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
	Aug. 27, 2016	Aug. 29, 2015	May 28, 2016
Dividends Payable [Line Items]
Net income (loss) attributable to Cal-Maine Foods, Inc. available for dividend	$ (30,936)	$ 143,023
1/3 of net income attributable to Cal-Maine Foods, Inc.		$ 47,674
Common stock outstanding (shares)	48,533	48,498
Dividends per common share		$ 0.983
Percentage of net income attributable to Cal-Maine Foods, Inc.	33.33%
Common Stock [Member]
Dividends Payable [Line Items]
Common stock outstanding (shares)	43,733	43,698	43,737
Class A Common Stock [Member]
Dividends Payable [Line Items]
Common stock outstanding (shares)	4,800	4,800	4,800