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Segment and Geographic Information - Revenue by Location and Product Type (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Mar. 31, 2018 | Mar. 31, 2017 | Mar. 31, 2018 | Mar. 31, 2017
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |
Revenue | $ 102,902 | $ 93,281 | $ 311,656 | $ 285,330
Power discrete |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |
Revenue | 83,982 | 70,794 | 252,754 | 212,044
Power IC |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |
Revenue | 15,685 | 19,309 | 49,540 | 64,166
Packaging and testing services |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |
Revenue | 3,235 | 3,178 | 9,362 | 9,120
Hong Kong |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |
Revenue | 84,632 | 75,785 | 252,302 | 236,873
China |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |
Revenue | 15,849 | 15,334 | 52,122 | 42,159
South Korea |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |
Revenue | 243 | 294 | 831 | 1,053
United States |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |
Revenue | 1,358 | 1,075 | 4,050 | 2,767
Other countries |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |
Revenue | $ 820 | $ 793 | $ 2,351 | $ 2,478

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