Net Income (Loss) per Common Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Feb. 25, 2017	Feb. 27, 2016	Feb. 25, 2017	Feb. 27, 2016
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Net income (loss) attributable to Cal-Maine Foods, Inc.	$ 4,139	$ 64,164	$ (49,807)	$ 316,417
Basic weighted-average common shares (in shares)	48,286,000	48,204,000	48,285,000	48,177,000
Incremental Weighted Average Shares Attributable to Dilutive Effect [Abstract]
Restricted shares (in shares)	131,000	163,000	0	182,000
Dilutive potential common shares (in shares)	48,417,000	48,367,000	48,285,000	48,359,000
Earnings Per Share, Basic and Diluted [Abstract]
Basic (in dollars per share)	$ 0.09	$ 1.33	$ (1.03)	$ 6.57
Diluted (in dollars per share)	$ 0.09	$ 1.33	$ (1.03)	$ 6.54
Restricted Shares
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive shares excluded from calculation of earnings per share			145,044