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Pension and Other Postretirement Benefit Plans - Schedule of Pension Plans' Expense (Details) - USD ($)
$ in Thousands
 3 Months Ended
Dec. 27, 2024
Dec. 29, 2023
Component:    
Service cost $ 2,499 $ 2,261
Interest cost 20,402 21,560
Expected return on plan assets (24,687) (23,726)
Amortization of previously unrecognized items 3,002 1,949
Total net periodic pension benefit expense recognized $ 1,216 $ 2,044