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Defined Benefit Pension Plans - Benefit Obligations and Plan Assets (Details) - Pension Plan - USD ($)
$ in Thousands
 1 Months Ended 12 Months Ended
Sep. 25, 2022
Sep. 24, 2023
Sep. 25, 2022
Sep. 26, 2021
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]        
Benefit obligation, beginning of year   $ 210,806 $ 386,832  
Service cost   19 488 $ 2,529
Interest cost   10,368 7,999 7,147
Plan amendments   0 6,077  
Actuarial (gain) loss   (9,876) (86,387)  
Benefits paid   (12,130) (21,799)  
Liability (gain)/loss due to curtailment   0 (1,027)  
Settlements $ (81,400) 0 (81,377)  
Benefit obligation, end of year 210,806 199,187 210,806 386,832
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]        
Fair value of plan assets, beginning of year:   211,058 400,907  
Actual return on plan assets   12,638 (84,636)  
Benefits paid   (12,130) (21,799)  
Administrative expenses paid   (1,535) (2,149)  
Settlements   0 (81,377)  
Employer contributions   0 112  
Fair value of plan assets, end of year 211,058 210,031 211,058 $ 400,907
Funded status $ 252 $ 10,844 $ 252