Quarterly Financial Data (Schedule of Quarterly Financial Data) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	May 30, 2020	Feb. 29, 2020	Nov. 30, 2019	Aug. 31, 2019	Jun. 01, 2019	Mar. 02, 2019	Dec. 01, 2018	Sep. 01, 2018	May 30, 2020	Jun. 01, 2019	Jun. 02, 2018
Quarterly Financial Information Disclosure [Abstract]
Net sales	$ 453,333	$ 345,588	$ 311,522	$ 241,166	$ 280,572	$ 383,993	$ 356,040	$ 340,583	$ 1,351,609	$ 1,361,188	$ 1,502,932
Gross profit (loss)	121,510	49,828	29,375	(21,125)	12,755	82,441	70,535	57,128	179,588	222,859	361,046
Net income attributable to Cal-Maine Foods, Inc.	$ 60,463	$ 13,749	$ (10,061)	$ (45,760)	$ (19,761)	$ 39,777	$ 21,807	$ 12,406	$ 18,391	$ 54,229	$ 125,932
Earnings Per Share [Abstract]
Basic (in dollars per share)	$ 1.25	$ 0.28	$ (0.21)	$ (0.94)	$ (0.41)	$ 0.82	$ 0.45	$ 0.26	$ 0.38	$ 1.12	$ 2.60
Diluted (in dollars per share)	$ 1.24	$ 0.28	$ (0.21)	$ (0.94)	$ (0.41)	$ 0.82	$ 0.45	$ 0.26	$ 0.38	$ 1.12	$ 2.60
Operating income	$ 76,092	$ 5,212	$ (16,565)	$ (63,470)	$ (30,420)	$ 38,190	$ 25,334	$ 12,677	$ 1,269	$ 45,781	$ 100,507
Net income	$ 60,464	$ 13,771	$ (10,186)	$ (45,721)	$ (19,552)	$ 39,865	$ 22,006	$ 12,743	$ 18,328	$ 55,062	$ 126,196