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Acquisitions - Summary of Estimated Fair Values of Assets Acquired and Liabilities Assumed (Detail) - USD ($)
$ in Millions
Dec. 31, 2017
Sep. 08, 2017
Jul. 25, 2017
Jun. 30, 2017
Jun. 24, 2017
Business Acquisition [Line Items]          
Goodwill $ 368.3     $ 206.8 $ 206.8
Conexant Systems, LLC [Member]          
Business Acquisition [Line Items]          
Cash     $ 4.3    
Accounts receivable     11.7    
Inventory     51.0    
Other current assets     3.5    
Property and equipment     3.2    
Acquired intangible assets     152.5    
Other assets     0.9    
Total identifiable assets acquired     227.1    
Accounts payable     14.2    
Accrued compensation     1.1    
Other accrued liabilities     9.0    
Other long-term liabilities     3.0    
Net identifiable assets acquired     199.8    
Goodwill     146.4    
Net assets acquired     $ 346.2    
Marvell Technology Group Ltd [Member]          
Business Acquisition [Line Items]          
Inventory   $ 28.4      
Property and equipment   5.0      
Acquired intangible assets   45.6      
Total identifiable assets acquired   79.0      
Accrued liabilities   0.4      
Net identifiable assets acquired   78.6      
Goodwill   15.1      
Net assets acquired   $ 93.7