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Postretirement and Postemployment Benefits - Amounts Recognized in the Consolidated Balance Sheets (Details) - USD ($)
$ in Thousands
Sep. 25, 2022
Sep. 26, 2021
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Accumulated other comprehensive income (before income tax benefit) $ (5,452) $ (36,965)
Other Postretirement Benefits Plan    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Non-current assets 19,066 17,664
Postretirement benefit obligations (7,450) (9,859)
Accumulated other comprehensive income (before income tax benefit) $ 17,327 $ 17,747