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v3.20.2

Summary of Operations and Significant Accounting Policies - Inventories - Additional Information (Details) | 12 Months Ended |
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019
Minimum |  |
Inventory [Line Items] |  |
Percentage of FIFO basis inventory | 90.00% | 90.00%
Purchase order commitment period | 30 days |
Maximum |  |
Inventory [Line Items] |  |
Purchase order commitment period, description | 180 days or longer |

X
- 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

X
- Definition Purchase order commitment period, description. + References No definition available. + Details
Name: | asys_PurchaseOrderCommitmentPeriodDescription
Namespace Prefix: | asys_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- 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

X
- Definition The percentage of FIFO (first in first out) inventory to total inventory as of the balance sheet date if other than 100 percent. + References No definition available. + Details
Name: | us-gaap_PercentageOfFIFOInventory
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: |

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