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Note 5 (Details) (USD $) In Millions, except Share data, unless otherwise specified | 3 Months Ended
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Dec. 27, 2014 | Dec. 28, 2013
Note 5 (Details) [Line Items] |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross | 0 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross | 97,975 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value |  | $ 15.21 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
Five Year Options [Member] |  |
Note 5 (Details) [Line Items] |  |
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Volatility Calculation, Term | 49 months |
Ten Year Options [Member] |  |
Note 5 (Details) [Line Items] |  |
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Volatility Calculation, Term | 10 years |
Scenario, Forecast [Member] |  |
Note 5 (Details) [Line Items] |  |
Anticipated Share Based Compensation Net Of Tax Benefits | 2.1 jjsf_AnticipatedShareBasedCompensationNetOfTaxBenefits / us-gaap_StatementScenarioAxis = us-gaap_ScenarioForecastMember |
Anticipated Share Based Compensation Per Share | 0.11 jjsf_AnticipatedShareBasedCompensationPerShare / us-gaap_StatementScenarioAxis = us-gaap_ScenarioForecastMember |

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- Definition Anticipated Share Based Compensation Net Of Tax Benefits + References No definition available. + Details
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- Definition Represents share-based compensation arrangement by share-based payment award, fair value assumptions, volatility calculation, term. + References No definition available. + Details
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- Definition Gross number of share options (or share units) granted during the period. + References No definition available. + Details
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- Definition The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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