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Major Customers and Foreign Sales (Details) - Net revenues | 12 Months Ended
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Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2016
Revenue, Major Customer [Line Items] |  |  |
Revenue, major customer, percentage | 100.00% | 100.00% | 100.00%
Total Americas |  |  |
Revenue, Major Customer [Line Items] |  |  |
Revenue, major customer, percentage | 14.00% | 12.00% | 20.00%
Total Asia |  |  |
Revenue, Major Customer [Line Items] |  |  |
Revenue, major customer, percentage | 70.00% | 75.00% | 68.00%
Total Europe |  |  |
Revenue, Major Customer [Line Items] |  |  |
Revenue, major customer, percentage | 16.00% | 13.00% | 12.00%
Customer Number One |  |  |
Revenue, Major Customer [Line Items] |  |  |
Revenue, major customer, percentage | 25.00% | 25.00% | 11.00%
Geographic Concentration Risk | United States |  |  |
Revenue, Major Customer [Line Items] |  |  |
Revenue, major customer, percentage | 12.00% | 11.00% | 17.00%
Geographic Concentration Risk | Other |  |  |
Revenue, Major Customer [Line Items] |  |  |
Revenue, major customer, percentage | 2.00% | 1.00% | 3.00%
Geographic Concentration Risk | Taiwan |  |  |
Revenue, Major Customer [Line Items] |  |  |
Revenue, major customer, percentage | 7.00% | 12.00% | 15.00%
Geographic Concentration Risk | Malaysia |  |  |
Revenue, Major Customer [Line Items] |  |  |
Revenue, major customer, percentage | 6.00% | 9.00% | 18.00%
Geographic Concentration Risk | China |  |  |
Revenue, Major Customer [Line Items] |  |  |
Revenue, major customer, percentage | 53.00% | 47.00% | 28.00%
Geographic Concentration Risk | Other |  |  |
Revenue, Major Customer [Line Items] |  |  |
Revenue, major customer, percentage | 4.00% | 7.00% | 7.00%
Geographic Concentration Risk | Germany |  |  |
Revenue, Major Customer [Line Items] |  |  |
Revenue, major customer, percentage | 7.00% | 5.00% | 3.00%
Geographic Concentration Risk | Other |  |  |
Revenue, Major Customer [Line Items] |  |  |
Revenue, major customer, percentage | 9.00% | 8.00% | 9.00%

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