Net Income (Loss) per Common Share (Computation of Basic and Diluted Net Income Per Share Attributable to the Company) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Feb. 27, 2021	Feb. 29, 2020	Feb. 27, 2021	Feb. 29, 2020
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Net income (loss)	$ 13,548	$ 13,771	$ 6,304	$ (42,136)
Less: Income (loss) attributable to noncontrolling interest	0	22	0	(64)
Net income (loss) attributable to Cal-Maine Foods, Inc.	$ 13,548	$ 13,749	$ 6,304	$ (42,072)
Weighted-average common shares outstanding, basic	48,530	48,473	48,511	48,455
Effect of dilutive restricted shares	129	115	138	0
Weighted-average common shares outstanding, diluted	48,659	48,588	48,649	48,455
Net income (loss) per common share attributable to Cal-Maine Foods, Inc.
Basic (in dollars per share)	$ 0.28	$ 0.28	$ 0.13	$ (0.87)
Diluted (in dollars per share)	$ 0.28	$ 0.28	$ 0.13	$ (0.87)