Document And Entity Information
| Document And Entity Information | Oct. 03, 2019 |
| Document Information [Line Items] | |
| Entity Registrant Name | J&J SNACK FOODS CORP |
| Document Type | 8-K |
| Document Period End Date | Oct. 3, 2019 |
| Entity Incorporation, State or Country Code | NJ |
| Entity File Number | 0-14616 |
| Entity Tax Identification Number | 22-1935537 |
| Entity Address, Address Line One | 6000 Central Highway |
| Entity Address, City or Town | Pennsauken |
| Entity Address, State or Province | NJ |
| Entity Address, Postal Zip Code | 08109 |
| City Area Code | (856) |
| Local Phone Number | 665-9533 |
| Title of 12(b) Security | Common Stock |
| Trading Symbol | JJSF |
| Security Exchange Name | NASDAQ |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Entity Emerging Growth Company | false |
| Amendment Flag | false |
| Entity Central Index Key | 0000785956 |