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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 | 3 Months Ended |
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Sep. 30, 2019 | Jun. 30, 2019
Finite-Lived Intangible Assets [Line Items] |  |
Acquired intangibles, Gross Carrying Value | $ 398.3 | $ 445.5
Acquired intangibles, Accumulated Amortization | (271.7) | (300.7)
Acquired intangibles, Net Carrying Value | $ 126.6 | 144.8
Weighted Average Life in Years | 4 years 10 months 24 days |
Display Driver Technology [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Acquired intangibles, Gross Carrying Value | $ 164.0 | 164.0
Acquired intangibles, Accumulated Amortization | (155.9) | (148.1)
Acquired intangibles, Net Carrying Value | $ 8.1 | 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 | (56.1) | (49.4)
Acquired intangibles, Net Carrying Value | $ 82.5 | 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 | (52.8) | (49.9)
Acquired intangibles, Net Carrying Value | $ 29.0 | 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 | (4.1) | (3.6)
Acquired intangibles, Net Carrying Value | $ 3.6 | 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 | (2.2) | (2.0)
Acquired intangibles, Net Carrying Value | $ 2.2 | 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 |

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- 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 + Details
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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 + Details
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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 Reference 2: 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 + Details
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