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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Thousands	12 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2017
Statement of Comprehensive Income [Abstract]
Net income (loss) including noncontrolling interest	$ (14,638)	$ 4,948	$ 9,260
Other comprehensive loss, net of tax, foreign currency translation adjustment	(5,937)	244	(1,012)
Comprehensive income (loss)	(20,575)	5,192	8,248
Noncontrolling interest	(19,303)	(9,205)	(5,118)
Comprehensive income (loss) attributable to Alpha and Omega Semiconductor Limited	$ (1,272)	$ 14,397	$ 13,366

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