Defined Benefit Pension Plans - Net Periodic Cost (Benefit) (Details) - Pension Plan - USD ($) $ in Thousands	12 Months Ended
	Sep. 24, 2023	Sep. 25, 2022	Sep. 26, 2021
Defined Benefit Plan Disclosure [Line Items]
Service cost for benefits earned during the year	$ 19	$ 488	$ 2,529
Interest cost on projected benefit obligation	10,368	7,999	7,147
Expected return on plan assets	(10,192)	(18,261)	(18,688)
Amortization of net (gain) loss	10	(3,317)	4,018
Amortization of prior service benefit	852	641	(6)
Settlement gain	0	(4,245)	0
Curtailment gain	0	(1,027)	0
Net periodic pension cost (benefit)	$ 1,057	$ (17,722)	$ (5,000)