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Postretirement and Postemployment Benefits - Benefit Obligations and Plan Assets (Details) - Other Postretirement Benefits Plan - USD ($)
$ in Thousands
 12 Months Ended
Sep. 28, 2025
Sep. 29, 2024
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]    
Benefit obligation, beginning of year $ 10,217 $ 11,252
Service cost 2 50
Interest cost 434 596
Actuarial loss (gain) (2,290) 1,215
Benefits paid, net of premiums received (732) (1,712)
Liability (gain)/loss due to curtailment 0 (1,184)
Benefit obligation, end of year 7,631 10,217
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]    
Fair value of plan assets, beginning of year 27,570 25,809
Actual return on plan assets (1,157) 2,615
Employer contributions 603 858
Benefits paid, net of premiums and Medicare Part D subsidies received (732) (1,712)
Plan participant contributions 0 0
Fair value of plan assets, end of year 26,284 27,570
Funded status $ 18,653 $ 17,353