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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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