Note L - Stock Options - Stock Option Activity (Details) - $ / shares	12 Months Ended
	Sep. 26, 2020	Sep. 28, 2019	Sep. 29, 2018
Incentive Stock Options [Member]
Balance (in shares)	434,152	433,556	392,981
Balance, weighted average exercise price (in dollars per share)	$ 136.53	$ 120.90	$ 109.41
Granted (in shares)	124,414	118,934	122,595
Granted, weighted average exercise price (in dollars per share)	$ 126.33	$ 163.14	$ 141.07
Exercised (in shares)	(51,350)	(100,018)	(64,470)
Exercised, weighted average exercise price (in dollars per share)	$ 109.73	$ 102.01	$ 90.75
Canceled (in shares)	(36,796)	(18,320)	(17,550)
Canceled, weighted average exercise price (in dollars per share)	$ 138.34	$ 127.88	$ 115.21
Balance (in shares)	470,420	434,152	433,556
Balance, weighted average exercise price (in dollars per share)	$ 136.62	$ 136.53	$ 120.90
Exercisable options (in shares)	138,600
Exercisable Options, weighted average exercise price (in dollars per share)	$ 121.73
Non-qualified Stock Options [Member]
Balance (in shares)	362,742	332,269	311,514
Balance, weighted average exercise price (in dollars per share)	$ 118.19	$ 105.66	$ 92.58
Granted (in shares)	37,074	66,236	58,083
Granted, weighted average exercise price (in dollars per share)	$ 125.83	$ 171.78	$ 144.41
Exercised (in shares)	(24,182)	(35,763)	(37,328)
Exercised, weighted average exercise price (in dollars per share)	$ 53.43	$ 101.03	$ 56.85
Canceled (in shares)	(29,192)	0	0
Canceled, weighted average exercise price (in dollars per share)	$ 135.79	$ 0	$ 0
Balance (in shares)	346,442	362,742	332,269
Balance, weighted average exercise price (in dollars per share)	$ 122.04	$ 118.19	$ 105.66
Exercisable options (in shares)	180,725
Exercisable Options, weighted average exercise price (in dollars per share)	$ 97.36