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Acquisitions, Divestiture and Investment - Summary of Estimated Fair Values of Assets Acquired and Liabilities Assumed (Detail) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 26, 2020
Jul. 17, 2020
Jul. 02, 2020
Jun. 30, 2020
Jun. 27, 2020
Business Acquisition [Line Items]            
Goodwill $ 568.6 $ 568.6     $ 360.8 $ 360.8
Display Link Corporation [Member]            
Business Acquisition [Line Items]            
Cash and cash equivalents     $ 40.9      
Short-term investments     94.0      
Accounts receivable, net     7.1      
Inventory     33.1      
Prepaid expenses and other current assets     9.1      
Property and equipment     6.8      
Intangible assets     193.0      
Right-of-use lease asset     20.0      
Non-current other assets     0.6      
Total identifiable assets acquired     404.6      
Accounts payable     (5.2)      
Other accrued liabilities     (9.9)      
Short-term lease liabilities     (1.7)      
Long-term lease liabilities     (18.2)      
Other long-term liabilities     (31.8)      
Total liabilities     (66.8)      
Net identifiable assets acquired     337.8      
Goodwill     105.0      
Net assets acquired     $ 442.8      
Broadcom [Member]            
Business Acquisition [Line Items]            
Property and equipment       $ 1.0    
Intangible assets       123.0    
Total identifiable assets acquired       124.0    
Liabilities assumed       (0.2)    
Goodwill       102.8    
Net assets acquired       $ 226.6