Income Taxes - Schedule of Components of Income (Loss) Before Provision for Income Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2019
Income Tax Disclosure [Abstract]
Domestic	$ (3,320)	$ (18,652)	$ 916
Foreign	6,754	3,673	(4,648)
Income (loss) before provision for income taxes	$ 3,434	$ (14,979)	$ (3,732)

Income (loss) from continuing and discontinued operations before income taxes minority interest and income loss from equity method investments.

No definition available.

Name:	asys_IncomeLossFromContinuingAndDiscontinuedOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration