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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 | 9 Months Ended
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Mar. 31, 2018 | Mar. 31, 2017 | Mar. 31, 2018 | Mar. 31, 2017
Conexant Systems, LLC [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Revenue | $ 394.0 | $ 469.1 | $ 1,249.9 | $ 1,372.0
Net income/(loss) | $ (13.8) | $ (0.4) | $ (122.4) | $ 19.8
Net income/(loss) per share | $ (0.40) | $ (0.01) | $ (3.60) | $ 0.57
Marvell Technology Group Ltd [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Revenue | $ 394.0 | $ 469.1 | $ 1,345.2 | $ 1,367.1
Net income/(loss) | $ (13.7) | $ 15.0 | $ (121.3) | $ 19.8
Net income/(loss) per share | $ (0.40) | $ 0.45 | $ (3.57) | $ 0.58

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