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Pension and Other Postretirement Benefit Plans - Schedule of Pension Plans' Expense (Details) - USD ($)
$ in Thousands
 3 Months Ended
Dec. 27, 2019
Dec. 28, 2018
Component:    
Service cost $ 1,465 $ 2,489
Interest cost 13,031 15,142
Expected return on plan assets (27,665) (24,837)
Amortization of previously unrecognized items 3,110 2,400
Plan Amendment and settlement loss (gain) 2,651 1,363
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Total $ (7,408) $ (3,443)