Document And Entity Information (USD $)	12 Months Ended
	Sep. 28, 2013	Nov. 15, 2013	Mar. 29, 2013
Document and Entity Information [Abstract]
Entity Registrant Name	J&J SNACK FOODS CORP
Document Type	10-K
Current Fiscal Year End Date	--09-28
Entity Common Stock, Shares Outstanding		18,678,012
Entity Public Float			$ 1,142,800,154
Amendment Flag	false
Entity Central Index Key	0000785956
Entity Current Reporting Status	Yes
Entity Voluntary Filers	No
Entity Filer Category	Large Accelerated Filer
Entity Well-known Seasoned Issuer	Yes
Document Period End Date	Sep. 28, 2013
Document Fiscal Year Focus	2013
Document Fiscal Period Focus	FY