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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 |
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Dec. 31, 2017 | Jun. 30, 2017
Finite-Lived Intangible Assets [Line Items] |  |
Acquired intangibles, gross | $ 459.7 | $ 282.0
Accumulated amortization | (196.2) | (181.0)
Acquired intangibles, net | $ 263.5 | 101.0
Weighted Average Life in Years | 4 years 9 months 18 days |
Display Driver Technology [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Acquired intangibles, gross | $ 164.0 | 164.0
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 | $ 147.0 |
Weighted Average Life in Years | 5 years |
Customer Relationships [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Acquired intangibles, gross | $ 73.1 | 48.4
Weighted Average Life in Years | 3 years 7 months 6 days |
Fingerprint Authentication Technology [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Acquired intangibles, gross | $ 55.7 | 63.5
Weighted Average Life in Years | 4 years |
Licensed Technology and Other [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Acquired intangibles, gross | $ 9.0 | 1.3
Weighted Average Life in Years | 4 years 3 months 19 days |
Tradename [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Acquired intangibles, gross | $ 4.8 |
Weighted Average Life in Years | 7 years |
Patents [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Acquired intangibles, gross | $ 4.6 | $ 4.8
Weighted Average Life in Years | 7 years 8 months 12 days |
Backlog [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Acquired intangibles, gross | $ 1.5 |
Weighted Average Life in Years | 6 months |

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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://www.xbrl.org/2003/role/presentationRef -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/presentationRef -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/presentationRef -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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