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Note 9 (Details) - Reportable Segments Operations Information (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Mar. 28, 2015
Mar. 29, 2014
Mar. 28, 2015
Mar. 29, 2014
Sep. 27, 2014
Segment Reporting Information [Line Items]          
Revenues $ 225,008us-gaap_Revenues $ 205,321us-gaap_Revenues $ 437,760us-gaap_Revenues $ 408,844us-gaap_Revenues  
Depreciation and Amortization:          
Depreciation and Amortization 9,441us-gaap_DepreciationDepletionAndAmortization 9,162us-gaap_DepreciationDepletionAndAmortization 18,856us-gaap_DepreciationDepletionAndAmortization 18,102us-gaap_DepreciationDepletionAndAmortization  
Operating Income:          
Operating Income 21,805us-gaap_OperatingIncomeLoss 20,332us-gaap_OperatingIncomeLoss 38,415us-gaap_OperatingIncomeLoss 38,303us-gaap_OperatingIncomeLoss  
Capital Expenditures:          
Capital Expenditures 9,788us-gaap_PropertyPlantAndEquipmentAdditions 11,508us-gaap_PropertyPlantAndEquipmentAdditions 20,643us-gaap_PropertyPlantAndEquipmentAdditions 20,825us-gaap_PropertyPlantAndEquipmentAdditions  
Assets:          
Assets 709,313us-gaap_Assets 665,994us-gaap_Assets 709,313us-gaap_Assets 665,994us-gaap_Assets 704,773us-gaap_Assets
Food Service [Member] | Soft Pretzels [Member]          
Segment Reporting Information [Line Items]          
Revenues 41,099us-gaap_Revenues
/ us-gaap_ProductOrServiceAxis
= jjsf_SoftPretzelsMember
/ us-gaap_StatementBusinessSegmentsAxis
= jjsf_FoodServiceMember
38,815us-gaap_Revenues
/ us-gaap_ProductOrServiceAxis
= jjsf_SoftPretzelsMember
/ us-gaap_StatementBusinessSegmentsAxis
= jjsf_FoodServiceMember
81,817us-gaap_Revenues
/ us-gaap_ProductOrServiceAxis
= jjsf_SoftPretzelsMember
/ us-gaap_StatementBusinessSegmentsAxis
= jjsf_FoodServiceMember
78,123us-gaap_Revenues
/ us-gaap_ProductOrServiceAxis
= jjsf_SoftPretzelsMember
/ us-gaap_StatementBusinessSegmentsAxis
= jjsf_FoodServiceMember
 
Food Service [Member] | Frozen Juices and Ices [Member]          
Segment Reporting Information [Line Items]          
Revenues 11,072us-gaap_Revenues
/ us-gaap_ProductOrServiceAxis
= jjsf_FrozenJuicesAndIcesMember
/ us-gaap_StatementBusinessSegmentsAxis
= jjsf_FoodServiceMember
11,857us-gaap_Revenues
/ us-gaap_ProductOrServiceAxis
= jjsf_FrozenJuicesAndIcesMember
/ us-gaap_StatementBusinessSegmentsAxis
= jjsf_FoodServiceMember
19,273us-gaap_Revenues
/ us-gaap_ProductOrServiceAxis
= jjsf_FrozenJuicesAndIcesMember
/ us-gaap_StatementBusinessSegmentsAxis
= jjsf_FoodServiceMember
20,086us-gaap_Revenues
/ us-gaap_ProductOrServiceAxis
= jjsf_FrozenJuicesAndIcesMember
/ us-gaap_StatementBusinessSegmentsAxis
= jjsf_FoodServiceMember
 
Food Service [Member] | Churros [Member]          
Segment Reporting Information [Line Items]          
Revenues 14,622us-gaap_Revenues
/ us-gaap_ProductOrServiceAxis
= jjsf_ChurrosMember
/ us-gaap_StatementBusinessSegmentsAxis
= jjsf_FoodServiceMember
13,430us-gaap_Revenues
/ us-gaap_ProductOrServiceAxis
= jjsf_ChurrosMember
/ us-gaap_StatementBusinessSegmentsAxis
= jjsf_FoodServiceMember
27,589us-gaap_Revenues
/ us-gaap_ProductOrServiceAxis
= jjsf_ChurrosMember
/ us-gaap_StatementBusinessSegmentsAxis
= jjsf_FoodServiceMember
27,381us-gaap_Revenues
/ us-gaap_ProductOrServiceAxis
= jjsf_ChurrosMember
/ us-gaap_StatementBusinessSegmentsAxis
= jjsf_FoodServiceMember
 
Food Service [Member] | Handhelds [Member]          
Segment Reporting Information [Line Items]          
Revenues 5,044us-gaap_Revenues
/ us-gaap_ProductOrServiceAxis
= jjsf_HandheldsMember
/ us-gaap_StatementBusinessSegmentsAxis
= jjsf_FoodServiceMember
5,712us-gaap_Revenues
/ us-gaap_ProductOrServiceAxis
= jjsf_HandheldsMember
/ us-gaap_StatementBusinessSegmentsAxis
= jjsf_FoodServiceMember
10,202us-gaap_Revenues
/ us-gaap_ProductOrServiceAxis
= jjsf_HandheldsMember
/ us-gaap_StatementBusinessSegmentsAxis
= jjsf_FoodServiceMember
12,116us-gaap_Revenues
/ us-gaap_ProductOrServiceAxis
= jjsf_HandheldsMember
/ us-gaap_StatementBusinessSegmentsAxis
= jjsf_FoodServiceMember
 
Food Service [Member] | Bakery [Member]          
Segment Reporting Information [Line Items]          
Revenues 70,791us-gaap_Revenues
/ us-gaap_ProductOrServiceAxis
= jjsf_BakeryMember
/ us-gaap_StatementBusinessSegmentsAxis
= jjsf_FoodServiceMember
66,169us-gaap_Revenues
/ us-gaap_ProductOrServiceAxis
= jjsf_BakeryMember
/ us-gaap_StatementBusinessSegmentsAxis
= jjsf_FoodServiceMember
145,222us-gaap_Revenues
/ us-gaap_ProductOrServiceAxis
= jjsf_BakeryMember
/ us-gaap_StatementBusinessSegmentsAxis
= jjsf_FoodServiceMember
135,245us-gaap_Revenues
/ us-gaap_ProductOrServiceAxis
= jjsf_BakeryMember
/ us-gaap_StatementBusinessSegmentsAxis
= jjsf_FoodServiceMember
 
Food Service [Member] | Other [Member]          
Segment Reporting Information [Line Items]          
Revenues 2,634us-gaap_Revenues
/ us-gaap_ProductOrServiceAxis
= jjsf_OtherProductsMember
/ us-gaap_StatementBusinessSegmentsAxis
= jjsf_FoodServiceMember
2,346us-gaap_Revenues
/ us-gaap_ProductOrServiceAxis
= jjsf_OtherProductsMember
/ us-gaap_StatementBusinessSegmentsAxis
= jjsf_FoodServiceMember
4,720us-gaap_Revenues
/ us-gaap_ProductOrServiceAxis
= jjsf_OtherProductsMember
/ us-gaap_StatementBusinessSegmentsAxis
= jjsf_FoodServiceMember
4,158us-gaap_Revenues
/ us-gaap_ProductOrServiceAxis
= jjsf_OtherProductsMember
/ us-gaap_StatementBusinessSegmentsAxis
= jjsf_FoodServiceMember
 
Food Service [Member]          
Segment Reporting Information [Line Items]          
Revenues 145,262us-gaap_Revenues
/ us-gaap_StatementBusinessSegmentsAxis
= jjsf_FoodServiceMember
138,329us-gaap_Revenues
/ us-gaap_StatementBusinessSegmentsAxis
= jjsf_FoodServiceMember
288,823us-gaap_Revenues
/ us-gaap_StatementBusinessSegmentsAxis
= jjsf_FoodServiceMember
277,109us-gaap_Revenues
/ us-gaap_StatementBusinessSegmentsAxis
= jjsf_FoodServiceMember
 
Depreciation and Amortization:          
Depreciation and Amortization 5,388us-gaap_DepreciationDepletionAndAmortization
/ us-gaap_StatementBusinessSegmentsAxis
= jjsf_FoodServiceMember
5,233us-gaap_DepreciationDepletionAndAmortization
/ us-gaap_StatementBusinessSegmentsAxis
= jjsf_FoodServiceMember
10,641us-gaap_DepreciationDepletionAndAmortization
/ us-gaap_StatementBusinessSegmentsAxis
= jjsf_FoodServiceMember
10,372us-gaap_DepreciationDepletionAndAmortization
/ us-gaap_StatementBusinessSegmentsAxis
= jjsf_FoodServiceMember
 
Operating Income:          
Operating Income 15,649us-gaap_OperatingIncomeLoss
/ us-gaap_StatementBusinessSegmentsAxis
= jjsf_FoodServiceMember
17,562us-gaap_OperatingIncomeLoss
/ us-gaap_StatementBusinessSegmentsAxis
= jjsf_FoodServiceMember
31,142us-gaap_OperatingIncomeLoss
/ us-gaap_StatementBusinessSegmentsAxis
= jjsf_FoodServiceMember
32,713us-gaap_OperatingIncomeLoss
/ us-gaap_StatementBusinessSegmentsAxis
= jjsf_FoodServiceMember
 
Capital Expenditures:          
Capital Expenditures 4,656us-gaap_PropertyPlantAndEquipmentAdditions
/ us-gaap_StatementBusinessSegmentsAxis
= jjsf_FoodServiceMember
4,991us-gaap_PropertyPlantAndEquipmentAdditions
/ us-gaap_StatementBusinessSegmentsAxis
= jjsf_FoodServiceMember
10,812us-gaap_PropertyPlantAndEquipmentAdditions
/ us-gaap_StatementBusinessSegmentsAxis
= jjsf_FoodServiceMember
10,839us-gaap_PropertyPlantAndEquipmentAdditions
/ us-gaap_StatementBusinessSegmentsAxis
= jjsf_FoodServiceMember
 
Assets:          
Assets 532,773us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= jjsf_FoodServiceMember
505,745us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= jjsf_FoodServiceMember
532,773us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= jjsf_FoodServiceMember
505,745us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= jjsf_FoodServiceMember
 
Retail Supermarket [Member] | Soft Pretzels [Member]          
Segment Reporting Information [Line Items]          
Revenues 10,829us-gaap_Revenues
/ us-gaap_ProductOrServiceAxis
= jjsf_SoftPretzelsMember
/ us-gaap_StatementBusinessSegmentsAxis
= jjsf_RetailSupermarketMember
10,309us-gaap_Revenues
/ us-gaap_ProductOrServiceAxis
= jjsf_SoftPretzelsMember
/ us-gaap_StatementBusinessSegmentsAxis
= jjsf_RetailSupermarketMember
20,029us-gaap_Revenues
/ us-gaap_ProductOrServiceAxis
= jjsf_SoftPretzelsMember
/ us-gaap_StatementBusinessSegmentsAxis
= jjsf_RetailSupermarketMember
19,224us-gaap_Revenues
/ us-gaap_ProductOrServiceAxis
= jjsf_SoftPretzelsMember
/ us-gaap_StatementBusinessSegmentsAxis
= jjsf_RetailSupermarketMember
 
Retail Supermarket [Member] | Frozen Juices and Ices [Member]          
Segment Reporting Information [Line Items]          
Revenues 13,722us-gaap_Revenues
/ us-gaap_ProductOrServiceAxis
= jjsf_FrozenJuicesAndIcesMember
/ us-gaap_StatementBusinessSegmentsAxis
= jjsf_RetailSupermarketMember
8,402us-gaap_Revenues
/ us-gaap_ProductOrServiceAxis
= jjsf_FrozenJuicesAndIcesMember
/ us-gaap_StatementBusinessSegmentsAxis
= jjsf_RetailSupermarketMember
22,877us-gaap_Revenues
/ us-gaap_ProductOrServiceAxis
= jjsf_FrozenJuicesAndIcesMember
/ us-gaap_StatementBusinessSegmentsAxis
= jjsf_RetailSupermarketMember
14,825us-gaap_Revenues
/ us-gaap_ProductOrServiceAxis
= jjsf_FrozenJuicesAndIcesMember
/ us-gaap_StatementBusinessSegmentsAxis
= jjsf_RetailSupermarketMember
 
Retail Supermarket [Member] | Handhelds [Member]          
Segment Reporting Information [Line Items]          
Revenues 4,569us-gaap_Revenues
/ us-gaap_ProductOrServiceAxis
= jjsf_HandheldsMember
/ us-gaap_StatementBusinessSegmentsAxis
= jjsf_RetailSupermarketMember
4,815us-gaap_Revenues
/ us-gaap_ProductOrServiceAxis
= jjsf_HandheldsMember
/ us-gaap_StatementBusinessSegmentsAxis
= jjsf_RetailSupermarketMember
9,448us-gaap_Revenues
/ us-gaap_ProductOrServiceAxis
= jjsf_HandheldsMember
/ us-gaap_StatementBusinessSegmentsAxis
= jjsf_RetailSupermarketMember
10,102us-gaap_Revenues
/ us-gaap_ProductOrServiceAxis
= jjsf_HandheldsMember
/ us-gaap_StatementBusinessSegmentsAxis
= jjsf_RetailSupermarketMember
 
Retail Supermarket [Member] | Other [Member]          
Segment Reporting Information [Line Items]          
Revenues 340us-gaap_Revenues
/ us-gaap_ProductOrServiceAxis
= jjsf_OtherProductsMember
/ us-gaap_StatementBusinessSegmentsAxis
= jjsf_RetailSupermarketMember
213us-gaap_Revenues
/ us-gaap_ProductOrServiceAxis
= jjsf_OtherProductsMember
/ us-gaap_StatementBusinessSegmentsAxis
= jjsf_RetailSupermarketMember
566us-gaap_Revenues
/ us-gaap_ProductOrServiceAxis
= jjsf_OtherProductsMember
/ us-gaap_StatementBusinessSegmentsAxis
= jjsf_RetailSupermarketMember
432us-gaap_Revenues
/ us-gaap_ProductOrServiceAxis
= jjsf_OtherProductsMember
/ us-gaap_StatementBusinessSegmentsAxis
= jjsf_RetailSupermarketMember
 
Retail Supermarket [Member] | Coupon Redemption [Member]          
Segment Reporting Information [Line Items]          
Revenues (927)us-gaap_Revenues
/ us-gaap_ProductOrServiceAxis
= jjsf_CouponRedemptionMember
/ us-gaap_StatementBusinessSegmentsAxis
= jjsf_RetailSupermarketMember
(689)us-gaap_Revenues
/ us-gaap_ProductOrServiceAxis
= jjsf_CouponRedemptionMember
/ us-gaap_StatementBusinessSegmentsAxis
= jjsf_RetailSupermarketMember
(2,000)us-gaap_Revenues
/ us-gaap_ProductOrServiceAxis
= jjsf_CouponRedemptionMember
/ us-gaap_StatementBusinessSegmentsAxis
= jjsf_RetailSupermarketMember
(1,369)us-gaap_Revenues
/ us-gaap_ProductOrServiceAxis
= jjsf_CouponRedemptionMember
/ us-gaap_StatementBusinessSegmentsAxis
= jjsf_RetailSupermarketMember
 
Retail Supermarket [Member]          
Segment Reporting Information [Line Items]          
Revenues 28,533us-gaap_Revenues
/ us-gaap_StatementBusinessSegmentsAxis
= jjsf_RetailSupermarketMember
23,050us-gaap_Revenues
/ us-gaap_StatementBusinessSegmentsAxis
= jjsf_RetailSupermarketMember
50,920us-gaap_Revenues
/ us-gaap_StatementBusinessSegmentsAxis
= jjsf_RetailSupermarketMember
43,214us-gaap_Revenues
/ us-gaap_StatementBusinessSegmentsAxis
= jjsf_RetailSupermarketMember
 
Depreciation and Amortization:          
Depreciation and Amortization 187us-gaap_DepreciationDepletionAndAmortization
/ us-gaap_StatementBusinessSegmentsAxis
= jjsf_RetailSupermarketMember
8us-gaap_DepreciationDepletionAndAmortization
/ us-gaap_StatementBusinessSegmentsAxis
= jjsf_RetailSupermarketMember
440us-gaap_DepreciationDepletionAndAmortization
/ us-gaap_StatementBusinessSegmentsAxis
= jjsf_RetailSupermarketMember
16us-gaap_DepreciationDepletionAndAmortization
/ us-gaap_StatementBusinessSegmentsAxis
= jjsf_RetailSupermarketMember
 
Operating Income:          
Operating Income 2,535us-gaap_OperatingIncomeLoss
/ us-gaap_StatementBusinessSegmentsAxis
= jjsf_RetailSupermarketMember
2,602us-gaap_OperatingIncomeLoss
/ us-gaap_StatementBusinessSegmentsAxis
= jjsf_RetailSupermarketMember
3,201us-gaap_OperatingIncomeLoss
/ us-gaap_StatementBusinessSegmentsAxis
= jjsf_RetailSupermarketMember
4,566us-gaap_OperatingIncomeLoss
/ us-gaap_StatementBusinessSegmentsAxis
= jjsf_RetailSupermarketMember
 
Assets:          
Assets 14,452us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= jjsf_RetailSupermarketMember
6,051us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= jjsf_RetailSupermarketMember
14,452us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= jjsf_RetailSupermarketMember
6,051us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= jjsf_RetailSupermarketMember
 
Frozen Beverages [Member] | Other [Member]          
Segment Reporting Information [Line Items]          
Revenues 384us-gaap_Revenues
/ us-gaap_ProductOrServiceAxis
= jjsf_OtherProductsMember
/ us-gaap_StatementBusinessSegmentsAxis
= jjsf_FrozenBeveragesMember
335us-gaap_Revenues
/ us-gaap_ProductOrServiceAxis
= jjsf_OtherProductsMember
/ us-gaap_StatementBusinessSegmentsAxis
= jjsf_FrozenBeveragesMember
621us-gaap_Revenues
/ us-gaap_ProductOrServiceAxis
= jjsf_OtherProductsMember
/ us-gaap_StatementBusinessSegmentsAxis
= jjsf_FrozenBeveragesMember
593us-gaap_Revenues
/ us-gaap_ProductOrServiceAxis
= jjsf_OtherProductsMember
/ us-gaap_StatementBusinessSegmentsAxis
= jjsf_FrozenBeveragesMember
 
Frozen Beverages [Member] | Beverages [Member]          
Segment Reporting Information [Line Items]          
Revenues 28,778us-gaap_Revenues
/ us-gaap_ProductOrServiceAxis
= jjsf_BeveragesMember
/ us-gaap_StatementBusinessSegmentsAxis
= jjsf_FrozenBeveragesMember
26,713us-gaap_Revenues
/ us-gaap_ProductOrServiceAxis
= jjsf_BeveragesMember
/ us-gaap_StatementBusinessSegmentsAxis
= jjsf_FrozenBeveragesMember
54,288us-gaap_Revenues
/ us-gaap_ProductOrServiceAxis
= jjsf_BeveragesMember
/ us-gaap_StatementBusinessSegmentsAxis
= jjsf_FrozenBeveragesMember
51,902us-gaap_Revenues
/ us-gaap_ProductOrServiceAxis
= jjsf_BeveragesMember
/ us-gaap_StatementBusinessSegmentsAxis
= jjsf_FrozenBeveragesMember
 
Frozen Beverages [Member] | Repair and Maintenance Service [Member]          
Segment Reporting Information [Line Items]          
Revenues 15,723us-gaap_Revenues
/ us-gaap_ProductOrServiceAxis
= jjsf_RepairAndMaintenanceServiceMember
/ us-gaap_StatementBusinessSegmentsAxis
= jjsf_FrozenBeveragesMember
13,135us-gaap_Revenues
/ us-gaap_ProductOrServiceAxis
= jjsf_RepairAndMaintenanceServiceMember
/ us-gaap_StatementBusinessSegmentsAxis
= jjsf_FrozenBeveragesMember
31,033us-gaap_Revenues
/ us-gaap_ProductOrServiceAxis
= jjsf_RepairAndMaintenanceServiceMember
/ us-gaap_StatementBusinessSegmentsAxis
= jjsf_FrozenBeveragesMember
26,744us-gaap_Revenues
/ us-gaap_ProductOrServiceAxis
= jjsf_RepairAndMaintenanceServiceMember
/ us-gaap_StatementBusinessSegmentsAxis
= jjsf_FrozenBeveragesMember
 
Frozen Beverages [Member] | Machines Sales [Member]          
Segment Reporting Information [Line Items]          
Revenues 6,328us-gaap_Revenues
/ us-gaap_ProductOrServiceAxis
= jjsf_MachinesSalesMember
/ us-gaap_StatementBusinessSegmentsAxis
= jjsf_FrozenBeveragesMember
3,759us-gaap_Revenues
/ us-gaap_ProductOrServiceAxis
= jjsf_MachinesSalesMember
/ us-gaap_StatementBusinessSegmentsAxis
= jjsf_FrozenBeveragesMember
12,075us-gaap_Revenues
/ us-gaap_ProductOrServiceAxis
= jjsf_MachinesSalesMember
/ us-gaap_StatementBusinessSegmentsAxis
= jjsf_FrozenBeveragesMember
9,282us-gaap_Revenues
/ us-gaap_ProductOrServiceAxis
= jjsf_MachinesSalesMember
/ us-gaap_StatementBusinessSegmentsAxis
= jjsf_FrozenBeveragesMember
 
Frozen Beverages [Member]          
Segment Reporting Information [Line Items]          
Revenues 51,213us-gaap_Revenues
/ us-gaap_StatementBusinessSegmentsAxis
= jjsf_FrozenBeveragesMember
43,942us-gaap_Revenues
/ us-gaap_StatementBusinessSegmentsAxis
= jjsf_FrozenBeveragesMember
98,017us-gaap_Revenues
/ us-gaap_StatementBusinessSegmentsAxis
= jjsf_FrozenBeveragesMember
88,521us-gaap_Revenues
/ us-gaap_StatementBusinessSegmentsAxis
= jjsf_FrozenBeveragesMember
 
Depreciation and Amortization:          
Depreciation and Amortization 3,866us-gaap_DepreciationDepletionAndAmortization
/ us-gaap_StatementBusinessSegmentsAxis
= jjsf_FrozenBeveragesMember
3,921us-gaap_DepreciationDepletionAndAmortization
/ us-gaap_StatementBusinessSegmentsAxis
= jjsf_FrozenBeveragesMember
7,775us-gaap_DepreciationDepletionAndAmortization
/ us-gaap_StatementBusinessSegmentsAxis
= jjsf_FrozenBeveragesMember
7,714us-gaap_DepreciationDepletionAndAmortization
/ us-gaap_StatementBusinessSegmentsAxis
= jjsf_FrozenBeveragesMember
 
Operating Income:          
Operating Income 3,621us-gaap_OperatingIncomeLoss
/ us-gaap_StatementBusinessSegmentsAxis
= jjsf_FrozenBeveragesMember
168us-gaap_OperatingIncomeLoss
/ us-gaap_StatementBusinessSegmentsAxis
= jjsf_FrozenBeveragesMember
4,072us-gaap_OperatingIncomeLoss
/ us-gaap_StatementBusinessSegmentsAxis
= jjsf_FrozenBeveragesMember
1,024us-gaap_OperatingIncomeLoss
/ us-gaap_StatementBusinessSegmentsAxis
= jjsf_FrozenBeveragesMember
 
Capital Expenditures:          
Capital Expenditures 5,132us-gaap_PropertyPlantAndEquipmentAdditions
/ us-gaap_StatementBusinessSegmentsAxis
= jjsf_FrozenBeveragesMember
6,517us-gaap_PropertyPlantAndEquipmentAdditions
/ us-gaap_StatementBusinessSegmentsAxis
= jjsf_FrozenBeveragesMember
9,831us-gaap_PropertyPlantAndEquipmentAdditions
/ us-gaap_StatementBusinessSegmentsAxis
= jjsf_FrozenBeveragesMember
9,986us-gaap_PropertyPlantAndEquipmentAdditions
/ us-gaap_StatementBusinessSegmentsAxis
= jjsf_FrozenBeveragesMember
 
Assets:          
Assets $ 162,088us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= jjsf_FrozenBeveragesMember
$ 154,198us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= jjsf_FrozenBeveragesMember
$ 162,088us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= jjsf_FrozenBeveragesMember
$ 154,198us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= jjsf_FrozenBeveragesMember