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Note K - Stock-based Compensation - Stock Options by Exercise Price Range (Details) - $ / shares
 12 Months Ended
Sep. 28, 2024
Sep. 30, 2023
Sep. 24, 2022
Sep. 25, 2021
Incentive Stock Options [Member]        
Options outstanding (in shares) 160,051 271,821 433,359 447,622
Options outstanding, weighted-average exercise price (in dollars per share) $ 144.49 $ 147.45 $ 146.98 $ 146.98
Exercisable Options (in shares) 82,376      
Exercisable Options, weighted-average exercise price (in dollars per share) $ 155.91      
Incentive Stock Options [Member] | Exercise Price Range 1 [Member]        
Range of exercise price, lower limit (in dollars per share) 125.83      
Range of exercise price, upper limit (in dollars per share) $ 153.04      
Options outstanding (in shares) 98,476      
Options outstanding, weighted-average remaining contractual life (Year) 2 years 3 months 18 days      
Options outstanding, weighted-average exercise price (in dollars per share) $ 131.14      
Exercisable Options (in shares) 20,801      
Exercisable Options, weighted-average exercise price (in dollars per share) $ 126.49      
Incentive Stock Options [Member] | Exercise Price Range 2 [Member]        
Range of exercise price, lower limit (in dollars per share) 165.56      
Range of exercise price, upper limit (in dollars per share) $ 192.13      
Options outstanding (in shares) 61,575      
Options outstanding, weighted-average remaining contractual life (Year) 1 year 7 months 6 days      
Options outstanding, weighted-average exercise price (in dollars per share) $ 165.85      
Exercisable Options (in shares) 61,575      
Exercisable Options, weighted-average exercise price (in dollars per share) $ 165.85      
Non-qualified Stock Options [Member]        
Options outstanding (in shares) 145,973 211,378 228,318 293,737
Options outstanding, weighted-average exercise price (in dollars per share) $ 145.01 $ 140.79 $ 132.29 $ 132.29
Exercisable Options (in shares) 137,448      
Exercisable Options, weighted-average exercise price (in dollars per share) $ 145.79      
Non-qualified Stock Options [Member] | Exercise Price Range 1 [Member]        
Range of exercise price, lower limit (in dollars per share) 117.85      
Range of exercise price, upper limit (in dollars per share) $ 132.38      
Options outstanding (in shares) 72,055      
Options outstanding, weighted-average remaining contractual life (Year) 2 years      
Options outstanding, weighted-average exercise price (in dollars per share) $ 124.13      
Exercisable Options (in shares) 63,530      
Exercisable Options, weighted-average exercise price (in dollars per share) $ 123.03      
Non-qualified Stock Options [Member] | Exercise Price Range 2 [Member]        
Range of exercise price, lower limit (in dollars per share) 150.89      
Range of exercise price, upper limit (in dollars per share) $ 191.4      
Options outstanding (in shares) 73,918      
Options outstanding, weighted-average remaining contractual life (Year) 4 years 7 months 6 days      
Options outstanding, weighted-average exercise price (in dollars per share) $ 165.36      
Exercisable Options (in shares) 73,918      
Exercisable Options, weighted-average exercise price (in dollars per share) $ 165.36