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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. 27, 2025
Jun. 28, 2024
Jun. 27, 2025
Jun. 28, 2024
Component:        
Service cost $ 2,499 $ 2,261 $ 7,494 $ 6,783
Interest cost 21,571 21,560 62,657 64,680
Expected return on plan assets (26,149) (23,726) (75,877) (71,178)
Amortization of previously unrecognized items 3,181 1,949 9,228 5,847
Total net periodic pension benefit expense recognized $ 1,102 $ 2,044 $ 3,502 $ 6,132