Pension Plans and Other Postretirement Benefits - Components of Net Periodic Benefit Costs (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 29, 2024	Jun. 24, 2023	Jun. 29, 2024	Jun. 24, 2023
Defined Benefit Plan Disclosure [Line Items]
Pension settlement charge			$ (550)	$ 0
Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Interest cost	$ 805	$ 827	2,414	2,480
Expected return on plan assets	(314)	(339)	(943)	(1,016)
Amortization of net loss (gain)	425	482	1,276	1,445
Pension settlement charge	550	0	550	0
Net periodic benefit cost	1,466	970	3,297	2,909
Postretirement Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Interest cost	35	41	107	124
Amortization of prior service credits	(64)	(124)	(194)	(373)
Amortization of net loss (gain)	(192)	(194)	(575)	(581)
Net periodic benefit cost	$ (221)	$ (277)	$ (662)	$ (830)