Postretirement and Postemployment Benefits - Net Period Postretirement Cost (Benefit) Components for Postretirement Plans (Details) - Postemployment Retirement Benefits - USD ($) $ in Thousands	12 Months Ended
	Sep. 24, 2023	Sep. 25, 2022	Sep. 26, 2021
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service cost for benefits earned during the year	$ 68	$ 108	$ 207
Interest cost on projected benefit obligation	598	340	429
Expected return on plan assets	(1,182)	(1,053)	(1,007)
Amortization of net (gain) loss	(1,014)	(994)	(685)
Amortization of prior service benefit	(647)	(647)	(647)
Curtailment gains	0	0	(23,830)
Net periodic pension cost (benefit)	$ (2,177)	$ (2,246)	$ (25,533)