Document And Entity Information Other income (expense) Note To Financial Statement Details Textual Note 2 - Revenue Recognition Note 4 - Earnings Per Share us-gaap_InsuranceSettlementsReceivable Insurance Settlements Receivable Beginning balance Ending balance Note 5 - Share-based Compensation Note 9 - Inventory Note 10 - Segment Reporting Note 11 - Goodwill and Intangible Assets Note 12 - Commitments and Contingencies Note 13 - Accumulated Other Comprehensive Income (Loss) Note 14 - Leases Income Tax Disclosure [Text Block] Note 15 - Related Parties Note 17 - Share Repurchase Program Note 18 - Manufacturing Facility Closures and Disposals Note 2 - Revenue Recognition - Contract Liability (Details) us-gaap_LiabilitiesCurrent Total current liabilities Note 4 - Earnings Per Share - Calculation of EPS (Details) Note 5 - Share-based Compensation - Summary of Share-based Compensation Expense (Benefit) (Details) Note 9 - Inventory - Summary of Inventories (Details) Note 10 - Segment Reporting - Operations Information by Reporting Segment (Details) Accumulated Other Comprehensive Income (Loss) [Table] Acquired Finite-Lived Intangible Assets, Weighted Average Useful Life us-gaap_AcquiredFiniteLivedIntangibleAssetsWeightedAverageUsefulLife Note 11 - Goodwill and Intangible Assets - Intangible Assets by Reporting Segment (Details) Note 11 - Goodwill and Intangible Assets - Goodwill by Reporting Segment (Details) Note 12 - Commitments and Contingencies - Schedule of Insurance Receivable (Details) Note 13 - Accumulated Other Comprehensive Income (Loss) - Changes to the Components of Accumulated Other Comprehensive Loss (Details) Note 14 - Leases - Components of Lease Expense (Details) Note 14 - Leases - Supplemental Balance Sheet Information Related to Leases (Details) Other general expense Other general expense Foreign currency translation adjustment Foreign currency translation adjustments Note 14 - Leases - Supplemental Cash Flow Information Related to Leases (Details) Note 14 - Leases - Maturities of Lease Liabilities (Details) Note 15 - Related Parties - Schedule of Related Party Transactions (Details) Note 17 - Share Repurchase Program - Schedule of Repurchase Agreements (Details) Note 18 - Manufacturing Facility Closures and Disposals - Restructuring and Related Costs (Details) Notes To Financial Statements Notes To Financial Statements [Abstract] Goodwill and Intangible Assets Disclosure [Text Block] Schedule of Goodwill [Table Text Block] Goodwill [Table] Accrued liabilities Accrued compensation expense Dividends payable Accounts payable Revolving Credit Facility [Member] Proceeds from disposal of property and equipment Credit Facility [Axis] Credit Facility [Domain] Distribution The amount of distribution expenses incurred during the period. Fire related costs Unusual or Infrequent Item, or Both, Loss, Gross us-gaap_UnusualOrInfrequentItemInsuranceProceeds Unusual or Infrequent Item, or Both, Insurance Proceeds Insurance proceeds for inventory, fixed asset losses, and other fire related costs us-gaap_PolicyTextBlockAbstract Accounting Policies us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesIssuedInPeriod Share-Based Compensation Arrangement by Share-Based Payment Award, Shares Issued in Period (in shares) Trade Names [Member] Franchise Rights [Member] Accrued insurance liability Lease Payments [Member] Represents lease payments. us-gaap_PaymentsToAcquirePropertyPlantAndEquipment Purchases of property, plant and equipment us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements RSU's, PSU’s and options (in shares) Pass Through Payments [Member] Relating to pass through payments. Noncompete Agreements [Member] Current liabilities Developed Technology Rights [Member] Product [Member] us-gaap_Assets Total Assets Food Service Disclosure of Share-Based Compensation Arrangements by Share-Based Payment Award [Table Text Block] Schedule of Share-Based Compensation Arrangements by Share-Based Payment Award [Table] Technology-Based Intangible Assets [Member] Property, plant and equipment, at cost us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic Net earnings available to common stockholders Customer Relationships [Member] us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted Net earnings available to common stockholders plus assumed conversions The Credit Agreement [Member] Represents the credit agreement. Distribution Rights [Member] us-gaap_AmountOfDilutiveSecuritiesStockOptionsAndRestrictiveStockUnits RSU's, PSU’s and options The above compensation is net of tax benefits us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense us-gaap_DebtInstrumentVariableInterestRateTypeExtensibleEnumeration Debt Instrument, Variable Interest Rate, Type [Extensible Enumeration] The Amended Credit Agreement [Member] Represents the amended credit agreement. Share-Based Payment Arrangement [Text Block] Federal Funds Rate [Member] Represents the federal funds rate variable rate. Finite-Lived Intangible Assets by Major Class [Axis] jjsf_LineOfCreditFacilityOptionsToIncreaseSizeOfCreditFacilityValue1 Line of Credit Facility, Options to Increase Size of Credit Facility, Value 1 Represents the first option for increase of credit facility. Finite-Lived Intangible Assets, Major Class Name [Domain] jjsf_LineOfCreditFacilityOptionsToIncreaseSizeOfCreditFacilityValue2 Line of Credit Facility, Options to Increase Size of Credit Facility, Value 2 Represents the second option for increase of credit facility. Receivable for Catastrophic Claims Disclosure [Table Text Block] Tabular disclosure for the receivable from catastrophic claims disclosure. Award Type [Domain] Effective Income Tax Rate Reconciliation [Table] Net earnings NET EARNINGS Net Earnings Award Type [Axis] Finite-lived intangible assets, accumulated amortization Gain on insurance proceeds received for damage to property, plant, and equipment Gain on insurance proceeds received for damage to property, plant, and equipment Gain on Insurance Proceeds Received for Damage to Property, Plant, and Equipment The amount of insurance proceeds received for damage to property, plant, and equipment. Proceeds from insurance for fixed assets Restricted Stock Units (RSUs) [Member] Finite-lived intangible assets, gross Performance Shares [Member] Share-Based Payment Arrangement, Option [Member] Indefinite-lived intangible assets, gross Loss Contingencies [Table] Less accumulated depreciation and amortization Commitments and Contingencies Disclosure [Text Block] Property, Plant and Equipment, Net Property, plant and equipment, net Goodwill Goodwill us-gaap_PropertyPlantAndEquipmentGross Total Property, plant and equipment, at cost Plant machinery and equipment Office equipment Construction in progress Land Buildings and improvements NFI [Member] Represents information related to NFI. Investing activities: Earnings Per Share, Basic, by Common Class, Including Two-Class Method [Table] us-gaap_IncreaseDecreaseInOtherOperatingCapitalNet Net changes in other operating assets and liabilities Earnings Per Share [Text Block] Related Party Transaction [Table] Related party transaction, amount Related Party Transaction, Amounts of Transaction Related Party Transactions Disclosure [Text Block] Income taxes Schedule of Related Party Transactions [Table Text Block] jjsf_LineOfCreditFacilityIncreaseInMaximumBorrowingCapacity Line Of Credit Facility Increase In Maximum Borrowing Capacity represents the increase in maximum borrowing capacity. jjsf_AssetsNoncurrentExcludingPropertyPlantAndEquipmentNet Total other assets Sum of the carrying amounts as of the balance sheet date of all assets that are expected to be realized in cash, sold or consumed after one year or beyond the normal operating cycle, if longer, excluding amount after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. General corporate expenses Total operating expenses Administrative Cash and cash equivalents Employee share-based compensation us-gaap_AllocatedShareBasedCompensationExpenseNetOfTax Amendment Flag us-gaap_ComprehensiveIncomeNetOfTax Comprehensive Income dei_CityAreaCode City Area Code Reclassifications [Text Block] us-gaap_SharesOutstanding Balance (in shares) Balance (in shares) Common Stock, Shares, Outstanding (in shares) Current Fiscal Year End Date us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 Debt Instrument, Basis Spread on Variable Rate us-gaap_LeaseCost Total net lease cost us-gaap_OperatingLeaseWeightedAverageDiscountRatePercent Operating Lease, Weighted Average Discount Rate, Percent Document Fiscal Period Focus Operating lease cost in Cost of goods sold and Operating Expenses Document Fiscal Year Focus Short-term lease cost in Cost of goods sold and Operating Expenses Lease, Cost [Table Text Block] dei_DocumentPeriodEndDate Document Period End Date us-gaap_OperatingLeaseWeightedAverageRemainingLeaseTerm1 Operating Lease, Weighted Average Remaining Lease Term dei_EntityFileNumber Entity File Number dei_EntityEmergingGrowthCompany Entity Emerging Growth Company dei_DocumentType Document Type dei_EntitySmallBusiness Entity Small Business dei_EntityShellCompany Entity Shell Company Document Information [Line Items] Gain on insurance proceeds received, or expected to be received, in excess of operating losses recognized Gain on Business Interruption Insurance Recovery Document Information [Table] us-gaap_SeveranceCosts1 Severance Costs dei_EntityFilerCategory Entity Filer Category Debt Instrument [Axis] us-gaap_OtherRestructuringCosts Other Restructuring Costs dei_EntityCurrentReportingStatus Entity Current Reporting Status Debt Instrument, Name [Domain] Charges Restructuring Charges us-gaap_DividendsCommonStock Dividends declared dei_EntityNumberOfEmployees Entity Number of Employees Variable Rate [Domain] Share-based compensation us-gaap_IncreaseDecreaseInAccountsReceivable Decrease in accounts receivable Statement of Comprehensive Income [Abstract] dei_EntityTaxIdentificationNumber Entity Tax Identification Number Entity Central Index Key dei_EntityRegistrantName Entity Registrant Name Entity [Domain] Legal Entity [Axis] dei_EntityAddressAddressLine1 Entity Address, Address Line One us-gaap_AmortizationOfIntangibleAssets Amortization of Intangible Assets ecd_NonRule10b51ArrTrmntdFlag Non-Rule 10b5-1 Arrangement Terminated [Flag] dei_EntityAddressCityOrTown Entity Address, City or Town ecd_Rule10b51ArrTrmntdFlag Rule 10b5-1 Arrangement Terminated [Flag] ecd_Rule10b51ArrAdoptedFlag Rule 10b5-1 Arrangement Adopted [Flag] dei_EntityAddressPostalZipCode Entity Address, Postal Zip Code dei_EntityAddressStateOrProvince Entity Address, State or Province ecd_NonRule10b51ArrAdoptedFlag Non-Rule 10b5-1 Arrangement Adopted [Flag] us-gaap_AllowanceForDoubtfulAccountsReceivable Accounts Receivable, Allowance for Credit Loss Material Terms of Trading Arrangement [Text Block] dei_EntityCommonStockSharesOutstanding Entity Common Stock, Shares Outstanding (in shares) Trading Arrangements, by Individual [Table] Repurchase of common stock Repurchase of common stock (in shares) Stock Repurchased and Retired During Period, Shares (in shares) us-gaap_IncreaseDecreaseInInventories Decrease in accounts receivable dei_TradingSymbol Trading Symbol jjsf_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsVolatilityCalculationTerm Share Based Compensation Arrangement by Share Based Payment Award Fair Value Assumptions Volatility Calculation Term The term calculated for volatility in fair value assumptions. Five Year Options [Member] The term of an option. Ten Year Options [Member] Term of an option. dei_LocalPhoneNumber Local Phone Number Organization, Consolidation and Presentation of Financial Statements Disclosure and Significant Accounting Policies [Text Block] Common stock issued upon exercise of stock options, net of shares withheld for taxes (in shares) Stock Purchase Plan [Member] Represents the stock purchase plan. us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity Line of Credit Facility, Remaining Borrowing Capacity us-gaap_TableTextBlock Notes Tables Stock Issued to Outside Directors [Member] Type of share-based compensation to outside directors. us-gaap_GainLossOnDispositionOfAssets1 Losses (Gains) from disposals of property & equipment Common stock issued upon vesting of service share units, net of shares withheld for taxes (in shares) us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity Line of Credit Facility, Maximum Borrowing Capacity Common stock issued upon exercise of stock options, net of shares withheld for taxes Common stock issued upon vesting of service share units, net of shares withheld for taxes Related and Nonrelated Parties [Axis] Related and Nonrelated Parties [Domain] Food Service [Member] Represents the Food Service segment. us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares) Marketing and selling Equipment parts and other Other Products [Member] Type of food service sales. Retail Supermarket [Member] Represents the Retail Supermarket segment. Raw materials Line of Credit Facility [Table] Packaging materials us-gaap_LiabilitiesAndStockholdersEquity Total Liabilities and Stockholders' Equity Finished goods UNITED STATES Related Party Transaction [Axis] Related Party Transaction [Domain] Retained Earnings Accumulated other comprehensive loss Repair and Maintenance Service [Member] Type of sales. Machine Sales [Member] Type of sales. Frozen Beverages [Member] Represents the Frozen Beverages segment. Debt Disclosure [Text Block] us-gaap_InterestExpense Interest expense Changes in assets and liabilities, net of effects from purchase of companies us-gaap_DisclosureTextBlockAbstract Notes to Financial Statements us-gaap_OtherNoncashIncomeExpense Other Noncurrent operating lease liabilities Operating Lease, Liability, Noncurrent Inventory Disclosure [Text Block] Subsequent Event [Member] Schedule of Inventory, Current [Table Text Block] Inventory, Current [Table] us-gaap_DeferredIncomeTaxesAndTaxCredits Deferred income taxes Total operating lease liabilities Present value of lease obligations, operating leases Subsequent Event [Table] Current operating lease liabilities Operating Lease, Liability, Current Subsequent Event Type [Axis] Other intangible assets, net Subsequent Event Type [Domain] Current finance lease liabilities Noncurrent finance lease liabilities Intangible assets Subsequent Events [Text Block] Operating lease right-of-use assets Operating Lease, Right-of-Use Asset us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue Total minimum payments, operating leases Financing cash flows from finance leases us-gaap_FinanceLeasePrincipalPayments Payments on finance lease obligations Total finance lease liabilities Present value of lease obligations, finance leases us-gaap_LesseeOperatingLeaseLiabilityUndiscountedExcessAmount Less amount representing interest, operating leases us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearThree 2027, operating leases us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseRemainderOfFiscalYear Finite-Lived Intangible Asset, Expected Amortization, Remainder of Fiscal Year us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFour 2028, operating leases Finance lease right-of-use assets in Property, plant and equipment, net us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFive 2029, operating leases us-gaap_FinanceLeaseRightOfUseAssetStatementOfFinancialPositionExtensibleList Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration] us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive Thereafter, operating leases us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo Finite-Lived Intangible Asset, Expected Amortization, Year Two us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree Finite-Lived Intangible Asset, Expected Amortization, Year Three us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour Finite-Lived Intangible Asset, Expected Amortization, Year Four 2025, operating leases us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive Finite-Lived Intangible Asset, Expected Amortization, Year Five us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearTwo 2026, operating leases us-gaap_PaymentsForRestructuring Payments for Restructuring Payments Plant closure expense Restructuring Costs us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths Finite-Lived Intangible Asset, Expected Amortization, Year One Schedule of Acquired Finite-Lived Intangible Assets by Major Class [Table Text Block] Schedule of Acquired Finite-Lived Intangible Asset by Major Class [Table] Other Share-based compensation us-gaap_ShareBasedCompensation us-gaap_FiniteLivedIntangibleAssetUsefulLife Finite-Lived Intangible Asset, Useful Life (Year) Operating expenses Intangible Asset, Finite-Lived [Table] Depreciation of fixed assets Depreciation Depreciation and amortization us-gaap_AssetsCurrent Total current assets Equity [Text Block] Common stock, no par value; authorized, 50,000,000 shares; issued and outstanding 18,996,000 as of December 27, 2025 and 19,440,000 as of September 27, 2025 Adjustments to reconcile net earnings to net cash provided by operating activities Amortization of intangibles and deferred costs The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets and deferred costs. Common Stock, Shares Authorized (in shares) us-gaap_TangibleAssetImpairmentCharges Tangible Asset Impairment Charges Common Stock, Shares, Issued (in shares) jjsf_FinanceLeaseCostTotal Total finance lease cost Amount of finance lease cost. Common stock, par value (in dollars per share) Lessee, Leases [Text Block] The entire disclosure for leases of the lessee. Revision of Prior Period [Axis] Supplemental noncash information on lease liabilities removed due to purchase of leased asset Amount of decrease in lease obligation due to purchase of leased asset. Revision of Prior Period [Domain] Supplemental noncash information on lease liabilities arising from obtaining right-of-use assets jjsf_RightOfUseAssetObtainedInExchangeForLeaseLiability Amount of increase in right-of-use asset obtained in exchange for lease liability. Lessee, Cash Flow Information [Table Text Block] The tabular disclosure of cash flow information of leases of the lessee. Assets and Liabilities, Lessee [Table Text Block] Tabular disclosure of lessee's assets and liabilities. Statistical Measurement [Domain] Lessee, Lease, Description [Table] Operating cash flows from operating leases Maximum [Member] Minimum [Member] Lessee, Lease Liability, Maturity [Table Text Block] Tabular disclosure of undiscounted cash flows of operating and finance lease liability. Product and Service [Axis] Product and Service [Domain] Statistical Measurement [Axis] Operating cash flows from finance leases us-gaap_FinanceLeaseInterestPaymentOnLiability Preferred stock, $1 par value; authorized 10,000,000 shares; none issued Preferred Stock, shares issued (in shares) Property, Plant and Equipment Disclosure [Text Block] Geographical [Axis] Geographical [Domain] Preferred Stock, Shares Authorized (in shares) Inventories Total inventories Preferred stock, par value (in dollars per share) Net sales Fire [Member] Catastrophic Event [Domain] us-gaap_PropertyPlantAndEquipmentUsefulLife Property, Plant and Equipment, Useful Life (Year) Revision of Prior Period, Reclassification, Adjustment [Member] Operating activities: Catastrophic Event [Axis] Schedule of Segment Reporting Information, by Segment [Table Text Block] Schedule of Segment Reporting Information, by Segment [Table] Statement [Line Items] Accounts receivable, net us-gaap_NumberOfReportableSegments Number of Reportable Segments Accumulated Foreign Currency Adjustment Attributable to Parent [Member] AOCI Attributable to Parent [Member] Stockholders' Equity Marketing equipment Amount before accumulated depreciation of equipment used for marketing. Property, Plant and Equipment [Table] Transportation equipment Amount before accumulated depreciation of equipment used for the primary purpose of moving people and products from one place to another. Segment Reporting Disclosure [Text Block] Current assets Investment income Other assets Trade name intangible assets the value of trade names. us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations Cash and cash equivalents at beginning of period Cash and cash equivalents at end of period Assets [Abstract] Effect of exchange rates on cash and cash equivalents us-gaap_EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect Net increase in cash and cash equivalents us-gaap_NetCashProvidedByUsedInFinancingActivities Net cash (used in) financing activities Effect of exchange rates on cash and cash equivalents Segment operating income Operating Income Operating Income (Loss) us-gaap_NetCashProvidedByUsedInOperatingActivities Net cash provided by operating activities Amounts recognized as revenue Prepaid expenses and other us-gaap_NetCashProvidedByUsedInInvestingActivities Net cash (used in) investing activities Segment gross profit Gross profit Cost of goods sold Liability for Catastrophe Claims [Table] Deferred income taxes Consolidation Items [Domain] us-gaap_InventoryWriteDown Inventory Write-down us-gaap_ContractWithCustomerLiability Beginning Balance Ending Balance Consolidation Items [Axis] us-gaap_SelfInsuranceReserve Self Insurance Reserve us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued us-gaap_LettersOfCreditOutstandingAmount Letters of Credit Outstanding, Amount us-gaap_PaymentsOfDividends Payment of cash dividend us-gaap_PaymentsForRepurchaseOfCommonStock Payments to repurchase common stock us-gaap_AccruedInsuranceCurrentAndNoncurrent Accrued Insurance Retained Earnings [Member] Proceeds from issuance of stock us-gaap_AccountsPayableTradeCurrentAndNoncurrent Accounts Payable, Trade Common Stock Including Additional Paid in Capital [Member] us-gaap_StockRepurchaseProgramPeriodInForce1 Share-Repurchase Program, Term (Year) Class of Treasury Stock [Table Text Block] Equity Components [Axis] Class of Treasury Stock [Table] Equity Component [Domain] Stock, Class of Stock [Table] Transportation Management [Member] Represents transportation management. jjsf_DistributionCenters Distribution Centers Number of distributions centers. us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest Earnings before income taxes Share Repurchase Program 2025 [Member] Represents the 2025 share repurchase program. Comprehensive Income (Loss) Note [Text Block] us-gaap_LineOfCredit Long-Term Line of Credit Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block] Average price per share (in dollars per share) Common Stock, Par or Stated Value Per Share (in dollars per share) Price per share of stock repurchased and retired during the period. License and Rights [Member] Type of intangible asset. jjsf_ContractWithCustomerAssetAllowanceForDeductions Contract with Customer, Asset, Allowance for Deductions Represents the amount of allowance for deductions for right to consideration in exchange for good or service transferred to customer. Disaggregation of Revenue [Table] Revenue from Contract with Customer [Text Block] dei_DocumentQuarterlyReport Document Quarterly Report dei_EntityIncorporationStateCountryCode Entity Incorporation, State or Country Code us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate Unrecognized Tax Benefits that Would Impact Effective Tax Rate Accounting Policies [Abstract] dei_DocumentTransitionReport Document Transition Report dei_EntityInteractiveDataCurrent Entity Interactive Data Current us-gaap_CommonStockDividendsPerShareDeclared Common Stock, Dividends, Per Share, Declared (in dollars per share) Related Party [Member] dei_SecurityExchangeName Security Exchange Name dei_Security12bTitle Title of 12(b) Security jjsf_EffectOfDilutiveSecuritiesOptionsPerShare RSU's, PSU’s and options (in dollars per share) Effect of dilutive securities options per share Collaborative Arrangement and Arrangement Other than Collaborative [Table] Capital expenditures Labor Management Services [Member] Represents labor management services. Segments [Axis] Segments [Domain] us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount Weighted average number of diluted shares (in shares) Net earnings available to common stockholders plus assumed conversions (in shares) us-gaap_RepaymentsOfLinesOfCredit Repayment of borrowings under credit facility Non-US [Member] Borrowings under credit facility Statement [Table] Statement of Financial Position [Abstract] Net earnings available to common stockholders plus assumed conversions (in dollars per share) Earnings per diluted share (in dollars per share) Weighted average number of basic shares (in shares) Net earnings available to common stockholders (in shares) us-gaap_RestructuringIncurredCostStatementOfIncomeOrComprehensiveIncomeExtensibleEnumeration Restructuring Charges, Statement of Income or Comprehensive Income [Extensible Enumeration] us-gaap_EffectiveIncomeTaxRateContinuingOperations Effective Income Tax Rate Reconciliation, Percent Earnings per basic share (in dollars per share) Net earnings available to common stockholders (in dollars per share) Contract with Customer, Contract Asset, Contract Liability, and Receivable [Table Text Block] Statement of Cash Flows [Abstract] us-gaap_LesseeFinanceLeaseRemainingLeaseTerm Lessee, Finance Lease, Remaining Lease Term Statement of Stockholders' Equity [Abstract] Income Statement [Abstract] us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent Total other comprehensive income (loss), net of tax us-gaap_RestructuringReserve Balance Balance us-gaap_LesseeOperatingLeaseRemainingLeaseTerm Lessee, Operating Lease, Remaining Lease Term Non-cash plant shutdown expenses us-gaap_RestructuringReserveSettledWithoutCash2 Interest on lease liabilities in Interest expense & other us-gaap_FinanceLeaseLiabilityPaymentsDue Total minimum payments, finance leases Amortization of assets in Cost of goods sold and Operating Expenses us-gaap_FinanceLeaseLiabilityPaymentsDueYearFive 2029, finance leases us-gaap_FinanceLeaseLiabilityPaymentsDueAfterYearFive Thereafter, finance leases us-gaap_FinanceLeaseLiabilityUndiscountedExcessAmount Less amount representing interest, finance leases 2025, finance lease Manufacturing Facility Closing in Atlanta GA [Member] Represents Manufacturing Facility Closing in Atlanta GA . us-gaap_FinanceLeaseLiabilityPaymentsDueYearTwo 2026, finance leases Manufacturing Facility Closing in Colton CA [Member] Represents Manufacturing Facility Closing in Colton CA. us-gaap_FinanceLeaseLiabilityPaymentsDueYearThree 2027, finance leases us-gaap_FinanceLeaseLiabilityPaymentsDueYearFour 2028, finance leases Accounting Standards Update and Change in Accounting Principle [Table] Restructuring Plan [Axis] Restructuring Plan [Domain] Manufacturing Facility Closing in Holly Ridge, NC [Member] Represents Manufacturing Facility Closing in Holly Ridge, NC. jjsf_OperatingLeaseAndFinanceLeaseImpairmentLoss Operating Lease and Finance Lease, Impairment Loss Amount of impairment loss from right-of-use asset from operating lease and finance lease. Accounting Standards Update and Change in Accounting Principle [Text Block] srt_StockRepurchaseProgramAuthorizedAmount1 Share Repurchase Program, Authorized, Amount Other Restructuring [Member] Type of Restructuring [Domain] Facility Closing [Member] us-gaap_FinanceLeaseWeightedAverageDiscountRatePercent Finance Lease, Weighted Average Discount Rate, Percent Share Repurchase Program [Domain] Share Repurchase Program [Axis] Employee Severance [Member] Board Advisory Consulting Fees [Member] Related to board advisory consulting fees. Restructuring and Related Activities Disclosure [Text Block] Share Repurchase Program 2026 [Member] Represents the 2026 Share Repurchase Program. Restructuring and Related Costs [Table Text Block] Restructuring Cost [Table] Restructuring Type [Axis] us-gaap_FinanceLeaseWeightedAverageRemainingLeaseTerm1 Finance Lease, Weighted Average Remaining Lease Term Financing activities: AMC Global [Member] Related to AMC Global. Other long-term liabilities us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent jjsf_PaymentsOfVestedShareBasedCompensationNonOptionEquityInstruments Purchase of vested employee service share units and performance share units The cash outflow for vested shared based compensation non option equity instruments. Employee Service Share Units and Performance Share Units [Member] Represents Employee Service Share Units and Performance Share Units. Segment Reporting, Reconciling Item, Corporate Nonsegment [Member] us-gaap_StockholdersEquity Total stockholders' equity Balance Balance Class of Stock [Axis] Additions to contract liability The amount of additions to contract with customer liability. Long-term debt Reclassification [Table] Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Operating Segments [Member]