Postretirement and Postemployment Benefits - Amounts Recognized in the Consolidated Balance Sheets (Details) - USD ($) $ in Thousands	Sep. 24, 2023	Sep. 25, 2022
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Accumulated other comprehensive income (before income tax benefit)	$ (16,653)	$ (5,005)
Other Postretirement Benefits Plan
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Non-current assets	21,565	19,066
Postretirement benefit obligations	(7,008)	(7,450)
Accumulated other comprehensive income (before income tax benefit)	$ 19,043	$ 17,327