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Note 11 (Details) - Summary of Securities (USD $) In Thousands, unless otherwise specified	3 Months Ended	12 Months Ended
	Dec. 27, 2014	Sep. 27, 2014
Note 11 (Details) - Summary of Securities [Line Items]
Amortized Cost - Held To Maturity	$ 2,000us-gaap_HeldToMaturitySecuritiesAmortizedCostBeforeOtherThanTemporaryImpairment	$ 2,000us-gaap_HeldToMaturitySecuritiesAmortizedCostBeforeOtherThanTemporaryImpairment
Gross Unrealized Gains - Held To Maturity	2us-gaap_HeldToMaturitySecuritiesUnrecognizedHoldingGains
Gross Unrealized Losses - Held To Maturity	0us-gaap_HeldToMaturitySecuritiesUnrecognizedHoldingLosses	13us-gaap_HeldToMaturitySecuritiesUnrecognizedHoldingLosses
Fair Market Value - Held To Maturity	2,002us-gaap_HeldToMaturitySecuritiesFairValue	1,987us-gaap_HeldToMaturitySecuritiesFairValue
Amortized Cost - Available For Sale	129,001us-gaap_AvailableForSaleSecuritiesAmortizedCost	129,473us-gaap_AvailableForSaleSecuritiesAmortizedCost
Gross Unrealized Gains - Available For Sale	426us-gaap_AvailableForSaleSecuritiesGrossUnrealizedGains	760us-gaap_AvailableForSaleSecuritiesGrossUnrealizedGains
Gross Unrealized Losses - Available For Sale	3,704us-gaap_AvailableForSaleSecuritiesGrossUnrealizedLoss	2,116us-gaap_AvailableForSaleSecuritiesGrossUnrealizedLoss
Fair Market Value - Available For Sale	125,723us-gaap_AvailableForSaleSecurities	128,117us-gaap_AvailableForSaleSecurities
US Government Corporations and Agencies Securities [Member]
Note 11 (Details) - Summary of Securities [Line Items]
Amortized Cost - Held To Maturity	2,000us-gaap_HeldToMaturitySecuritiesAmortizedCostBeforeOtherThanTemporaryImpairment / us-gaap_InvestmentTypeAxis = us-gaap_USGovernmentCorporationsAndAgenciesSecuritiesMember	2,000us-gaap_HeldToMaturitySecuritiesAmortizedCostBeforeOtherThanTemporaryImpairment / us-gaap_InvestmentTypeAxis = us-gaap_USGovernmentCorporationsAndAgenciesSecuritiesMember
Gross Unrealized Gains - Held To Maturity	2us-gaap_HeldToMaturitySecuritiesUnrecognizedHoldingGains / us-gaap_InvestmentTypeAxis = us-gaap_USGovernmentCorporationsAndAgenciesSecuritiesMember
Gross Unrealized Losses - Held To Maturity	0us-gaap_HeldToMaturitySecuritiesUnrecognizedHoldingLosses / us-gaap_InvestmentTypeAxis = us-gaap_USGovernmentCorporationsAndAgenciesSecuritiesMember	13us-gaap_HeldToMaturitySecuritiesUnrecognizedHoldingLosses / us-gaap_InvestmentTypeAxis = us-gaap_USGovernmentCorporationsAndAgenciesSecuritiesMember
Fair Market Value - Held To Maturity	2,002us-gaap_HeldToMaturitySecuritiesFairValue / us-gaap_InvestmentTypeAxis = us-gaap_USGovernmentCorporationsAndAgenciesSecuritiesMember	1,987us-gaap_HeldToMaturitySecuritiesFairValue / us-gaap_InvestmentTypeAxis = us-gaap_USGovernmentCorporationsAndAgenciesSecuritiesMember
Mutual Funds [Member]
Note 11 (Details) - Summary of Securities [Line Items]
Amortized Cost - Available For Sale	117,376us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_InvestmentTypeAxis = jjsf_MutualFundsMember	129,473us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_InvestmentTypeAxis = jjsf_MutualFundsMember
Gross Unrealized Gains - Available For Sale	318us-gaap_AvailableForSaleSecuritiesGrossUnrealizedGains / us-gaap_InvestmentTypeAxis = jjsf_MutualFundsMember	760us-gaap_AvailableForSaleSecuritiesGrossUnrealizedGains / us-gaap_InvestmentTypeAxis = jjsf_MutualFundsMember
Gross Unrealized Losses - Available For Sale	3,699us-gaap_AvailableForSaleSecuritiesGrossUnrealizedLoss / us-gaap_InvestmentTypeAxis = jjsf_MutualFundsMember	2,116us-gaap_AvailableForSaleSecuritiesGrossUnrealizedLoss / us-gaap_InvestmentTypeAxis = jjsf_MutualFundsMember
Fair Market Value - Available For Sale	113,995us-gaap_AvailableForSaleSecurities / us-gaap_InvestmentTypeAxis = jjsf_MutualFundsMember	128,117us-gaap_AvailableForSaleSecurities / us-gaap_InvestmentTypeAxis = jjsf_MutualFundsMember
Preferred Stock [Member]
Note 11 (Details) - Summary of Securities [Line Items]
Amortized Cost - Available For Sale	11,625us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_InvestmentTypeAxis = us-gaap_PreferredStockMember
Gross Unrealized Gains - Available For Sale	108us-gaap_AvailableForSaleSecuritiesGrossUnrealizedGains / us-gaap_InvestmentTypeAxis = us-gaap_PreferredStockMember
Gross Unrealized Losses - Available For Sale	5us-gaap_AvailableForSaleSecuritiesGrossUnrealizedLoss / us-gaap_InvestmentTypeAxis = us-gaap_PreferredStockMember
Fair Market Value - Available For Sale	$ 11,728us-gaap_AvailableForSaleSecurities / us-gaap_InvestmentTypeAxis = us-gaap_PreferredStockMember

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Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

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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.

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