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Document And Entity Information (USD $)
 12 Months Ended
Sep. 29, 2012
Nov. 16, 2012
Mar. 23, 2012
Document and Entity Information [Abstract]      
Entity Registrant Name J&J SNACK FOODS CORP    
Document Type 10-K    
Current Fiscal Year End Date --09-29    
Entity Common Stock, Shares Outstanding   18,749,353  
Entity Public Float     $ 764,966,763
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. 29, 2012    
Document Fiscal Year Focus 2012    
Document Fiscal Period Focus FY