CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2018
Income Statement [Abstract]
Revenue	$ 464,909	$ 450,920	$ 421,553
Cost of goods sold	362,178	335,542	309,625
Gross profit	102,731	115,378	111,928
Operating expenses:
Research and development	51,252	46,431	37,344
Selling, general and administrative	64,816	75,967	66,164
Impairment of privately-held investment	600	0	0
Total operating expenses	116,668	122,398	103,508
Operating income (loss)	(13,937)	(7,020)	8,420
Interest expense and other income (loss), net	(3,972)	(6,362)	(2,764)
Net income (loss) before income taxes	(17,909)	(13,382)	5,656
Income tax expense	348	1,256	708
Net income (loss) including noncontrolling interest	(18,257)	(14,638)	4,948
Net loss attributable to noncontrolling interest	(11,661)	(16,499)	(9,315)
Net income (loss) attributable to Alpha and Omega Semiconductor Limited	$ (6,596)	$ 1,861	$ 14,263
Net income (loss) per common share attributable to Alpha and Omega Semiconductor Limited
Basic (in dollars per share)	$ (0.27)	$ 0.08	$ 0.60
Diluted (in dollars per share)	$ (0.27)	$ 0.08	$ 0.57
Weighted average number of common share attributable to Alpha and Omega Semiconductor Limited used to compute net income (loss) per share:
Basic (in shares)	24,840	24,063	23,901
Diluted (in shares)	24,840	24,698	24,844