Income Taxes - Narrative (Details) - USD ($) $ in Thousands	12 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Feb. 29, 2020	Oct. 31, 2019
Income Tax Disclosure [Line Items]
Decrease in tax credit carryforward, valuation allowance	$ 3,900	$ 4,700
Deferred income tax assets-net	54,898	41,126
Tax Cuts and Jobs Act of 2017, U.S. deferred tax assets and liabilities write-down		12,900
Tax Cuts and Jobs Act of 2017, Transition tax for accumulated foreign earnings		2,800
Tax Cuts And Jobs Act of 2017, Foreign derived intangible income, income tax benefit	1,900
Unrecognized tax benefits that would impact effective tax rate, if recognized	13,400	18,600
Unrecognized tax benefits, income tax penalties and interest accrued	2,100	1,500
Decrease in unrecognized tax benefits is reasonably possible	1,200
Taiwan Tax Authority
Income Tax Disclosure [Line Items]
Income tax examination, increase (decrease) liability			$ 1,000	$ 1,600
Research Tax Credit Carryforward | California Franchise Tax Board
Income Tax Disclosure [Line Items]
Excess tax credits, valuation allowance	30,800	26,400
Research Tax Credit Carryforward | Federal
Income Tax Disclosure [Line Items]
Excess tax credits, valuation allowance	24,300	$ 20,900
Research Tax Credit Carryforward | State and local jurisdiction
Income Tax Disclosure [Line Items]
State research and development tax credit carryforwards	$ 40,100