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Revenue - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	12 Months Ended
	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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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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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

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