Accrued Dividends Payable And Dividends Per Common Share (Schedule Of Dividends Per Common Share) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Feb. 27, 2016	Feb. 28, 2015	Feb. 27, 2016	Feb. 28, 2015	May. 30, 2015
Dividends Payable [Line Items]
Net income attributable to Cal-Maine Foods, Inc. available for dividend	$ 64,164	$ 50,882	$ 316,417	$ 115,140
1/3 of net income attributable to Cal-Maine Foods, Inc.	$ 21,388	$ 16,961	$ 105,472	$ 38,380
Common stock outstanding (shares)	48,538	48,472	48,538	48,472
Dividends per common share	$ 0.441	$ 0.350	$ 2.175	$ 0.793
Percentage of net income attributable to Cal-Maine Foods, Inc.			33.33%
Common Stock [Member]
Dividends Payable [Line Items]
Common stock outstanding (shares)	43,738	43,672	43,738	43,672	43,698
Class A Common Stock [Member]
Dividends Payable [Line Items]
Common stock outstanding (shares)	4,800	4,800	4,800	4,800	4,800