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Acquired Intangibles and Goodwill - Summary of Life, Gross Carrying Value and Related Accumulated Amortization of Acquired Intangible Assets (Detail) - USD ($) $ in Millions	6 Months Ended
	Dec. 31, 2019	Jun. 30, 2019
Finite-Lived Intangible Assets [Line Items]
Acquired intangibles, Gross Carrying Value	$ 398.3	$ 445.5
Acquired intangibles, Accumulated Amortization	(282.8)	(300.7)
Acquired intangibles, Net Carrying Value	$ 115.5	144.8
Weighted Average Life in Years	3 years 1 month 6 days
Display Driver Technology [Member]
Finite-Lived Intangible Assets [Line Items]
Acquired intangibles, Gross Carrying Value	$ 164.0	164.0
Acquired intangibles, Accumulated Amortization	(156.7)	(148.1)
Acquired intangibles, Net Carrying Value	$ 7.3	15.9
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	$ 138.6	138.6
Acquired intangibles, Accumulated Amortization	(62.9)	(49.4)
Acquired intangibles, Net Carrying Value	$ 75.7	89.2
Weighted Average Life in Years	5 years 3 months 18 days
Customer Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Acquired intangibles, Gross Carrying Value	$ 81.8	81.8
Acquired intangibles, Accumulated Amortization	(55.7)	(49.9)
Acquired intangibles, Net Carrying Value	$ 26.1	31.9
Weighted Average Life in Years	4 years 1 month 6 days
Fingerprint Authentication Technology [Member]
Finite-Lived Intangible Assets [Line Items]
Acquired intangibles, Gross Carrying Value		47.2
Acquired intangibles, Accumulated Amortization		(47.2)
Licensed Technology and Other [Member]
Finite-Lived Intangible Assets [Line Items]
Acquired intangibles, Gross Carrying Value	$ 7.7	7.7
Acquired intangibles, Accumulated Amortization	(4.6)	(3.6)
Acquired intangibles, Net Carrying Value	$ 3.1	4.1
Weighted Average Life in Years	4 years 2 months 12 days
Patents [Member]
Finite-Lived Intangible Assets [Line Items]
Acquired intangibles, Gross Carrying Value	$ 4.4	4.4
Acquired intangibles, Accumulated Amortization	(2.3)	(2.0)
Acquired intangibles, Net Carrying Value	$ 2.1	2.4
Weighted Average Life in Years	8 years 1 month 6 days
Tradename [Member]
Finite-Lived Intangible Assets [Line Items]
Acquired intangibles, Gross Carrying Value	$ 1.8	1.8
Acquired intangibles, Accumulated Amortization	(0.6)	(0.5)
Acquired intangibles, Net Carrying Value	$ 1.2	$ 1.3
Weighted Average Life in Years	7 years

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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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.

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-Name Accounting Standards Codification
-Topic 350
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