Net Loss per Common Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Aug. 29, 2020	Aug. 31, 2019
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Net loss	$ (19,399)	$ (45,721)
Less: Income attributable to noncontrolling interest	0	39
Net loss attributable to Cal-Maine Foods, Inc.	$ (19,399)	$ (45,760)
Basic weighted-average common shares (in shares)	48,501	48,446
Dilutive potential common shares (in shares)	48,501	48,446
Net income (loss) per common share attributable to Cal-Maine Foods, Inc.
Basic (in dollars per share)	$ (0.40)	$ (0.94)
Diluted (in dollars per share)	$ (0.40)	$ (0.94)
Restricted Shares
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive restricted securities excluded from diluted net loss per share calculation (in shares)	139	110