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Pension and Other Postretirement Benefit Plans - Schedule of Pension Plans' Expense (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Jun. 30, 2023
Jul. 01, 2022
Jun. 30, 2023
Jul. 01, 2022
Component:        
Service cost $ 1,748 $ 1,709 $ 5,244 $ 5,127
Interest cost 20,233 13,784 60,699 41,352
Expected return on plan assets (21,091) (23,263) (63,273) (69,789)
Amortization of previously unrecognized items 1,304 3,092 3,912 9,276
Total net periodic pension benefit expense/(income) recognized $ 2,194 $ (4,678) $ 6,582 $ (14,034)