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Pension and Other Postretirement Benefit Plans - Schedule of Pension Plans' Expense (Details) - USD ($)
$ in Thousands
1 Months Ended 3 Months Ended
Dec. 31, 2017
Dec. 28, 2018
Dec. 29, 2017
Component:      
Service cost   $ 2,489 $ 2,281
Interest cost   15,142 15,424
Expected return on plan assets   (24,837) (25,073)
Amortization of previously unrecognized items   2,400 2,290
Plan Amendment and settlement loss (gain) $ 3,800 1,363 3,819
Net periodic benefit   $ (3,443) $ (1,259)