Note A - Summary of Significant Accounting Policies (Details Textual)	12 Months Ended
	Sep. 26, 2020 USD ($) shares	Sep. 28, 2019 USD ($) shares	Sep. 29, 2018 USD ($) shares	Sep. 29, 2019 USD ($)
Liability for Allowances, End-user Pricing Adjustments and Trade Spending	$ 14,300,000	$ 14,800,000
Accounts Receivable, Allowance for Credit Loss, Ending Balance	1,388,000	572,000
Cash, Uninsured Amount	40,000,000
Accounts Receivable, after Allowance for Credit Loss, Total	$ 126,587,000	140,938,000
Employees Covered Under Collective Bargaining Agreement, Percentage	28.00%
Unrecognized Tax Benefits, Ending Balance	$ 360,000	414,000
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued, Total	267,000	279,000
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense, Total	12,000	$ 0
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	$ 0		$ 1,200,000
Effective Income Tax Rate Reconciliation, Percent, Total	25.00%	25.80%	27.70%
Effective Income Tax Rate Reconciliation, Changed in Prior Tax for Repatriation of Foreign Earnings, Amount		$ (885,000)
Effective Income Tax Rate Reconciliation, State Deferred Taxes and Provision to Return Adjustment, Amount	$ 2,200,000
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount (in shares) | shares	341,849	162,070	1,000
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total	$ 5,600,000
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate	17.40%	17.20%	17.40%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate	3.00%	2.10%	2.70%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate	1.80%	1.20%	1.30%
Share-based Compensation Arrangement by Share-based Payment Award Fair Value Assumptions Expected Forfeiture Rate	8.00%	8.00%	10.00%
Advertising Expense	$ 6,461,000	$ 5,938,000	$ 5,805,000
Unrecorded Unconditional Purchase Obligation, Total	75,000,000
Research and Development Expense, Total	680,000	645,000	623,000
Operating Lease, Right-of-Use Asset	58,110,000	$ 0
Operating Lease, Liability, Total	$ 60,861,000
Accounting Standards Update 2016-02 [Member]
Operating Lease, Right-of-Use Asset				$ 71,000,000
Operating Lease, Liability, Total				$ 72,000,000
Ten Year Options [Member]
Expected Volatility Term (Month)	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	10	10
Minimum [Member]
Finite-Lived Intangible Asset, Useful Life (Year)	2 years
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term (Year)	5 years
Minimum [Member] | 5 year options [Member]
Expected Volatility Term (Month)	49 months
Maximum [Member]
Finite-Lived Intangible Asset, Useful Life (Year)	20 years
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term (Year)	10 years
Maximum [Member] | 5 year options [Member]
Expected Volatility Term (Month)	51 months
Customer Group One [Member]
Approximate Number of Customers	16
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
One Customer [Member]
Accounts Receivable, after Allowance for Credit Loss, Total	$ 15,000,000
Top Ten Customers [Member] | Revenue Benchmark [Member] | Customer Concentration Risk [Member]
Concentration Risk, Percentage	43.00%	43.00%	43.00%
Largest Customer [Member] | Revenue Benchmark [Member] | Customer Concentration Risk [Member]
Concentration Risk, Percentage	13.00%	11.00%	9.50%