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Acquisitions - Additional Information (Detail) - USD ($)
$ in Millions
 12 Months Ended
Sep. 08, 2017
Jul. 25, 2017
Jun. 11, 2017
Jun. 29, 2019
Jun. 30, 2018
Business Acquisition [Line Items]          
Issuance of common stock for acquisition, value         $ 39.1
Acquired intangible assets amortize over an estimated weighted average useful life       4 years 4 months 24 days  
Customer Relationships [Member]          
Business Acquisition [Line Items]          
Acquired intangible assets amortize over an estimated weighted average useful life       4 years 1 month 6 days  
Backlog [Member]          
Business Acquisition [Line Items]          
Acquired intangible assets amortize over an estimated weighted average useful life       0 years  
Conexant Systems, LLC [Member]          
Business Acquisition [Line Items]          
Acquired intangible assets   $ 145.7      
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   1.9      
Business combination, consideration transferred   346.2      
Acquired intangible assets         $ 145.7
Conexant Systems, LLC [Member] | Securities Purchase Agreement [Member] | Maximum [Member]          
Business Acquisition [Line Items]          
Identified intangible assets included discount rates         14.00%
Conexant Systems, LLC [Member] | Securities Purchase Agreement [Member] | Minimum [Member]          
Business Acquisition [Line Items]          
Identified intangible assets included discount rates         9.00%
Conexant Systems, LLC [Member] | Securities Purchase Agreement [Member] | Developed Technology [Member]          
Business Acquisition [Line Items]          
Acquired intangible assets         $ 104.9
Acquired intangible assets amortize over an estimated weighted average useful life         6 years
Conexant Systems, LLC [Member] | Securities Purchase Agreement [Member] | Customer Relationships [Member]          
Business Acquisition [Line Items]          
Acquired intangible assets         $ 38.4
Acquired intangible assets amortize over an estimated weighted average useful life         5 years
Conexant Systems, LLC [Member] | Securities Purchase Agreement [Member] | Trademarks [Member]          
Business Acquisition [Line Items]          
Acquired intangible assets         $ 1.8
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         $ 0.4
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       3 years 1 year
Conexant Systems, LLC [Member] | Securities Purchase Agreement [Member] | In-Process Research and Development [Member]          
Business Acquisition [Line Items]          
Acquired intangible assets         $ 0.2
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 $ 48.7        
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 $ 48.7        
Marvell Technology Group Ltd [Member] | Asset Purchase Agreement [Member] | Maximum [Member]          
Business Acquisition [Line Items]          
Identified intangible assets included discount rates 32.00%        
Marvell Technology Group Ltd [Member] | Asset Purchase Agreement [Member] | Minimum [Member]          
Business Acquisition [Line Items]          
Identified intangible assets included discount rates 14.00%        
Marvell Technology Group Ltd [Member] | Asset Purchase Agreement [Member] | Developed Technology [Member]          
Business Acquisition [Line Items]          
Acquired intangible assets $ 29.0        
Acquired intangible assets amortize over an estimated weighted average useful life 3 years 7 months 6 days        
Marvell Technology Group Ltd [Member] | Asset Purchase Agreement [Member] | Customer Relationships [Member]          
Business Acquisition [Line Items]          
Acquired intangible assets $ 15.1        
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 $ 0.1        
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 $ 4.5