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Note 10 (Details) - Intangible Assets by Reporting Segment (USD $) In Thousands, unless otherwise specified | Dec. 27, 2014 | Sep. 27, 2014
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Amortized intangible assets |  |
Accumulated Amortization | $ 41,370 us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization | $ 40,015 us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
Gross Carrying Amount | 91,004 us-gaap_IntangibleAssetsGrossExcludingGoodwill | 91,004 us-gaap_IntangibleAssetsGrossExcludingGoodwill
Trade Names [Member] | Food Service [Member] |  |
Indefinite lived intangible assets |  |
Gross Carrying Amount | 13,072 us-gaap_IndefiniteLivedTradeNames / us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TradeNamesMember / us-gaap_StatementBusinessSegmentsAxis = jjsf_FoodServiceMember | 13,072 us-gaap_IndefiniteLivedTradeNames / us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TradeNamesMember / us-gaap_StatementBusinessSegmentsAxis = jjsf_FoodServiceMember
Trade Names [Member] | Retail Supermarket [Member] |  |
Indefinite lived intangible assets |  |
Gross Carrying Amount | 7,206 us-gaap_IndefiniteLivedTradeNames / us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TradeNamesMember / us-gaap_StatementBusinessSegmentsAxis = jjsf_RetailSupermarketMember | 7,206 us-gaap_IndefiniteLivedTradeNames / us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TradeNamesMember / us-gaap_StatementBusinessSegmentsAxis = jjsf_RetailSupermarketMember
Trade Names [Member] | Frozen Beverages [Member] |  |
Indefinite lived intangible assets |  |
Gross Carrying Amount | 9,315 us-gaap_IndefiniteLivedTradeNames / us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TradeNamesMember / us-gaap_StatementBusinessSegmentsAxis = jjsf_FrozenBeveragesMember | 9,315 us-gaap_IndefiniteLivedTradeNames / us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TradeNamesMember / us-gaap_StatementBusinessSegmentsAxis = jjsf_FrozenBeveragesMember
Food Service [Member] | Noncompete Agreements [Member] |  |
Amortized intangible assets |  |
Gross Carrying Amount | 592 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_NoncompeteAgreementsMember / us-gaap_StatementBusinessSegmentsAxis = jjsf_FoodServiceMember | 592 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_NoncompeteAgreementsMember / us-gaap_StatementBusinessSegmentsAxis = jjsf_FoodServiceMember
Accumulated Amortization | 517 us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_NoncompeteAgreementsMember / us-gaap_StatementBusinessSegmentsAxis = jjsf_FoodServiceMember | 509 us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_NoncompeteAgreementsMember / us-gaap_StatementBusinessSegmentsAxis = jjsf_FoodServiceMember
Food Service [Member] | Customer Relationships [Member] |  |
Amortized intangible assets |  |
Gross Carrying Amount | 40,797 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember / us-gaap_StatementBusinessSegmentsAxis = jjsf_FoodServiceMember | 40,797 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember / us-gaap_StatementBusinessSegmentsAxis = jjsf_FoodServiceMember
Accumulated Amortization | 30,846 us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember / us-gaap_StatementBusinessSegmentsAxis = jjsf_FoodServiceMember | 29,914 us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember / us-gaap_StatementBusinessSegmentsAxis = jjsf_FoodServiceMember
Food Service [Member] | License and Rights [Member] |  |
Amortized intangible assets |  |
Gross Carrying Amount | 3,606 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = jjsf_LicenseAndRightsMember / us-gaap_StatementBusinessSegmentsAxis = jjsf_FoodServiceMember | 3,606 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = jjsf_LicenseAndRightsMember / us-gaap_StatementBusinessSegmentsAxis = jjsf_FoodServiceMember
Accumulated Amortization | 2,732 us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = jjsf_LicenseAndRightsMember / us-gaap_StatementBusinessSegmentsAxis = jjsf_FoodServiceMember | 2,708 us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = jjsf_LicenseAndRightsMember / us-gaap_StatementBusinessSegmentsAxis = jjsf_FoodServiceMember
Food Service [Member] |  |
Amortized intangible assets |  |
Accumulated Amortization | 34,095 us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_StatementBusinessSegmentsAxis = jjsf_FoodServiceMember | 33,131 us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_StatementBusinessSegmentsAxis = jjsf_FoodServiceMember
Gross Carrying Amount | 58,067 us-gaap_IntangibleAssetsGrossExcludingGoodwill / us-gaap_StatementBusinessSegmentsAxis = jjsf_FoodServiceMember | 58,067 us-gaap_IntangibleAssetsGrossExcludingGoodwill / us-gaap_StatementBusinessSegmentsAxis = jjsf_FoodServiceMember
Retail Supermarket [Member] | Noncompete Agreements [Member] |  |
Amortized intangible assets |  |
Gross Carrying Amount | 160 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_NoncompeteAgreementsMember / us-gaap_StatementBusinessSegmentsAxis = jjsf_RetailSupermarketMember | 160 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_NoncompeteAgreementsMember / us-gaap_StatementBusinessSegmentsAxis = jjsf_RetailSupermarketMember
Accumulated Amortization | 54 us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_NoncompeteAgreementsMember / us-gaap_StatementBusinessSegmentsAxis = jjsf_RetailSupermarketMember | 34 us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_NoncompeteAgreementsMember / us-gaap_StatementBusinessSegmentsAxis = jjsf_RetailSupermarketMember
Retail Supermarket [Member] | Customer Relationships [Member] |  |
Amortized intangible assets |  |
Gross Carrying Amount | 7,979 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember / us-gaap_StatementBusinessSegmentsAxis = jjsf_RetailSupermarketMember | 7,979 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember / us-gaap_StatementBusinessSegmentsAxis = jjsf_RetailSupermarketMember
Accumulated Amortization | 619 us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember / us-gaap_StatementBusinessSegmentsAxis = jjsf_RetailSupermarketMember | 420 us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember / us-gaap_StatementBusinessSegmentsAxis = jjsf_RetailSupermarketMember
Retail Supermarket [Member] |  |
Amortized intangible assets |  |
Accumulated Amortization | 673 us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_StatementBusinessSegmentsAxis = jjsf_RetailSupermarketMember | 454 us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_StatementBusinessSegmentsAxis = jjsf_RetailSupermarketMember
Gross Carrying Amount | 15,345 us-gaap_IntangibleAssetsGrossExcludingGoodwill / us-gaap_StatementBusinessSegmentsAxis = jjsf_RetailSupermarketMember | 15,345 us-gaap_IntangibleAssetsGrossExcludingGoodwill / us-gaap_StatementBusinessSegmentsAxis = jjsf_RetailSupermarketMember
Frozen Beverages [Member] | Noncompete Agreements [Member] |  |
Amortized intangible assets |  |
Gross Carrying Amount | 198 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_NoncompeteAgreementsMember / us-gaap_StatementBusinessSegmentsAxis = jjsf_FrozenBeveragesMember | 198 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_NoncompeteAgreementsMember / us-gaap_StatementBusinessSegmentsAxis = jjsf_FrozenBeveragesMember
Accumulated Amortization | 198 us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_NoncompeteAgreementsMember / us-gaap_StatementBusinessSegmentsAxis = jjsf_FrozenBeveragesMember | 198 us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_NoncompeteAgreementsMember / us-gaap_StatementBusinessSegmentsAxis = jjsf_FrozenBeveragesMember
Frozen Beverages [Member] | Customer Relationships [Member] |  |
Amortized intangible assets |  |
Gross Carrying Amount | 6,478 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember / us-gaap_StatementBusinessSegmentsAxis = jjsf_FrozenBeveragesMember | 6,478 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember / us-gaap_StatementBusinessSegmentsAxis = jjsf_FrozenBeveragesMember
Accumulated Amortization | 5,602 us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember / us-gaap_StatementBusinessSegmentsAxis = jjsf_FrozenBeveragesMember | 5,448 us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CustomerRelationshipsMember / us-gaap_StatementBusinessSegmentsAxis = jjsf_FrozenBeveragesMember
Frozen Beverages [Member] | License and Rights [Member] |  |
Amortized intangible assets |  |
Gross Carrying Amount | 1,601 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = jjsf_LicenseAndRightsMember / us-gaap_StatementBusinessSegmentsAxis = jjsf_FrozenBeveragesMember | 1,601 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = jjsf_LicenseAndRightsMember / us-gaap_StatementBusinessSegmentsAxis = jjsf_FrozenBeveragesMember
Accumulated Amortization | 802 us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = jjsf_LicenseAndRightsMember / us-gaap_StatementBusinessSegmentsAxis = jjsf_FrozenBeveragesMember | 784 us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = jjsf_LicenseAndRightsMember / us-gaap_StatementBusinessSegmentsAxis = jjsf_FrozenBeveragesMember
Frozen Beverages [Member] |  |
Amortized intangible assets |  |
Accumulated Amortization | 6,602 us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_StatementBusinessSegmentsAxis = jjsf_FrozenBeveragesMember | 6,430 us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_StatementBusinessSegmentsAxis = jjsf_FrozenBeveragesMember
Gross Carrying Amount | $ 17,592 us-gaap_IntangibleAssetsGrossExcludingGoodwill / us-gaap_StatementBusinessSegmentsAxis = jjsf_FrozenBeveragesMember | $ 17,592 us-gaap_IntangibleAssetsGrossExcludingGoodwill / us-gaap_StatementBusinessSegmentsAxis = jjsf_FrozenBeveragesMember

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- Definition Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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- Definition Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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- Definition Carrying amount (original costs adjusted for previously recognized amortization and impairment) as of the balance sheet date for the rights acquired through registration of a trade name to gain or protect exclusive use thereof for a projected indefinite period of benefit. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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