Benefit Plans - Amounts Recognized in Other Comprehensive Income (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 27, 2025	Sep. 28, 2024	Sep. 30, 2023
Defined Benefit Plan Disclosure [Line Items]
Net loss (gain)	$ (127,720)	$ (105,547)	$ (23,812)
Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Interest cost	5,249	5,936	6,035
Expected return on plan assets	(7,276)	(6,481)	(6,518)
Amortization of net loss	279	687	1,195
Net periodic benefit (income) expense	(1,748)	142	712
Net loss (gain)	2,688	(6,507)	(12,024)
Amortization of net loss	(279)	(687)	(1,195)
Total recognized in other comprehensive loss (income)	2,409	(7,194)	(13,219)
Total recognized in net periodic pension benefit (income) expense and other comprehensive loss (income)	$ 661	$ (7,052)	$ (12,507)