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Note A - Summary of Significant Accounting Policies (Details Textual) | 12 Months Ended
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Sep. 29, 2018 USD ($) shares | Sep. 30, 2017 USD ($) shares | Sep. 24, 2016 USD ($) shares
Liability for Allowances, End-user Pricing Adjustments and Trade Spending |  | $ 13,600,000 | $ 13,000,000 |
Distribution | [1] | 92,281,000 | 81,824,000 | $ 73,114,000
Cash, Uninsured Amount |  | 35,000,000 |  |
Cash, FDIC Insured Amount |  | 250,000 |  |
Accounts Receivable, Net, Total |  | $ 132,342,000 | 124,553,000 |
Employees Covered Under Collective Bargaining Agreement, Percentage |  | 27.00% |  |
Allowance for Doubtful Accounts Receivable, Ending Balance |  | $ 400,000 | 359,000 |
Unrecognized Tax Benefits, Ending Balance |  | 394,000 | 374,000 |
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued, Total |  | 259,000 | 239,000 |
Income Tax Expense (Benefit), Continuing Operations, Adjustment of Deferred Tax (Asset) Liability |  | (20,900,000) |  |
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 |  |
Effective Income Tax Rate Reconciliation, Percent, Total |  | 27.80% | 35.20% |
Employee Service Share-based Compensation, Tax Benefit from Compensation Expense |  | $ 1,935,000 | $ 3,061,000 | $ 1,980,000
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount | shares |  | 1,000 | 157,994 | 180,170
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Total |  | $ 6,300,000 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate |  | 17.40% | 16.60% | 16.70%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate |  | 2.70% | 2.00% | 1.30%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate |  | 1.30% | 1.30% | 1.40%
Share-based Compensation Arrangement by Share-based Payment Award Fair Value Assumptions Expected Forfeiture Rate |  | 10.00% | 13.00% | 19.00%
Advertising Expense |  | $ 5,176,000 | $ 5,677,000 | $ 4,870,000
Commodity Futures Contracts and Spot Commodities, Proprietary Capital Charges |  | 77,000,000 |  |
Research and Development Expense, Total |  | 623,000 | 674,000 | 525,000
Income Tax Examination, Penalties and Interest Expense, Total |  | $ 0 | 0 |
Ten Year Options [Member] |  |  |  |
Expected Volatility Term |  | 10 years |  |
Early Adoption of ASU 2016-09 [Member] |  |  |  |
Employee Service Share-based Compensation, Tax Benefit from Compensation Expense |  | $ 821,000 | $ 1,497,000 | $ 885,000
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 |  |
Sales Revenue, Goods, Net [Member] | Customer Concentration Risk [Member] |  |  |  |
Concentration Risk, Percentage |  | 43.00% | 42.00% | 42.00%
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 |  |
Minimum [Member] | 5 year options [Member] |  |  |  |
Expected Volatility Term |  | 4 years 30 days |  |
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 |  |
Maximum [Member] | 5 year options [Member] |  |  |  |
Expected Volatility Term |  | 4 years 90 days |  |
Customer Group One [Member] |  |  |  |
Approximate Number of Cusomters |  | 15 |  |
Customer Group One [Member] | Minimum [Member] |  |  |  |
Accounts Receivable, Net, Total |  | $ 1,000,000 |  |
Customer Group One [Member] | Maximum [Member] |  |  |  |
Accounts Receivable, Net, Total |  | $ 10,000,000 |  |
Largest Customer [Member] | Sales Revenue, Goods, Net [Member] | Customer Concentration Risk [Member] |  |  |  |
Concentration Risk, Percentage |  | 9.50% | 9.50% | 8.00%
Repair and Maintenance Service [Member] |  |  |  |
Revenue from Contract with Customer, Including Assessed Tax |  | $ 22,011,000 | $ 23,204,000 | $ 24,571,000
Deferred Revenue |  | 1,865,000 | 1,956,000 |
Deferred Revenue, Noncurrent |  | 159,000 | 210,000 |
Frozen Beverages [Member] | Repair and Maintenance Service Contracts [Member] |  |  |  |
Revenue from Contract with Customer, Including Assessed Tax |  | $ 22,474,000 | $ 23,489,000 | $ 24,664,000
[1] | Includes share-based compensation expense of $76 for the year ended September 29, 2018, $72 for the year ended September 30, 2017 and $48 for the year ended September 24, 2016.

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