Income Taxes - Schedule of Components of Net Deferred Tax Assets (Details) - USD ($) $ in Thousands	Sep. 26, 2025	Sep. 27, 2024
Deferred tax assets:
Other employee benefit plans	$ 112,906	$ 110,377
Net operating losses	207,377	259,335
Foreign tax credit	38,989	42,394
Capitalized research costs	184,394	112,652
Lease liability	78,386	93,488
Unrealized foreign exchange loss	11,244	11,891
Other	32,693	10,178
Valuation allowance	(193,050)	(217,397)
Gross deferred tax assets	472,939	422,918
Deferred tax liabilities:
Depreciation and amortization	(211,627)	(243,234)
Lease right of use asset	(37,078)	(41,817)
Defined benefit pension plans	(16,102)	(4,540)
Hedge investments	(12,259)	(13,862)
Unrealized foreign exchange gain	(947)	(12,598)
Other	(20,933)	(28,116)
Gross deferred tax liabilities	(298,946)	(344,167)
Net deferred tax assets	$ 173,993	$ 78,751