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Basis of Presentation and Significant Accounting Policies - Employee Retention Tax - Additional Information (Details) - USD ($) $ in Millions | 3 Months Ended
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Mar. 31, 2026 | Jun. 30, 2025
Income Taxes [Line Items] |  |
Employee retention credit, amount received | $ 0.2 | $ 2.1
Location, Statement of Income, Balance [Axis]: asys:ResearchDevelopmentAndEngineeringNet |  |
Income Taxes [Line Items] |  |
Employee retention credit, amount received |  | 0.3
Location, Statement of Income, Balance [Axis]: us-gaap:CostOfGoodsAndServicesSold |  |
Income Taxes [Line Items] |  |
Employee retention credit, amount received |  | 1.0
Location, Statement of Income, Balance [Axis]: us-gaap:SellingGeneralAndAdministrativeExpense |  |
Income Taxes [Line Items] |  |
Employee retention credit, amount received |  | $ 0.8

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- Definition Employee retention credit, amount received. + References No definition available. + Details
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Namespace Prefix: | asys_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Income taxes. + References No definition available. + Details
Name: | asys_IncomeTaxesLineItems
Namespace Prefix: | asys_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_StatementOfIncomeLocationBalanceAxis=asys_ResearchDevelopmentAndEngineeringNet
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementOfIncomeLocationBalanceAxis=us-gaap_CostOfGoodsAndServicesSold
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementOfIncomeLocationBalanceAxis=us-gaap_SellingGeneralAndAdministrativeExpense
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |