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Net Income 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
 3 Months Ended 9 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Mar. 31, 2022
Mar. 31, 2021
Numerator:        
Net income attributable to Alpha and Omega Semiconductor Limited $ 31,650 $ 16,100 $ 438,072 $ 38,577
Basic:        
Weighted average number of common shares used to compute basic net income per share 26,829 25,882 26,596 25,631
Effect of potentially dilutive securities:        
Stock options, RSUs and ESPP shares 1,594 1,834 1,520 1,497
Weighted average number of common shares used to compute diluted net income per share 28,423 27,716 28,116 27,128
Net income per share attributable to Alpha and Omega Semiconductor Limited:        
Basic (in dollars per share) $ 1.18 $ 0.62 $ 16.47 $ 1.51
Diluted (in dollars per share) $ 1.11 $ 0.58 $ 15.58 $ 1.42