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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
	Sep. 30, 2018	Sep. 30, 2017
Numerator:
Net income attributable to Alpha and Omega Semiconductor Limited	$ 2,416	$ 4,800
Basic:
Weighted average number of common shares used to compute basic net income per share	23,844	24,021
Effect of potentially dilutive securities:
Stock options, RSUs and ESPP shares	750	939
Weighted average number of common shares used to compute diluted net income per share	24,594	24,960
Net income per share attributable to Alpha and Omega Semiconductor Limited:
Basic (in dollars per share)	$ 0.10	$ 0.20
Diluted (in dollars per share)	$ 0.10	$ 0.19

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