Defined Benefit Pension Plans - Net Periodic Cost (Benefit) (Details) - Pension Plan - USD ($) $ in Thousands	12 Months Ended
	Sep. 25, 2022	Sep. 26, 2021	Sep. 27, 2020
Defined Benefit Plan Disclosure [Line Items]
Service cost for benefits earned during the year	$ 467	$ 2,529	$ 1,361
Interest cost on projected benefit obligation	7,941	7,147	7,577
Expected return on plan assets	(18,140)	(18,688)	(12,986)
Amortization of net (gain) loss	(3,320)	4,018	3,166
Amortization of prior service benefit	636	(6)	(6)
Settlement gain	(4,245)	0	0
Curtailment gain	(1,027)	0	0
Net periodic pension cost (benefit)	$ (17,688)	$ (5,000)	$ (888)