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Acquisitions - Summary of Pro Forma Adjustments Used to Arrive Pro Forma Net Income (Detail) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Conexant Systems, LLC [Member]        
Business Acquisition [Line Items]        
Buyer transaction costs     $ 0.9  
Interest expense   $ (4.7)   $ (9.0)
Intangible amortization   (7.7) (2.8) (12.6)
Depreciation $ (0.2) (0.2) (0.3) (0.5)
Income tax adjustment 0.1 4.4 0.8 7.7
Total (0.1) (8.2) (1.4) (14.4)
Marvell Technology Group Ltd [Member]        
Business Acquisition [Line Items]        
Buyer transaction costs     1.1  
Interest expense   (4.8)   (9.8)
Intangible amortization 0.5 (4.0) (1.7) (5.2)
Income tax adjustment (0.2) 3.1 0.2 5.3
Total $ 0.3 $ (5.7) $ (0.4) $ (9.7)