XML 16 R1.htm IDEA: XBRL DOCUMENT v3.19.2
Document and Entity Information - USD ($)
 12 Months Ended
Jun. 27, 2019
Aug. 15, 2019
Dec. 27, 2018
Document Information [Line Items]      
Document Type 10-K    
Amendment Flag false    
Document Period End Date Jun. 27, 2019    
Document Fiscal Year Focus 2019    
Document Fiscal Period Focus FY    
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 --06-27    
Entity Well-known Seasoned Issuer No    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Shell Company false    
Entity Filer Category Accelerated Filer    
Entity Small Business false    
Entity Emerging Growth Company false    
Entity Public Float     $ 481,295,450
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   8,791,506  
Class A Common Stock [Member]      
Document Information [Line Items]      
Entity Common Stock, Shares Outstanding   2,597,426