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Note K - Stock-based Compensation (Details Textual) - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended
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Sep. 30, 2023 | Sep. 24, 2022 | Sep. 25, 2021
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) | 462,000 |  |
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 | $ 2.1 | $ 4.1 | $ 6.0
Proceeds from Stock Options Exercised | 13.1 | 14.1 | 18.7
Share-Based Payment Arrangement, Exercise of Option, Tax Benefit | 0.1 | $ 0.7 | $ 1.2
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) |  | $ 23.36 | $ 31.2
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) |  | $ 23.36 | $ 29.76
Share-Based Payment Arrangement, Option [Member] |  |  |
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount | $ 2.1 |  |
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year) | 3 years |  |
Restricted Stock Units (RSUs) [Member] |  |  |
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount | $ 2.5 |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period (in shares) | 3,165 | (0) | 0
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares) | 21,864 | 9,200 | 0
Performance Shares [Member] |  |  |
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount | $ 2.4 |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares) | 21,260 | 8,868 |
Employee Stock Purchase Plan [Member] |  |  |
Stock Issued During Period, Shares, Employee Stock Purchase Plans (in shares) | 17,231 | 16,274 | 11,988
Share Price (in dollars per share) | $ 121.53 | $ 124.94 | $ 116.03
Share-Based Payment Arrangement, Expense | $ 0.6 | $ 0.3 | $ 0.6

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- Definition Amount of expense for award under share-based payment arrangement. Excludes amount capitalized. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479830/718-10-S99-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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