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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 6 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2024
Dec. 31, 2023
Numerator:        
Net income (loss) $ (6,614) $ (2,923) $ (9,110) $ 2,863
Basic:        
Weighted average number of common shares used to compute basic net income (loss) per share 29,163 27,939 29,083 27,816
Effect of potentially dilutive securities:        
Stock options, RSUs and ESPP shares 0 0 0 2,014
Weighted average number of common shares used to compute diluted net income (loss) per share 29,163 27,939 29,083 29,830
Net income (loss) per common share:        
Basic (in dollars per share) $ (0.23) $ (0.10) $ (0.31) $ 0.10
Diluted (in dollars per share) $ (0.23) $ (0.10) $ (0.31) $ 0.10