Cover Page - shares	6 Months Ended
	Nov. 28, 2020	Jan. 05, 2021
Document Information [Line Items]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Nov. 28, 2020
Document Transition Report	false
Entity File Number	000-38695
Entity Registrant Name	CAL-MAINE FOODS, INC
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	64-0500378
Local Phone Number	948-6813
City Area Code	601
Entity Address, Postal Zip Code	39209
Entity Address, State or Province	MS
Entity Address, City or Town	Jackson
Entity Address, Address Line One	3320 Woodrow Wilson Avenue
Title of 12(b) Security	Common Stock, $0.01 par value per share
Trading Symbol	CALM
Security Exchange Name	NASDAQ
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Document Fiscal Year Focus	2021
Document Fiscal Period Focus	FY
Amendment Flag	false
Entity Central Index Key	0000016160
Current Fiscal Year End Date	--05-29
Common Stock
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		43,968,231
Class A Common Stock
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		4,800,000