Net Income (Loss) per Common Share (Computation of Basic and Diluted Net Income Per Share) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Nov. 27, 2021	Nov. 28, 2020	Nov. 27, 2021	Nov. 28, 2020
Net Income (Loss) per Common Share [Abstract]
Net income (loss)	$ 1,145	$ 12,155	$ (16,881)	$ (7,244)
Less: Loss attributable to noncontrolling interest	(28)	0	(28)	0
Net income (loss) attributable to Cal-Maine Foods, Inc.	$ 1,173	$ 12,155	$ (16,853)	$ (7,244)
Denominator
Weighted-average common shares outstanding, basic (in shares)	48,857	48,501	48,859	48,501
Effect of dilutive restricted shares (in shares)	159	144
Weighted-average common shares outstanding, diluted (in shares)	49,016	48,645	48,859	48,501
Net income per common share attributable to Cal-Maine Foods, Inc.
Basic (in dollars per share)	$ 0.02	$ 0.25	$ (0.34)	$ (0.15)
Diluted (in dollars per share)	$ 0.02	$ 0.25	$ (0.34)	$ (0.15)