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Note L - Stock Options - Stock Option Activity (Details) - $ / shares
 12 Months Ended
Sep. 30, 2017
Sep. 24, 2016
Sep. 26, 2015
Incentive Stock Options [Member]      
Balance (in shares) 355,787 332,352 295,645
Balance (in dollars per share) $ 92.81 $ 77.04 $ 60.83
Granted (in shares) 121,508 120,450 114,488
Granted (in dollars per share) $ 129.35 $ 108.69 $ 100.94
Exercised (in shares) (78,114) (86,223) (70,792)
Exercised (in dollars per share) $ 65.49 $ 53.67 $ 47.30
Canceled (in shares) (6,200) (10,792) (6,989)
Canceled (in dollars per share) $ 100.93 $ 97.07 $ 84.13
Balance (in shares) 392,981 355,787 332,352
Balance (in dollars per share) $ 109.41 $ 92.81 $ 77.04
Options exercisable (in shares) 51,719    
Exercisable options (in dollars per share) $ 81.54    
Non-qualified Stock Options [Member]      
Balance (in shares) 311,884 297,941 249,379
Balance (in dollars per share) $ 75.56 $ 63.34 $ 53.38
Granted (in shares) 59,786 58,720 55,152
Granted (in dollars per share) $ 129.94 $ 112.35 $ 106.96
Exercised (in shares) (60,156) (44,777) (6,590)
Exercised (in dollars per share) $ 41.46 $ 42.53 $ 51.14
Canceled (in shares)
Canceled (in dollars per share)
Balance (in shares) 311,514 311,884 297,941
Balance (in dollars per share) $ 92.58 $ 75.56 $ 63.34
Options exercisable (in shares) 137,856    
Exercisable options (in dollars per share) $ 62.21