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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
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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