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Segment, Customers, and Geographic Information - Net Revenue within Geographic Areas Based on Customers' Locations (Detail) - USD ($) $ in Millions | 3 Months Ended
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Sep. 30, 2017 | Sep. 30, 2016
Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Net revenue | $ 417.4 | $ 386.2
China [Member] |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Net revenue | 209.7 | 178.3
Japan [Member] |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Net revenue | 91.0 | 74.0
United States [Member] |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Net revenue | 36.2 | 64.3
South Korea [Member] |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Net revenue | 21.2 | 51.1
Taiwan [Member] |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Net revenue | 43.2 | 14.8
Other [Member] |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Net revenue | $ 16.1 | $ 3.7

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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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