Document And Entity Information	Jun. 21, 2022
Document Information [Line Items]
Entity, Registrant Name	J&J SNACK FOODS CORP.
Current Fiscal Year End Date	--09-25
Document, Type	8-K
Document, Period End Date	Jun. 21, 2022
Entity, Incorporation, State or Country Code	NJ
Entity, File Number	000-14616
Entity, Tax Identification Number	22-1935537
Entity, Address, Address Line One	6000 Central Highway
Entity, Address, City or Town	Pennsauken
Entity, Address, State or Province	NJ
Entity, Address, Postal Zip Code	08109
City Area Code	856
Local Phone Number	665-9533
Written Communications	false
Soliciting Material	false
Pre-commencement Tender Offer	false
Pre-commencement Issuer Tender Offer	false
Title of 12(b) Security	Common Stock
Trading Symbol	JJSF
Security Exchange Name	NASDAQ
Entity, Emerging Growth Company	false
Amendment Flag	false
Entity, Central Index Key	0000785956