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Note A - Summary of Significant Accounting Policies (Details Textual)	12 Months Ended
	Sep. 25, 2021 USD ($) shares	Sep. 26, 2020 USD ($) shares	Sep. 28, 2019 USD ($) shares
Contract with Customer, Asset, Allowance for Deductions	$ 14,600,000	$ 14,300,000
Accounts Receivable, Allowance for Credit Loss, Ending Balance	1,405,000	1,388,000
Cash, Uninsured Amount	123,000,000
Accounts Receivable, after Allowance for Credit Loss, Total	$ 162,939,000	126,587,000
Employees Covered Under Collective Bargaining Agreement, Percentage	27.00%
Unrecognized Tax Benefits, Ending Balance	$ 343,000	360,000
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued, Total	267,000	267,000
Effective Income Tax Rate Reconciliation, Repatriation of Foreign Earnings, Amount	$ (0)	$ (0)	$ 885,000
Effective Income Tax Rate Reconciliation, Percent, Total	24.90%	25.00%	25.80%
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	284,480	341,849	162,070
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total	$ 6,600,000
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)	3 years
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate	25.80%	17.40%	17.20%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate	0.80%	0.30%	2.10%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate	1.40%	1.80%	1.20%
Advertising Expense	$ 4,885,000	$ 6,461,000	$ 5,938,000
Unrecorded Unconditional Purchase Obligation, Total	78,000,000
Research and Development Expense, Total	619,000	680,000	$ 645,000
Operating Lease, Right-of-Use Asset	54,555,000	58,110,000
Operating Lease, Liability, Total	59,952,000	$ 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
Five Year Options [Member]
Share Based Compensation Arrangement by Share Based Payment Award Fair Value Assumptions Volatility Calculation Term (Year)	51 years
Ten Year Options [Member]
Share Based Compensation Arrangement by Share Based Payment Award Fair Value Assumptions Volatility Calculation Term (Year)	10 years
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)	4 years
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
Customer Group One [Member]
Approximate Number of Customers	28
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	$ 14,000,000
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	11.00%	13.00%	11.00%

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