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Pensions And Other Postretirement Benefits (Multiemployer Plans) (Details)
$ in Millions
 12 Months Ended
Sep. 27, 2025
USD ($)
plan
Sep. 28, 2024
USD ($)
Sep. 30, 2023
USD ($)
Multiemployer Plan [Line Items]      
Multiemployer Plan, Number of Plans 1    
Pension Plan [Member]      
Multiemployer Plan [Line Items]      
Multiemployer Plan, Employer Contribution, Cost | $ $ 1 $ 2  
Defined Benefit Plan, Number of Plans | plan 4    
Pension Plan [Member] | Nonqualified Plan      
Multiemployer Plan [Line Items]      
Defined Benefit Plan, Number of Plans | plan 3    
Bakery and Confectionary Union | Pension Plan [Member]      
Multiemployer Plan [Line Items]      
Multiemployer Plan, Employer Contribution, Cost | $ $ 1 $ 2 $ 2
Multiemployer Plan, Pension, Insignificant, Collective-Bargaining Arrangement, Expiration Date Aug. 01, 2027    
Multiemployer Plans, Surcharge Imposed 10.00%