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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. 26, 2023
Mar. 27, 2022
Mar. 26, 2023
Mar. 27, 2022
Pension Plan        
Defined Benefit Plan Disclosure [Line Items]        
Service cost for benefits earned during the period $ 5 $ 287 $ 10 $ 743
Interest cost on projected benefit obligation 2,592 2,001 5,184 3,938
Expected return on plan assets (2,548) (4,535) (5,096) (9,071)
Amortization of net gain (loss) 2 (687) 4 (1,946)
Amortization of prior service benefit 213 212 426 212
Curtailment gain 0 0 0 (1,027)
Pension and postretirement medical cost (benefit) 264 (2,722) 528 (7,151)
Postretirement Medical Plans        
Defined Benefit Plan Disclosure [Line Items]        
Service cost for benefits earned during the period 17 27 34 54
Interest cost on projected benefit obligation 149 85 298 170
Expected return on plan assets (295) (263) (590) (526)
Amortization of net gain (loss) (254) (249) (508) (498)
Amortization of prior service benefit (162) (162) (324) (324)
Pension and postretirement medical cost (benefit) $ (545) $ (562) $ (1,090) $ (1,124)