Document And Entity Information - shares	9 Months Ended
	Jun. 25, 2016	Jul. 20, 2016
Document Information [Line Items]
Entity Registrant Name	J&J SNACK FOODS CORP
Entity Central Index Key	0000785956
Trading Symbol	jjsf
Current Fiscal Year End Date	--09-24
Entity Filer Category	Large Accelerated Filer
Entity Current Reporting Status	Yes
Entity Voluntary Filers	No
Entity Well-known Seasoned Issuer	Yes
Entity Common Stock, Shares Outstanding (in shares)		18,657,757
Document Type	10-Q
Document Period End Date	Jun. 25, 2016
Document Fiscal Year Focus	2016
Document Fiscal Period Focus	Q3
Amendment Flag	false