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Business Combination - Purchase Price Allocation (Details) - USD ($)
$ in Thousands
9 Months Ended 10 Months Ended
Dec. 01, 2016
Sep. 30, 2017
Sep. 30, 2017
Dec. 31, 2016
Business Acquisition [Line Items]        
Goodwill   $ 385,574 $ 385,574 $ 382,963
Measurement Period Adjustments        
Goodwill   $ 2,611    
Noncompete agreements        
Measurement Period Adjustments        
Estimated Useful Life (Years)   1 year    
DTS, Inc        
Business Acquisition [Line Items]        
Cash and cash equivalents $ 53,377 $ 53,377 53,377  
Accounts receivable 27,114 27,114 27,114  
Unbilled contracts receivable, short-term 52,845 48,881 48,881  
Other current assets 5,269 5,269 5,269  
Prepaid income taxes 3,278 3,278 3,278  
Property and equipment 33,573 33,573 33,573  
Goodwill 372,827 375,438 375,438  
Total identifiable intangible assets 469,078 469,078 469,078  
Long-term deferred tax assets 637 637 637  
Unbilled contracts receivable, long-term 12,464 12,464 12,464  
Other assets 4,423 4,423 4,423  
Accounts payable (4,006) (4,006) (4,006)  
Accrued liabilities (19,727) (19,906) (19,906)  
Deferred revenue (561) (561) (561)  
Income taxes payable (727) (727) (727)  
Long-term deferred tax liabilities (39,822) (38,290) (38,290)  
Other long-term liabilities (15,337) (15,337) (15,337)  
Aggregate purchase price 954,705 $ 954,705 954,705  
Measurement Period Adjustments        
Unbilled contracts receivable, short-term     (3,964)  
Goodwill     2,611  
Accrued liabilities     (179)  
Long-term deferred tax liabilities     $ 1,532  
DTS, Inc | Customer contracts and related relationships        
Business Acquisition [Line Items]        
Identifiable intangible assets $ 281,569      
DTS, Inc | Customer contracts and related relationships | Minimum        
Measurement Period Adjustments        
Estimated Useful Life (Years) 3 years      
DTS, Inc | Customer contracts and related relationships | Maximum        
Measurement Period Adjustments        
Estimated Useful Life (Years) 7 years      
DTS, Inc | Developed technology        
Business Acquisition [Line Items]        
Identifiable intangible assets $ 143,639      
DTS, Inc | Developed technology | Minimum        
Measurement Period Adjustments        
Estimated Useful Life (Years) 5 years      
DTS, Inc | Developed technology | Maximum        
Measurement Period Adjustments        
Estimated Useful Life (Years) 6 years      
DTS, Inc | Trademarks and tradenames        
Business Acquisition [Line Items]        
Identifiable intangible assets $ 38,483      
Measurement Period Adjustments        
Estimated Useful Life (Years) 8 years      
DTS, Inc | Noncompete agreements        
Business Acquisition [Line Items]        
Identifiable intangible assets $ 2,231      
Measurement Period Adjustments        
Estimated Useful Life (Years) 1 year      
DTS, Inc | In-process research and development (IPR&D)        
Business Acquisition [Line Items]        
In-process research and development (IPR&D) $ 3,156