CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Thousands	12 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2018
Statement of Comprehensive Income [Abstract]
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