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Acquisitions - Additional Information (Detail) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended 7 Months Ended 8 Months Ended 9 Months Ended
Sep. 08, 2017
Jul. 25, 2017
Jun. 11, 2017
Mar. 31, 2018
Mar. 31, 2017
Dec. 30, 2017
Mar. 31, 2018
Mar. 31, 2018
Mar. 31, 2018
Mar. 31, 2017
Sep. 30, 2017
Business Acquisition [Line Items]                      
Acquired intangible assets amortize over an estimated weighted average useful life                 4 years 7 months 6 days    
Operating income/(loss)       $ (12.3) $ 12.3       $ (53.2) $ 46.7  
Decrease in amortization of intangible assets       (18.7) (14.0)       (62.0) (45.2)  
Net revenue       394.0 444.2       1,241.8 1,291.7  
Cost of Revenue [Member]                      
Business Acquisition [Line Items]                      
Decrease in amortization of intangible assets       (17.2) $ (11.7)       $ (53.4) $ (35.9)  
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                 6 months    
Conexant Systems, LLC [Member]                      
Business Acquisition [Line Items]                      
Acquired intangible assets   $ 116.9                  
Conexant Systems, LLC [Member] | Securities Purchase Agreement [Member]                      
Business Acquisition [Line Items]                      
Acquisition agreement date     Jun. 11, 2017                
Acquisition closing effective date   Jul. 25, 2017                  
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   1.8                  
Business combination, consideration transferred   346.2                  
Acquired intangible assets       116.9   $ 152.5 $ 116.9 $ 116.9 $ 116.9   $ 152.5
Operating income/(loss)           $ 2.2   (34.7)      
Net revenue               87.8      
Conexant Systems, LLC [Member] | Securities Purchase Agreement [Member] | Cost of Revenue [Member]                      
Business Acquisition [Line Items]                      
Decrease in amortization of intangible assets       0.9              
Conexant Systems, LLC [Member] | Securities Purchase Agreement [Member] | Operating Expense [Member]                      
Business Acquisition [Line Items]                      
Decrease in amortization of intangible assets       1.3              
Conexant Systems, LLC [Member] | Securities Purchase Agreement [Member] | Goodwill [Member]                      
Business Acquisition [Line Items]                      
Reduction to the intangible assets                 $ 35.6    
Conexant Systems, LLC [Member] | Securities Purchase Agreement [Member] | Maximum [Member]                      
Business Acquisition [Line Items]                      
Identified intangible assets included discount rates                 12.00%    
Conexant Systems, LLC [Member] | Securities Purchase Agreement [Member] | Minimum [Member]                      
Business Acquisition [Line Items]                      
Identified intangible assets included discount rates                 8.00%    
Conexant Systems, LLC [Member] | Securities Purchase Agreement [Member] | Developed Technology [Member]                      
Business Acquisition [Line Items]                      
Acquired intangible assets       93.2     93.2 93.2 $ 93.2    
Acquired intangible assets amortize over an estimated weighted average useful life                 5 years    
Conexant Systems, LLC [Member] | Securities Purchase Agreement [Member] | Customer Relationships [Member]                      
Business Acquisition [Line Items]                      
Acquired intangible assets       21.7     21.7 21.7 $ 21.7    
Acquired intangible assets amortize over an estimated weighted average useful life                 4 years    
Conexant Systems, LLC [Member] | Securities Purchase Agreement [Member] | Trademarks [Member]                      
Business Acquisition [Line Items]                      
Acquired intangible assets       1.7     1.7 1.7 $ 1.7    
Acquired intangible assets amortize over an estimated weighted average useful life                 7 years    
Conexant Systems, LLC [Member] | Securities Purchase Agreement [Member] | Backlog [Member]                      
Business Acquisition [Line Items]                      
Acquired intangible assets       $ 0.3     0.3 $ 0.3 $ 0.3    
Conexant Systems, LLC [Member] | Securities 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] | Securities 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 $ 45.7                    
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 $ 45.7                    
Operating income/(loss)             (12.7)        
Net revenue             $ 98.1        
Marvell Technology Group Ltd [Member] | Asset Purchase Agreement [Member] | Maximum [Member]                      
Business Acquisition [Line Items]                      
Identified intangible assets included discount rates 19.00%                    
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 $ 24.9                    
Acquired intangible assets amortize over an estimated weighted average useful life 4 years                    
Marvell Technology Group Ltd [Member] | Asset Purchase Agreement [Member] | Customer Relationships [Member]                      
Business Acquisition [Line Items]                      
Acquired intangible assets $ 16.2                    
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 $ 1.0                    
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 $ 3.6