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. 25, 2017	Feb. 27, 2016	Feb. 25, 2017	Feb. 27, 2016	May 28, 2016
Dividends Payable [Line Items]
Net income (loss) attributable to Cal-Maine Foods, Inc.	$ 4,139	$ 64,164	$ (49,807)	$ 316,417
1/3 of net income attributable to Cal-Maine Foods, Inc. available for dividend	$ 0	$ 21,388	$ 0	$ 105,472
Percentage of net income attributable to parent			33.33%
Total common stock outstanding (shares)	48,577	48,538	48,577	48,538
Dividends per common share (in dollars per share)	$ 0.000	$ 0.441	$ 0.000	$ 2.175
Common Stock
Dividends Payable [Line Items]
Total common stock outstanding (shares)	43,777	43,738	43,777	43,738
Class A Common Stock
Dividends Payable [Line Items]
Total common stock outstanding (shares)	4,800	4,800	4,800	4,800	4,800