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Document And Entity Information
 3 Months Ended
Dec. 29, 2012
Jan. 21, 2013
Document and Entity Information [Abstract]    
Entity Registrant Name J&J SNACK FOODS CORP  
Document Type 10-Q  
Current Fiscal Year End Date --09-28  
Entity Common Stock, Shares Outstanding   18,797,826
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 Dec. 29, 2012  
Document Fiscal Year Focus 2013  
Document Fiscal Period Focus Q1