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Document and Entity Information (USD $)
12 Months Ended
Jun. 26, 2014
Dec. 26, 2013
Aug. 15, 2014
Common Stock, non-cumulative voting rights of one vote per share [Member]
Aug. 15, 2014
Class A Common Stock [Member]
Document Information [Line Items]        
Document Type 10-K      
Amendment Flag false      
Document Period End Date Jun. 26, 2014      
Document Fiscal Year Focus 2014      
Document Fiscal Period Focus FY      
Trading Symbol JBSS      
Entity Registrant Name SANFILIPPO JOHN B & SON INC      
Entity Central Index Key 0000880117      
Current Fiscal Year End Date --06-26      
Entity Well-known Seasoned Issuer No      
Entity Current Reporting Status Yes      
Entity Voluntary Filers No      
Entity Filer Category Accelerated Filer      
Entity Common Stock, Shares Outstanding     8,451,205 2,597,426
Entity Public Float   $ 207,307,458