Accounting Policies [Abstract] Summary of Significant Accounting Policies [Abstract] Accounts Payable And Accrued Liabilities Current Accounts payable and accrued expenses Accounts Receivable Accounts Receivable [Member] Total receivables Accounts Receivable, Net, Current Trade and other receivables, net Accumulated Other Comprehensive Income (Loss) [Member] AOCI Attributable to Parent [Member] Accum. Other Comp. Loss [Member] Accumulated other comprehensive loss, net of tax Accumulated Other Comprehensive Income (Loss), Net of Tax Accumulated other comprehensive income (loss), net of tax Paid In Capital [Member] Additional Paid-in Capital [Member] Paid-in capital Additional Paid in Capital, Common Stock Advertising expense Advertising Expense Advertising Costs [Policy Text Block] Advertising Costs Feed and supplies Agricultural Related Inventory, Feed and Supplies Stock based compensation expense Share-based Payment Arrangement, Expense Allowance for doubtful accounts Accounts Receivable, Allowance for Credit Loss, Current Reserves for credit losses Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount Antidilutive restricted shares Asset Impairment Charges Impairment loss on property, plant & equipment Asset Backed Securities [Member] Asset-backed Securities [Member] Assets measured at fair value Assets, Fair Value Disclosure Assets Assets [Abstract] Total Assets Total assets Assets Total current assets Assets, Current Current assets: Assets, Current [Abstract] 1-5 years Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Rolling after One Through Five Years, Fair Value Within one year Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Rolling within One Year, Fair Value Available For Sale Securities Debt Securities Current Estimated Fair Value, Current Debt Securities, Available-for-sale, Noncurrent Estimated Fair Value, Noncurrent Total Debt Securities, Available-for-sale Investment securities available-for-sale Basis of Presentation Basis Of Accounting Policy [Policy Text Block] Buildings and Improvements [Member] Building and Building Improvements [Member] Building Building [Member] Business Acquisition [Axis] Business Acquisition [Axis] Business Acquisition Acquiree [Domain] Business Acquisition Acquiree [Domain] Business acquisition, percentage of voting interest acquired Business acquisition, percentage of voting interest acquired Business Combinations Business Combinations Policy [Policy Text Block] Cash and cash equivalents Cash and Cash Equivalents, at Carrying Value 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 Net change in cash and cash equivalents Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Excluding Exchange Rate Effect Cash Equivalents Cash and Cash Equivalents, Policy [Policy Text Block] Certificates of Deposits [Member] Certificates of Deposit [Member] Class of Stock [Line Items] Class of Stock [Line Items] Class of Stock [Domain] Class of Stock [Domain] Commercial Paper [Member] Commercial Paper [Member] Commitments and Contingencies Disclosure [Abstract] Commitments and Contingencies [Abstract] Loss Contingencies Commitments and Contingencies, Policy [Policy Text Block] Commitments and contingencies - see Note 13 Commitments and Contingencies Commitments and Contingencies Commitments and Contingencies Disclosure [Text Block] Common Stock [Member] Common Stock [Member] Class A Convertible Common Stock [Member] Class A Common Stock [Member] Class A [Member] Dividends per common share (in dollars per share) Common Stock, Dividends, Per Share, Cash Paid Common stock, par value per share (in dollars per share) Common Stock, Par or Stated Value Per Share Common stock Common Stock, Value, Issued Common stock ($0.01 par value) Common stock, shares issued (in shares) Common Stock, Shares, Issued Common stock, shares authorized (in shares) Common Stock, Shares Authorized Common Stock Shares Outstanding Common stock outstanding (shares) Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest Less: Comprehensive loss attributable to the noncontrolling interest Less: Comprehensive loss attributable to the noncontrolling interest Comprehensive income (loss) Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest Comprehensive income (loss) Comprehensive income (loss) attributable to Cal-Maine Foods, Inc. Comprehensive Income (Loss), Net of Tax, Attributable to Parent Concentration Risk By Type[Axis] Concentration Risk By Type[Axis] Concentration Risk Type [Domain] Concentration Risk Type [Domain] Concentration Risk Benchmark [Domain] Concentration Risk Benchmark [Domain] Concentration risk, percentage Concentration Risk, Percentage Concentration Risk, Percentage Concentration Risk Benchmark [Axis] Concentration Risk Benchmark [Axis] Principles of Consolidation Consolidation, Policy [Policy Text Block] Corporate Bonds [Member] Corporate Debt Securities [Member] Cost of sales Cost of Goods and Services Sold Credit Facility [Domain] Credit Facility [Domain] Credit Facility [Axis] Credit Facility [Axis] Customer Concentration Risk [Member] Customer Concentration Risk [Member] Disaggregation of Revenue Disaggregation of Revenue [Table Text Block] Disaggregation of Revenue [Line Items] Disaggregation of Revenue [Line Items] Disaggregation of Revenue [Table] Disaggregation of Revenue [Table] Debt Securities Available For Sale Allowance For Credit Loss Allowance for credit losses Schedule of Available-for-sale Securities [Table] Schedule of Available-for-sale Securities [Table] Amount borrowed Long-term Debt, Gross Outstanding Debt Instrument [Axis] Debt Instrument [Axis] Debt Instrument, Name [Domain] Debt Instrument, Name [Domain] Deferred income taxes, net Deferred Income Tax Liabilities, Net Deferred income taxes Deferred Income Tax Expense (Benefit) Deferred income taxes Deferred income taxes expense (benefit): Total Depreciation and amortization Depreciation, Depletion and Amortization Denominator Dilutive Securities, Effect on Basic Earnings Per Share [Abstract] Stock Based Compensation Share-based Payment Arrangement [Text Block] Disclosure of Compensation Related Costs, Share-based Payments [Abstract] Stock Based Compensation [Abstract] Dividends Payable Amount Per Share Dividends payable per share Schedule of Dividends Dividends Declared [Table Text Block] Dividends Dividends Dividends Payable Current Dividends payable Net Income (Loss) per Common Share Earnings Per Share, Policy [Policy Text Block] Basic (in dollars per share) Earnings Per Share, Basic Diluted (in dollars per share) Earnings Per Share, Diluted Net Income (Loss) per Common Share Earnings Per Share [Text Block] Net income (loss) per common share: Net Income (Loss) per Common Share [Abstract] Effective Income Tax Rate Reconciliation, Percent Effective tax rate, percent Unrecognized compensation expense