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Revenue - Disaggregation of Revenue (Details) - USD ($) $ in Thousands | 12 Months Ended
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Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2017
Disaggregation of Revenue [Line Items] |  |  |
Revenue | $ 450,920 | $ 421,553 | $ 383,337
Hong Kong |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue | 355,058 | 340,178 | 315,223
China |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue | 81,955 | 71,213 | 59,360
South Korea |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue | 2,590 | 1,061 | 1,505
United States |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue | 7,015 | 5,658 | 4,037
Other countries |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue | 4,302 | 3,443 | 3,212
Power discrete [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue | 371,837 | 342,148 | 288,788
Power IC [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue | 70,215 | 67,083 | 82,389
Packaging and testing services [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue | $ 8,868 | $ 12,322 | $ 12,160

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- Definition Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130543-203045 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130545-203045 + Details
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