XML 17 R1.htm IDEA: XBRL DOCUMENT v3.24.3
Document And Entity Information - USD ($)
 12 Months Ended
Sep. 28, 2024
Nov. 22, 2024
Document Information [Line Items]    
Document Type 10-K  
Document Annual Report true  
Document Period End Date Sep. 28, 2024  
Document Transition Report false  
Entity File Number 000-14616  
City Area Code 856  
Local Phone Number 665-9533  
Entity Registrant Name J&J SNACK FOODS CORP  
Entity Incorporation, State or Country Code NJ  
Entity Tax Identification Number 22-1935537  
Entity Address, Address Line One 350 Fellowship Road  
Entity Address, City or Town Mt. Laurel  
Entity Address, State or Province NJ  
Entity Address, Postal Zip Code 08054  
Title of 12(b) Security Common Stock, no par value  
Trading Symbol JJSF  
Security Exchange Name NASDAQ  
Entity Well-known Seasoned Issuer Yes  
Entity Voluntary Filers No  
Entity Current Reporting Status Yes  
Entity Interactive Data Current Yes  
Entity Filer Category Large Accelerated Filer  
Entity Small Business false  
Entity Emerging Growth Company false  
ICFR Auditor Attestation Flag false  
Document Financial Statement Error Correction [Flag] false  
Entity Shell Company false  
Entity Public Float $ 2,177,643,456  
Entity Common Stock, Shares Outstanding (in shares)   19,478,439
Auditor Firm ID 248  
Auditor Name GRANT THORNTON LLP  
Auditor Location Philadelphia, Pennsylvania  
Entity Central Index Key 0000785956  
Current Fiscal Year End Date --09-28  
Document Fiscal Year Focus 2024  
Document Fiscal Period Focus FY  
Amendment Flag false