This element represents the percentage of sales and EBITDA for its only reportable segment to total sales.

No definition available.

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

- Definition

This element represents the percentage of sales for this product to the total during the reporting period.

+ References

No definition available.

+ Details

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

- Definition

Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements.

+ References

No definition available.

+ Details

Name:	us-gaap_NumberOfReportableSegments
Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

Aggregate revenue during the period from the sale of goods in the normal course of business, after deducting returns, allowances and discounts.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03.1(a))

-URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 1

-Article 5

+ Details

Name:	us-gaap_SalesRevenueGoodsNet
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Details

Name:	us-gaap_SegmentReportingInformationLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	us-gaap_ProductOrServiceAxis=kr_NonPerishableMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_ProductOrServiceAxis=kr_OtherProductMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_ProductOrServiceAxis=kr_PerishableMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_ProductOrServiceAxis=kr_PharmacyMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_ProductOrServiceAxis=us-gaap_FuelMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

ACCOUNTING POLICIES (Details 2) (USD $) In Millions, unless otherwise specified	3 Months Ended						4 Months Ended		12 Months Ended
	Jan. 31, 2015	Nov. 08, 2014	Aug. 16, 2014	Feb. 01, 2014	Nov. 09, 2013	Aug. 17, 2013	May 24, 2014	May 25, 2013	Jan. 31, 2015 segment	Feb. 01, 2014 segment	Feb. 02, 2013 segment
Segments
Company's retail operations (as a percent)									99.00%kr_CompanyRetailOperationPercentOfSales
Number of segments									1us-gaap_NumberOfReportableSegments	1us-gaap_NumberOfReportableSegments	1us-gaap_NumberOfReportableSegments
Total Sales and other revenue	$ 25,207us-gaap_SalesRevenueGoodsNet	$ 24,987us-gaap_SalesRevenueGoodsNet	$ 25,310us-gaap_SalesRevenueGoodsNet	$ 23,222us-gaap_SalesRevenueGoodsNet	$ 22,470us-gaap_SalesRevenueGoodsNet	$ 22,686us-gaap_SalesRevenueGoodsNet	$ 32,961us-gaap_SalesRevenueGoodsNet	$ 29,997us-gaap_SalesRevenueGoodsNet	$ 108,465us-gaap_SalesRevenueGoodsNet	$ 98,375us-gaap_SalesRevenueGoodsNet	$ 96,619us-gaap_SalesRevenueGoodsNet
Percentage of total sales									100.00%kr_PercentageOfTotalSales	100.00%kr_PercentageOfTotalSales	100.00%kr_PercentageOfTotalSales
Non Perishable
Segments
Total Sales and other revenue									54,392	49,229	48,663
Percentage of total sales									50.10%	50.00%	50.40%
Perishable
Segments
Total Sales and other revenue									24,178	20,625	19,761
Percentage of total sales									22.30%	21.00%	20.50%
Fuel
Segments
Total Sales and other revenue									18,850	18,962	18,896
Percentage of total sales									17.40%	19.30%	19.50%
Pharmacy
Segments
Total Sales and other revenue									9,032	8,073	8,018
Percentage of total sales									8.30%	8.20%	8.30%
Other
Segments
Total Sales and other revenue									$ 2,014	$ 1,486	$ 1,281
Percentage of total sales									1.90%	1.50%	1.30%