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Acquisitions - Additional Information (Detail) - USD ($) $ in Millions |  |  |  | 1 Months Ended | 2 Months Ended | 3 Months Ended
--- | --- | --- | --- | --- | --- | ---
Sep. 08, 2017 | Jul. 25, 2017 | Jun. 11, 2017 | Sep. 30, 2017 | Sep. 30, 2017 | Sep. 30, 2017 | Sep. 30, 2016
Business Acquisition [Line Items] |  |  |  |  |  |  |
Acquired intangible assets amortize over an estimated weighted average useful life |  |  |  |  |  | 4 years 4 months 24 days |
Net revenue |  |  |  |  |  | $ 417.4 | $ 386.2
Operating loss |  |  |  |  |  | $ 16.9 | $ (5.6)
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 |  |  |  |  |  | 3 months 19 days |
Conexant Systems, LLC [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Acquired intangible assets |  |  | $ 152.5 |  |  |  |
Conexant Systems, LLC [Member] | Stock Purchase Agreement [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Acquisition agreement date |  |  | Jun. 11, 2017 |  |  |  |
Acquisition closing effective date |  | Jul. 25, 2017 |  |  |  |  |
Acquired outstanding common and preferred shares and voting interest |  | 100.00% |  |  |  |  |
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 |  | 2.3 |  |  |  |  |
Business combination, consideration transferred |  | 345.7 |  |  |  |  |
Acquired intangible assets |  |  | $ 152.5 |  |  |  |
Net revenue |  |  |  |  | $ 23.2 |  |
Operating loss |  |  |  |  | $ 14.9 |  |
Conexant Systems, LLC [Member] | Stock Purchase Agreement [Member] | Maximum [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Identified intangible assets included discount rates |  |  | 14.00% |  |  |  |
Conexant Systems, LLC [Member] | Stock Purchase Agreement [Member] | Minimum [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Identified intangible assets included discount rates |  |  | 9.00% |  |  |  |
Conexant Systems, LLC [Member] | Stock Purchase Agreement [Member] | Developed Technology [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Acquired intangible assets |  |  | $ 100.0 |  |  |  |
Acquired intangible assets amortize over an estimated weighted average useful life |  |  | 5 years |  |  |  |
Conexant Systems, LLC [Member] | Stock Purchase Agreement [Member] | Customer Relationships [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Acquired intangible assets |  |  | $ 32.1 |  |  |  |
Acquired intangible assets amortize over an estimated weighted average useful life |  |  | 4 years |  |  |  |
Conexant Systems, LLC [Member] | Stock Purchase Agreement [Member] | Trademarks [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Acquired intangible assets |  |  | $ 4.8 |  |  |  |
Acquired intangible assets amortize over an estimated weighted average useful life |  |  | 7 years |  |  |  |
Conexant Systems, LLC [Member] | Stock Purchase Agreement [Member] | Backlog [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Acquired intangible assets |  |  | $ 0.3 |  |  |  |
Conexant Systems, LLC [Member] | Stock 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] | Stock Purchase Agreement [Member] | In-Process Research and Development [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Acquired intangible assets |  |  | $ 15.3 |  |  |  |
Conexant Systems, LLC [Member] | Stock 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 |  |  | $ 45.6 |  |  |  |
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 |  |  | $ 45.6 |  |  |  |
Net revenue |  |  |  | $ 15.7 |  |  |
Operating loss |  |  |  | $ 4.1 |  |  |
Marvell Technology Group Ltd [Member] | Asset Purchase Agreement [Member] | Maximum [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Identified intangible assets included discount rates |  |  | 18.00% |  |  |  |
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 |  |  | $ 17.4 |  |  |  |
Acquired intangible assets amortize over an estimated weighted average useful life |  |  | 3 years |  |  |  |
Marvell Technology Group Ltd [Member] | Asset Purchase Agreement [Member] | Customer Relationships [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Acquired intangible assets |  |  | $ 12.7 |  |  |  |
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 |  |  | $ 1.2 |  |  |  |
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 |  |  | $ 14.3 |  |  |  |

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