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Document And Entity Information - USD ($)
 12 Months Ended
Sep. 26, 2015
Nov. 05, 2015
Mar. 27, 2015
Document and Entity Information [Abstract]      
Entity Registrant Name J&J SNACK FOODS CORP    
Trading Symbol jjsf    
Document Type 10-K    
Current Fiscal Year End Date --09-26    
Entity Common Stock, Shares Outstanding   18,686,025  
Entity Public Float     $ 1,624,968,709
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. 26, 2015    
Document Fiscal Year Focus 2015    
Document Fiscal Period Focus FY