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Document And Entity Information
 3 Months Ended
Dec. 27, 2014
Jan. 21, 2015
Document and Entity Information [Abstract]    
Entity Registrant Name J&J SNACK FOODS CORP  
Document Type 10-Q  
Current Fiscal Year End Date --09-27  
Entity Common Stock, Shares Outstanding   18,688,487dei_EntityCommonStockSharesOutstanding
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. 27, 2014  
Document Fiscal Year Focus 2015  
Document Fiscal Period Focus Q1