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v2.4.0.6

Major Customers and Foreign Sales (Details) | 12 Months Ended
--- | ---
Sep. 30, 2012 Customer | Sep. 30, 2011 Customer | Sep. 30, 2010 Customer
Revenue, Major Customer [Line Items] |  |  |
Revenue, number of major customers | 1 | 2 | 1
Revenues, percentage | 100.00% | 100.00% | 100.00%
United States [Member] |  |  |
Revenue, Major Customer [Line Items] |  |  |
Revenues, percentage | 13.00% | 6.00% | 7.00%
Taiwan [Member] |  |  |
Revenue, Major Customer [Line Items] |  |  |
Revenues, percentage | 9.00% | 16.00% | 17.00%
China [Member] |  |  |
Revenue, Major Customer [Line Items] |  |  |
Revenues, percentage | 43.00% | 69.00% | 64.00%
Other Asia [Member] |  |  |
Revenue, Major Customer [Line Items] |  |  |
Revenues, percentage | 14.00% | 3.00% | 3.00%
Asia [Member] |  |  |
Revenue, Major Customer [Line Items] |  |  |
Revenues, percentage | 66.00% | 88.00% | 84.00%
Germany [Member] |  |  |
Revenue, Major Customer [Line Items] |  |  |
Revenues, percentage | 8.00% | 3.00% | 3.00%
Other Europe [Member] |  |  |
Revenue, Major Customer [Line Items] |  |  |
Revenues, percentage | 13.00% | 3.00% | 6.00%
Europe [Member] |  |  |
Revenue, Major Customer [Line Items] |  |  |
Revenues, percentage | 21.00% | 6.00% | 9.00%
Customer Number One [Member] |  |  |
Revenue, Major Customer [Line Items] |  |  |
Revenue, major customer, percentage | 11.00% |  |
Customer Number Two [Member] |  |  |
Revenue, Major Customer [Line Items] |  |  |
Revenue, major customer, percentage |  | 14.00% |
Yingli [Member] |  |  |
Revenue, Major Customer [Line Items] |  |  |
Revenue, major customer, percentage | 7.00% | 15.00% | 28.00%

X
- Definition Entity-Wide Revenue, Major Customer, Number + References No definition available. + Details
Name: | asys_EntityWideRevenueMajorCustomerNumber
Namespace Prefix: | asys_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Revenues, Percentage + References No definition available. + Details
Name: | asys_RevenuesPercentage
Namespace Prefix: | asys_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_EntityWideRevenueMajorCustomerLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Percentage of revenue generated from a single external customer that accounts for 10 percent or more of an entity's revenues. + References No definition available. + Details
Name: | us-gaap_EntityWideRevenueMajorCustomerPercentage
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration