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Restructuring (Summary of Changes in Restructuring Accruals) (Details) - USD ($)
$ in Thousands
12 Months Ended
Sep. 26, 2025
Sep. 27, 2024
Sep. 29, 2023
Restructuring Reserve [Roll Forward]      
Restructuring reserve, beginning balance $ 2,765 $ 20,352  
Restructuring charges (15,007) (6,384) $ (47,061)
Cash payments (13,107) (23,971)  
Restructuring reserve, ending balance 4,665 2,765 20,352
Employee Severance [Member]      
Restructuring Reserve [Roll Forward]      
Restructuring reserve, beginning balance 2,765 20,352  
Restructuring charges (11,624) (6,413)  
Cash payments (9,724) (24,000)  
Restructuring reserve, ending balance 4,665 2,765 20,352
Facility Closing [Member]      
Restructuring Reserve [Roll Forward]      
Restructuring reserve, beginning balance 0 0  
Restructuring charges 3,383 (29)  
Cash payments (3,383) (29)  
Restructuring reserve, ending balance $ 0 $ 0 $ 0