Document And Entity Information Other income (expense) us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree Finite-Lived Intangible Asset, Expected Amortization, Year One Note To Financial Statement Details Textual us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour Finite-Lived Intangible Asset, Expected Amortization, Year Four us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths 2024, operating leases Note 2- Revenue Recognition us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive Finite-Lived Intangible Asset, Expected Amortization, Year Four us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearTwo 2025, operating leases Note 4 - Earnings Per Share Note 5 - Share-based Compensation and Post-retirement Benefits Note 9 - Inventory Note 10 - Segment Information us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths Finite-Lived Intangible Asset, Expected Amortization, Remainder of Fiscal Year Note 11 - Goodwill and Intangible Assets Schedule of Acquired Finite-Lived Intangible Assets by Major Class [Table Text Block] Note 13 - Accumulated Other Comprehensive Income (Loss) Note 14 - Leases Note 2 - Revenue Recognition - Contract Liability (Details) Income Tax Disclosure [Text Block] Note 4 - Earnings Per Share - Calculation of EPS (Details) Other Share-based compensation us-gaap_ShareBasedCompensation us-gaap_LiabilitiesCurrent Total current liabilities Note 5 - Share-based Compensation and Post-retirement Benefits - Summary of Share-based Compensation Expense (Benefit) (Details) Note 9 - Inventory - Summary of Inventories (Details) Note 10 - Segment Information - Operations Information by Reporting Segment (Details) us-gaap_FiniteLivedIntangibleAssetUsefulLife Finite-Lived Intangible Asset, Useful Life Note 11 - Goodwill and Intangible Assets - Intangible Assets by Reporting Segment (Details) Note 11 -Goodwill and Intangible Assets - Goodwill by Reporting Segment (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) Note 14 - Leases - Supplemental Cash Flow Information Related to Leases (Details) Acquired Finite-Lived Intangible Assets, Weighted Average Useful Life us-gaap_AcquiredFiniteLivedIntangibleAssetsWeightedAverageUsefulLife Note 14 - Leases - Maturities of Lease Liabilities (Details) Operating Expenses [Abstract] Notes To Financial Statements Notes To Financial Statements [Abstract] us-gaap_OtherOperatingIncomeExpenseNet Other general expense Foreign currency translation adjustment Foreign currency translation adjustments Proceeds from redemption and sales of marketable securities Proceeds from Sale and Maturity of Marketable Securities Depreciation of fixed assets Depreciation Depreciation and amortization us-gaap_DepreciationDepletionAndAmortization us-gaap_AssetsCurrent Total current assets Common stock, no par value; authorized, 50,000,000 shares; issued and outstanding 19,386,000 and 19,332,000 respectively 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) 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) Goodwill and Intangible Assets Disclosure [Text Block] Schedule of Goodwill [Table Text Block] Lessee, Leases [Text Block] The entire disclosure for leases of the lessee. Accrued liabilities 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. Accrued compensation expense 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] Operating cash flows from operating leases Operating Lease, Payments Maximum [Member] Dividends payable Minimum [Member] Lessee, Lease Liability, Maturity [Table Text Block] Tabular disclosure of undiscounted cash flows of operating and finance lease liability. Accounts payable Revolving Credit Facility [Member] Product and Service [Axis] Product and Service [Domain] Statistical Measurement [Axis] Operating cash flows from finance leases us-gaap_FinanceLeaseInterestPaymentOnLiability Proceeds from disposal of property and equipment Credit Facility [Axis] Preferred stock, $1 par value; authorized 10,000,000 shares; none issued Credit Facility [Domain] Distribution The amount of distribution expenses incurred during the period. Preferred stock, shares issued (in shares) us-gaap_PolicyTextBlockAbstract Accounting Policies Property, Plant and Equipment Disclosure [Text Block] Preferred Stock, Shares Authorized (in shares) us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesIssuedInPeriod Share-Based Compensation Arrangement by Share-Based Payment Award, Shares Issued in Period (in shares) Trade Names [Member] Inventories Total Inventories Franchise Rights [Member] Preferred stock, par value (in dollars per share) Accrued insurance liability Sales Net sales Capital expenditures us-gaap_PaymentsToAcquirePropertyPlantAndEquipment Purchases of property, plant and equipment RSU's and options (in shares) RSU's and options (in shares) Current Liabilities Developed Technology Rights [Member] Assets us-gaap_Assets Total Assets Disclosure of Share-Based Compensation Arrangements by Share-Based Payment Award [Table Text Block] Technology-Based Intangible Assets [Member] Property, plant and equipment, at cost Operating activities: Net earnings available to common stockholders Net earnings available to common stockholders Customer Relationships [Member] Schedule of Segment Reporting Information, by Segment [Table Text Block] Net earnings available to common stockholders plus assumed conversions Net earnings available to common stockholders plus assumed conversions The Credit Agreement [Member] Represents the credit agreement. Distribution Rights [Member] Statement [Line Items] RSU's and options RSU'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] Accounts receivable, net us-gaap_NumberOfOperatingSegments Number of Operating Segments us-gaap_NumberOfReportableSegments Number of Reportable Segments Accumulated Foreign Currency Adjustment Attributable to Parent [Member] 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] AOCI Attributable to Parent [Member] jjsf_LineOfCreditFacilityOptionsToIncreaseSizeOfCreditFacilityValue2 Line of Credit Facility, Options to Increase Size of Credit Facility, Value 2 Represents the second option for increase of credit facility. Buildings Amount before accumulated depreciation of building structures held for productive use. Stockholders' Equity Marketing equipment Amount before accumulated depreciation of equipment used for marketing. Improvements Amount before accumulated depreciation of improvements. 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] Award Type [Domain] Current assets Investment income Fair Value Disclosures [Text Block] Net earnings NET EARNINGS Net Earnings Award Type [Axis] Finite-lived intangible assets, accumulated amortization us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations Cash and cash equivalents at beginning of period Cash and cash equivalents at end of period Effect of exchange rates on cash and cash equivalents us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect Net increase (decrease) in cash and cash equivalents Restricted Stock Units (RSUs) [Member] Finite-lived intangible assets, gross Other assets us-gaap_NetCashProvidedByUsedInFinancingActivities Net cash provided by (used in) financing activities Performance Shares [Member] Operating income us-gaap_OperatingIncomeLoss Operating Income us-gaap_NetCashProvidedByUsedInOperatingActivities Net cash provided by (used in) operating activities Amounts recognized as revenue Share-Based Payment Arrangement, Option [Member] Prepaid expenses and other us-gaap_NetCashProvidedByUsedInInvestingActivities Net cash (used in) investing activities us-gaap_GrossProfit Gross profit Cost of goods sold Indefinite-lived intangible assets, gross Deferred income taxes Less accumulated depreciation and amortization us-gaap_ContractWithCustomerLiability Beginning Balance Ending Balance us-gaap_PropertyPlantAndEquipmentNet Property, plant and equipment, net Goodwill us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued us-gaap_PropertyPlantAndEquipmentGross Total Property, plant and equipment, at cost Plant machinery and equipment Office equipment Construction in progress Land us-gaap_PaymentsOfDividends Payment of cash dividend us-gaap_Investments Investments NFI [Member] Represents information related to NFI. Distribution and Shipping Costs [Member] Represents distribution and shipping costs. Investing activities: us-gaap_HeldToMaturitySecurities Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss Retained Earnings [Member] Earnings Per Share [Text Block] Proceeds from issuance of stock us-gaap_AccountsPayableTradeCurrentAndNoncurrent Accounts Payable, Trade Common Stock Including Additional Paid in Capital [Member] us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities (Decrease) in accounts payable and accrued liabilities us-gaap_MarketableSecuritiesUnrealizedGainLoss Marketable Security, Unrealized Gain (Loss) us-gaap_RelatedPartyTransactionAmountsOfTransaction Related Party Transaction, Amounts of Transaction Related Party Transactions Disclosure [Text Block] Income tax expense us-gaap_MarketableSecuritiesGainLossExcludingOtherThanTemporaryImpairments (Gain) loss on marketable securities Marketable Securities, Gain (Loss) Equity Components [Axis] Equity Component [Domain] jjsf_LineOfCreditFacilityIncreaseInMaximumBorrowingCapacity Line Of Credit Facility Increase In Maximum Borrowing Capacity represents the increase in maximum borrowing capacity. us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest Earnings before income taxes 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. us-gaap_OperatingExpenses Total operating expenses Administrative Coupon redemption jjsf_RevenueFromContractWithCustomerAdjustment The amount of adjustment to revenue from contract with customer. Comprehensive Income (Loss) Note [Text Block] us-gaap_LineOfCredit Long-Term Line of Credit Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block] License and Rights [Member] Type of intangible asset. Cash and cash equivalents 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. Biscuits [Member] Information pertaining to biscuits. Employee share-based compensation us-gaap_AllocatedShareBasedCompensationExpenseNetOfTax Revenue from Contract with Customer [Text Block] Document Quarterly Report Entity Incorporation, State or Country Code Amendment Flag us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate Unrecognized Tax Benefits that Would Impact Effective Tax Rate Accounting Policies [Abstract] us-gaap_ComprehensiveIncomeNetOfTax Comprehensive Income Document Transition Report dei_CityAreaCode City Area Code dei_EntityInteractiveDataCurrent Entity Interactive Data Current Related Party [Member] Security Exchange Name Common Stock, Shares, Outstanding (in shares) Balance (in shares) Balance (in shares) us-gaap_DebtWeightedAverageInterestRate Debt, Weighted Average Interest Rate Title of 12(b) Security Current Fiscal Year End Date us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 Debt Instrument, Basis Spread on Variable Rate us-gaap_LeaseCost Total net lease cost us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets Decrease in prepaid expenses 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 RSU's and options (in dollars per share) RSU's and options (in dollars per share) Effect of dilutive securities options per share Lease, Cost [Table Text Block] Coupon Redemtion [Member] Coupon redemtion [member] dei_DocumentPeriodEndDate Document Period End Date us-gaap_OperatingLeaseWeightedAverageRemainingLeaseTerm1 Operating Lease, Weighted Average Remaining Lease Term dei_EntityFileNumber Entity File Number Entity Emerging Growth Company dei_DocumentType Document Type Entity Small Business dei_EntityShellCompany Entity Shell Company Document Information [Line Items] Labor Management Services [Member] Represents labor management services. Document Information [Table] Thinsters Cookie Business [Member] Thinsters cookie business Entity Filer Category Debt Instrument [Axis] dei_EntityCurrentReportingStatus Entity Current Reporting Status Debt Instrument, Name [Domain] Dividends declared Dividends declared Segments [Axis] Segments [Domain] Variable Rate [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 Variable Rate [Axis] Share-based compensation Share-based compensation us-gaap_IncreaseDecreaseInAccountsReceivable Decrease in accounts receivable Statement of Comprehensive Income [Abstract] Entity Tax Identification Number Entity Central Index Key dei_EntityRegistrantName Entity Registrant Name Borrowings under credit facility Entity [Domain] Legal Entity [Axis] Statement [Table] dei_EntityAddressAddressLine1 Entity Address, Address Line One 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_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] us-gaap_EffectiveIncomeTaxRateContinuingOperations Effective Income Tax Rate Reconciliation, Percent ecd_Rule10b51ArrAdoptedFlag Rule 10b5-1 Arrangement Adopted [Flag] dei_EntityAddressPostalZipCode Entity Address, Postal Zip Code Earnings per basic share (in dollars per share) Net earnings available to common stockholders (in dollars per share) Business Acquisition [Axis] dei_EntityAddressStateOrProvince Entity Address, State or Province Business Acquisition, Acquiree [Domain] ecd_NonRule10b51ArrAdoptedFlag Non-Rule 10b5-1 Arrangement Adopted [Flag] Contract with Customer, Contract Asset, Contract Liability, and Receivable [Table Text Block] us-gaap_AllowanceForDoubtfulAccountsReceivable Accounts Receivable, Allowance for Credit Loss Material Terms of Trading Arrangement [Text Block] Statement of Cash Flows [Abstract] dei_EntityCommonStockSharesOutstanding Entity Common Stock, Shares Outstanding (in shares) us-gaap_LesseeFinanceLeaseRemainingLeaseTerm Lessee, Finance Lease, Remaining Lease Term Statement of Stockholders' Equity [Abstract] Income Statement [Abstract] Other comprehensive income (loss) Total other comprehensive income, net of tax us-gaap_LesseeOperatingLeaseRemainingLeaseTerm Lessee, Operating Lease, Remaining Lease Term us-gaap_IncreaseDecreaseInInventories Decrease (Increase) in inventories Trading Symbol Interest on lease liabilities in Interest expense & other 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. us-gaap_FinanceLeaseLiabilityPaymentsDue Total minimum payments, finance leases Ten Year Options [Member] Term of an option. Amortization of assets in Cost of goods sold and Operating Expenses Issuance of common stock for employee stock purchase plan (in shares) us-gaap_FinanceLeaseLiabilityPaymentsDueYearFive 2028, finance leases us-gaap_FinanceLeaseLiabilityPaymentsDueAfterYearFive Thereafter, finance leases dei_LocalPhoneNumber Local Phone Number Organization, Consolidation and Presentation of Financial Statements Disclosure and Significant Accounting Policies [Text Block] us-gaap_FinanceLeaseLiabilityUndiscountedExcessAmount Less amount representing interest, finance leases Issuance of common stock upon exercise of stock options (in shares) Stock Purchase Plan [Member] Represents the stock purchase plan. us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity Line of Credit Facility, Remaining Borrowing Capacity us-gaap_FinanceLeaseLiabilityPaymentsDueNextTwelveMonths 2024, finance leases us-gaap_TableTextBlock Notes Tables Stock Issued to Outside Directors [Member] Type of share-based compensation to outside directors. us-gaap_FinanceLeaseLiabilityPaymentsDueYearTwo 2025, finance leases us-gaap_FinanceLeaseLiabilityPaymentsDueYearThree 2026, finance leases Issuance of common stock for employee stock purchase plan us-gaap_GainLossOnDispositionOfAssets1 (Gain) loss from disposals of property & equipment us-gaap_FinanceLeaseLiabilityPaymentsDueYearFour 2027, finance leases us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity Line of Credit Facility, Maximum Borrowing Capacity Issuance of common stock upon exercise of stock options Accounting Standards Update and Change in Accounting Principle [Text Block] Related and Nonrelated Parties [Axis] us-gaap_FinanceLeaseWeightedAverageDiscountRatePercent Finance Lease, Weighted Average Discount Rate, Percent Related and Nonrelated Parties [Domain] Management Services [Member] Represents management services. Soft Pretzels [Member] Type of food service sales to external customers. Frozen Juices and Ices [Member] Type of food service sales. Churros [Member] Type of food service sales. Handhelds [Member] Type of food service sales. Bakery [Member] Type of food service sales. us-gaap_FinanceLeaseWeightedAverageRemainingLeaseTerm1 Finance Lease, Weighted Average Remaining Lease Term Food Service [Member] Represents the Food Service segment. Financing activities: us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares) Other long-term liabilities Marketing Equipment parts and other Other Products [Member] Type of food service sales. Retail Supermarket [Member] Represents the Retail Supermarket segment. Raw materials Packaging materials us-gaap_LiabilitiesAndStockholdersEquity Total Liabilities and Stockholders' Equity Finished goods Related Party Transaction [Axis] Related Party Transaction [Domain] Beverage [Member] Type of food service sales. 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 Balance at March 30, 2024 Total stockholders' equity Balance Balance 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] Class of Stock [Axis] Additions to contract liability The amount of additions to contract with customer liability. Long-term debt us-gaap_DeferredIncomeTaxesAndTaxCredits Deferred income taxes Total operating lease liabilities Present value of lease obligations, operating leases Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] us-gaap_PaymentsToAcquireBusinessesGross Payments to Acquire Businesses, Gross 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 2026, operating leases us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFour 2027, operating leases Finance lease right-of-use assets in Property, plant and equipment, net us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFive 2028, operating leases us-gaap_FinanceLeaseRightOfUseAssetStatementOfFinancialPositionExtensibleList Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration] us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive Thereafter, operating leases