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Commitments and Contingencies - Additional Information (Details) - USD ($) $ in Millions | 6 Months Ended |
--- | --- | ---
Mar. 31, 2020 | Sep. 30, 2019
Commitments and Contingencies [Line Items] |  |
Purchase obligation | $ 8.8 | $ 4.4
Minimum |  |
Commitments and Contingencies [Line Items] |  |
Severance payment term | 12 months |
Maximum |  |
Commitments and Contingencies [Line Items] |  |
Severance payment term | 36 months |

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- 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

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- 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

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- 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: |

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