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Note L - Stock Options - Incentive Stock Options by Excercise Price Range (Details) - Incentive Stock Options [Member] - $ / shares
 12 Months Ended
Sep. 30, 2017
Sep. 24, 2016
Sep. 26, 2015
Sep. 27, 2014
Options outstanding (in shares) 392,981 355,787 332,352 295,645
Options outstanding, weighted-average remaining contractual life (Year) 3 years 36 days      
Options outstanding, weighted-average exercise price (in dollars per share) $ 109.41 $ 92.81 $ 77.04 $ 60.83
Options exercisable (in shares) 51,719      
Options exercisable, weighted-average exercise price (in dollars per share) $ 81.54      
Exercise Price Range 1 [Member]        
Range of exercise price, lower limit (in dollars per share) 57.15      
Range of exercise price, upper limit (in dollars per share) $ 81.67      
Options outstanding (in shares) 51,219      
Options outstanding, weighted-average remaining contractual life (Year) 1 year 36 days      
Options outstanding, weighted-average exercise price (in dollars per share) $ 81.43      
Options exercisable (in shares) 51,219      
Options exercisable, weighted-average exercise price (in dollars per share) $ 81.43      
Exercise Price Range 2 [Member]        
Range of exercise price, lower limit (in dollars per share) 93.17      
Range of exercise price, upper limit (in dollars per share) $ 137.16      
Options outstanding (in shares) 341,762      
Options outstanding, weighted-average remaining contractual life (Year) 3 years 146 days      
Options outstanding, weighted-average exercise price (in dollars per share) $ 113.60      
Options exercisable (in shares) 500      
Options exercisable, weighted-average exercise price (in dollars per share) $ 93.17