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Pension and Other Postretirement Benefit Plans - Schedule of Pension Plans' Expense (Details) - USD ($)
$ in Thousands
3 Months Ended
Jan. 01, 2021
Dec. 27, 2019
Component:    
Service cost $ 1,735 $ 1,465
Interest cost 11,785 13,031
Expected return on plan assets (25,427) (27,665)
Amortization of previously unrecognized items 4,032 3,110
Plan Amendment and settlement loss (gain) 0 2,651
Net periodic benefit cost $ (7,875) $ (7,408)