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Document and Entity Information
 6 Months Ended
Dec. 25, 2014
Jan. 21, 2015
Document Information [Line Items]    
Document Type 10-Q  
Amendment Flag false  
Document Period End Date Dec. 25, 2014  
Document Fiscal Year Focus 2015  
Document Fiscal Period Focus Q2  
Trading Symbol JBSS  
Entity Registrant Name SANFILIPPO JOHN B & SON INC  
Entity Central Index Key 0000880117  
Current Fiscal Year End Date --06-25  
Entity Filer Category Accelerated Filer  
Common Stock, Non-Cumulative Voting Rights of One Vote Per Share [Member]    
Document Information [Line Items]    
Entity Common Stock, Shares Outstanding   8,529,580dei_EntityCommonStockSharesOutstanding
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Class A Common Stock [Member]    
Document Information [Line Items]    
Entity Common Stock, Shares Outstanding   2,597,426dei_EntityCommonStockSharesOutstanding
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember