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Acquisitions - Summary of Pro Forma Adjustments Used to Arrive Pro Forma Net Income (Detail) - USD ($) $ in Millions | 12 Months Ended
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Jun. 30, 2018 | Jun. 24, 2017
Conexant Systems, LLC [Member] |  |
Business Acquisition [Line Items] |  |
Buyer transaction costs | $ 0.9 |
Interest expense |  | $ (18.1)
Intangible amortization | (1.8) | (23.7)
Depreciation | (0.5) | (0.9)
Income tax adjustment | 0.4 | 15.0
Total | (1.0) | (27.7)
Marvell Technology Group Ltd [Member] |  |
Business Acquisition [Line Items] |  |
Buyer transaction costs | 1.1 |
Interest expense |  | (19.6)
Intangible amortization | (2.3) | (17.6)
Income tax adjustment | 0.3 | 13.0
Total | $ (0.9) | $ (24.2)

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