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Postretirement and Postemployment Benefits - Fair Value Hierarchy of Benefit Plan Assets (Details) - Other Postretirement Benefits Plan - USD ($)
$ in Thousands
Sep. 28, 2025
Sep. 29, 2024
Sep. 24, 2023
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Postretirement assets $ 26,284 $ 27,570 $ 25,809
NAV | Cash and cash equivalents      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Postretirement assets 0 0  
NAV | Equity securities- short term bond fund      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Postretirement assets 0 0  
NAV | Hedge fund investments      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Postretirement assets 213 236  
NAV | Fixed income securities      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Postretirement assets   0  
Level 1 | Cash and cash equivalents      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Postretirement assets 43 436  
Level 1 | Equity securities- short term bond fund      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Postretirement assets 26,482 6,983  
Level 1 | Hedge fund investments      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Postretirement assets 0 0  
Level 1 | Fixed income securities      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Postretirement assets   20,392  
Level 2 | Cash and cash equivalents      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Postretirement assets 0 0  
Level 2 | Equity securities- short term bond fund      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Postretirement assets 0 0  
Level 2 | Hedge fund investments      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Postretirement assets 0 0  
Level 2 | Fixed income securities      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Postretirement assets   0  
Level 3 | Cash and cash equivalents      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Postretirement assets 0 0  
Level 3 | Equity securities- short term bond fund      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Postretirement assets 0 0  
Level 3 | Hedge fund investments      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Postretirement assets $ 0 0  
Level 3 | Fixed income securities      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Postretirement assets   $ 0