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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, 2022
Mar. 31, 2021
Mar. 31, 2022
Mar. 31, 2021
Revenues from External Customers and Long-Lived Assets [Line Items]        
Revenue $ (203,239) $ (169,212) $ (583,593) $ (479,593)
Power discrete        
Revenues from External Customers and Long-Lived Assets [Line Items]        
Revenue (140,572) (122,615) (406,235) (355,487)
Power IC        
Revenues from External Customers and Long-Lived Assets [Line Items]        
Revenue (60,359) (43,385) (167,782) (115,224)
Packaging and testing services        
Revenues from External Customers and Long-Lived Assets [Line Items]        
Revenue (2,308) (3,212) (9,576) (8,882)
Hong Kong        
Revenues from External Customers and Long-Lived Assets [Line Items]        
Revenue (164,555) (139,167) (472,399) (396,879)
Hong Kong | Revision of Prior Period, Adjustment        
Revenues from External Customers and Long-Lived Assets [Line Items]        
Revenue   500   3,900
China        
Revenues from External Customers and Long-Lived Assets [Line Items]        
Revenue (31,883) (28,110) (91,958) (74,250)
China | Revision of Prior Period, Adjustment        
Revenues from External Customers and Long-Lived Assets [Line Items]        
Revenue   (100)   (200)
South Korea        
Revenues from External Customers and Long-Lived Assets [Line Items]        
Revenue (2,745) (473) (8,862) (4,069)
South Korea | Revision of Prior Period, Adjustment        
Revenues from External Customers and Long-Lived Assets [Line Items]        
Revenue   (400)   (3,700)
United States        
Revenues from External Customers and Long-Lived Assets [Line Items]        
Revenue (3,534) (1,088) (9,004) (3,683)
Other countries        
Revenues from External Customers and Long-Lived Assets [Line Items]        
Revenue $ (522) $ (374) $ (1,370) $ (712)