Pension Plans and Other Postretirement Benefits - Components of Net Periodic Benefit Costs (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 30, 2024	Mar. 25, 2023	Mar. 30, 2024	Mar. 25, 2023
Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Interest cost	$ 804	$ 826	$ 1,609	$ 1,653
Expected return on plan assets	(314)	(338)	(629)	(677)
Amortization of net loss	426	481	851	963
Net periodic benefit cost	916	969	1,831	1,939
Postretirement Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Interest cost	36	42	72	83
Amortization of prior service credits	(65)	(125)	(130)	(249)
Amortization of net loss	(192)	(193)	(383)	(387)
Net periodic benefit cost	$ (221)	$ (276)	$ (441)	$ (553)