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Acquisitions - Summary of Unaudited Pro Forma Financial Information Presents Combined Results of Operations (Detail) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 6 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016
Conexant Systems, LLC [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Revenue | $ 430.4 | $ 488.4 | $ 855.9 | $ 902.9
Net income/(loss) | $ (82.5) | $ 11.1 | $ (109.4) | $ 5.4
Net income/(loss) per share | $ (2.42) | $ 0.32 | $ (3.24) | $ 0.16
Marvell Technology Group Ltd [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Revenue | $ 430.4 | $ 461.3 | $ 903.8 | $ 925.6
Net income/(loss) | $ (82.1) | $ 17.1 | $ (107.9) | $ 19.5
Net income/(loss) per share | $ (2.41) | $ 0.50 | $ (3.19) | $ 0.57

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