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Acquisitions - Additional Information (Detail) - USD ($)
$ in Millions
 1 Months Ended 2 Months Ended 3 Months Ended
Sep. 08, 2017
Jul. 25, 2017
Jun. 11, 2017
Sep. 30, 2017
Sep. 30, 2017
Sep. 30, 2017
Sep. 30, 2016
Business Acquisition [Line Items]              
Acquired intangible assets amortize over an estimated weighted average useful life           4 years 4 months 24 days  
Net revenue           $ 417.4 $ 386.2
Operating loss           $ 16.9 $ (5.6)
Customer Relationships [Member]              
Business Acquisition [Line Items]              
Acquired intangible assets amortize over an estimated weighted average useful life           3 years 7 months 6 days  
Backlog [Member]              
Business Acquisition [Line Items]              
Acquired intangible assets amortize over an estimated weighted average useful life           3 months 19 days  
Conexant Systems, LLC [Member]              
Business Acquisition [Line Items]              
Acquired intangible assets     $ 152.5        
Conexant Systems, LLC [Member] | Stock Purchase Agreement [Member]              
Business Acquisition [Line Items]              
Acquisition agreement date     Jun. 11, 2017        
Acquisition closing effective date   Jul. 25, 2017          
Acquired outstanding common and preferred shares and voting interest   100.00%          
Purchase price of acquisition   $ 305.4          
Issuance of common stock for acquisition, shares   726,666          
Issuance of common stock for acquisition, value   $ 39.1          
Business acquisition stock appreciation rights liability   3.5          
Purchase price held in escrow   16.8          
Business combination purchase price adjustment   2.3          
Business combination, consideration transferred   345.7          
Acquired intangible assets     $ 152.5        
Net revenue         $ 23.2    
Operating loss         $ 14.9    
Conexant Systems, LLC [Member] | Stock Purchase Agreement [Member] | Maximum [Member]              
Business Acquisition [Line Items]              
Identified intangible assets included discount rates     14.00%        
Conexant Systems, LLC [Member] | Stock Purchase Agreement [Member] | Minimum [Member]              
Business Acquisition [Line Items]              
Identified intangible assets included discount rates     9.00%        
Conexant Systems, LLC [Member] | Stock Purchase Agreement [Member] | Developed Technology [Member]              
Business Acquisition [Line Items]              
Acquired intangible assets     $ 100.0        
Acquired intangible assets amortize over an estimated weighted average useful life     5 years        
Conexant Systems, LLC [Member] | Stock Purchase Agreement [Member] | Customer Relationships [Member]              
Business Acquisition [Line Items]              
Acquired intangible assets     $ 32.1        
Acquired intangible assets amortize over an estimated weighted average useful life     4 years        
Conexant Systems, LLC [Member] | Stock Purchase Agreement [Member] | Trademarks [Member]              
Business Acquisition [Line Items]              
Acquired intangible assets     $ 4.8        
Acquired intangible assets amortize over an estimated weighted average useful life     7 years        
Conexant Systems, LLC [Member] | Stock Purchase Agreement [Member] | Backlog [Member]              
Business Acquisition [Line Items]              
Acquired intangible assets     $ 0.3        
Conexant Systems, LLC [Member] | Stock Purchase Agreement [Member] | Backlog [Member] | Maximum [Member]              
Business Acquisition [Line Items]              
Acquired intangible assets amortize over an estimated weighted average useful life     1 year        
Conexant Systems, LLC [Member] | Stock Purchase Agreement [Member] | In-Process Research and Development [Member]              
Business Acquisition [Line Items]              
Acquired intangible assets     $ 15.3        
Conexant Systems, LLC [Member] | Stock Purchase Agreement [Member] | Escrow Obligations Under Purchase Agreement [Member]              
Business Acquisition [Line Items]              
Purchase price held in escrow   $ 7.0          
Marvell Technology Group Ltd [Member]              
Business Acquisition [Line Items]              
Acquired intangible assets     $ 45.6        
Marvell Technology Group Ltd [Member] | Asset Purchase Agreement [Member]              
Business Acquisition [Line Items]              
Acquisition agreement date     Jun. 11, 2017        
Acquisition closing effective date Sep. 08, 2017            
Purchase price of acquisition $ 93.7            
Acquired intangible assets     $ 45.6        
Net revenue       $ 15.7      
Operating loss       $ 4.1      
Marvell Technology Group Ltd [Member] | Asset Purchase Agreement [Member] | Maximum [Member]              
Business Acquisition [Line Items]              
Identified intangible assets included discount rates     18.00%        
Marvell Technology Group Ltd [Member] | Asset Purchase Agreement [Member] | Minimum [Member]              
Business Acquisition [Line Items]              
Identified intangible assets included discount rates     9.00%        
Marvell Technology Group Ltd [Member] | Asset Purchase Agreement [Member] | Developed Technology [Member]              
Business Acquisition [Line Items]              
Acquired intangible assets     $ 17.4        
Acquired intangible assets amortize over an estimated weighted average useful life     3 years        
Marvell Technology Group Ltd [Member] | Asset Purchase Agreement [Member] | Customer Relationships [Member]              
Business Acquisition [Line Items]              
Acquired intangible assets     $ 12.7        
Acquired intangible assets amortize over an estimated weighted average useful life     4 years        
Marvell Technology Group Ltd [Member] | Asset Purchase Agreement [Member] | Backlog [Member]              
Business Acquisition [Line Items]              
Acquired intangible assets     $ 1.2        
Marvell Technology Group Ltd [Member] | Asset Purchase Agreement [Member] | Backlog [Member] | Maximum [Member]              
Business Acquisition [Line Items]              
Acquired intangible assets amortize over an estimated weighted average useful life     1 year        
Marvell Technology Group Ltd [Member] | Asset Purchase Agreement [Member] | In-Process Research and Development [Member]              
Business Acquisition [Line Items]              
Acquired intangible assets     $ 14.3