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Note 10 (Details) - Goodwill by Reporting Segment (USD $)
In Thousands, unless otherwise specified
Mar. 28, 2015
Sep. 27, 2014
Goodwill [Line Items]    
Balance $ 86,442us-gaap_GoodwillGross $ 86,442us-gaap_GoodwillGross
Food Service [Member]    
Goodwill [Line Items]    
Balance 46,832us-gaap_GoodwillGross
/ us-gaap_StatementBusinessSegmentsAxis
= jjsf_FoodServiceMember		 46,832us-gaap_GoodwillGross
/ us-gaap_StatementBusinessSegmentsAxis
= jjsf_FoodServiceMember
Retail Supermarket [Member]    
Goodwill [Line Items]    
Balance 3,670us-gaap_GoodwillGross
/ us-gaap_StatementBusinessSegmentsAxis
= jjsf_RetailSupermarketMember		 3,670us-gaap_GoodwillGross
/ us-gaap_StatementBusinessSegmentsAxis
= jjsf_RetailSupermarketMember
Frozen Beverages [Member]    
Goodwill [Line Items]    
Balance $ 35,940us-gaap_GoodwillGross
/ us-gaap_StatementBusinessSegmentsAxis
= jjsf_FrozenBeveragesMember		 $ 35,940us-gaap_GoodwillGross
/ us-gaap_StatementBusinessSegmentsAxis
= jjsf_FrozenBeveragesMember