Cover - USD ($) $ in Millions	12 Months Ended
	Jun. 30, 2025	Jul. 31, 2025	Dec. 31, 2024
Cover [Abstract]
Document Type	10-K
Document Annual Report	true
Document Period End Date	Jun. 30, 2025
Current Fiscal Year End Date	--06-30
Document Transition Report	false
Entity File Number	001-34717
Entity Registrant Name	Alpha and Omega Semiconductor Limited
Entity Incorporation, State or Country Code	D0
Entity Tax Identification Number	77-0553536
Entity Address, Address Line One	Clarendon House
Entity Address, Address Line Two	2 Church Street
Entity Address, City or Town	Hamilton
Entity Address, Postal Zip Code	HM 11
Entity Address, Country	BM
City Area Code	408
Local Phone Number	830-9742
Title of 12(b) Security	Common Shares, $0.002 par value per share
Trading Symbol	AOSL
Security Exchange Name	NASDAQ
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Document Financial Statement Error Correction [Flag]	false
Entity Shell Company	false
Entity Public Float			$ 904
Entity Common Stock, Shares Outstanding (in shares)		30,013,611
Entity Central Index Key	0001387467
Document Fiscal Year Focus	2025
Document Fiscal Period Focus	FY
Amendment Flag	false
ICFR Auditor Attestation Flag	false