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Acquired Intangibles - Summary of Life, Gross Carrying Value of Acquired Intangible Assets, and Related Accumulated Amortization (Detail) - USD ($) $ in Millions	12 Months Ended
	Jun. 30, 2018	Jun. 24, 2017
Finite-Lived Intangible Assets [Line Items]
Acquired intangibles, Gross Carrying Value	$ 456.1	$ 282.0
Acquired intangibles, Accumulated Amortization	(236.9)	(181.0)
Acquired intangibles, Net Carrying Value	$ 219.2	101.0
Weighted Average Life in Years	5 years
Display Driver Technology [Member]
Finite-Lived Intangible Assets [Line Items]
Acquired intangibles, Gross Carrying Value	$ 164.0	164.0
Acquired intangibles, Accumulated Amortization	(116.5)	(84.9)
Acquired intangibles, Net Carrying Value	$ 47.5	79.1
Weighted Average Life in Years	5 years 3 months 18 days
Audio and Video Technology [Member]
Finite-Lived Intangible Assets [Line Items]
Acquired intangibles, Gross Carrying Value	$ 133.9
Acquired intangibles, Accumulated Amortization	(22.8)
Acquired intangibles, Net Carrying Value	$ 111.1
Weighted Average Life in Years	5 years 6 months
Fingerprint Authentication Technology [Member]
Finite-Lived Intangible Assets [Line Items]
Acquired intangibles, Gross Carrying Value	$ 55.7	63.5
Acquired intangibles, Accumulated Amortization	(53.7)	(47.6)
Acquired intangibles, Net Carrying Value	$ 2.0	15.9
Weighted Average Life in Years	4 years
Customer Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Acquired intangibles, Gross Carrying Value	$ 81.8	48.4
Acquired intangibles, Accumulated Amortization	(38.5)	(46.0)
Acquired intangibles, Net Carrying Value	$ 43.3	2.4
Weighted Average Life in Years	4 years 1 month 6 days
Licensed Technology and Other [Member]
Finite-Lived Intangible Assets [Line Items]
Acquired intangibles, Gross Carrying Value	$ 9.0	1.3
Acquired intangibles, Accumulated Amortization	(3.0)	(1.3)
Acquired intangibles, Net Carrying Value	$ 6.0
Weighted Average Life in Years	4 years 3 months 18 days
Tradename [Member]
Finite-Lived Intangible Assets [Line Items]
Acquired intangibles, Gross Carrying Value	$ 1.9
Acquired intangibles, Accumulated Amortization	(0.2)
Acquired intangibles, Net Carrying Value	$ 1.7
Weighted Average Life in Years	7 years
Patents [Member]
Finite-Lived Intangible Assets [Line Items]
Acquired intangibles, Gross Carrying Value	$ 4.6	4.8
Acquired intangibles, Accumulated Amortization	(1.7)	(1.2)
Acquired intangibles, Net Carrying Value	$ 2.9	$ 3.6
Weighted Average Life in Years	7 years 8 months 12 days
Backlog [Member]
Finite-Lived Intangible Assets [Line Items]
Acquired intangibles, Gross Carrying Value	$ 0.5
Acquired intangibles, Accumulated Amortization	$ (0.5)
Weighted Average Life in Years	6 months
In-Process Research and Development [Member]
Finite-Lived Intangible Assets [Line Items]
Acquired intangibles, Gross Carrying Value	$ 4.7
Acquired intangibles, Net Carrying Value	$ 4.7

X

- Definition

Weighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 50
-Paragraph 1
-Subparagraph (a)(3)
-URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275

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- Definition

Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 50
-Paragraph 2
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275

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- Definition

Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 928
-SubTopic 340
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6473545&loc=d3e61844-108004

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Amount after amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
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-Section 50
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