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Note K - Stock-based Compensation (Details Textual) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Sep. 24, 2022
Sep. 25, 2021
Sep. 26, 2020
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year) 3 years    
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period (Year) 10 years    
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Authorized (in shares) 91,000    
Share-based Compensation Arrangement by Share-based Payment Award, Discount from Market Price, Offering Date 85.00%    
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercises in Period, Intrinsic Value $ 4,100 $ 6,000 $ 5,700
Proceeds from Stock Options Exercised 14,100 18,700 6,400
Share-Based Payment Arrangement, Exercise of Option, Tax Benefit $ 700 $ 1,200 $ 1,100
Employee Stock Purchase Plan [Member]      
Stock Issued During Period, Shares, Employee Stock Purchase Plans (in shares) 16,274 11,988 12,292
Share Price (in dollars per share) $ 124.94 $ 116.03 $ 121.62
Share-Based Payment Arrangement, Expense $ 300 $ 600 $ 400
Restricted Stock Units (RSUs) [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year) 3 years    
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Common Shares Issued Upon Vesting (in shares) 1    
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total $ 600    
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares) 9,200 0 0
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value (in dollars per share) $ 154.85    
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Remaining Contractual Term (Year) 2 years 1 month 6 days    
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value, Grants in Period $ 1,300    
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period (in shares) 0 0 0
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Forfeited in Period (in shares) 0 0 0
Restricted Stock Units (RSUs) [Member] | Vesting Every 12 Months [Member]      
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Rights, Percentage 33.00%    
Incentive Stock Options [Member]      
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value (in dollars per share) $ 23.36 $ 31.20 $ 14.43
Non-qualified Stock Options [Member]      
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value (in dollars per share) $ 23.36 $ 29.76 $ 14.32
Share-Based Payment Arrangement, Option [Member]      
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total $ 5,200    
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year) 3 years    
Performance Shares [Member]      
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total $ 0    
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares) 8,868 0 0
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value (in dollars per share) $ 155.01    
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Remaining Contractual Term (Year) 2 years 1 month 6 days    
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value, Grants in Period $ 1,200    
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period (in shares) 0 0 0
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Forfeited in Period (in shares) 0 0 0