Segment and Geographic Information - Revenue by Location and Product Type (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2021	Dec. 31, 2020
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	$ (193,319)	$ (158,830)	$ (380,354)	$ (310,381)
Power discrete
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	(134,975)	(118,500)	(265,663)	(232,872)
Power IC
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	(55,093)	(37,381)	(107,423)	(71,839)
Packaging and testing services
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	(3,251)	(2,949)	(7,268)	(5,670)
Hong Kong
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	(159,189)	(132,204)	(307,844)	(257,712)
Hong Kong | Revision of Prior Period, Adjustment
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue		2,300		3,400
China
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	(27,235)	(22,877)	(60,075)	(46,140)
China | Revision of Prior Period, Adjustment
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue				(100)
South Korea
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	(3,263)	(2,422)	(6,117)	(3,596)
South Korea | Revision of Prior Period, Adjustment
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue		(2,300)		(3,300)
United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	(3,165)	(1,139)	(5,470)	(2,595)
Other countries
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	$ (467)	$ (188)	$ (848)	$ (338)