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Note 11 (Details) - Summary of Securities (USD $) In Thousands, unless otherwise specified | 6 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 28, 2015 | Sep. 27, 2014
Note 11 (Details) - Summary of Securities [Line Items] |  |
Amortized cost - available for sale | $ 130,499 us-gaap_AvailableForSaleSecuritiesAmortizedCost | $ 129,473 us-gaap_AvailableForSaleSecuritiesAmortizedCost
Gross unrealized gains - available for sale | 403 us-gaap_AvailableForSaleSecuritiesGrossUnrealizedGains | 760 us-gaap_AvailableForSaleSecuritiesGrossUnrealizedGains
Gross unrealized losses - available for sale | 3,148 us-gaap_AvailableForSaleSecuritiesGrossUnrealizedLoss | 2,116 us-gaap_AvailableForSaleSecuritiesGrossUnrealizedLoss
Fair market value - available for sale | 127,754 us-gaap_AvailableForSaleSecurities | 128,117 us-gaap_AvailableForSaleSecurities
Amortized cost - held to maturity |  | 2,000 us-gaap_HeldToMaturitySecuritiesAmortizedCostBeforeOtherThanTemporaryImpairment
Gross unrealized gains - held to maturity |  | 0 us-gaap_HeldToMaturitySecuritiesUnrecognizedHoldingGains
Gross unrealized losses - held to maturity |  | 13 us-gaap_HeldToMaturitySecuritiesUnrecognizedHoldingLosses
Fair market value - held to maturity |  | 1,987 us-gaap_HeldToMaturitySecuritiesFairValue
US Government Corporations and Agencies Securities [Member] |  |
Note 11 (Details) - Summary of Securities [Line Items] |  |
Amortized cost - available for sale | 117,366 us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_InvestmentTypeAxis = us-gaap_USGovernmentCorporationsAndAgenciesSecuritiesMember |
Gross unrealized gains - available for sale | 298 us-gaap_AvailableForSaleSecuritiesGrossUnrealizedGains / us-gaap_InvestmentTypeAxis = us-gaap_USGovernmentCorporationsAndAgenciesSecuritiesMember |
Gross unrealized losses - available for sale | 3,130 us-gaap_AvailableForSaleSecuritiesGrossUnrealizedLoss / us-gaap_InvestmentTypeAxis = us-gaap_USGovernmentCorporationsAndAgenciesSecuritiesMember |
Fair market value - available for sale | 114,534 us-gaap_AvailableForSaleSecurities / us-gaap_InvestmentTypeAxis = us-gaap_USGovernmentCorporationsAndAgenciesSecuritiesMember |
Amortized cost - held to maturity |  | 2,000 us-gaap_HeldToMaturitySecuritiesAmortizedCostBeforeOtherThanTemporaryImpairment / us-gaap_InvestmentTypeAxis = us-gaap_USGovernmentCorporationsAndAgenciesSecuritiesMember
Gross unrealized gains - held to maturity |  | 0 us-gaap_HeldToMaturitySecuritiesUnrecognizedHoldingGains / us-gaap_InvestmentTypeAxis = us-gaap_USGovernmentCorporationsAndAgenciesSecuritiesMember
Gross unrealized losses - held to maturity |  | 13 us-gaap_HeldToMaturitySecuritiesUnrecognizedHoldingLosses / us-gaap_InvestmentTypeAxis = us-gaap_USGovernmentCorporationsAndAgenciesSecuritiesMember
Fair market value - held to maturity |  | 1,987 us-gaap_HeldToMaturitySecuritiesFairValue / us-gaap_InvestmentTypeAxis = us-gaap_USGovernmentCorporationsAndAgenciesSecuritiesMember
Preferred Stock [Member] |  |
Note 11 (Details) - Summary of Securities [Line Items] |  |
Amortized cost - available for sale | 13,133 us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_InvestmentTypeAxis = us-gaap_PreferredStockMember |
Gross unrealized gains - available for sale | 105 us-gaap_AvailableForSaleSecuritiesGrossUnrealizedGains / us-gaap_InvestmentTypeAxis = us-gaap_PreferredStockMember |
Gross unrealized losses - available for sale | 18 us-gaap_AvailableForSaleSecuritiesGrossUnrealizedLoss / us-gaap_InvestmentTypeAxis = us-gaap_PreferredStockMember |
Fair market value - available for sale | 13,220 us-gaap_AvailableForSaleSecurities / us-gaap_InvestmentTypeAxis = us-gaap_PreferredStockMember |
Mutual Funds [Member] |  |
Note 11 (Details) - Summary of Securities [Line Items] |  |
Amortized cost - available for sale |  | 129,473 us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_InvestmentTypeAxis = jjsf_MutualFundsMember
Gross unrealized gains - available for sale |  | 760 us-gaap_AvailableForSaleSecuritiesGrossUnrealizedGains / us-gaap_InvestmentTypeAxis = jjsf_MutualFundsMember
Gross unrealized losses - available for sale |  | 2,116 us-gaap_AvailableForSaleSecuritiesGrossUnrealizedLoss / us-gaap_InvestmentTypeAxis = jjsf_MutualFundsMember
Fair market value - available for sale |  | $ 128,117 us-gaap_AvailableForSaleSecurities / us-gaap_InvestmentTypeAxis = jjsf_MutualFundsMember

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- Definition Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=28360136&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27232-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26610-111562 + Details
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- Definition This item represents the cost of debt and equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.2) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Amount of unrealized gain before deducting unrealized loss on investments in debt and equity securities classified as available-for-sale securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563 + Details
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- Definition Amount of unrealized loss before deducting unrealized gain on investments in available-for-sale securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563 + Details
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- Definition Fair value of investments in debt securities classified as held-to-maturity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27232-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27232-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27232-111563 + Details
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- Definition Amount of unrecognized gain before loss on investments in held-to-maturity securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27232-111563 + Details
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