Net Income 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, 2016	Feb. 28, 2015	Feb. 27, 2016	Feb. 28, 2015
Net Income Per Common Share [Abstract]
Net income attributable to Cal-Maine Foods, Inc.	$ 64,164	$ 50,882	$ 316,417	$ 115,140
Basic weighted-average common shares	48,204	48,137	48,177	48,134
Restricted shares	163	288	182	260
Common stock options		22		22
Dilutive potential common shares	48,367	48,447	48,359	48,416
Basic	$ 1.33	$ 1.06	$ 6.57	$ 2.39
Diluted	$ 1.33	$ 1.05	$ 6.54	$ 2.38