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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, 2025
Mar. 31, 2024
Mar. 31, 2025
Mar. 31, 2024
Numerator:        
Net loss $ (10,807)   $ (19,917)  
Basic:        
Weighted average number of common shares used to compute basic net loss per share 29,530 28,433 29,232 28,022
Effect of potentially dilutive securities:        
Weighted average number of common shares used to compute diluted net loss per share 29,530 28,433 29,232 28,022
Net loss per common share:        
Basic (in dollars per share) $ (0.37) $ (0.39) $ (0.68) $ (0.30)
Diluted (in dollars per share) $ (0.37) $ (0.39) $ (0.68) $ (0.30)