Document and Entity Information	9 Months Ended
	Mar. 29, 2012	May 01, 2012
Entity Registrant Name	SANFILIPPO JOHN B & SON INC
Entity Central Index Key	0000880117
Document Type	10-Q
Document Period End Date	Mar. 29, 2012
Amendment Flag	false
Document Fiscal Year Focus	2012
Document Fiscal Period Focus	Q3
Current Fiscal Year End Date	--06-28
Entity Filer Category	Accelerated Filer
Entity Common Stock, Shares Outstanding		8,121,180
Common Class A [Member]
Entity Common Stock, Shares Outstanding		2,597,426