Operating Cash Flows, Direct Method [Abstract] Operating Cash Flows, Direct Method [Abstract] Adjustments to reconcile net earnings to net cash provided by operating activities: Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract] Equity Securities [Line Items] Debt and Equity Securities, FV-NI [Line Items] Repayment of long-term debt Repayments of Long-Term Debt Available For Sale Debt Securities [Table Text Block] Schedule of Available-for-Sale Securities Reconciliation [Table Text Block] Due after five years through ten years Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, after Year 5 Through 10 Net (decrease) increase in cash and cash equivalents Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect Operating lease right-of-use assets Operating Lease, Right-of-Use Asset Dividends and interest received Proceeds from Interest and Dividends Received Inventories Retail Related Inventory, Merchandise Net gain on sale of equity securities previously recognized through fair value adjustment Equity Securities, FV-NI, Realized Gain (Loss) Common Stock, Dividends, Per Share, Declared Common Stock, Dividends, Per Share, Declared Income taxes paid Income Taxes Paid, Net Subsequent Event [Member] Subsequent Event [Member] Costs and expenses: Costs and Expenses [Abstract] Stockholders’ equity: Equity, Attributable to Parent [Abstract] Continuous Unrealized Loss Position, Less than 12 Months, Fair Value Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months Gain on investments Gain (Loss) on Investments Equity Securities [Table] Marketable Securities [Table] Long-term investments Long-Term Investments Basis of Presentation [Text Block] Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block] Unrealized gain (loss) on debt securities net of income taxes Unrealized gain (loss) on debt securities OCI, Debt Securities, Available-for-Sale, Unrealized Holding Gain (Loss), before Adjustment, after Tax Change for ESOP related shares Temporary Equity, Carrying Amount, Period Increase (Decrease) Entities [Table] Entities [Table] Other nonoperating income, net Other Nonoperating Income (Expense) Other operating cash payments Payments for Other Operating Activities Statement of Stockholders' Equity [Abstract] Statement of Stockholders' Equity [Abstract] Operating lease liabilities Operating Lease, Liability, Noncurrent Total adjustments Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities Other noncurrent assets Other Assets, Noncurrent Entity Tax Identification Number Entity Tax Identification Number Acquisition of shares from stockholders Treasury Stock, Shares, Acquired Net cash provided by operating activities Net Cash Provided by (Used in) Operating Activities Statements of Stockholders' Equity (Parenthetical) [Abstract] Statements of Stockholders' Equity (Parenthetical) [Abstract] Statements of Stockholders' Equity (Parenthetical) [Abstract] Investment income Investment Income, Nonoperating Common Stock (Acquired from) Sold to Stockholders Treasury Stock, Common [Member] Cash flows from operating activities: Net Cash Provided by (Used in) Operating Activities [Abstract] Cash paid to employees and suppliers Payments to Suppliers and Employees Schedule of Accumulated Other Comprehensive Earnings (Losses) [Table Text Block] Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block] Debt Securities, Available-for-sale, Unrealized Gain (Loss) [Abstract] Debt Securities, Available-for-Sale, Unrealized Gain (Loss) [Abstract] Prepaid expenses Prepaid Expense, Current Equity Components [Axis] Equity Components [Axis] Local Phone Number Local Phone Number Fair Value Debt Securities, Available-for-Sale Operating and administrative expenses Operating Expenses Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Deferred income taxes Deferred Income Tax Liabilities, Net Total costs and expenses Costs and Expenses Number of debt securities issues contributing to total unrealized losses Debt Securities, Available-for-Sale, Unrealized Loss Position, Number of Positions Changes in operating assets and liabilities providing (requiring) cash: Increase (Decrease) in Operating Capital [Abstract] Additional paid-in capital Additional Paid in Capital, Common Stock Debt Securities, Available-for-sale, Allowance for Credit Losses Debt Securities, Available-for-Sale, Allowance for Credit Loss Entity Small Business Entity Small Business Credit Loss [Abstract] Credit Loss [Abstract] Level 3 [Member] Fair Value, Inputs, Level 3 [Member] Common Stock Common Stock [Member] Total equity Total Equity Total of all equity items, net of receivables from officers, directors, owners, and affiliates of the entity, attributable to both the parent and noncontrolling interests. Debt Securities, Available-for-sale [Line Items] Debt Securities, Available-for-Sale [Line Items] Cash received from customers Proceeds from Customers ESOP, shares cost Employee Stock Ownership Plan Share Cost The cost of ESOP shares subject to put option as of the balance sheet date. Sale of shares to stockholders Stock Issued During Period, Shares, New Issues Entity Emerging Growth Company Entity Emerging Growth Company Unrealized Loss Position, Fair Value Debt Securities, Available-for-Sale, Unrealized Loss Position Cash and cash equivalents Cash and cash equivalents at beginning of period Cash and cash equivalents at end of period Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents Equity Securities Equity Securities, FV-NI, Current Net amortization of investments Accretion (Amortization) of Discounts and Premiums, Investments Entity Central Index Key Entity Central Index Key Current assets: Assets, Current [Abstract] Other Comprehensive Earnings (Losses) [Abstract] Other Comprehensive Income (Loss), Net of Tax [Abstract] Accounts payable and accrued expenses Increase (Decrease) in Accounts Payable and Accrued Liabilities Treasury Stock, Common, Shares Treasury Stock, Common, Shares Investment income before fair value adjustment Investment Income Before Fair Value Adjustment This item represents investment income derived from investments in debt and equity securities consisting of interest income earned from investments in debt securities and on cash and cash equivalents, dividend income from investments in equity securities, and income or expense derived from the amortization of investment related discounts or premiums, respectively, net of related investment expenses. This item also includes realized gains or losses on the sale of debt and equity securities. Excludes unrealized gains on equity securities holdings. Equity Component [Domain] Equity Component [Domain] Financial Instrument [Axis] Financial Instrument [Axis] Current portion of long-term debt Long-Term Debt, Current Maturities Schedule of Available-for-sale Securities [Table] Debt Securities, Available-for-Sale [Table] Fair Value Disclosures [Abstract] Fair Value Disclosures [Abstract] Entity Shell Company Entity Shell Company Comprehensive earnings Comprehensive earnings Comprehensive Income (Loss), Net of Tax, Attributable to Parent Entity Incorporation, State or Country Code Entity Incorporation, State or Country Code Income taxes Accrued Income Taxes, Current Distributed shares subject to put option, fair value Employee Stock Ownership Plan Put Option Distributed Shares Fair Value Fair value of distributed ESOP shares subject to put option as of balance sheet date. Amortized Cost and Fair Value of Available For Sale Debt Securities by Expected Maturity [Table Text Block] Investments Classified by Contractual Maturity Date [Table Text Block] Statement [Table] Statement [Table] Taxable bonds [Member] Corporate Debt Securities [Member] City Area Code City Area Code Current liabilities: Liabilities, Current [Abstract] Net property, plant and equipment Property, Plant and Equipment, Net Total liabilities Liabilities Noncontrolling interests Equity, Attributable to Noncontrolling Interest Dividends per share Common Stock, Dividends, Per Share, Cash Paid Common stock related to ESOP Common Stock Related To Employee Stock Ownership Plan Common Stock Related to Employee Stock Ownership Plan Level 1 [Member] Fair Value, Inputs, Level 1 [Member] Common stock, par value Common Stock, Par or Stated Value Per Share Total current assets Assets, Current Available-for-sale Securities, Debt Maturities [Abstract] Available-for-Sale Securities, Debt Maturities [Abstract] Cash flows from investing activities: Net Cash Provided by (Used in) Investing Activities [Abstract] Reclassification out of Accumulated Other Comprehensive Income [Table] Reclassification out of Accumulated Other Comprehensive Income [Table] Payment for acquisition of common stock Payments for Repurchase of Common Stock Current portion of operating lease liabilities Operating Lease, Liability, Current Investment Income (Loss) [Table Text Block] Investment Income [Table Text Block] Common stock, shares issued Common Stock, Shares, Issued Document Information [Line Items] Document Information [Line Items] Unrealized Losses Debt Securities, Available-for-Sale, Unrealized Loss Due after ten years Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, after Year 10 Investments Marketable Securities Income taxes Increase (Decrease) in Income Taxes Payable Long-term debt Long-Term Debt, Excluding Current Maturities Entity [Domain] Entity [Domain] Due after five years through ten years Debt Securities, Available-for-Sale, Amortized Cost, Maturity, Allocated and Single Maturity Date, after Year 5 Through 10 Subsequent Event Type [Axis] Subsequent Event Type [Axis] Unrealized Loss Position, Accumulated Loss Total, Unrealized Losses Debt Securities, Available-for-Sale, Unrealized Loss Position, Accumulated Loss Equity [Abstract] Equity [Abstract] Fair Value [Abstract] Debt Securities, Available-for-Sale, Fair Value, Fiscal Year Maturity [Abstract] Retained earnings Retained Earnings (Accumulated Deficit) Accumulated depreciation Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment Subsequent Event [Line Items] Subsequent Event [Line Items] Contribution of shares to retirement plans Stock Issued During Period, Shares, Employee Stock Ownership Plan Property, plant and equipment Property, Plant and Equipment, Gross Common stock, shares authorized Common Stock, Shares Authorized Self-insurance reserves Self Insurance Reserve, Noncurrent Fair value adjustment, due to net unrealized gain, on equity securities held at end of period Equity Securities, FV-NI, Unrealized Gain (Loss) Basis of Presentation [Policy Text Block] Basis of Accounting, Policy [Policy Text Block] Net cash used in financing activities Net Cash Provided by (Used in) Financing Activities Retirement Plan [Text Block] Retirement Plans [Text Block] Retirement Plans. Investments [Text Block] Investments in Debt and Marketable Equity Securities (and Certain Trading Assets) Disclosure [Text Block] Other operating cash receipts Proceeds from Other Operating Activities AOCI Attributable to Parent, Net of Tax [Roll Forward] AOCI Attributable to Parent, Net of Tax [Roll Forward] Total stockholders’ equity Beginning Balance Ending Balance Equity, Attributable to Parent Dividends, Common Stock, Cash Dividends, Common Stock, Cash Restricted investments [Member] Debt Securities, Restricted [Member] Debt Securities, Restricted [Member] Treasury stock at cost, 33 shares in 2024 Treasury Stock, Value Amendment Flag Amendment Flag Entity Registrant Name Entity Registrant Name Due in one year or less Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, Year One Reconciliation of net earnings to net cash provided by operating activities: Net Cash Provided by (Used in) Operating Activities, Continuing Operations [Abstract] Deferred income taxes Deferred Income Tax Expense (Benefit) ESOP shares, fair value Employee Stock Ownership Plan (ESOP), Fair Value of Shares Subject to Repurchase Obligation Interest and dividend income Investment Income, Net Subsequent Events [Abstract] Subsequent Events [Abstract] Due in one year or less Debt Securities, Available-for-Sale, Amortized Cost, Maturity, Allocated and Single Maturity Date, Year One Level 2 [Member] Fair Value, Inputs, Level 2 [Member] Fair Value, Measurements, Fair Value Hierarchy [Domain] Fair Value Hierarchy and NAV [Domain] Trade receivables Accounts Receivable, after Allowance for Credit Loss, Current Sale of shares to stockholders Stock Issued During Period, Value, New Issues Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer Entity Address, Postal Zip Code Entity Address, Postal Zip Code Marketable Securities, Realized Gain (Loss) Marketable Securities, Realized Gain (Loss) Document Fiscal Period Focus Document Fiscal Period Focus Dividends Payable, Date of Record Dividends Payable, Date of Record Common stock of $1 par value. Authorized 4,000 shares; issued 3,316 shares in 2024 and 3,294 shares in 2023 Common Stock, Value, Issued Investments [Member] AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-Sale, Parent [Member] ASSETS Assets [Abstract] Net other comprehensive earnings Other Comprehensive Income (Loss), Net of Tax Contribution of shares to retirement plans Stock Issued During Period, Value, Employee Stock Ownership Plan Document Type Document Type Earnings before income tax expense Income (Loss) Attributable to Parent, before Tax Unrealized Gains Debt Securities, Available-for-Sale, Unrealized Gain Accrued expenses: Accrued Liabilities, Current [Abstract] Amortized Cost Total amortized cost Debt Securities, Available-for-Sale, Amortized Cost Cash flows from financing activities: Net Cash Provided by (Used in) Financing Activities [Abstract] Self-insured claims paid Payments For Self Insured Claims Payments for Self Insured Claims Subsequent Event [Table] Subsequent Event [Table] Proceeds from sale and maturity of investments Proceeds from Sale, Maturity and Collection of Investments Debt Securities, Available-for-sale [Abstract] Debt Securities, Available-for-Sale [Abstract] Depreciation and amortization Depreciation, Depletion and Amortization, Nonproduction Earnings per share Earnings Per Share, Basic Accounts payable Accounts Payable, Current Accounting Policies [Abstract] Accounting Policies [Abstract] Proceeds from sale of common stock Proceeds from Issuance of Common Stock Revenues: Revenues [Abstract] Current Fiscal Year End Date Current Fiscal Year End Date Short-term investments Short-Term Investments Available For Sale Debt Securities in an Unrealized Loss Position by Time Period Impaired [Table Text Block] Debt Securities, Available-for-Sale, Unrealized Loss Position, Fair Value [Table Text Block] Document Documentand Entity Information [Abstract] Document Documentand Entity Information [Abstract] Document Documentand Entity Information [Abstract] Total current liabilities Liabilities, Current Common stock related to Employee Stock Ownership Plan (ESOP) Common stock related to ESOP Temporary Equity, Carrying Amount, Attributable to Parent Total assets Assets Increase in last-in, first-out (LIFO) reserve Inventory, LIFO Reserve, Effect on Income, Net Cost of merchandise sold Cost of Goods and Services Sold Payment for capital expenditures Payments to Acquire Property, Plant, and Equipment Other noncurrent liabilities Other Liabilities, Noncurrent Fair Value of Financial Instruments [Text Block] Fair Value Measurement and Measurement Inputs, Recurring and Nonrecurring [Text Block] Additional Paid-in Capital Additional Paid-in Capital [Member] Finance lease liabilities Finance Lease, Liability, Noncurrent Subsequent Event Type [Domain] Subsequent Event Type [Domain] Common Stock Related To ESOP Common Stock Related To Esop [Member] Common Stock Related To ESOP [Member] Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Total revenues Revenues Inventories Increase (Decrease) in Retail Related Inventories Entity Interactive Data Current Entity Interactive Data Current Entity Address, City or Town Entity Address, City or Town Due after one year through five years Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, after Year One Through Five Retirement Benefits [Abstract] Retirement Benefits [Abstract] Net earnings Net earnings Net Income (Loss) Attributable to Parent Investments, Debt and Equity Securities [Abstract] Investments, Debt and Equity Securities [Abstract] Statement of Financial Position [Abstract] Statement of Financial Position [Abstract] Accumulated Other Comprehensive Earnings (Losses) [Text Block] Comprehensive Income (Loss) Note [Text Block] Retirement contributions paid or payable in common stock Share-Based Payment Arrangement, Noncash Expense Due after ten years Debt Securities, Available-for-Sale, Amortized Cost, Maturity, Allocated and Single Maturity Date, after Year 10 Entity File Number Entity File Number Postretirement Benefit Obligation [Member] Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member] Gain on disposal and impairment of long-lived assets Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal Proceeds from sale of property, plant and equipment Proceeds from Sale of Property, Plant, and Equipment Income tax expense Income Tax Expense (Benefit) Document Fiscal Year Focus Document Fiscal Year Focus Total fair value Debt Securities, Available-for-Sale, Maturity, Allocated and Single Maturity Date, Fair Value Income Statement [Abstract] Income Statement [Abstract] Entity Address, Address Line One Entity Address, Address Line One Acquisition of shares from stockholders Treasury Stock, Value, Acquired, Cost Method Dividends per share Dividends, Common Stock Other Other Accrued Liabilities, Current Document Period End Date Document Period End Date Sales Revenue from Contract with Customer, Excluding Assessed Tax Other liabilities Increase (Decrease) in Other Noncurrent Liabilities Statement of Comprehensive Income [Abstract] Statement of Comprehensive Income [Abstract] Contributions to retirement plans Employee Stock Ownership Plan 401 K Payable Current The total amount of the entity's current obligation as of the balance sheet date under its ESOP and 401(k) retirement plans. Net cash used in investing activities Net Cash Provided by (Used in) Investing Activities Operating profit Operating Income (Loss) Total liabilities and stockholders' equity Liabilities and Equity Subsequent Events [Text Block] Subsequent Events [Text Block] Fair Value Hierarchy and NAV [Axis] Fair Value Hierarchy and NAV [Axis] Salaries and wages Employee-related Liabilities, Current Other assets Increase (Decrease) in Prepaid Expense and Other Assets Dividends Payable, Date to be Paid Dividends Payable, Date to be Paid Amortized Cost [Abstract] Debt Securities, Available-for-Sale, Amortized Cost, Fiscal Year Maturity [Abstract] Fair Value of Financial Instruments [Table Text Block] Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Table Text Block] Reclassification out of Accumulated Other Comprehensive Income [Line Items] Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] Debt Securities, Available-for-sale [Line Items] Debt Securities, Available-for-Sale, Unrealized Loss Position [Line Items] Dividends paid Payments of Dividends Legal Entity [Axis] Legal Entity [Axis] Document Transition Report Document Transition Report Document Quarterly Report Document Quarterly Report Due after one year through five years Debt Securities, Available-for-Sale, Amortized Cost, Maturity, Allocated and Single Maturity Date, after Year One Through Five Fair Value, Recurring and Nonrecurring [Table] Fair Value, Recurring and Nonrecurring [Table] Accumulated other comprehensive losses Balances at Beginning of Period Balances at End of Period Accumulated Other Comprehensive Income (Loss), Net of Tax Entity Current Reporting Status Entity Current Reporting Status Retained Earnings Retained Earnings [Member] Accumulated Other Comprehensive Earnings (Losses) AOCI Attributable to Parent [Member] Weighted average shares outstanding Weighted Average Number of Shares Outstanding, Basic Unrealized gain (loss) on debt securities income taxes OCI, Debt Securities, Available-for-Sale, Unrealized Holding Gain (Loss), before Adjustment, Tax Entity Address, State or Province Entity Address, State or Province Statement [Line Items] Statement [Line Items] Other operating income Other Operating Income Self-insurance reserves Self Insurance Reserve, Current Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss Increase (Decrease) in Stockholders' Equity [Roll Forward] Increase (Decrease) in Stockholders' Equity [Roll Forward] Investment Income, Net [Abstract] Investment Income, Net [Abstract] Payment for investments Payments to Acquire Investments Financial Instruments [Domain] Financial Instruments [Domain] Dividends Payable, Date Declared Dividends Payable, Date Declared Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss LIABILITIES AND EQUITY Liabilities and Equity [Abstract] Entity Filer Category Entity Filer Category Trade receivables Increase (Decrease) in Accounts and Other Receivables