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, 2026	Mar. 31, 2025	Mar. 31, 2026	Mar. 31, 2025
Numerator:
Net loss	$ (13,787)		$ (29,202)
Basic:
Weighted average number of common shares used to compute basic net loss per share	29,807	29,530	29,887	29,232
Effect of potentially dilutive securities:
Weighted average number of common shares used to compute diluted net loss per share	29,807	29,530	29,887	29,232
Net loss per common share:
Basic (in dollars per share)	$ (0.46)	$ (0.37)	$ (0.98)	$ (0.68)
Diluted (in dollars per share)	$ (0.46)	$ (0.37)	$ (0.98)	$ (0.68)