Schedule I - Condensed Unconsolidated Statements of Income (Details) - USD ($) $ in Thousands	12 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2018
Condensed Financial Statements, Captions [Line Items]
Cost of revenue	$ 362,178	$ 335,542	$ 309,625
Gross profit	102,731	115,378	111,928
Operating expenses:
Selling, general and administrative	64,816	75,967	66,164
Total operating expenses	116,668	122,398	103,508
Operating loss	(13,937)	(7,020)	8,420
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 attributable to Alpha and Omega Semiconductor Limited	(6,596)	1,861	14,263
Parent Company
Condensed Financial Statements, Captions [Line Items]
Revenue	1,334	4,292	4,096
Cost of revenue	0	0	0
Gross profit	1,334	4,292	4,096
Operating expenses:
Selling, general and administrative	1,745	4,599	4,479
Total operating expenses	1,745	4,599	4,479
Operating loss	(411)	(307)	(383)
Interest expense and other income (loss), net	(1)	3	7
Income (loss) on equity investment in subsidiaries	(17,845)	(14,334)	5,324
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 attributable to Alpha and Omega Semiconductor Limited	$ (6,596)	$ 1,861	$ 14,263