Document and Entity Information [Abstract] Document Information [Table] Legal Entity [Axis] Legal Entity [Axis] Entity [Domain] Entity [Domain] Represents the Retirement Plan Number 003 being Harris Teeter Supermarkets, Inc. Retirement and Savings Plan. E B P 003 [Member] Harris Teeter Supermarkets, Inc. Retirement and Savings Plan Document Information [Line Items] Document Type Entity Registrant Name Entity Tax Identification Number Entity tax identification number Entity Central Index Key Amendment Flag STATEMENTS OF NET ASSETS AVAILABLE FOR BENEFITS EBP, Statement of Net Asset Available for Benefit [Table] Investment Type [Axis] Investments [Domain] Mutual Fund [Member] Mutual funds Common Collective Trust [Member] Common collective trust funds EBP, Employer, Common Stock [Member] Kroger shares EBP, Statement of Net Asset Available for Benefit [Line Items] STATEMENTS OF NET ASSETS AVAILABLE FOR BENEFITS EBP, Asset [Abstract] ASSETS EBP, Noninterest-Bearing Cash Cash EBP, Investment, Excluding Plan Interest in Master Trust, Contract Value Investment, at contract value EBP, Investment, Fair Value [Abstract] Investments, at fair value: EBP, Investment, Excluding Plan Interest in Master Trust, Fair Value Investments, at fair value EBP, Receivable [Abstract] Receivables: EBP, Participant Contribution, Receivable Participant contributions EBP, Employer Contribution, Receivable Employer contributions EBP, Note Receivable from Participant Notes receivable from participants EBP, Receivable Total Receivables EBP, Asset Total Assets EBP, Liability [Abstract] LIABILITIES EBP, Accrued Expense Administrative expenses payable EBP, Net Asset Available for Benefit NET ASSETS AVAILABLE FOR BENEFITS, end of year NET ASSETS AVAILABLE FOR BENEFITS, beginning of year Net assets available for benefits per the financial statements NET ASSETS AVAILABLE FOR BENEFITS STATEMENT OF CHANGES IN NET ASSETS AVAILABLE FOR BENEFITS EBP, Statement of Change in Net Asset Available for Benefit [Table] EBP, Statement of Change in Net Asset Available for Benefit [Line Items] STATEMENT OF CHANGES IN NET ASSETS AVAILABLE FOR BENEFITS EBP, Change in Net Asset Available for Benefit, Increase [Abstract] Additions: EBP, Change in Net Asset Available for Benefit, Increase (Decrease) from Income (Loss) on Investment [Abstract] Investment income: EBP, Change in Net Asset Available for Benefit, Increase (Decrease) from Unrealized Gain (Loss) on Investment Net appreciation in fair value of investments EBP, Change in Net Asset Available for Benefit, Increase from Dividend Income on Investment Dividends EBP, Change in Net Asset Available for Benefit, Increase (Decrease) from Income (Loss) on Investment Net investment income EBP, Change in Net Asset Available for Benefit, Increase from Interest Income on Note Receivable from Participant Interest income on notes receivable from participants EBP, Change in Net Asset Available for Benefit, Increase from Contribution [Abstract] Contributions: EBP, Change in Net Asset Available for Benefit, Increase from Participant Contribution Participant EBP, Change in Net Asset Available for Benefit, Increase from Employer Contribution, Cash and Noncash Employer EBP, Change in Net Asset Available for Benefit, Increase from Contribution Total Contributions Amount of increase in net asset available for benefit from other income by employee stock purchase, saving, or similar plan (employee benefit plan (EBP)). Employee Benefit Plan Change In Net Asset Available For Benefit Increase From Other Income Other income EBP, Change in Net Asset Available for Benefit, Increase Total Additions EBP, Change in Net Asset Available for Benefit, Decrease [Abstract] Deductions: EBP, Change in Net Asset Available for Benefit, Decrease from Payment to Participant Benefits paid to participants EBP, Change in Net Asset Available for Benefit, Decrease from Administrative Expense Administrative expenses EBP, Change in Net Asset Available for Benefit, Decrease Total Deductions EBP, Change in Net Asset Available for Benefit, Increase (Decrease) Net change in net assets available for benefits per the financial statements NET INCREASE IN NET ASSETS AVAILABLE FOR BENEFITS DESCRIPTION OF THE PLAN EBP, Description of Plan [Table] EBP, Description of Plan [Line Items] DESCRIPTION OF THE PLAN PLAN TERMINATION EBP, Description of Plan [Text Block] DESCRIPTION OF THE PLAN SIGNIFICANT ACCOUNTING POLICIES EBP, Accounting Policy [Table] EBP, Accounting Policy [Line Items] SIGNIFICANT ACCOUNTING POLICIES EBP, Summary of Accounting Policy [Text Block] Summary of Accounting Policy [Text Block] FAIR VALUE MEASUREMENTS EBP, Investment, Fair Value and NAV [Table] EBP, Investment, Fair Value and NAV [Line Items] FAIR VALUE MEASUREMENTS EBP, Investment, Fair Value and NAV [Text Block] FAIR VALUE MEASUREMENTS STABLE VALUE FUND EBP, Fully Benefit-Responsive Investment Contract [Table] EBP, Fully Benefit-Responsive Investment Contract [Line Items] STABLE VALUE FUND EBP, Fully Benefit-Responsive Investment Contract [Text Block] STABLE VALUE FUND INCOME TAX STATUS EBP, Tax Status [Table] EBP, Tax Status [Line Items] INCOME TAX STATUS EBP, Tax Status [Text Block] INCOME TAX STATUS No definition available. PLAN TERMINATION EBP, Plan Termination [Text Block] PLAN TERMINATION PARTY-IN-INTEREST TRANSACTIONS EBP, Related Party and Party-in-Interest Transactions [Table] EBP, Related Party and Party-in-Interest Transactions [Line Items] PARTY-IN-INTEREST TRANSACTIONS EBP, Related Party and Party-in-Interest Transactions [Text Block] PARTY-IN-INTEREST TRANSACTIONS RISKS AND UNCERTAINTIES EBP, Risk and Uncertainty [Table] EBP, Risk and Uncertainty [Line Items] RISKS AND UNCERTAINTIES EBP, Risk and Uncertainty [Text Block] RISKS AND UNCERTAINTIES SUBSEQUENT EVENTS EBP, Subsequent Event [Table] EBP, Subsequent Event [Line Items] SUBSEQUENT EVENTS EBP, Subsequent Event [Text Block] SUBSEQUENT EVENTS RECONCILIATION OF FINANCIAL STATEMENTS TO FORM 5500 EBP, Reconciliation of Financial Statement to Form 5500 [Table] EBP, Reconciliation of Financial Statement to Form 5500 [Line Items] RECONCILIATION OF FINANCIAL STATEMENTS TO FORM 5500 EBP, Reconciliation of Financial Statement to Form 5500 [Text Block] RECONCILIATION OF FINANCIAL STATEMENTS TO FORM 5500 SCHEDULE H, LINE 4i - SCHEDULE OF ASSETS (HELD AT END OF YEAR) EBP, Schedule of Asset Held for Investment [Table] EBP, Schedule of Asset Held for Investment [Line Items] SCHEDULE H, LINE 4i - SCHEDULE OF ASSETS (HELD AT END OF YEAR) EBP, Schedule of Asset Held for Investment [Text Block] SCHEDULE H, LINE 4i - SCHEDULE OF ASSETS (HELD AT END OF YEAR) EBP, Basis of Accounting [Policy Text Block] Basis of Accounting EBP, Use of Estimate [Policy Text Block] Use of Estimates Disclosure of accounting policy for fully benefit-responsive investment contract held by employee stock purchase, saving, or similar plan (employee benefit plan (EBP)). Employee Benefit Plan, Fully Benefit-Responsive Investment Contract [Policy Text Block] Fully Benefit-Responsive Investment Contracts EBP, Investment [Policy Text Block] Investment Valuation and Income Recognition EBP, Note Receivable from Participant [Policy Text Block] Notes Receivable from Participants EBP, Expense [Policy Text Block] Administrative Expenses EBP, Payment to Participant [Policy Text Block] Payment of Benefits EBP, Investment, Fair Value and NAV [Table Text Block] Schedule of Plan's Assets Fair Value Hierarchy Disclosure of investments whose fair value is estimated using net asset value (NAV) per share (or its equivalent), including related information such as fair value, unfunded commitments, redemption frequency, redemption notice periods, and other terms and conditions associated with the investments. Employee Benefit Plan, Investment, Fair Value Estimated Using NAV Per Share [Table Text Block] Tabular disclosure of additional disclosures of Plan's investments whose fair value is estimated using NAV per share EBP, Reconciliation of Financial Statement to Form 5500 [Table Text Block] Reconciliation of net assets available for benefits per the financial statements Statistical Measurement [Axis] Statistical Measurement [Domain] Maximum [Member] Maximum Minimum [Member] Minimum Represents the minimum service period for plan eligibility under employee stock purchase, saving, or similar plan (employee benefit plan (EBP)). Employee Benefit Plan, Minimum Service Period For Plan Eligibility Minimum service period for Plan eligibility EBP, Participant Contribution, Pretax, Maximum Annual Compensation to Total Compensation, Percentage Participant contribution (as a percent) EBP, Employer Contribution, Participant Compensation Matched, Percentage Employer matching contribution (as a percent) Represents the minimum age criteria for the eligibility of Automatic Retirement Contribution under employee stock purchase, saving, or similar plan (employee benefit plan (EBP)). Employee Benefit Plan, Automatic Retirement Contribution, Minimum Age Minimum age for Automatic Retirement Contribution Represents the minimum service hours per year for the eligibility of Automatic Retirement Contribution under employee stock purchase, saving, or similar plan (employee benefit plan (EBP)). Employee Benefit Plan, Automatic Retirement Contribution, Minimum Hours Of Service Minimum service hours for Automatic Retirement Contribution Represents the minimum age for retirement criteria for Automatic Retirement Contribution under employee stock purchase, saving, or similar plan (employee benefit plan (EBP)). Employee Benefit Plan, Automatic Retirement Contribution, Minimum Age For Retirement Minimum age for retirement under Automatic Retirement Contribution Represents the minimum age for termination criteria for Automatic Retirement Contribution under employee stock purchase, saving, or similar plan (employee benefit plan (EBP)). Employee Benefit Plan, Automatic Retirement Contribution, Minimum Age For Termination Minimum age for termination under Automatic Retirement Contribution Represents the minimum age for termination with respect to age plus service criteria for Automatic Retirement Contribution under employee stock purchase, saving, or similar plan (employee benefit plan (EBP)). Employee Benefit Plan, Automatic Retirement Contribution, Minimum Age For Termination, Age and Service Criteria Minimum age for termination, age and service criteria under Automatic Retirement Contribution Percentage of compensation allocation for Automatic Retirement Contribution under employee stock purchase, saving, or similar plan (employee benefit plan (EBP)). Employee Benefit Plan, Automatic Retirement Contribution, Percentage Of Contribution Allocation Percentage of contribution allocation under Automatic Retirement Contribution Represents the minimum age for retirement under employee stock purchase, saving, or similar plan (employee benefit plan (EBP)). Employee Benefit Plan, Minimum Age For Retirement Minimum age for retirement Threshold percentage of participant contributions permitted to be invested in employer stock under an employee stock purchase, savings, or similar plan (employee benefit plan (EBP)). Employee Benefit Plan, Threshold Percentage Of Employer Stock Investment Threshold percentage allowed in employer stock Amount of recordkeeping fees incurred for employee stock purchase, saving, or similar plan (employee benefit plan (EBP)). Employee Benefit Plan, Recordkeeping Fees Recordkeeping fee Amount of administrative fee credit under employee stock purchase, saving, or similar plan (employee benefit plan (EBP)). Employee Benefit Plan, Administrative Fee Credit Administrative fee credit Threshold age that participant must attain for withdrawals in employee stock purchase, saving, or similar plan (employee benefit plan (EBP)). Employee Benefit Plan, Participant Withdrawals, Threshold Age Threshold age for withdrawal Represents the minimum service period for full vesting under employee stock purchase, saving, or similar plan (employee benefit plan (EBP)). Employee Benefit Plan, Full Vesting, Minimum Service Period Minimum service period for full vesting Represents the minimum service hours per year for the eligibility of vesting under employee stock purchase, saving, or similar plan (employee benefit plan (EBP)). Employee Benefit Plan, Vesting, Minimum Hours Of Service Minimum service hours for Automatic Retirement Contribution Represents the number of consecutive breaks in service for forfeiture in employee stock purchase, saving, or similar plan (employee benefit plan (EBP)). Employee Benefit Plan, Number of Consecutive Breaks in Service for Forfeiture Number of consecutive breaks in service for forfeiture EBP, Forfeited Nonvested Account, Decrease from Employer Contribution Forfeitures utilized to offset Employer contributions EBP, Forfeited Nonvested Account Forfeited account balance Scenario [Axis] Scenario [Domain] Represents information pertaining to Automatic Retirement Contribution, Roth, and Merged ESOP subaccounts. Automatic Retirement Contribution, Roth, And Merged ESOP Subaccounts [Member] ARC, Roth, and Merged ESOP subaccounts Represents information pertaining to accounts other than Automatic Retirement Contribution, Roth, and Merged ESOP subaccounts. Other Than Automatic Retirement Contribution, Roth, and Merged ESOP Subaccounts [Member] Other than ARC, Roth, and Merged ESOP subaccounts EBP, Note Receivable from Participant, Account, Minimum Borrowing, Amount Minimum amount that participant may borrow EBP, Note Receivable from Participant, Account, Maximum Borrowing, Amount Maximum amount that participant may borrow EBP, Note Receivable from Participant, Account, Maximum Borrowing, to Total Account, Percentage Maximum vested account balance for loans (as a percent) Number of participant loans permitted to be taken in a year under employee stock purchase, saving, or similar plan (employee benefit plan (EBP)). Employee Benefit Plan, Note Receivable From Participant, Number Of Loans Per Year Allowed To Be Taken Number of loans per year allowed to be taken The number of days that must elapse after a participant has an outstanding loan before the participant becomes eligible to apply for a new loan under employee stock purchase, saving, or similar plan (employee benefit plan (EBP)). Employee Benefit Plan, Note Receivable From Participant, Cooling Off Period For Borrowing New Loans Cooling off period for borrowing new loans The maximum term of participant loan of employee stock purchase, saving, or similar plan (employee benefit plan (EBP)). Employee Benefit Plan, Note Receivable From Participant, Maximum Term Maximum loan term Represents the percentage points added to the prime rate to compute the interest rate on participant loans under employee stock purchase, saving, or similar plan (employee benefit plan (EBP)). Employee Benefit Plan, Note Receivable From Participant, Basis Spread On Prime Rate Basis spread on prime rate (as a percent) EBP, Asset Held for Investment, Participant Loan, Interest Rate Interest rates for participants loans Fair Value Hierarchy and NAV [Axis] Fair Value Hierarchy and NAV [Axis] Fair Value Hierarchy and NAV [Domain] Fair Value Hierarchy and NAV [Domain] Fair Value, Inputs, Level 1, Level 2, and Level 3 [Member] Fair value Fair Value, Inputs, Level 1 [Member] Level 1 Fair Value Measured at Net Asset Value Per Share [Member] NAV Represents the information pertaining to TRP Retirement Blend 2005. TRP Retirement Blend 2005 [Member] TRP Retirement Blend 2005 Represents the information pertaining to TRP Retirement Blend 2010. TRP Retirement Blend 2010 [Member] TRP Retirement Blend 2010 Represents the information pertaining to TRP Retirement Blend 2015. TRP Retirement Blend 2015 [Member] TRP Retirement Blend 2015 Represents the information pertaining to TRP Retirement Blend 2020. TRP Retirement Blend 2020 [Member] TRP Retirement Blend 2020 Represents the information pertaining to TRP Retirement Blend 2025. TRP Retirement Blend 2025 [Member] TRP Retirement Blend 2025 Represents the information pertaining to TRP Retirement Blend 2030. TRP Retirement Blend 2030 [Member] TRP Retirement Blend 2030 Represents the information pertaining to TRP Retirement Blend 2035. TRP Retirement Blend 2035 [Member] TRP Retirement Blend 2035 Represents the information pertaining to TRP Retirement Blend 2040. TRP Retirement Blend 2040 [Member] TRP Retirement Blend 2040 Represents the information pertaining to TRP Retirement Blend 2045. TRP Retirement Blend 2045 [Member] TRP Retirement Blend 2045 Represents the information pertaining to TRP Retirement Blend 2050. TRP Retirement Blend 2050 [Member] TRP Retirement Blend 2050 Represents the information pertaining to TRP Retirement Blend 2055. TRP Retirement Blend 2055 [Member] TRP Retirement Blend 2055 Represents the information pertaining to TRP Retirement Blend 2060. TRP Retirement Blend 2060 [Member] TRP Retirement Blend 2060 Represents the information pertaining to TRP Retirement Blend 2065. TRP Retirement Blend 2065 [Member] TRP Retirement Blend 2065 Represents the information pertaining to Retirement Blend 2020 Trust. Retirement Blend 2020 Trust [Member] Retirement Blend 2020 Trust Represents the information pertaining to EARNEST SMID Cap Core Class I. EARNEST SMID Cap Core Class I [Member] EARNEST SMID Cap Core Class I Represents the information pertaining to GMO Quality An. GMO Quality An [Member] GMO Quality An Represents the information pertaining to Harding Loevner Intl Eq. Harding Loevner Intl Eq [Member] Harding Loevner Intl Eq Represents the information pertaining to Loomis Sayles Core Plus Fixed Income. Loomis Sayles Core Plus Fixed Income [Member] Loomis Sayles Core Plus Fixed Income Represents the information pertaining to State Street Global All Cap Eq ex-US. State Street Global All Cap Eq ex-US [Member] State Street Global All Cap Eq ex-US Represents the information pertaining to State Street SMMID Cap Index Class II. State Street SMMID Cap Index Class II [Member] State Street SMMID Cap Index Class II Represents the information pertaining to State Street S&P 500 Index. State Street S&P 500 Index [Member] State Street S&P 500 Index Represents the information pertaining to State Street US Bond Index. State Street US Bond Index [Member] State Street US Bond Index EBP, Fair Value, Investment, NAV, Unfunded Commitment Unfunded commitment EBP, Fair Value, Investment, NAV, Redemption, Notice Period Redemption Notice Period EBP, Tax Determination Letter, Obtained [true false] Determination letter obtained EBP, Tax Determination Letter, Date Determination letter date EBP, Related Party and Party-in-Interest [Axis] EBP, Related Party and Party-in-Interest [Domain] Employer of participant in employee stock purchase, saving, or similar plan (employee benefit plan (EBP)). Employee Benefit Plan, Employer [Member] Kroger EBP, Trustee [Member] Trustee Represents information pertaining to fully benefit responsive investment contract at contract value. FULLY BENEFIT-RESPONSIVE INVESTMENT CONTRACT [Member] FULLY BENEFIT-RESPONSIVE INVESTMENT CONTRACT EBP, Investment, Number of Shares Number of Shares EBP, Form 5500 Caption, Net Assets [Abstract] Reconciliation of net assets available for benefits EBP, Reconciliation to Form 5500, Net Asset Available for Benefit, Contract Value to Current Value Adjustment Adjustment from contract value to fair value for fully benefit- responsive investment contracts EBP, Form 5500 Caption, Net Assets Net assets available for benefits per the Form 5500 EBP, Form 5500 Caption, Net Income (Loss) [Abstract] EBP, Form 5500 Caption, Net Income (Loss) [Abstract] Amount of the increase in net assets available for benefits included in the reconciliation to Form 5500 resulting from the reversal of the prior year's adjustment for fully benefit-responsive investment contracts. Employee Benefit Plan, Reconciliation To Form 5500, Change In Net Asset Available For Benefit Increase From Prior Year Fully Benefit-Responsive Investment Contracts Value Adjustment Prior year adjustment from contract value to fair value for fully benefit-responsive investment contracts Amount of the decrease in net assets available for benefits included in the reconciliation to Form 5500 resulting from the current year's adjustment for fully benefit-responsive investment contracts. Employee Benefit Plan, Reconciliation To Form 5500, Change In Net Asset Available For Benefit Decrease From Current Year Fully Benefit-Responsive Investment Contracts Value Adjustment Current year adjustment from contract value to fair value for fully benefit-responsive investment contracts EBP, Form 5500 Caption, Net Income (Loss) Net income per the Form 5500 Investment, Identifier [Axis] EBP, Plan Number Plan number EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Current Value Current Value EBP, Asset Held for Investment, Party-in-Interest [true false] EBP, Asset Held for Investment, Party-in-Interest [true false] EBP, Investment, Issuer Name [Extensible Enumeration] EBP, Investment, Issuer Name [Extensible Enumeration] EBP, Investment, Current Value, Type [Extensible Enumeration] EBP, Investment, Current Value, Type [Extensible Enumeration] EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Participation Status [Extensible Enumeration] EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Participation Status [Extensible Enumeration] EBP, Asset Held for Investment, Participant Loan, after Deemed Distribution Loans to participants EBP, Asset Held for Investment Total assets