Pension and Other Postretirement Benefit Plans - Schedule of Pension Plans' Expense (Details) - USD ($) $ in Thousands	3 Months Ended
	Dec. 30, 2022	Dec. 31, 2021
Component:
Service cost	$ 1,748	$ 1,709
Interest cost	20,233	13,784
Expected return on plan assets	(21,091)	(23,263)
Amortization of previously unrecognized items	1,304	3,092
Net periodic benefit cost	$ 2,194	$ (4,678)