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Segment and Geographic Information - Revenue by Location and Product Type (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2024	Dec. 31, 2023
Revenues from External Customers and Long-Lived Assets
Revenue	$ 173,156	$ 165,285	$ 355,043	$ 345,918
Power discrete
Revenues from External Customers and Long-Lived Assets
Revenue	112,956	108,780	235,410	230,280
Power IC
Revenues from External Customers and Long-Lived Assets
Revenue	53,735	50,295	106,675	103,042
Packaging and testing services and other
Revenues from External Customers and Long-Lived Assets
Revenue	1,064	744	1,916	1,489
License and development services
Revenues from External Customers and Long-Lived Assets
Revenue	5,401	5,466	11,042	11,107
Hong Kong
Revenues from External Customers and Long-Lived Assets
Revenue	150,640	124,081	304,135	265,287
China
Revenues from External Customers and Long-Lived Assets
Revenue	15,915	30,543	37,170	57,162
South Korea
Revenues from External Customers and Long-Lived Assets
Revenue	409	4,033	699	9,344
United States
Revenues from External Customers and Long-Lived Assets
Revenue	699	1,005	1,772	2,400
Other countries
Revenues from External Customers and Long-Lived Assets
Revenue	$ 5,493	$ 5,623	$ 11,267	$ 11,725

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