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. 29, 2020	Aug. 31, 2019
Class of Stock [Line Items]
Net loss attributable to Cal-Maine Foods, Inc.	$ (19,399)	$ (45,760)
Cumulative losses to be recovered prior to payment of divided at beginning of period	(1,370)	(19,761)
Net loss attributable to Cal-Maine Foods, Inc.	$ 0	$ 0
Common stock, shares outstanding (in shares)	48,772
Dividends per common share (in dollars per share)	$ 0
Common Stock
Class of Stock [Line Items]
One third of net income attributable to parent	$ 0
Common stock, shares outstanding (in shares)	43,972
Class A Common Stock
Class of Stock [Line Items]
Common stock, shares outstanding (in shares)	4,800