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Postretirement and Postemployment Benefits - Net Period Postretirement Cost (Benefit) Components for Postretirement Plans (Details) - Postemployment Retirement Benefits - USD ($)
$ in Thousands
 12 Months Ended
Sep. 28, 2025
Sep. 29, 2024
Sep. 24, 2023
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Service cost for benefits earned during the year $ 2 $ 50 $ 68
Interest cost on projected benefit obligation 434 596 598
Expected return on plan assets (1,641) (1,279) (1,182)
Amortization of net (gain) loss (1,168) (1,234) (1,014)
Amortization of prior service benefit (285) (375) (647)
Curtailment gain 0 (1,184) 0
Net periodic pension cost (benefit) $ (2,658) $ (3,426) $ (2,177)