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Composition Of Certain Financial Statement Captions (Narrative) (Details) - USD ($)
$ in Thousands
Sep. 26, 2025
Sep. 27, 2024
Aug. 19, 2024
Composition Of Certain Financial Statement Captions [Line Items]      
Unbilled accounts receivable $ 173,500 $ 173,800  
Raw materials 4,254 3,079  
GE Licensing      
Composition Of Certain Financial Statement Captions [Line Items]      
Assets acquired   24,500 $ 18,200
Disposal Group, Disposed of by Sale, Not Discontinued Operations | GE Licensing      
Composition Of Certain Financial Statement Captions [Line Items]      
Assets acquired 15,800    
Other Noncurrent Assets      
Composition Of Certain Financial Statement Captions [Line Items]      
Raw materials 7,500 $ 10,400  
Short-term and Long-term Investments | GE Licensing      
Composition Of Certain Financial Statement Captions [Line Items]      
Assets acquired $ 8,700