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	12 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2023
Earnings Per Share [Abstract]
Net income (loss) attributable to AOS	$ (96,976)	$ (11,081)	$ 12,364
Basic:
Weighted average number of common shares used to compute basic net income (loss) per share	29,405	28,236	27,552
Effect of potentially dilutive securities:
Stock options, RSUs and ESPP shares	0	0	1,976
Weighted average number of common shares used to compute diluted net income (loss) per share	29,405	28,236	29,528
Net income (loss) per share attributable to common shareholders:
Basic (in dollars per share)	$ (3.30)	$ (0.39)	$ 0.45
Diluted (in dollars per share)	$ (3.30)	$ (0.39)	$ 0.42