| Document And Entity Information | Nov. 02, 2023 |
| Cover [Abstract] | |
| Document Type | 8-K/A |
| Amendment Flag | true |
| Amendment Description | This Current Report on Form 8-K/A (this “Amendment”) is being filed as an amendment to the Current Report on Form 8-K filed by John B. Sanfilippo & Son, Inc. (the “Company”) with the Securities and Exchange Commission (the “SEC”) on November 6, 2023 (the “November Form 8-K”). The November Form 8-K reported the results of the matters submitted to a vote at the Company's Annual Meeting of Stockholders held on November 2, 2023 (the “Annual Meeting”). The sole purpose of this Amendment is to update disclosures made under Item 5.07, Submission of Matters to a Vote of Security Holders, in the November Form 8-K. Except as set forth herein, no other amendments, supplements or modifications have been made to the November Form 8-K. |
| Document Period End Date | Nov. 02, 2023 |
| Entity Registrant Name | SANFILIPPO JOHN B & SON INC |
| Entity Central Index Key | 0000880117 |
| Entity Emerging Growth Company | false |
| Entity File Number | 0-19681 |
| Entity Incorporation, State or Country Code | DE |
| Entity Tax Identification Number | 36-2419677 |
| Entity Address, Address Line One | 1703 N. RANDALL ROAD |
| Entity Address, City or Town | Elgin |
| Entity Address, State or Province | IL |
| Entity Address, Postal Zip Code | 60123-7820 |
| City Area Code | (847) |
| Local Phone Number | 289-1800 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Title of 12(b) Security | Common Stock, $.01 par value per share |
| Trading Symbol | JBSS |
| Security Exchange Name | NASDAQ |
