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Document And Entity Information (USD $)
 12 Months Ended
Sep. 24, 2011
Nov. 25, 2011
Mar. 25, 2011
Document and Entity Information [Abstract]      
Entity Registrant Name J&J SNACK FOODS CORP    
Document Type 10-K    
Current Fiscal Year End Date --09-24    
Entity Common Stock, Shares Outstanding   18,734,376  
Entity Public Float     $ 674,816,674
Amendment Flag false    
Entity Central Index Key 0000785956    
Entity Current Reporting Status Yes    
Entity Voluntary Filers No    
Entity Filer Category Accelerated Filer    
Entity Well-known Seasoned Issuer No    
Document Period End Date Sep. 24, 2011    
Document Fiscal Year Focus 2011    
Document Fiscal Period Focus FY