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Income Taxes (Summary Of Tax Effects Of The Temporary Differences Between Carrying Amounts And Amounts Used For Tax) (Details) - USD ($) $ in Thousands | Sep. 26, 2025 | Sep. 27, 2024
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Income Tax Disclosure [Abstract] |  |
Investments | $ 5,435 | $ 7,410
Inventories | 3,195 | 5,359
Net operating loss | 1,426 | 2,294
Accrued expenses | 14,427 | 13,245
Stock-based compensation | 17,483 | 17,223
Revenue recognition | 3,000 | 4,394
Depreciation and amortization | 142,408 | 139,228
Lease liability | 7,675 | 15,657
Research and development credits | 42,488 | 47,830
Foreign tax credits | 20,565 | 28,777
Deferred Tax Assets, Unrealized Currency Losses | 14,587 | 9,881
Other | 3,648 | 6,067
Total gross deferred income tax assets | 276,337 | 297,365
Less: valuation allowance | (51,015) | (56,922)
Total deferred income tax assets | 225,322 | 240,443
Right of use asset | (4,981) | (15,889)
Intangibles | (5,980) | (4,796)
Deferred income tax assets, net | 214,361 | $ 219,758
Net operating loss carryforwards | 5,000 |
Deferred Tax Assets, Tax Credit Carryforwards, Research | $ 28,800 |

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