ACCOUNTING POLICIES - Interest Rate Risk Management (Details)	6 Months Ended
Aug. 18, 2018
ACCOUNTING POLICIES
Interest rate risk management guideline of floating debt to total debt portfolio (as a percent)	25.00%

Interest rate risk management guideline percentage of floating rate debt to combined total amount of debt portfolio.

No definition available.

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