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Commitments and Contingencies (Details) (USD $) In Millions, unless otherwise specified | Jun. 30, 2012 | Sep. 30, 2011
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Commitments and Contingencies [Abstract] |  |
Purchase obligation | $ 17.0 | $ 47.2

X
- Details
Name: | asys_CommitmentsAndContingenciesAbstract
Namespace Prefix: | asys_
Data Type: | xbrli:stringItemType
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