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Pension, Postretirement and Postemployment Defined Benefit Plans - Narrative (Details)
 3 Months Ended 9 Months Ended
Jun. 23, 2024
USD ($)
plan
participant
Jun. 25, 2023
USD ($)
Jun. 23, 2024
USD ($)
plan
participant
Jun. 25, 2023
USD ($)
Sep. 24, 2023
USD ($)
Defined Benefit Plan Disclosure [Line Items]          
Number of defined benefit plans | plan 1   1    
Multiemployer plans, withdrawal obligation $ 24,000,000.0   $ 24,000,000.0   $ 25,100,000
Multiemployer plans, withdrawal obligation, period (years)     20 years    
Pension Plan          
Defined Benefit Plan Disclosure [Line Items]          
Defined benefit plan, benefit obligation, voluntary settlement, number of participants | participant 522   522    
Defined benefit plan, benefit obligation, lump sum payment for settlement $ 22,600,000   $ 22,600,000    
Settlement gain 0 $ 0 2,409,000 $ 0  
Defined benefit plan, plan assets, period increase (decrease)     (22,600,000)    
Defined benefit plan, plan assets, contributions by employer     0 0  
Defined benefit plan, expected future employer contributions, next fiscal year 0   0    
Medical Plan          
Defined Benefit Plan Disclosure [Line Items]          
Curtailment gain $ 0 $ 0 $ 1,184,000 $ 0