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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)

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