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Goodwill & Intangible Assets (Details) - USD ($)
$ in Thousands
 12 Months Ended
Aug. 19, 2024
Apr. 28, 2023
Jan. 31, 2022
Sep. 26, 2025
Sep. 27, 2024
Sep. 29, 2023
Goodwill [Roll Forward]            
Goodwill       $ 533,208 $ 408,409  
Goodwill, Acquired During Period         120,667  
Goodwill, Foreign Currency Translation and Measurement Period Adjustments       1,757 4,132  
Goodwill, Measurement Period Adjustment         (5,065)  
Goodwill       529,900 533,208 $ 408,409
Finite-Lived Intangible Assets, Net [Abstract]            
Cost       831,921 823,093  
Accumulated Amortization       (434,864) (388,579)  
Net       397,057 434,514  
Payments to acquire intangible assets       $ 5,600    
Weighted-average useful life       14 years    
Amortization of intangible assets       $ 45,300 33,200 $ 28,600
GE Licensing            
Goodwill [Roll Forward]            
Goodwill $ 75,387          
Finite-Lived Intangible Assets, Net [Abstract]            
Payments to acquire intangible assets         274,200  
Weighted-average useful life 11 years          
MPEG LA, L.L.C.            
Goodwill [Roll Forward]            
Goodwill   $ 40,579   (20,300)    
Finite-Lived Intangible Assets, Net [Abstract]            
Weighted-average useful life   12 years        
THEO Technologies            
Goodwill [Roll Forward]            
Goodwill     $ 39,900      
Finite-Lived Intangible Assets, Net [Abstract]            
Payments to acquire intangible assets         24,600  
Acquired patents and technology            
Finite-Lived Intangible Assets, Net [Abstract]            
Cost       587,743 579,768  
Accumulated Amortization       (324,507) (293,389)  
Net       263,236 286,379  
Customer relationships            
Finite-Lived Intangible Assets, Net [Abstract]            
Cost       221,007 220,200  
Accumulated Amortization       (87,401) (72,374)  
Net       133,606 147,826  
Other intangibles            
Finite-Lived Intangible Assets, Net [Abstract]            
Cost       23,171 23,125  
Accumulated Amortization       (22,956) (22,816)  
Net       $ 215 $ 309