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Acquisitions - Summary of Pro Forma Adjustments Used to Arrive Pro Forma Net Income (Detail) - USD ($)
$ in Millions
 12 Months Ended
Jun. 30, 2018
Jun. 24, 2017
Conexant Systems, LLC [Member]    
Business Acquisition [Line Items]    
Buyer transaction costs $ 0.9  
Interest expense   $ (18.1)
Intangible amortization (1.8) (23.7)
Depreciation (0.5) (0.9)
Income tax adjustment 0.4 15.0
Total (1.0) (27.7)
Marvell Technology Group Ltd [Member]    
Business Acquisition [Line Items]    
Buyer transaction costs 1.1  
Interest expense   (19.6)
Intangible amortization (2.3) (17.6)
Income tax adjustment 0.3 13.0
Total $ (0.9) $ (24.2)