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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 | 9 Months Ended
--- | --- | ---
Mar. 31, 2016 | Mar. 31, 2015 | Mar. 31, 2016 | Mar. 31, 2015
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |
Net revenue | $ 402.5 | $ 477.6 | $ 1,343.0 | $ 1,224.1
Japan [Member] |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |
Net revenue | 111.6 | 228.0 | 581.3 | 464.9
China [Member] |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |
Net revenue | 152.6 | 112.3 | 384.4 | 386.8
United States [Member] |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |
Net revenue | 90.0 | 71.0 | 207.3 | 153.3
South Korea [Member] |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |
Net revenue | 33.8 | 29.5 | 122.0 | 108.3
Taiwan [Member] |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |
Net revenue | 12.8 | 34.8 | 45.8 | 103.2
Other [Member] |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |
Net revenue | $ 1.7 | $ 2.0 | $ 2.2 | $ 7.6

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