Cover - USD ($)	12 Months Ended
	May 30, 2020	Jul. 20, 2020	Nov. 30, 2019
Entity Interactive Data Current	Yes
Entity Shell Company	false
Entity Address, Address Line One	3320 Woodrow Wilson Ave
Entity Address, City or Town	Jackson
Entity Address, State or Province	MS
Entity Address, Postal Zip Code	39209
City Area Code	601
Local Phone Number	948-6813
Entity File Number	001-38695
Entity Tax Identification Number	64-0500378
Entity Incorporation, State or Country Code	DE
Document Type	10-K
Document Annual Report	true
Document Transition Report	false
Title of 12(b) Security	Common Stock, $0.01 par value per share
Trading Symbol	CALM
Security Exchange Name	NASDAQ
Amendment Flag	false
Document Period End Date	May 30, 2020
Document Fiscal Year Focus	2020
Document Fiscal Period Focus	FY
Entity Registrant Name	CAL-MAINE FOODS, INC.
Entity Central Index Key	0000016160
Current Fiscal Year End Date	--05-30
Entity Filer Category	Large Accelerated Filer
ICFR Auditor Attestation Flag	true
Entity Public Float			$ 1,372,892,856
Entity Current Reporting Status	Yes
Entity Voluntary Filers	No
Entity Well-known Seasoned Issuer	Yes
Documents Incorporated by Reference	The information called for by Part III of this Form 10-K is incorporated herein by reference from the registrant’s Definitive Proxy Statement for its 2020 annual meeting of stockholders which will be filed pursuant to Regulation 14A not later than 120 days after the end of the fiscal year covered by this report.
Entity Small Business	false
Entity Emerging Growth Company	false
Common Stock
Entity Common Stock, Shares Outstanding		43,500,718
Class A Convertible Common Stock
Entity Common Stock, Shares Outstanding		4,800,000