Accrued Dividends Payable And Dividends per Common Share (Schedule of Dividends) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Aug. 31, 2019	Sep. 01, 2018	Jun. 01, 2019
Class of Stock [Line Items]
Net income (loss) attributable to Cal-Maine Foods, Inc.	$ (45,760)	$ 12,405
Net Income (Loss) Available to Common Stockholders, Basic	(45,760)	12,405
One third of net income attributable to parent	$ 0	$ 4,135
Common stock, shares outstanding (in shares)	48,693	48,631
Dividends per common share (in dollars per share)	$ 0	$ 0.085
Common Stock
Class of Stock [Line Items]
Common stock, shares outstanding (in shares)	43,893	43,831
Class A Common Stock
Class of Stock [Line Items]
Common stock, shares outstanding (in shares)	4,800	4,800	4,800