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Acquisitions - Summary of Pro Forma Adjustments Used to Arrive Pro Forma Net Income (Detail) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Mar. 31, 2018
Mar. 31, 2017
Conexant Systems, LLC [Member]        
Business Acquisition [Line Items]        
Buyer transaction costs     $ 0.9  
Interest expense   $ (4.5)   $ (13.6)
Intangible amortization   (6.1) (1.7) (16.5)
Depreciation $ (0.2) (0.2) (0.3) (0.7)
Income tax adjustment 0.1 3.8 0.3 10.8
Total $ (0.1) (7.0) (0.8) (20.0)
Marvell Technology Group Ltd [Member]        
Business Acquisition [Line Items]        
Buyer transaction costs     1.1  
Interest expense   (4.9)   (14.7)
Intangible amortization   (5.6) (1.2) (7.3)
Income tax adjustment   3.7   7.7
Total   $ (6.8) $ (0.1) $ (14.3)