XML 18 R1.htm IDEA: XBRL DOCUMENT v3.19.3.a.u2
Cover Page - shares
 6 Months Ended
Dec. 26, 2019
Jan. 23, 2020
Document Information [Line Items]    
Document Type 10-Q  
Amendment Flag false  
Document Period End Date Dec. 26, 2019  
Document Fiscal Year Focus 2020  
Document Fiscal Period Focus Q2  
Trading Symbol JBSS  
Entity Registrant Name SANFILIPPO JOHN B & SON INC  
Security Exchange Name NASDAQ  
Entity Interactive Data Current Yes  
Entity Central Index Key 0000880117  
Current Fiscal Year End Date --06-25  
Entity Current Reporting Status Yes  
Entity Shell Company false  
Entity Filer Category Accelerated Filer  
Entity Small Business false  
Entity Emerging Growth Company false  
Title of 12(b) Security Common Stock  
Entity Address, State or Province IL  
Common Stock, Non-Cumulative Voting Rights of One Vote Per Share [Member]    
Document Information [Line Items]    
Entity Common Stock, Shares Outstanding   8,821,490
Class A Common Stock [Member]    
Document Information [Line Items]    
Entity Common Stock, Shares Outstanding   2,597,426