Schedule I - Condensed Unconsolidated Statements of Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	12 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2018
Accumulated Other Comprehensive Income (Loss) [Line Items]
Net income (loss) including noncontrolling interest	$ (18,257)	$ (14,638)	$ 4,948
Other comprehensive income (loss), net of tax, foreign currency translation adjustment	(4,839)	(5,937)	244
Comprehensive income (loss)	(23,096)	(20,575)	5,192
Noncontrolling interest	(14,066)	(19,303)	(9,205)
Comprehensive income (loss) attributable to Alpha and Omega Semiconductor Limited	(9,030)	(1,272)	14,397
Parent Company
Accumulated Other Comprehensive Income (Loss) [Line Items]
Net income (loss) including noncontrolling interest	(18,257)	(14,638)	4,948
Other comprehensive income (loss), net of tax, foreign currency translation adjustment	(4,839)	(5,937)	244
Comprehensive income (loss)	(23,096)	(20,575)	5,192
Noncontrolling interest	(14,066)	(19,303)	(9,205)
Comprehensive income (loss) attributable to Alpha and Omega Semiconductor Limited	$ (9,030)	$ (1,272)	$ 14,397