| Cover | Jul. 20, 2020 |
| Cover [Abstract] | |
| Document Type | 8-K |
| Document Period End Date | Jul. 20, 2020 |
| Entity Registrant Name | Cal-Maine Foods, Inc. |
| Entity Incorporation, State or Country Code | DE |
| Entity File Number | 001-38695 |
| Entity Tax Identification Number | 64-0500378 |
| Entity Address, Address Line One | 3320 W Woodrow Wilson Ave |
| Entity Address, City or Town | Jackson |
| Entity Address, State or Province | MS |
| Entity Address, Postal Zip Code | 39209-3409 |
| City Area Code | 601 |
| Local Phone Number | 948-6813 |
| Title of 12(b) Security | Common Stock, $0.01 par value per share |
| Trading Symbol | CALM |
| Security Exchange Name | NASDAQ |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Entity Emerging Growth Company | false |
| Entity Central Index Key | 0000016160 |
| Amendment Flag | false |
