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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. 27, 2020	Jun. 29, 2019
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	$ 398.3	$ 445.5
Accumulated Amortization	(304.9)	(300.7)
Net Carrying Value	$ 93.4	144.8
Weighted Average Life in Years	4 years 4 months 24 days
Display Driver Technology [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	$ 164.0	164.0
Accumulated Amortization	(158.2)	(148.1)
Net Carrying Value	$ 5.8	15.9
Weighted Average Life in Years	5 years 3 months 18 days
Audio and Video Technology [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	$ 138.6	138.6
Accumulated Amortization	(76.5)	(49.4)
Net Carrying Value	$ 62.1	89.2
Weighted Average Life in Years	5 years 3 months 19 days
Fingerprint Authentication Technology [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value		47.2
Accumulated Amortization		(47.2)
Weighted Average Life in Years	4 years 8 months 12 days
Customer Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	$ 81.8	81.8
Accumulated Amortization	(61.4)	(49.9)
Net Carrying Value	$ 20.4	31.9
Weighted Average Life in Years	4 years 1 month 6 days
Licensed Technology and Other [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	$ 7.7	7.7
Accumulated Amortization	(5.5)	(3.6)
Net Carrying Value	$ 2.2	4.1
Weighted Average Life in Years	4 years 2 months 12 days
Tradename [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	$ 1.8	1.8
Accumulated Amortization	(0.7)	(0.5)
Net Carrying Value	$ 1.1	1.3
Weighted Average Life in Years	7 years
Patents [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	$ 4.4	4.4
Accumulated Amortization	(2.6)	(2.0)
Net Carrying Value	$ 1.8	$ 2.4
Weighted Average Life in Years	8 years 1 month 6 days

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://www.xbrl.org/2003/role/disclosureRef
-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
-SubTopic 30
-Section 50
-Paragraph 2
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