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Pension, Postretirement and Postemployment Defined Benefit Plans - Net Periodic Cost (Benefit) (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Jun. 23, 2024
Jun. 25, 2023
Jun. 23, 2024
Jun. 25, 2023
Pension Plan        
Defined Benefit Plan Disclosure [Line Items]        
Service cost for benefits earned during the period $ 1 $ 5 $ 3 $ 15
Interest cost on projected benefit obligation 2,253 2,592 7,021 7,776
Expected return on plan assets (2,310) (2,548) (7,073) (7,644)
Amortization of net (gain) loss (1) 2 (4) 6
Amortization of prior service benefit 212 213 636 639
Settlement gain 0 0 (2,409) 0
Pension and postretirement medical benefit 155 264 (1,826) 792
Postretirement Medical Plans        
Defined Benefit Plan Disclosure [Line Items]        
Service cost for benefits earned during the period 13 17 38 51
Interest cost on projected benefit obligation 149 149 447 447
Expected return on plan assets (320) (295) (959) (885)
Amortization of net (gain) loss (308) (254) (925) (762)
Amortization of prior service benefit (94) (162) (282) (486)
Pension and postretirement medical benefit $ (560) $ (545) $ (2,865) $ (1,635)