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Pension, Postretirement and Postemployment Defined Benefit Plans - Net Periodic Cost (Benefit) (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Mar. 24, 2024
Mar. 26, 2023
Mar. 24, 2024
Mar. 26, 2023
Pension Plan        
Defined Benefit Plan Disclosure [Line Items]        
Service cost for benefits earned during the period $ 1 $ 5 $ 2 $ 10
Interest cost on projected benefit obligation 2,253 2,592 4,768 5,184
Expected return on plan assets (2,310) (2,548) (4,763) (5,096)
Amortization of net (gain) loss (1) 2 (3) 4
Amortization of prior service benefit 212 213 424 426
Settlement gain 0 0 (2,409) 0
Pension and postretirement medical benefit 155 264 (1,981) 528
Postretirement Medical Plans        
Defined Benefit Plan Disclosure [Line Items]        
Service cost for benefits earned during the period 13 17 25 34
Interest cost on projected benefit obligation 149 149 298 298
Expected return on plan assets (320) (295) (639) (590)
Amortization of net (gain) loss (308) (254) (617) (508)
Amortization of prior service benefit (94) (162) (188) (324)
Pension and postretirement medical benefit $ (560) $ (545) $ (2,305) $ (1,090)