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Pension, Postretirement and Postemployment Defined Benefit Plans - Narrative (Details)
 3 Months Ended
Dec. 24, 2023
USD ($)
plan
participant
Dec. 25, 2022
USD ($)
Sep. 24, 2023
USD ($)
Defined Benefit Plan Disclosure [Line Items]      
Number of defined benefit plans | plan 1    
Multiemployer plans, withdrawal obligation $ 24,800,000   $ 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    
Defined benefit plan, benefit obligation, lump sum payment for settlement $ 22,600,000    
Settlement gain 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    
Medical Plan      
Defined Benefit Plan Disclosure [Line Items]      
Curtailment gain $ 1,184,000 $ 0