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Net Income (Loss) Per Share - Basic and Diluted Income Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2018	Mar. 31, 2017
Numerator:
Net income attributable to Alpha and Omega Semiconductor Limited	$ 1,651	$ 3,556	$ 13,242	$ 9,710
Basic:
Weighted average number of common shares used to compute basic net income per share	23,795	23,675	23,914	23,396
Effect of potentially dilutive securities:
Stock options, RSUs and ESPP shares	960	1,276	1,002	1,385
Weighted average number of common shares used to compute diluted net income per share	24,755	24,951	24,916	24,781
Net income per share attributable to Alpha and Omega Semiconductor Limited:
Basic (in dollars per share)	$ 0.07	$ 0.15	$ 0.55	$ 0.42
Diluted (in dollars per share)	$ 0.07	$ 0.14	$ 0.53	$ 0.39

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