v3.26.1
Cover Page - USD ($)
 12 Months Ended
Jun. 25, 2026
Aug. 13, 2026
Dec. 25, 2025
Document Information [Line Items]      
Document Type 10-K    
Amendment Flag false    
Document Period End Date Jun. 25, 2026    
Document Fiscal Year Focus 2026    
Document Fiscal Period Focus FY    
Trading Symbol JBSS    
Entity Registrant Name SANFILIPPO JOHN B & SON INC    
Security Exchange Name NASDAQ    
Entity Interactive Data Current Yes    
Entity Central Index Key 0000880117    
Current Fiscal Year End Date --06-25    
Entity Well-known Seasoned Issuer Yes    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Shell Company false    
Entity Filer Category Large Accelerated Filer    
Entity Small Business false    
Entity Emerging Growth Company false    
Title of 12(b) Security Common Stock    
Entity Address, State or Province IL    
Entity Public Float     $ 646,700,554
Securities Act File Number 0-19681    
Entity Incorporation, State or Country Code DE    
Entity Tax Identification Number 36-2419677    
Entity Address, Address Line One 1703 North Randall Road    
Entity Address, City or Town Elgin    
Entity Address, Postal Zip Code 60123    
City Area Code 847    
Local Phone Number 289-1800    
Document Transition Report false    
Document Annual Report true    
ICFR Auditor Attestation Flag true    
Auditor Name PricewaterhouseCoopers LLP    
Auditor Firm ID 238    
Auditor Location Chicago, Illinois    
Auditor Opinion [Text Block]

Opinions on the Financial Statements and Internal Control over Financial Reporting

 

We have audited the accompanying consolidated balance sheets of John B. Sanfilippo & Son, Inc. and its subsidiaries (the “Company”) as of June 25, 2026 and June 26, 2025, and the related consolidated statements of comprehensive income, of stockholders' equity and of cash flows for each of the three years in the period ended June 25, 2026, including the related notes (collectively referred to as the “consolidated financial statements”). We also have audited the Company's internal control over financial reporting as of June 25, 2026, based on criteria established in Internal Control - Integrated Framework (2013) issued by the Committee of Sponsoring Organizations of the Treadway Commission (COSO).

 

In our opinion, the consolidated financial statements referred to above present fairly, in all material respects, the financial position of the Company as of June 25, 2026 and June 26, 2025, and the results of its operations and its cash flows for each of the three years in the period ended June 25, 2026 in conformity with accounting principles generally accepted in the United States of America. Also in our opinion, the Company maintained, in all material respects, effective internal control over financial reporting as of June 25, 2026, based on criteria established in Internal Control - Integrated Framework (2013) issued by the COSO.

    
Document Financial Statement Error Correction [Flag] false    
Documents Incorporated by Reference [Text Block]

Documents Incorporated by Reference:

Portions of the registrant’s definitive Proxy Statement for its Annual Meeting of Stockholders to be held October 28, 2026 are incorporated by reference into Part III of this Form 10-K.

    
Common Stock, Non-Cumulative Voting Rights of One Vote Per Share [Member]      
Document Information [Line Items]      
Entity Common Stock, Shares Outstanding   9,096,055  
Class A Common Stock [Member]      
Document Information [Line Items]      
Entity Common Stock, Shares Outstanding   2,597,426