Net Income 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		9 Months Ended
	Feb. 26, 2022	Feb. 27, 2021	Feb. 26, 2022	Feb. 27, 2021
Net Income per Common Share [Abstract]
Net income	$ 39,454	$ 13,548	$ 22,573	$ 6,304
Less: Loss attributable to noncontrolling interest	(63)	0	(91)	0
Net income attributable to Cal-Maine Foods, Inc.	$ 39,517	$ 13,548	$ 22,664	$ 6,304
Denominator
Weighted-average common shares outstanding, basic (in shares)	48,886	48,530	48,888	48,511
Effect of dilutive restricted shares (in shares)	150	129	147	138
Weighted-average common shares outstanding, diluted (in shares)	49,036	48,659	49,035	48,649
Net income per common share attributable to Cal-Maine Foods, Inc.
Basic (in dollars per share)	$ 0.81	$ 0.28	$ 0.46	$ 0.13
Diluted (in dollars per share)	$ 0.81	$ 0.28	$ 0.46	$ 0.13