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v3.20.2

Commitments and Contingencies - Additional Information (Details) $ in Millions | 12 Months Ended
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Sep. 30, 2020 USD ($)
Commitments and Contingencies [Line Items] |
Purchase obligation | $ 4.6
Minimum |
Commitments and Contingencies [Line Items] |
Severance payment term | 12 months
Maximum |
Commitments and Contingencies [Line Items] |
Severance payment term | 36 months

X
- Definition Commitments and contingencies. + References No definition available. + Details
Name: | asys_CommitmentsAndContingenciesLineItems
Namespace Prefix: | asys_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Employment Contract, Severance Payment Term + References No definition available. + Details
Name: | asys_EmploymentContractSeverancePaymentTerm
Namespace Prefix: | asys_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Minimum amount of purchase arrangement in which the entity has agreed to expend funds to procure goods or services from a supplier. + References No definition available. + Details
Name: | us-gaap_PurchaseObligation
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Details
Name: | srt_RangeAxis=srt_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |