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Net Income (Loss) Per Common Share Attributable to Alpha and Omega Semiconductor Limited - Basic and Diluted Income Per Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 12 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2020
Earnings Per Share [Abstract]      
Net income (loss) attributable to AOS $ 453,163 $ 58,116 $ (6,596)
Basic:      
Weighted average number of common shares used to compute basic net income (loss) per share 26,764 25,786 24,840
Effect of potentially dilutive securities:      
Stock options, RSUs and ESPP shares 1,439 1,486 0
Weighted average number of common shares used to compute diluted net income (loss) per share 28,203 27,272 24,840
Net income (loss) per share attributable to common shareholders:      
Basic (in dollars per share) $ 16.93 $ 2.25 $ (0.27)
Diluted (in dollars per share) $ 16.07 $ 2.13 $ (0.27)