The Company and Significant Accounting Policies - Government Grants (Details) - USD ($) $ in Millions	3 Months Ended
Sep. 30, 2020	Sep. 30, 2019
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Government Grants, Reduction Recorded To Interest Expense	$ 0.8	$ 2.3
Government Grants, Reduction Recorded To Operating Expenses	$ 1.9

Government Grants, Reduction Recorded To Operating Expenses

No definition available.

Name:	aosl_GovernmentGrantsReductionRecordedToOperatingExpenses
Namespace Prefix:	aosl_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration