Postretirement and Postemployment Benefits - Net Period Postretirement Cost (Benefit) Components for Postretirement Plans (Details) - Postemployment Retirement Benefits - USD ($) $ in Thousands	12 Months Ended
	Sep. 25, 2022	Sep. 26, 2021	Sep. 27, 2020
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service cost for benefits earned during the year	$ 108	$ 207	$ 500
Interest cost on projected benefit obligation	340	429	869
Expected return on plan assets	(1,053)	(1,007)	(1,060)
Amortization of net (gain) loss	(994)	(685)	(743)
Amortization of prior service benefit	(647)	(647)	(647)
Curtailment gains	0	(23,830)	0
Net periodic pension cost (benefit)	$ (2,246)	$ (25,533)	$ (1,081)