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Note 12 (Details) (USD $)
3 Months Ended 6 Months Ended 12 Months Ended 5 Months Ended 1 Months Ended
Mar. 28, 2015
Mar. 29, 2014
Mar. 28, 2015
Mar. 29, 2014
Sep. 27, 2014
Sep. 27, 2014
Oct. 31, 2013
May 31, 2014
Note 12 (Details) [Line Items]                
Goodwill, Acquired During Period $ 0us-gaap_GoodwillAcquiredDuringPeriod   $ 0us-gaap_GoodwillAcquiredDuringPeriod          
Revenues 225,008,000us-gaap_Revenues 205,321,000us-gaap_Revenues 437,760,000us-gaap_Revenues 408,844,000us-gaap_Revenues        
Food Service [Member] | New York Pretzel [Member]                
Note 12 (Details) [Line Items]                
Revenues         4,300,000us-gaap_Revenues
/ us-gaap_BusinessAcquisitionAxis
= jjsf_NewYorkPretzelMember
/ us-gaap_StatementBusinessSegmentsAxis
= jjsf_FoodServiceMember
     
Food Service [Member]                
Note 12 (Details) [Line Items]                
Revenues 145,262,000us-gaap_Revenues
/ us-gaap_StatementBusinessSegmentsAxis
= jjsf_FoodServiceMember
138,329,000us-gaap_Revenues
/ us-gaap_StatementBusinessSegmentsAxis
= jjsf_FoodServiceMember
288,823,000us-gaap_Revenues
/ us-gaap_StatementBusinessSegmentsAxis
= jjsf_FoodServiceMember
277,109,000us-gaap_Revenues
/ us-gaap_StatementBusinessSegmentsAxis
= jjsf_FoodServiceMember
       
Retail Supermarket [Member] | PHILLY SWIRL [Member]                
Note 12 (Details) [Line Items]                
Business Combination, Pro Forma Information, Revenue of Acquiree since Acquisition Date, Actual           12,600,000us-gaap_BusinessCombinationProFormaInformationRevenueOfAcquireeSinceAcquisitionDateActual
/ us-gaap_BusinessAcquisitionAxis
= jjsf_PHILLYSWIRLMember
/ us-gaap_StatementBusinessSegmentsAxis
= jjsf_RetailSupermarketMember
   
Retail Supermarket [Member]                
Note 12 (Details) [Line Items]                
Revenues 28,533,000us-gaap_Revenues
/ us-gaap_StatementBusinessSegmentsAxis
= jjsf_RetailSupermarketMember
23,050,000us-gaap_Revenues
/ us-gaap_StatementBusinessSegmentsAxis
= jjsf_RetailSupermarketMember
50,920,000us-gaap_Revenues
/ us-gaap_StatementBusinessSegmentsAxis
= jjsf_RetailSupermarketMember
43,214,000us-gaap_Revenues
/ us-gaap_StatementBusinessSegmentsAxis
= jjsf_RetailSupermarketMember
       
New York Pretzel [Member]                
Note 12 (Details) [Line Items]                
Business Combination, Consideration Transferred             11,800,000us-gaap_BusinessCombinationConsiderationTransferred1
/ us-gaap_BusinessAcquisitionAxis
= jjsf_NewYorkPretzelMember
 
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill             849,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill
/ us-gaap_BusinessAcquisitionAxis
= jjsf_NewYorkPretzelMember
 
Goodwill, Acquired During Period             7,716,000us-gaap_GoodwillAcquiredDuringPeriod
/ us-gaap_BusinessAcquisitionAxis
= jjsf_NewYorkPretzelMember
 
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment             3,049,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment
/ us-gaap_BusinessAcquisitionAxis
= jjsf_NewYorkPretzelMember
 
PHILLY SWIRL [Member]                
Note 12 (Details) [Line Items]                
Business Combination, Consideration Transferred               17,400,000us-gaap_BusinessCombinationConsiderationTransferred1
/ us-gaap_BusinessAcquisitionAxis
= jjsf_PHILLYSWIRLMember
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill               11,100,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill
/ us-gaap_BusinessAcquisitionAxis
= jjsf_PHILLYSWIRLMember
Goodwill, Acquired During Period               1,800,000us-gaap_GoodwillAcquiredDuringPeriod
/ us-gaap_BusinessAcquisitionAxis
= jjsf_PHILLYSWIRLMember
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment               1,200,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment
/ us-gaap_BusinessAcquisitionAxis
= jjsf_PHILLYSWIRLMember
Business Acquisition, Revenue Reported by Acquired Entity for Last Annual Period               25,000,000us-gaap_BusinessAcquisitionRevenueReportedByAcquiredEntityForLastAnnualPeriod
/ us-gaap_BusinessAcquisitionAxis
= jjsf_PHILLYSWIRLMember
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Working Capital Acquired               4,000,000jjsf_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedWorkingCapitalAcquired
/ us-gaap_BusinessAcquisitionAxis
= jjsf_PHILLYSWIRLMember
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deferred Tax Assets Noncurrent               4,000,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredTaxAssetsNoncurrent
/ us-gaap_BusinessAcquisitionAxis
= jjsf_PHILLYSWIRLMember
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Other Noncurrent Assets               95,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherNoncurrentAssets
/ us-gaap_BusinessAcquisitionAxis
= jjsf_PHILLYSWIRLMember
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deferred Tax Liabilities Noncurrent               $ 4,800,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredTaxLiabilitiesNoncurrent
/ us-gaap_BusinessAcquisitionAxis
= jjsf_PHILLYSWIRLMember