs and other benefits | 165 |
VRO other non-cash expense | $ 19 |
VRO lump sum cash payments |  | $ 162

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- Definition Number of approximate associates that accepted the Voluntary Retirement Offer. + References No definition available. + Details
Name: | kr_NumberOfAssociatesAcceptedVoluntaryRetirementOffer
Namespace Prefix: | kr_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- Definition Represents the details pertaining to voluntary retirement offering. + References No definition available. + Details
Name: | kr_VoluntaryRetirementOfferingAbstract
Namespace Prefix: | kr_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Represents the before-tax charge associated with Voluntary Retirement Offering. + References No definition available. + Details
Name: | kr_VoluntaryRetirementOfferingBeforeTax
Namespace Prefix: | kr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Amount of lump sum cash payments made during the period for the Voluntary Retirement Offering. + References No definition available. + Details
Name: | kr_VoluntaryRetirementOfferingCashPayments
Namespace Prefix: | kr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Represents the net of tax charge associated with Voluntary Retirement Offering. + References No definition available. + Details
Name: | kr_VoluntaryRetirementOfferingNetOfTax
Namespace Prefix: | kr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Amount of other non-cash expenses resulting from Voluntary Retirement Offering during the period. + References No definition available. + Details
Name: | kr_VoluntaryRetirementOfferingOtherNonCashExpense
Namespace Prefix: | kr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of severance and other benefit expenses resulting from Voluntary Retirement Offering. + References No definition available. + Details
Name: | kr_VoluntaryRetirementOfferingSeveranceCostsAndOtherBenefits
Namespace Prefix: | kr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration