XML 12 R1.htm IDEA: XBRL DOCUMENT v3.19.1
Document and Entity Information - shares
 9 Months Ended
Mar. 28, 2019
Apr. 24, 2019
Document Information [Line Items]    
Document Type 10-Q  
Amendment Flag false  
Document Period End Date Mar. 28, 2019  
Document Fiscal Year Focus 2019  
Document Fiscal Period Focus Q3  
Trading Symbol JBSS  
Entity Registrant Name SANFILIPPO JOHN B & SON INC  
Entity Central Index Key 0000880117  
Current Fiscal Year End Date --06-27  
Entity Filer Category Accelerated Filer  
Entity Small Business false  
Entity Emerging Growth Company false  
Common Stock, Non-Cumulative Voting Rights of One Vote Per Share [Member]    
Document Information [Line Items]    
Entity Common Stock, Shares Outstanding   8,791,506
Class A Common Stock [Member]    
Document Information [Line Items]    
Entity Common Stock, Shares Outstanding   2,597,426