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Note L - Stock Options (Details Textual) - USD ($)	12 Months Ended
	Sep. 26, 2020	Sep. 28, 2019	Sep. 29, 2018
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year)	3 years
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period (Year)	10 years
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized (in shares)	454,000
Share-based Compensation Arrangement by Share-based Payment Award, Discount from Market Price, Offering Date	85.00%
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value	$ 5,700,000	$ 9,400,000	$ 6,800,000
Proceeds from Stock Options Exercised	6,400,000	12,700,000	7,400,000
Share-based Payment Arrangement, Exercise of Option, Tax Benefit	$ 1,100,000	$ 1,800,000	$ 1,700,000
Incentive Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value (in dollars per share)	$ 14.43	$ 26.29	$ 23.68
Non-qualified Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value (in dollars per share)	$ 14.32	$ 33.11	$ 31.44
Employee Stock Purchase Plan [Member]
Stock Issued During Period, Shares, Employee Stock Purchase Plans (in shares)	12,292	12,492	12,763
Share Price (in dollars per share)	$ 121.62	$ 121.37	$ 119.39
Share-based Payment Arrangement, Expense	$ 390,000	$ 390,000	$ 423,000

X

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Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

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