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Note A - Summary of Significant Accounting Policies (Details Textual)
12 Months Ended
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.