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Acquisitions - Summary of Estimated Fair Values of Assets Acquired and Liabilities Assumed (Detail) - USD ($)
$ in Millions
Sep. 30, 2017
Jun. 30, 2017
Jun. 24, 2017
Jun. 11, 2017
Business Acquisition [Line Items]        
Goodwill $ 364.1 $ 206.8 $ 206.8  
Conexant Systems, LLC [Member]        
Business Acquisition [Line Items]        
Cash       $ 4.3
Accounts receivable       11.6
Inventory       51.7
Other current assets       1.4
Property and equipment       3.2
Acquired intangible assets       152.5
Other assets       0.9
Total identifiable assets acquired       225.6
Accounts payable       14.2
Accrued compensation       1.1
Other accrued liabilities       3.8
Other long-term liabilities       3.0
Net identifiable assets acquired       203.5
Goodwill       142.2
Net assets acquired       345.7
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