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ACCOUNTING POLICIES - Interest Rate Risk Management (Details) | 9 Months Ended
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Nov. 10, 2018
ACCOUNTING POLICIES |
Interest rate risk management guideline of floating debt to total debt portfolio (as a percent) | 25.00%

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- Definition Interest rate risk management guideline percentage of floating rate debt to combined total amount of debt portfolio. + References No definition available. + Details
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Namespace Prefix: | kr_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
Name: | us-gaap_AccountingPoliciesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration