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Segment, Customers, and Geographic Information - Net Revenue from External Customers (Detail) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016
Revenue from External Customer [Line Items] |  |  |  |
Net revenue | $ 430.4 | $ 461.3 | $ 847.8 | $ 847.5
Mobile Product Applications [Member] |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Net revenue | 261.8 | 376.6 | 554.7 | 690.6
PC Product Applications [Member] |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Net revenue | 61.7 | 63.8 | 127.0 | 118.7
Internet of Things Product Applications [Member] |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Net revenue | $ 106.9 | $ 20.9 | $ 166.1 | $ 38.2

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- Definition Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
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