Note K - Stock-based Compensation - Incentive Stock Options by Exercise Price Range (Details) - $ / shares			12 Months Ended
	Sep. 30, 2023	Sep. 24, 2022	Sep. 30, 2023	Sep. 25, 2021	Sep. 26, 2020
Incentive Stock Options [Member]
Options outstanding (in shares)	271,821	433,359	271,821	447,622	470,420
Options outstanding, weighted-average exercise price (in dollars per share)	$ 147.45	$ 146.98	$ 147.45	$ 146.98	$ 136.62
Exercisable Options (in shares)	102,158		102,158
Exercisable Options, weighted-average exercise price (in dollars per share)	$ 145.91		$ 145.91
Incentive Stock Options [Member] | Exercise Price Range 1 [Member]
Range of exercise price, lower limit (in dollars per share)		125.83
Share-Based Payment Arrangement, Option, Exercise Price Range, Lower Range Limit		125.83
Range of exercise price, upper limit (in dollars per share)			$ 158.97
Options outstanding (in shares)	136,548		136,548
Options oustanding, weighted-average remaining contractual life (Year)			3 years
Options outstanding, weighted-average exercise price (in dollars per share)	$ 130.26		$ 130.26
Exercisable Options (in shares)	48,508		48,508
Exercisable Options, weighted-average exercise price (in dollars per share)	$ 126.27		$ 126.27
Incentive Stock Options [Member] | Exercise Price Range 2 [Member]
Range of exercise price, lower limit (in dollars per share)		163.29
Share-Based Payment Arrangement, Option, Exercise Price Range, Lower Range Limit		$ 163.29
Range of exercise price, upper limit (in dollars per share)			$ 192.13
Options outstanding (in shares)	135,273		135,273
Options oustanding, weighted-average remaining contractual life (Year)			1 year 9 months 18 days
Options outstanding, weighted-average exercise price (in dollars per share)	$ 164.81		$ 164.81
Exercisable Options (in shares)	53,650		53,650
Exercisable Options, weighted-average exercise price (in dollars per share)	$ 163.67		$ 163.67
Non-qualified Stock Options [Member]
Options outstanding (in shares)	211,378	228,318	211,378	293,737	346,442
Options outstanding, weighted-average exercise price (in dollars per share)	$ 140.79	$ 132.29	$ 140.79	$ 132.29	$ 122.04
Exercisable Options (in shares)	161,128		161,128
Exercisable Options, weighted-average exercise price (in dollars per share)	$ 136.55		$ 136.55
Non-qualified Stock Options [Member] | Exercise Price Range 1 [Member]
Range of exercise price, lower limit (in dollars per share)	94.24
Share-Based Payment Arrangement, Option, Exercise Price Range, Lower Range Limit	$ 94.24
Range of exercise price, upper limit (in dollars per share)			$ 119.44
Options outstanding (in shares)	60,000		60,000
Options oustanding, weighted-average remaining contractual life (Year)			2 years
Options outstanding, weighted-average exercise price (in dollars per share)	$ 110.51		$ 110.51
Exercisable Options (in shares)	60,000		60,000
Exercisable Options, weighted-average exercise price (in dollars per share)	$ 110.51		$ 110.51
Non-qualified Stock Options [Member] | Exercise Price Range 2 [Member]
Range of exercise price, lower limit (in dollars per share)	125.83
Share-Based Payment Arrangement, Option, Exercise Price Range, Lower Range Limit	$ 125.83
Range of exercise price, upper limit (in dollars per share)			$ 153.65
Options outstanding (in shares)	91,544		91,544
Options oustanding, weighted-average remaining contractual life (Year)			4 years 6 months
Options outstanding, weighted-average exercise price (in dollars per share)	$ 139.28		$ 139.28
Exercisable Options (in shares)	61,784		61,784
Exercisable Options, weighted-average exercise price (in dollars per share)	$ 135.71		$ 135.71
Non-qualified Stock Options [Member] | Exercise Price Range 3 [Member]
Range of exercise price, lower limit (in dollars per share)		163.29
Share-Based Payment Arrangement, Option, Exercise Price Range, Lower Range Limit		$ 163.29
Range of exercise price, upper limit (in dollars per share)			$ 191.4
Options outstanding (in shares)	59,834		59,834
Options oustanding, weighted-average remaining contractual life (Year)			3 years 1 month 6 days
Options outstanding, weighted-average exercise price (in dollars per share)	$ 173.46		$ 173.46
Exercisable Options (in shares)	39,344		39,344
Exercisable Options, weighted-average exercise price (in dollars per share)	$ 177.58		$ 177.58