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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)

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