Accrued Dividends Payable And Dividends per Common Share (Schedule Of Dividends Per Common Share) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Nov. 26, 2016	Nov. 28, 2015	Nov. 26, 2016	Nov. 28, 2015	May 28, 2016
Dividends Payable [Line Items]
Net income (loss) attributable to Cal-Maine Foods, Inc. available for dividend	$ (23,010)	$ 109,230	$ (53,946)	$ 252,253
1/3 of net income attributable to Cal-Maine Foods, Inc.	$ 0	$ 36,410	$ 0	$ 84,084
Percentage of net income attributable to parent	33.33%
Total common stock outstanding (shares)	48,530,000	48,495,000	48,530,000	48,495,000
Dividends per common share (in dollars per share)	$ 0.000	$ 0.751	$ 0.000	$ 1.734
Common Stock
Dividends Payable [Line Items]
Total common stock outstanding (shares)	43,730,000	43,695,000	43,730,000	43,695,000	43,737,000
Class A Common Stock
Dividends Payable [Line Items]
Total common stock outstanding (shares)	4,800,000	4,800,000	4,800,000	4,800,000	4,800,000