Condensed Consolidated Statements of Comprehensive Income (Loss) (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Nov. 28, 2020	Nov. 30, 2019	Nov. 28, 2020	Nov. 30, 2019
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ 12,155	$ (10,186)	$ (7,244)	$ (55,907)
Other comprehensive income (loss), before tax:
Unrealized holding gain (loss) on available-for-sale securities, net of reclassification adjustments	(373)	(241)	95	(825)
(Increase) decrease in accumulated post-retirement benefits obligation, net of reclassification adjustments	(91)	(59)	23	(201)
Income tax (benefit) expense related to items of other comprehensive income	(282)	(182)	72	(624)
Other comprehensive income (loss), net of  tax	11,873	(10,368)	(7,172)	(56,531)
Comprehensive income (loss)	0	(125)	0	(86)
Less: Comprehensive loss attributable to the noncontrolling interest	$ 11,873	$ (10,243)	$ (7,172)	$ (56,445)
Basic (in dollars per share)	$ 0.25	$ (0.21)	$ (0.15)	$ (1.15)
Basic (in shares)	48,501	48,447	48,501	48,447
Diluted (in shares)	48,645	48,447	48,501	48,447
Net sales	$ 347,328	$ 311,522	$ 640,110	$ 552,688
Cost of sales	288,877	282,147	564,894	544,438
Gross Profit	58,451	29,375	75,216	8,250
Selling, general and administrative	43,873	45,728	87,838	88,203
Loss on disposal of fixed assets	99	212	122	82
Operating Income (Loss)	14,479	(16,565)	(12,744)	(80,035)
Interest income, net	664	1,140	1,589	2,825
Royalty income	280	348	585	759
Equity income (loss) of unconsolidated entities	58	(454)	14	(908)
Other, net	436	482	948	1,818
Nonoperating Income (Expense)	1,438	1,516	3,136	4,494
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest	15,917	(15,049)	(9,608)	(75,541)
Income tax (benefit) expense	3,762	(4,863)	(2,364)	(19,634)
Net income (loss)	12,155	(10,186)	(7,244)	(55,907)
Less: Loss attributable to noncontrolling interest	0	(125)	0	(86)
Net income (loss) attributable to Cal-Maine Foods, Inc.	$ 12,155	$ (10,061)	$ (7,244)	$ (55,821)
Diluted (in dollars per share)	$ 0.25	$ (0.21)	$ (0.15)	$ (1.15)