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Major Customers and Foreign Sales (Details) - Customer | 12 Months Ended
--- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2015
Revenue, Major Customer [Line Items] |  |  |
Revenue, number of major customers |  |  | 2
Revenues, percentage | 100.00% | 100.00% | 100.00%
Total Americas |  |  |
Revenue, Major Customer [Line Items] |  |  |
Revenues, percentage | 12.00% | 20.00% | 26.00%
United States |  |  |
Revenue, Major Customer [Line Items] |  |  |
Revenues, percentage |  |  | 24.00%
Other |  |  |
Revenue, Major Customer [Line Items] |  |  |
Revenues, percentage |  |  | 2.00%
Total Asia |  |  |
Revenue, Major Customer [Line Items] |  |  |
Revenues, percentage | 75.00% | 68.00% | 60.00%
Taiwan |  |  |
Revenue, Major Customer [Line Items] |  |  |
Revenues, percentage |  |  | 13.00%
Malaysia |  |  |
Revenue, Major Customer [Line Items] |  |  |
Revenues, percentage |  |  | 13.00%
China |  |  |
Revenue, Major Customer [Line Items] |  |  |
Revenues, percentage |  |  | 26.00%
Other |  |  |
Revenue, Major Customer [Line Items] |  |  |
Revenues, percentage |  |  | 8.00%
Total Europe |  |  |
Revenue, Major Customer [Line Items] |  |  |
Revenues, percentage | 13.00% | 12.00% | 14.00%
Germany |  |  |
Revenue, Major Customer [Line Items] |  |  |
Revenues, percentage |  |  | 5.00%
Other |  |  |
Revenue, Major Customer [Line Items] |  |  |
Revenues, percentage |  |  | 9.00%
Customer Number One |  |  |
Revenue, Major Customer [Line Items] |  |  |
Revenue, major customer, percentage |  | 11.00% | 15.00%
Customer Number Two |  |  |
Revenue, Major Customer [Line Items] |  |  |
Revenue, major customer, percentage |  |  | 11.00%
Sales Revenue, Net | Geographic Concentration Risk | United States |  |  |
Revenue, Major Customer [Line Items] |  |  |
Revenue, major customer, percentage | 11.00% | 17.00% |
Sales Revenue, Net | Geographic Concentration Risk | Other |  |  |
Revenue, Major Customer [Line Items] |  |  |
Revenue, major customer, percentage | 1.00% | 3.00% |
Sales Revenue, Net | Geographic Concentration Risk | Taiwan |  |  |
Revenue, Major Customer [Line Items] |  |  |
Revenue, major customer, percentage | 12.00% | 15.00% |
Sales Revenue, Net | Geographic Concentration Risk | Malaysia |  |  |
Revenue, Major Customer [Line Items] |  |  |
Revenue, major customer, percentage | 9.00% | 18.00% |
Sales Revenue, Net | Geographic Concentration Risk | China |  |  |
Revenue, Major Customer [Line Items] |  |  |
Revenue, major customer, percentage | 47.00% | 28.00% |
Sales Revenue, Net | Geographic Concentration Risk | Other |  |  |
Revenue, Major Customer [Line Items] |  |  |
Revenue, major customer, percentage | 7.00% | 7.00% |
Sales Revenue, Net | Geographic Concentration Risk | Germany |  |  |
Revenue, Major Customer [Line Items] |  |  |
Revenue, major customer, percentage | 5.00% | 3.00% |
Sales Revenue, Net | Geographic Concentration Risk | Other |  |  |
Revenue, Major Customer [Line Items] |  |  |
Revenue, major customer, percentage | 8.00% | 9.00% |

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