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Note A - Summary of Significant Accounting Policies (Details Textual) | 12 Months Ended |  |
--- | --- | --- | ---
Sep. 28, 2019 USD ($) shares | Sep. 29, 2018 USD ($) shares | Sep. 30, 2017 USD ($) shares | Sep. 29, 2019 USD ($) | Jun. 29, 2019 USD ($)
Liability for Allowances, End-user Pricing Adjustments and Trade Spending | $ 14,800,000 | $ 13,600,000 |  |  |
Accounts Receivable, Allowance for Credit Loss, Ending Balance | 572,000 | 400,000 |  |  | $ 665,000
Cash, Uninsured Amount | 21,000,000 |  |  |  |
Cash, FDIC Insured Amount | 250,000 |  |  |  |
Accounts Receivable, after Allowance for Credit Loss, Total | $ 140,938,000 | 132,342,000 |  |  |
Employees Covered Under Collective Bargaining Agreement, Percentage | 27.00% |  |  |  |
Unrecognized Tax Benefits, Ending Balance | $ 414,000 | 394,000 |  |  |
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued, Total | $ 279,000 | 259,000 |  |  |
Income Tax Expense (Benefit), Continuing Operations, Adjustment of Deferred Tax (Asset) Liability |  | (20,700,000) |  |  |
Income Tax Expense (Benefit), Continuing Operations, Changed in Tax Rate, Tax Cut and Jobs Act |  | (8,800,000) |  |  |
Effective Income Tax Rate Reconciliation, Repatriation of Foreign Earnings, Amount |  | $ 1,200,000 | $ 0 |  |
Effective Income Tax Rate Reconciliation, Percent, Total | 25.80% | 27.70% |  |  |
Effective Income Tax Rate Reconciliation, Changed in Prior Tax for Repatriation of Foreign Earnings, Amount | $ (885,000) |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount | shares | 162,070 | 1,000 | 157,994 |  |
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total | $ 7,800,000 |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate | 17.20% | 17.40% | 16.60% |  |
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate | 2.10% | 2.70% | 2.00% |  |
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate | 1.20% | 1.30% | 1.30% |  |
Share-based Compensation Arrangement by Share-based Payment Award Fair Value Assumptions Expected Forfeiture Rate | 8.00% | 10.00% | 13.00% |  |
Advertising Expense | $ 5,938,000 | $ 5,805,000 | $ 6,095,000 |  |
Unrecorded Unconditional Purchase Obligation, Total | 100,000,000 |  |  |  |
Research and Development Expense, Total | $ 645,000 | 623,000 | $ 674,000 |  |
Accounting Standards Update 2016-02 [Member] | Subsequent Event [Member] |  |  |  |  |
Operating Lease, Right-of-Use Asset |  |  |  | $ 65,000,000 |
Operating Lease, Liability, Total |  |  |  | $ 18,000,000 |
Ten Year Options [Member] |  |  |  |  |
Expected Volatility Term | 10 years |  |  |  |
New Jersey Division of Taxation [Member] | State and Local Jurisdiction [Member] |  |  |  |  |
Income Tax Expense (Benefit), Continuing Operations, Adjustment of Deferred Tax (Asset) Liability |  | $ 1,400,000 |  |  |
Revenue Benchmark [Member] | Customer Concentration Risk [Member] |  |  |  |  |
Number of Major Customers | 10 |  |  |  |
Minimum [Member] |  |  |  |  |
Finite-Lived Intangible Asset, Useful Life | 2 years |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term | 5 years | 5 years | 5 years |  |
Minimum [Member] | 5 year options [Member] |  |  |  |  |
Expected Volatility Term | 49 months |  |  |  |
Maximum [Member] |  |  |  |  |
Finite-Lived Intangible Asset, Useful Life | 20 years |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term | 10 years | 10 years | 10 years |  |
Maximum [Member] | 5 year options [Member] |  |  |  |  |
Expected Volatility Term | 51 months |  |  |  |
Customer Group One [Member] |  |  |  |  |
Approximate Number of Customers | 15 |  |  |  |
Customer Group One [Member] | Minimum [Member] |  |  |  |  |
Accounts Receivable, after Allowance for Credit Loss, Total | $ 1,000,000 |  |  |  |
Customer Group One [Member] | Maximum [Member] |  |  |  |  |
Accounts Receivable, after Allowance for Credit Loss, Total | $ 10,000,000 |  |  |  |
Top Ten Customers [Member] | Revenue Benchmark [Member] | Customer Concentration Risk [Member] |  |  |  |  |
Concentration Risk, Percentage | 43.00% | 43.00% | 42.00% |  |
Largest Customer [Member] | Revenue Benchmark [Member] | Customer Concentration Risk [Member] |  |  |  |  |
Concentration Risk, Percentage | 11.00% | 9.50% | 9.50% |  |

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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_MajorCustomersAxis=jjsf_CustomerGroupOneMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_MajorCustomersAxis=jjsf_TopTenCustomersMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |