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Segment and Geographic Information - Revenue by Location and Product Type (Details) - USD ($) $ in Thousands		3 Months Ended
	Sep. 30, 2024	Sep. 30, 2024	Sep. 30, 2023
Revenues from External Customers and Long-Lived Assets
Revenue		$ 181,887	$ 180,633
Power discrete
Revenues from External Customers and Long-Lived Assets
Revenue		122,454	121,500
Power IC
Revenues from External Customers and Long-Lived Assets
Revenue		52,940	52,747
Packaging and testing services and other
Revenues from External Customers and Long-Lived Assets
Revenue		852	745
License and development services
Revenues from External Customers and Long-Lived Assets
Revenue	$ 36,800	5,641	5,641
Hong Kong
Revenues from External Customers and Long-Lived Assets
Revenue		153,495	141,206
China
Revenues from External Customers and Long-Lived Assets
Revenue		21,255	26,619
South Korea
Revenues from External Customers and Long-Lived Assets
Revenue		290	5,311
United States
Revenues from External Customers and Long-Lived Assets
Revenue		1,073	1,395
Other countries
Revenues from External Customers and Long-Lived Assets
Revenue		$ 5,774	$ 6,102

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