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Segment and Geographic information (Tables)
 12 Months Ended
Jun. 30, 2025
Segment Reporting [Abstract]  
Schedule of Revenue from External Customers and Long-Lived Assets, by Geographical Areas
The revenue by geographical location in the following tables is based on the country or region in which the products were shipped to: 
 Year Ended June 30, 
 202520242023
(in thousands)
Hong Kong$617,574 $524,788 $561,855 
China58,514 95,417 84,546 
South Korea1,691 9,956 9,168 
United States4,093 4,938 19,744 
Other countries14,290 22,175 16,008 
 $696,162 $657,274 $691,321 

The following is a summary of revenue by product type:
 Year Ended June 30, 
 202520242023
 (in thousands)
Power discrete$449,507 $426,146 $458,795 
Power IC229,926 205,778 218,620 
Packaging and testing services and other
2,888 4,119 3,979 
License and development services13,841 21,231 9,927 
 $696,162 $657,274 $691,321 
Long-lived assets, net consisting of property, plant and equipment and land use rights, net, as well as operating lease right-of-use assets, net by geographical area are as follows:
 June 30,
 20252024
(in thousands)
China$99,389 $106,666 
United States230,518 249,791 
Other countries5,478 5,212 
 $335,385 $361,669