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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
 3 Months Ended 9 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Mar. 31, 2024
Mar. 31, 2023
Numerator:        
Net income (loss) $ (11,212) $ (18,907) $ (8,349) $ 13,468
Basic:        
Weighted average number of common shares used to compute basic net income (loss) per share 28,433 27,710 28,022 27,537
Effect of potentially dilutive securities:        
Stock options, RSUs and ESPP shares 0 0 0 2,039
Weighted average number of common shares used to compute diluted net income (loss) per share 28,433 27,710 28,022 29,576
Net income (loss) per share:        
Basic (in dollars per share) $ (0.39) $ (0.68) $ (0.30) $ 0.49
Diluted (in dollars per share) $ (0.39) $ (0.68) $ (0.30) $ 0.46