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Document and Entity Information
 3 Months Ended
Sep. 25, 2014
Oct. 17, 2014
Common Stock, Non-Cumulative Voting Rights of One Vote Per Share [Member]
Oct. 17, 2014
Class A Common Stock [Member]
Document Information [Line Items]      
Document Type 10-Q    
Amendment Flag false    
Document Period End Date Sep. 25, 2014    
Document Fiscal Year Focus 2015    
Document Fiscal Period Focus Q1    
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    
Entity Common Stock, Shares Outstanding   8,468,705 2,597,426