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Document and Entity Information
 6 Months Ended
Dec. 29, 2011
Feb. 01, 2012
Entity Registrant Name SANFILIPPO JOHN B & SON INC  
Entity Central Index Key 0000880117  
Document Type 10-Q  
Document Period End Date Dec. 29, 2011  
Amendment Flag false  
Document Fiscal Year Focus 2012  
Document Fiscal Period Focus Q2  
Current Fiscal Year End Date --06-28  
Entity Filer Category Accelerated Filer  
Entity Common Stock, Shares Outstanding   8,108,680
Class A Common stock
    
Entity Common Stock, Shares Outstanding   2,597,426