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
	May 28, 2016	Feb. 27, 2016	Nov. 28, 2015	Aug. 29, 2015	May 30, 2015	Feb. 28, 2015	Nov. 29, 2014	Aug. 30, 2014	May 28, 2016	May 30, 2015	May 31, 2014
Significant Accounting Policies [Abstract]
Net income attributable to Cal-Maine Foods, Inc.	$ (376)	$ 64,164	$ 109,230	$ 143,023	$ 46,114	$ 50,882	$ 36,603	$ 27,655	$ 316,041	$ 161,254	$ 109,207
Basic weighted-average common shares (including Class A)									48,195	48,136	48,095
Effect of dilutive securities: Common stock options and restricted stock									170	301	202
Dilutive potential common shares									48,365	48,437	48,297
Basic	$ (0.01)	$ 1.33	$ 2.27	$ 2.97	$ 0.96	$ 1.06	$ 0.76	$ 0.57	$ 6.56	$ 3.35	$ 2.27
Diluted	$ (0.01)	$ 1.33	$ 2.26	$ 2.95	$ 0.95	$ 1.05	$ 0.76	$ 0.57	$ 6.53	$ 3.33	$ 2.26