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Segment and Geographic Information - Revenue by Location and Product Type (Details) - USD ($) $ in Thousands	3 Months Ended
	Sep. 30, 2025	Sep. 30, 2024
Revenues from External Customers and Long-Lived Assets
Revenue	$ 182,501	$ 181,887
Power discrete
Revenues from External Customers and Long-Lived Assets
Revenue	108,506	122,454
Power IC
Revenues from External Customers and Long-Lived Assets
Revenue	72,708	52,940
Packaging and testing services and other
Revenues from External Customers and Long-Lived Assets
Revenue	1,287	852
License and development services
Revenues from External Customers and Long-Lived Assets
Revenue	0	5,641
Hong Kong
Revenues from External Customers and Long-Lived Assets
Revenue	178,411	153,495
China
Revenues from External Customers and Long-Lived Assets
Revenue	2,357	21,255
South Korea
Revenues from External Customers and Long-Lived Assets
Revenue	479	290
United States
Revenues from External Customers and Long-Lived Assets
Revenue	1,125	1,073
Other countries
Revenues from External Customers and Long-Lived Assets
Revenue	$ 129	$ 5,774

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