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Pension and Other Postretirement Benefit Plans - Schedule of Pension Plans' Expense (Details) - USD ($)
$ in Thousands
 3 Months Ended
Dec. 31, 2021
Jan. 01, 2021
Component:    
Service cost $ 1,709 $ 1,735
Interest cost 13,784 11,785
Expected return on plan assets (23,263) (25,427)
Amortization of previously unrecognized items 3,092 4,032
Net periodic benefit cost $ (4,678) $ (7,875)