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Pension, Postretirement and Postemployment Defined Benefit Plans - Net Periodic Cost (Benefit) (Details) - USD ($)
$ in Thousands
 3 Months Ended
Dec. 29, 2024
Dec. 24, 2023
Pension Plan    
Defined Benefit Plan Disclosure [Line Items]    
Service cost for benefits earned during the period $ 1 $ 1
Interest cost on projected benefit obligation 2,034 2,515
Expected return on plan assets (2,319) (2,453)
Amortization of net (gain) loss 0 (2)
Amortization of prior service benefit 212 212
Settlement gain 0 (2,409)
Pension and postretirement medical benefit (72) (2,136)
Postretirement Medical Plans    
Defined Benefit Plan Disclosure [Line Items]    
Service cost for benefits earned during the period 1 13
Interest cost on projected benefit obligation 108 149
Expected return on plan assets (410) (320)
Amortization of net (gain) loss (292) (308)
Amortization of prior service benefit (71) (94)
Curtailment gain 0 (1,184)
Pension and postretirement medical benefit $ (664) $ (1,744)