Short-term and Long-term Debt - Activities Under Short-term and Long-term Debt (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Jun. 30, 2022
Secured debt | 2021 E.SUN Bank Credit Facility | Term loan
Short-term Debt [Line Items]
Credit facility, remaining borrowing capacity	$ 0	$ 10,766
Interest rate (as a percent)	1.495%	1.37%
Secured debt | Chang Hwa Bank Credit Facility due October 15, 2026 | Term loan
Short-term Debt [Line Items]
Credit facility, remaining borrowing capacity	$ 0	$ 0
Interest rate (as a percent)	1.30%	1.175%
Secured debt | CTBC Bank term loan, due June 4, 2030 | Term loan
Short-term Debt [Line Items]
Credit facility, remaining borrowing capacity	$ 0	$ 0
Interest rate (as a percent)	0.95%	0.825%
Secured debt | 2021 CTBC Credit Lines, due August 15, 2026 | Term loan
Short-term Debt [Line Items]
Credit facility, remaining borrowing capacity	$ 5,193	$ 6,308
Interest rate (as a percent)	1.15%	1.025%
Secured debt | 2022 ESUN Bank Credit Facility, due August 15, 2027 | Term loan
Short-term Debt [Line Items]
Credit facility, remaining borrowing capacity	$ 0	$ 0
Interest rate (as a percent)	1.495%	0.00%
Secured debt | Mega Bank Credit Facility, due September 15, 2026 | Term loan
Short-term Debt [Line Items]
Credit facility, remaining borrowing capacity	$ 0	$ 0
Secured debt | Mega Bank Credit Facility, due September 15, 2026 | Term loan | Minimum
Short-term Debt [Line Items]
Interest rate (as a percent)	1.145%	1.02%
Secured debt | Mega Bank Credit Facility, due September 15, 2026 | Term loan | Maximum
Short-term Debt [Line Items]
Interest rate (as a percent)	1.345%	1.22%
Line of Credit | Revolving Credit Facility | 2018 Bank of America Credit Facility
Short-term Debt [Line Items]
Credit facility, remaining borrowing capacity	$ 289,716	$ 81,755
Interest rate (as a percent)	4.03%	2.53%
Line of Credit | Revolving Credit Facility | 2022 Bank of America Credit Facility
Short-term Debt [Line Items]
Credit facility, remaining borrowing capacity	$ 20,000	$ 10,500
Interest rate (as a percent)	3.36%	1.85%
Line of Credit | Revolving Credit Facility | Cathay Bank Line of Credit
Short-term Debt [Line Items]
Credit facility, remaining borrowing capacity	$ 132,000	$ 102,000
Interest rate (as a percent)	4.328%	4.004%
Line of Credit | Revolving Credit Facility | 2021 CTBC Credit Lines
Short-term Debt [Line Items]
Credit facility, remaining borrowing capacity	$ 105,000	$ 20,200
Line of Credit | Revolving Credit Facility | 2021 CTBC Credit Lines | Minimum
Short-term Debt [Line Items]
Interest rate (as a percent)	1.80%	1.80%
Line of Credit | Revolving Credit Facility | 2021 CTBC Credit Lines | Maximum
Short-term Debt [Line Items]
Interest rate (as a percent)	2.52%	2.52%
Line of Credit | Revolving Credit Facility | Chang Hwa Bank Credit Facility
Short-term Debt [Line Items]
Credit facility, remaining borrowing capacity	$ 20,000	$ 20,000
Interest rate (as a percent)	5.14%	3.50%
Line of Credit | Revolving Credit Facility | HSBC Bank Credit Facility
Short-term Debt [Line Items]
Credit facility, remaining borrowing capacity	$ 19,000	$ 0
Interest rate (as a percent)	3.84%
Line of Credit | Revolving Credit Facility | HSBC Bank Credit Facility | Minimum
Short-term Debt [Line Items]
Interest rate (as a percent)		1.95%
Line of Credit | Revolving Credit Facility | HSBC Bank Credit Facility | Maximum
Short-term Debt [Line Items]
Interest rate (as a percent)		2.20%
Line of Credit | Revolving Credit Facility | 2021 E.SUN Bank Credit Facility
Short-term Debt [Line Items]
Credit facility, remaining borrowing capacity	$ 0	$ 22,200
Interest rate (as a percent)	1.81%	1.81%
Line of Credit | Revolving Credit Facility | 2022 E.SUN Bank Credit Facility
Short-term Debt [Line Items]
Credit facility, remaining borrowing capacity	$ 21,000	$ 0
Interest rate (as a percent)	4.18%	0.00%
Line of Credit | Revolving Credit Facility | Mega Bank Credit Facility
Short-term Debt [Line Items]
Credit facility, remaining borrowing capacity	$ 20,000	$ 16,500
Interest rate (as a percent)	2.55%	1.85%