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Document and Entity Information - USD ($)
 12 Months Ended
Jun. 28, 2018
Aug. 15, 2018
Dec. 28, 2017
Document Information [Line Items]      
Document Type 10-K    
Amendment Flag false    
Document Period End Date Jun. 28, 2018    
Document Fiscal Year Focus 2018    
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 --06-28    
Entity Well-known Seasoned Issuer No    
Entity Current Reporting Status Yes    
Entity Voluntary Filers No    
Entity Filer Category Accelerated Filer    
Entity Public Float     $ 541,234,022
Common Stock, Non-Cumulative Voting Rights of One Vote Per Share [Member]      
Document Information [Line Items]      
Entity Common Stock, Shares Outstanding   8,747,575  
Class A Common Stock [Member]      
Document Information [Line Items]      
Entity Common Stock, Shares Outstanding   2,597,426