Number of associates eligible for voluntary retirement offer.

No definition available.

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

- Definition

Represents the number of locations, in which withdrawal liabilities process has been initiated.

+ References

No definition available.

+ Details

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

- Definition

The amount of voluntary retirement offering charge expected to be recognized.

+ References

No definition available.

+ Details

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

- Definition

Amount of the obligation recognized by withdrawing from 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.

+ References

No definition available.

+ Details

Name:	us-gaap_MultiemployerPlansWithdrawalObligation
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event.

+ References

No definition available.

+ Details

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Balance Type:	na
Period Type:	duration

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_MultiemployerPlanTypeAxis=us-gaap_MultiemployerPlansPensionMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RangeAxis=us-gaap_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

SUBSEQUENT EVENT (Details) $ in Millions	4 Months Ended	12 Months Ended
SUBSEQUENT EVENT (Details) $ in Millions	May 20, 2017 USD ($) item	Jan. 28, 2017 item
SUBSEQUENT EVENT
Number of associates eligible for Voluntary Retirement Offer \| item		1,300
Subsequent Events
SUBSEQUENT EVENT
Anticipated VRO, pre-tax \| $	$ 180
Subsequent Events \| Multi-employer Pension Plan
SUBSEQUENT EVENT
Number of locations initiated a withdrawal process \| item	2
Subsequent Events \| Maximum \| Multi-employer Pension Plan
SUBSEQUENT EVENT
Withdrawal liability \| $	$ 100