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Pension Plans and Other Postretirement Benefits - Components of Net Periodic Benefit Costs (Details) - USD ($)
$ in Thousands
 3 Months Ended
Dec. 28, 2024
Dec. 30, 2023
Pension Benefits [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Interest cost $ 646 $ 805
Expected return on plan assets (329) (315)
Amortization of net loss (gain) 62 425
Net periodic benefit cost 379 915
Postretirement Benefits [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Interest cost 25 36
Amortization of prior service credits (6) (65)
Amortization of net loss (gain) (172) (191)
Net periodic benefit cost $ (153) $ (220)