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Summary of Significant Accounting Policies (Inventories) (Details) | 12 Months Ended |
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017
Inventory [Line Items] |  |
Percentage of weighted average cost inventory | 34.00% | 55.00%
Minimum |  |
Inventory [Line Items] |  |
Purchase order commitment period | 30 days |
Maximum |  |
Inventory [Line Items] |  |
Purchase order commitment period | 180 days |

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- Definition Purchase Order Commitment Period + References No definition available. + Details
Name: | asys_PurchaseOrderCommitmentPeriod
Namespace Prefix: | asys_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_InventoryLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition The percentage of weighted average cost inventory present at the reporting date when inventory is valued using different valuation methods. + References No definition available. + Details
Name: | us-gaap_PercentageOfWeightedAverageCostInventory
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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- 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: |