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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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