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Segment and Geographic Information - Revenue by Location and Product Type (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
	Mar. 31, 2024	Mar. 31, 2024	Mar. 31, 2023	Mar. 31, 2024	Mar. 31, 2023
Revenues from External Customers and Long-Lived Assets
Revenue		$ 150,060	$ 132,560	$ 495,978	$ 529,796
Power discrete
Revenues from External Customers and Long-Lived Assets
Revenue		93,815	80,962	324,093	363,117
Power IC
Revenues from External Customers and Long-Lived Assets
Revenue		49,990	47,416	153,032	159,708
Packaging and testing services and other
Revenues from External Customers and Long-Lived Assets
Revenue		1,204	552	2,694	3,341
License and development services
Revenues from External Customers and Long-Lived Assets
Revenue	$ 26,100	5,051	3,630	16,159	3,630
Hong Kong
Revenues from External Customers and Long-Lived Assets
Revenue		123,731	106,940	389,018	438,537
China
Revenues from External Customers and Long-Lived Assets
Revenue		19,108	14,360	76,270	58,104
South Korea
Revenues from External Customers and Long-Lived Assets
Revenue		326	1,083	9,670	7,622
United States
Revenues from External Customers and Long-Lived Assets
Revenue		1,728	4,245	4,128	16,701
Other countries
Revenues from External Customers and Long-Lived Assets
Revenue		$ 5,167	$ 5,932	$ 16,892	$ 8,832

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
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Reference 4: http://www.xbrl.org/2003/role/disclosureRef
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Reference 6: http://www.xbrl.org/2003/role/disclosureRef
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Reference 10: http://www.xbrl.org/2003/role/disclosureRef
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Reference 11: http://www.xbrl.org/2003/role/disclosureRef
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