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Schedule I - Condensed Unconsolidated Statements of Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	12 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2017
Accumulated Other Comprehensive Income (Loss) [Line Items]
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
Parent Company
Accumulated Other Comprehensive Income (Loss) [Line Items]
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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