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Acquisitions - Additional Information (Detail) - USD ($) $ in Millions |  |  |  | 10 Months Ended | 11 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | ---
Sep. 08, 2017 | Jul. 25, 2017 | Jun. 11, 2017 | Jun. 30, 2018 | Jun. 30, 2018 | Jun. 30, 2018 | Jun. 24, 2017 | Jun. 25, 2016
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Issuance of common stock for acquisition, value |  |  |  |  |  | $ 39.1 |  |
Acquired intangible assets amortize over an estimated weighted average useful life |  |  |  |  |  | 5 years |  |
Net revenue |  |  |  |  |  | $ 1,630.3 | $ 1,718.2 | $ 1,666.9
Operating income/(loss) |  |  |  |  |  | $ (61.9) | $ 64.7 | $ 75.2
Customer Relationships [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Acquired intangible assets amortize over an estimated weighted average useful life |  |  |  |  |  | 4 years 1 month 6 days |  |
Backlog [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Acquired intangible assets amortize over an estimated weighted average useful life |  |  |  |  |  | 6 months |  |
Conexant Systems, LLC [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Acquired intangible assets |  | $ 145.7 |  |  |  |  |  |
Conexant Systems, LLC [Member] | Securities Purchase Agreement [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Acquisition agreement date |  |  | Jun. 11, 2017 |  |  |  |  |
Acquisition closing effective date |  | Jul. 25, 2017 |  |  |  |  |  |
Purchase price of acquisition |  | $ 305.4 |  |  |  |  |  |
Issuance of common stock for acquisition, shares |  | 726,666 |  |  |  |  |  |
Issuance of common stock for acquisition, value |  | $ 39.1 |  |  |  |  |  |
Business acquisition stock appreciation rights liability |  | 3.5 |  |  |  |  |  |
Purchase price held in escrow |  | 16.8 |  |  |  |  |  |
Business combination purchase price adjustment |  | 1.9 |  |  |  |  |  |
Business combination, consideration transferred |  | 346.2 |  |  |  |  |  |
Acquired intangible assets |  |  |  | $ 145.7 | $ 145.7 | $ 145.7 |  |
Net revenue |  |  |  |  | 116.5 |  |  |
Operating income/(loss) |  |  |  |  | (37.0) |  |  |
Conexant Systems, LLC [Member] | Securities Purchase Agreement [Member] | Maximum [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Identified intangible assets included discount rates |  |  |  |  |  | 14.00% |  |
Conexant Systems, LLC [Member] | Securities Purchase Agreement [Member] | Minimum [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Identified intangible assets included discount rates |  |  |  |  |  | 9.00% |  |
Conexant Systems, LLC [Member] | Securities Purchase Agreement [Member] | Developed Technology [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Acquired intangible assets |  |  |  | 104.9 | 104.9 | $ 104.9 |  |
Acquired intangible assets amortize over an estimated weighted average useful life |  |  |  |  |  | 6 years |  |
Conexant Systems, LLC [Member] | Securities Purchase Agreement [Member] | Customer Relationships [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Acquired intangible assets |  |  |  | 38.4 | 38.4 | $ 38.4 |  |
Acquired intangible assets amortize over an estimated weighted average useful life |  |  |  |  |  | 5 years |  |
Conexant Systems, LLC [Member] | Securities Purchase Agreement [Member] | Trademarks [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Acquired intangible assets |  |  |  | 1.8 | 1.8 | $ 1.8 |  |
Acquired intangible assets amortize over an estimated weighted average useful life |  |  |  |  |  | 7 years |  |
Conexant Systems, LLC [Member] | Securities Purchase Agreement [Member] | Backlog [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Acquired intangible assets |  |  |  | 0.4 | 0.4 | $ 0.4 |  |
Conexant Systems, LLC [Member] | Securities Purchase Agreement [Member] | Backlog [Member] | Maximum [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Acquired intangible assets amortize over an estimated weighted average useful life |  |  |  |  |  | 1 year |  |
Conexant Systems, LLC [Member] | Securities Purchase Agreement [Member] | In-Process Research and Development [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Acquired intangible assets |  |  |  | 0.2 | $ 0.2 | $ 0.2 |  |
Conexant Systems, LLC [Member] | Securities Purchase Agreement [Member] | Escrow Obligations Under Purchase Agreement [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Purchase price held in escrow |  | $ 7.0 |  |  |  |  |  |
Marvell Technology Group Ltd [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Acquired intangible assets | $ 48.7 |  |  |  |  |  |  |
Marvell Technology Group Ltd [Member] | Asset Purchase Agreement [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Acquisition agreement date |  |  | Jun. 11, 2017 |  |  |  |  |
Acquisition closing effective date | Sep. 08, 2017 |  |  |  |  |  |  |
Purchase price of acquisition | $ 93.7 |  |  |  |  |  |  |
Acquired intangible assets | $ 48.7 |  |  |  |  |  |  |
Net revenue |  |  |  | 138.0 |  |  |  |
Operating income/(loss) |  |  |  | $ (14.1) |  |  |  |
Marvell Technology Group Ltd [Member] | Asset Purchase Agreement [Member] | Maximum [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Identified intangible assets included discount rates | 32.00% |  |  |  |  |  |  |
Marvell Technology Group Ltd [Member] | Asset Purchase Agreement [Member] | Minimum [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Identified intangible assets included discount rates | 14.00% |  |  |  |  |  |  |
Marvell Technology Group Ltd [Member] | Asset Purchase Agreement [Member] | Developed Technology [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Acquired intangible assets | $ 29.0 |  |  |  |  |  |  |
Acquired intangible assets amortize over an estimated weighted average useful life | 3 years 7 months 6 days |  |  |  |  |  |  |
Marvell Technology Group Ltd [Member] | Asset Purchase Agreement [Member] | Customer Relationships [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Acquired intangible assets | $ 15.1 |  |  |  |  |  |  |
Acquired intangible assets amortize over an estimated weighted average useful life | 4 years |  |  |  |  |  |  |
Marvell Technology Group Ltd [Member] | Asset Purchase Agreement [Member] | Backlog [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Acquired intangible assets | $ 0.1 |  |  |  |  |  |  |
Marvell Technology Group Ltd [Member] | Asset Purchase Agreement [Member] | Backlog [Member] | Maximum [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Acquired intangible assets amortize over an estimated weighted average useful life | 1 year |  |  |  |  |  |  |
Marvell Technology Group Ltd [Member] | Asset Purchase Agreement [Member] | In-Process Research and Development [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Acquired intangible assets | $ 4.5 |  |  |  |  |  |  |

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