Other Financial Information - Schedule of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 26, 2025	Sep. 27, 2024
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance at the beginning of the period	$ 4,567,303	$ 6,600,082
Balance at the end of the period	3,647,905	4,567,303
Foreign currency translation adjustment	(1,000)	(8,900)
Interest rate and cross currency swaps to be reclassified during the next 12 months	6,200	5,900
Total
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance at the beginning of the period	(699,450)	(857,954)
Other comprehensive (loss) income	(3,324)	158,346
Reclassifications from other comprehensive income (loss)	(7,636)	(54,314)
Distribution of SpinCo Business		54,472
Balance at the end of the period	(710,410)	(699,450)
Change in Pension and Retiree Medical Plan Liabilities
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance at the beginning of the period	(370,937)	(325,692)
Other comprehensive (loss) income	(2,198)	(45,190)
Reclassifications from other comprehensive income (loss)	225	192
Distribution of SpinCo Business		(247)
Balance at the end of the period	(372,910)	(370,937)
Foreign Currency Translation Adjustment
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance at the beginning of the period	(369,516)	(635,937)
Other comprehensive (loss) income	(4,453)	211,702
Reclassifications from other comprehensive income (loss)	0	0
Distribution of SpinCo Business		54,719
Balance at the end of the period	(373,969)	(369,516)
Gain/(Loss) on Cash Flow Hedges
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance at the beginning of the period	41,003	103,675
Other comprehensive (loss) income	3,327	(8,166)
Reclassifications from other comprehensive income (loss)	(7,861)	(54,506)
Distribution of SpinCo Business		0
Balance at the end of the period	$ 36,469	$ 41,003