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Accrued Dividends Payable And Dividends Per Common Share (Schedule Of Dividends Per Common Share) (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended 6 Months Ended
Nov. 29, 2014
Nov. 30, 2013
Jun. 01, 2013
Nov. 29, 2014
Nov. 30, 2013
May 31, 2014
Dividends Payable [Line Items]            
Net income attributable to Cal-Maine Foods, Inc. $ 36,603us-gaap_NetIncomeLoss $ 26,106us-gaap_NetIncomeLoss $ (3,833)us-gaap_NetIncomeLoss $ 64,258us-gaap_NetIncomeLoss $ 34,862us-gaap_NetIncomeLoss  
Net income available for dividend calculation 36,603calm_NetIncomeAvailableForDividendCalculation 26,106calm_NetIncomeAvailableForDividendCalculation   64,258calm_NetIncomeAvailableForDividendCalculation 31,029calm_NetIncomeAvailableForDividendCalculation  
1/3 of net income attributable to Cal-Maine Foods, Inc. available and accrued for dividend $ 12,201calm_OneThirdOfNetIncomeAttributableToParent $ 8,703calm_OneThirdOfNetIncomeAttributableToParent   $ 21,419calm_OneThirdOfNetIncomeAttributableToParent $ 10,343calm_OneThirdOfNetIncomeAttributableToParent  
Common stock outstanding (shares) 48,382,000us-gaap_CommonStockSharesOutstanding 48,217,000us-gaap_CommonStockSharesOutstanding   48,382,000us-gaap_CommonStockSharesOutstanding 48,217,000us-gaap_CommonStockSharesOutstanding  
Dividends per common share $ 0.252us-gaap_CommonStockDividendsPerShareDeclared [1] $ 0.180us-gaap_CommonStockDividendsPerShareDeclared [1]   $ 0.443us-gaap_CommonStockDividendsPerShareDeclared [1] $ 0.214us-gaap_CommonStockDividendsPerShareDeclared [1]  
Percentage of net income attributable to Cal-Maine Foods, Inc.       33.33%calm_PercentageOfNetIncomeAttributableToParent    
Common Stock [Member]            
Dividends Payable [Line Items]            
Common stock outstanding (shares) 43,582,000us-gaap_CommonStockSharesOutstanding
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonStockMember		 43,417,000us-gaap_CommonStockSharesOutstanding
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonStockMember		   43,582,000us-gaap_CommonStockSharesOutstanding
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonStockMember		 43,417,000us-gaap_CommonStockSharesOutstanding
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonStockMember		 43,562,000us-gaap_CommonStockSharesOutstanding
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonStockMember
Class A Common Stock [Member]            
Dividends Payable [Line Items]            
Common stock outstanding (shares) 4,800,000us-gaap_CommonStockSharesOutstanding
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember		 4,800,000us-gaap_CommonStockSharesOutstanding
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember		   4,800,000us-gaap_CommonStockSharesOutstanding
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember		 4,800,000us-gaap_CommonStockSharesOutstanding
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember		 4,800,000us-gaap_CommonStockSharesOutstanding
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
[1] Dividends per common share = 1/3 of Net income (loss) attributable to Cal-Maine Foods, Inc. available for dividend ÷ Total common stock outstanding (shares). Per share amounts for the thirteen and twenty-six weeks ended November 29, 2014, are estimated based on outstanding shares as of the end of the period; actual per share amounts will be determined as of the dividend record date.