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Major Customers and Foreign Sales (Details) - Net Revenues | 6 Months Ended
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Mar. 31, 2017 | Mar. 31, 2016
Customer Concentration Risk | Customer Number One |  |
Revenue, Major Customer [Line Items] |  |
Concentration risk, percentage | 19.00% |
Geographic Concentration Risk |  |
Revenue, Major Customer [Line Items] |  |
Concentration risk, percentage | 100.00% | 100.00%
Geographic Concentration Risk | United States |  |
Revenue, Major Customer [Line Items] |  |
Concentration risk, percentage | 16.00% | 23.00%
Geographic Concentration Risk | Other North America |  |
Revenue, Major Customer [Line Items] |  |
Concentration risk, percentage | 2.00% | 3.00%
Geographic Concentration Risk | Total North America |  |
Revenue, Major Customer [Line Items] |  |
Concentration risk, percentage | 18.00% | 26.00%
Geographic Concentration Risk | China |  |
Revenue, Major Customer [Line Items] |  |
Concentration risk, percentage | 29.00% | 22.00%
Geographic Concentration Risk | Malaysia |  |
Revenue, Major Customer [Line Items] |  |
Concentration risk, percentage | 18.00% | 15.00%
Geographic Concentration Risk | Taiwan |  |
Revenue, Major Customer [Line Items] |  |
Concentration risk, percentage | 13.00% | 12.00%
Geographic Concentration Risk | Other Asia |  |
Revenue, Major Customer [Line Items] |  |
Concentration risk, percentage | 8.00% | 7.00%
Geographic Concentration Risk | Total Asia |  |
Revenue, Major Customer [Line Items] |  |
Concentration risk, percentage | 68.00% | 56.00%
Geographic Concentration Risk | Germany |  |
Revenue, Major Customer [Line Items] |  |
Concentration risk, percentage | 5.00% | 3.00%
Geographic Concentration Risk | Other Europe |  |
Revenue, Major Customer [Line Items] |  |
Concentration risk, percentage | 9.00% | 15.00%
Geographic Concentration Risk | Total Europe |  |
Revenue, Major Customer [Line Items] |  |
Concentration risk, percentage | 14.00% | 18.00%

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