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Note 5 (Details) - Share-Based Compensation (USD $) In Thousands, except Per Share data, unless otherwise specified | 3 Months Ended | 6 Months Ended
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Mar. 28, 2015 | Mar. 29, 2014 | Mar. 28, 2015 | Mar. 29, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Allocated Share Based Compensation | $ 316 us-gaap_AllocatedShareBasedCompensationExpense | $ 440 us-gaap_AllocatedShareBasedCompensationExpense | $ 748 us-gaap_AllocatedShareBasedCompensationExpense | $ 885 us-gaap_AllocatedShareBasedCompensationExpense
Per diluted share (in Dollars per share) | $ 0.02 jjsf_ShareBasedCompensationPerDilutedShare | $ 0.02 jjsf_ShareBasedCompensationPerDilutedShare | $ 0.04 jjsf_ShareBasedCompensationPerDilutedShare | $ 0.05 jjsf_ShareBasedCompensationPerDilutedShare
The above compensation is net of tax benefits | 169 us-gaap_ExcessTaxBenefitFromShareBasedCompensationOperatingActivities | 85 us-gaap_ExcessTaxBenefitFromShareBasedCompensationOperatingActivities | 261 us-gaap_ExcessTaxBenefitFromShareBasedCompensationOperatingActivities | 164 us-gaap_ExcessTaxBenefitFromShareBasedCompensationOperatingActivities
Employee Stock Option [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Allocated Share Based Compensation | 264 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember | 388 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember | 548 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember | 700 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember
Stock Purchase Plan [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Allocated Share Based Compensation | 50 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = jjsf_StockPurchasePlanMember | 48 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = jjsf_StockPurchasePlanMember | 197 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = jjsf_StockPurchasePlanMember | 177 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = jjsf_StockPurchasePlanMember
Restricted Stock [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Allocated Share Based Compensation | $ 2 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember | $ 4 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember | $ 3 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember | $ 8 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember

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- Definition Represents share based compensation per diluted share. + References No definition available. + Details
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Balance Type: | na
Period Type: | duration

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- Definition Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 14.F) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 -Section F + Details
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- Definition Amount of cash outflow for realized tax benefit related to deductible compensation cost reported on the entity's tax return for equity instruments in excess of the compensation cost for those instruments recognized for financial reporting purposes. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 20 -Section 55 -Paragraph 24 -URI http://asc.fasb.org/extlink&oid=32706628&loc=d3e11374-113907 + Details
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