Significant Accounting Policies (Schedule Of Computations Of Earnings Per Share) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended								12 Months Ended
	Jun. 03, 2017	Feb. 25, 2017	Nov. 26, 2016	Aug. 27, 2016	May 28, 2016	Feb. 27, 2016	Nov. 28, 2015	Aug. 29, 2015	Jun. 03, 2017	May 28, 2016	May 30, 2015
Accounting Policies [Abstract]
Net income (loss) attributable to Cal-Maine Foods, Inc.	$ (24,471)	$ 4,139	$ (23,010)	$ (30,936)	$ (376)	$ 64,164	$ 109,230	$ 143,023	$ (74,278)	$ 316,041	$ 161,254
Basic weighted-average common shares (including Class A) (in shares)									48,362	48,195	48,136
Effect of dilutive securities:
Common stock options and restricted stock (in shares)									0	170	301
Dilutive potential common shares (in shares)									48,362	48,365	48,437
Net income (loss) per common share:
Basic (in dollars per share)	$ (0.51)	$ 0.09	$ (0.48)	$ (0.64)	$ (0.01)	$ 1.33	$ 2.27	$ 2.97	$ (1.54)	$ 6.56	$ 3.35
Diluted (in dollars per share)	$ (0.51)	$ 0.09	$ (0.48)	$ (0.64)	$ (0.01)	$ 1.33	$ 2.26	$ 2.95	$ (1.54)	$ 6.53	$ 3.33