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Acquisitions - Additional Information (Detail) - USD ($) $ in Millions |  |  |  | 3 Months Ended | 6 Months Ended | 7 Months Ended | 8 Months Ended | 9 Months Ended |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Sep. 08, 2017 | Jul. 25, 2017 | Jun. 11, 2017 | Mar. 31, 2018 | Mar. 31, 2017 | Dec. 30, 2017 | Mar. 31, 2018 | Mar. 31, 2018 | Mar. 31, 2018 | Mar. 31, 2017 | Sep. 30, 2017
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Acquired intangible assets amortize over an estimated weighted average useful life |  |  |  |  |  |  |  |  | 4 years 7 months 6 days |  |
Operating income/(loss) |  |  |  | $ (12.3) | $ 12.3 |  |  |  | $ (53.2) | $ 46.7 |
Decrease in amortization of intangible assets |  |  |  | (18.7) | (14.0) |  |  |  | (62.0) | (45.2) |
Net revenue |  |  |  | 394.0 | 444.2 |  |  |  | 1,241.8 | 1,291.7 |
Cost of Revenue [Member] |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Decrease in amortization of intangible assets |  |  |  | (17.2) | $ (11.7) |  |  |  | $ (53.4) | $ (35.9) |
Customer Relationships [Member] |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Acquired intangible assets amortize over an estimated weighted average useful life |  |  |  |  |  |  |  |  | 3 years 7 months 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 |  | $ 116.9 |  |  |  |  |  |  |  |  |
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 |  | 1.8 |  |  |  |  |  |  |  |  |
Business combination, consideration transferred |  | 346.2 |  |  |  |  |  |  |  |  |
Acquired intangible assets |  |  |  | 116.9 |  | $ 152.5 | $ 116.9 | $ 116.9 | $ 116.9 |  | $ 152.5
Operating income/(loss) |  |  |  |  |  | $ 2.2 |  | (34.7) |  |  |
Net revenue |  |  |  |  |  |  |  | 87.8 |  |  |
Conexant Systems, LLC [Member] | Securities Purchase Agreement [Member] | Cost of Revenue [Member] |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Decrease in amortization of intangible assets |  |  |  | 0.9 |  |  |  |  |  |  |
Conexant Systems, LLC [Member] | Securities Purchase Agreement [Member] | Operating Expense [Member] |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Decrease in amortization of intangible assets |  |  |  | 1.3 |  |  |  |  |  |  |
Conexant Systems, LLC [Member] | Securities Purchase Agreement [Member] | Goodwill [Member] |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Reduction to the intangible assets |  |  |  |  |  |  |  |  | $ 35.6 |  |
Conexant Systems, LLC [Member] | Securities Purchase Agreement [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Identified intangible assets included discount rates |  |  |  |  |  |  |  |  | 12.00% |  |
Conexant Systems, LLC [Member] | Securities Purchase Agreement [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Identified intangible assets included discount rates |  |  |  |  |  |  |  |  | 8.00% |  |
Conexant Systems, LLC [Member] | Securities Purchase Agreement [Member] | Developed Technology [Member] |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Acquired intangible assets |  |  |  | 93.2 |  |  | 93.2 | 93.2 | $ 93.2 |  |
Acquired intangible assets amortize over an estimated weighted average useful life |  |  |  |  |  |  |  |  | 5 years |  |
Conexant Systems, LLC [Member] | Securities Purchase Agreement [Member] | Customer Relationships [Member] |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Acquired intangible assets |  |  |  | 21.7 |  |  | 21.7 | 21.7 | $ 21.7 |  |
Acquired intangible assets amortize over an estimated weighted average useful life |  |  |  |  |  |  |  |  | 4 years |  |
Conexant Systems, LLC [Member] | Securities Purchase Agreement [Member] | Trademarks [Member] |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Acquired intangible assets |  |  |  | 1.7 |  |  | 1.7 | 1.7 | $ 1.7 |  |
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 |  |  |  | $ 0.3 |  |  | 0.3 | $ 0.3 | $ 0.3 |  |
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] | 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 | $ 45.7 |  |  |  |  |  |  |  |  |  |
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 | $ 45.7 |  |  |  |  |  |  |  |  |  |
Operating income/(loss) |  |  |  |  |  |  | (12.7) |  |  |  |
Net revenue |  |  |  |  |  |  | $ 98.1 |  |  |  |
Marvell Technology Group Ltd [Member] | Asset Purchase Agreement [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Identified intangible assets included discount rates | 19.00% |  |  |  |  |  |  |  |  |  |
Marvell Technology Group Ltd [Member] | Asset Purchase Agreement [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Identified intangible assets included discount rates | 9.00% |  |  |  |  |  |  |  |  |  |
Marvell Technology Group Ltd [Member] | Asset Purchase Agreement [Member] | Developed Technology [Member] |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Acquired intangible assets | $ 24.9 |  |  |  |  |  |  |  |  |  |
Acquired intangible assets amortize over an estimated weighted average useful life | 4 years |  |  |  |  |  |  |  |  |  |
Marvell Technology Group Ltd [Member] | Asset Purchase Agreement [Member] | Customer Relationships [Member] |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Acquired intangible assets | $ 16.2 |  |  |  |  |  |  |  |  |  |
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 | $ 1.0 |  |  |  |  |  |  |  |  |  |
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 | $ 3.6 |  |  |  |  |  |  |  |  |  |

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