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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
Sep. 30, 2025
Sep. 30, 2024
Numerator:    
Net loss $ (2,122)  
Basic:    
Weighted average number of common shares used to compute basic net loss per share 30,036 29,004
Effect of potentially dilutive securities:    
Weighted average number of common shares used to compute diluted net loss per share 30,036 29,004
Net loss per common share:    
Basic (in dollars per share) $ (0.07) $ (0.09)
Diluted (in dollars per share) $ (0.07) $ (0.09)