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Employee Benefit Plans - Components of Net Periodic Benefit Costs (Details) - USD ($)
$ in Thousands
 12 Months Ended
Sep. 28, 2024
Sep. 30, 2023
Sep. 24, 2022
Components of net periodic benefit costs included in operating expenses [Abstract]      
Settlement charge $ 638 $ 0 $ 840
Pension Benefits [Member]      
Components of net periodic benefit costs included in operating expenses [Abstract]      
Interest cost 3,129 3,306 2,459
Expected return on plan assets (1,260) (1,355) (1,392)
Amortization of prior service credit 0 0 0
Settlement charge 638 0 840
Recognized net actuarial loss (gain) 1,489 1,927 2,467
Net periodic benefit costs 3,996 3,878 4,374
Retiree Health and Life Benefits [Member]      
Components of net periodic benefit costs included in operating expenses [Abstract]      
Interest cost 143 166 81
Expected return on plan assets 0 0 0
Amortization of prior service credit (284) (498) (498)
Settlement charge 0 0 0
Recognized net actuarial loss (gain) (741) (775) (725)
Net periodic benefit costs $ (882) $ (1,107) $ (1,142)