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v3.19.1

Major Customers and Foreign Sales (Details) - Net Revenues | 6 Months Ended
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Mar. 31, 2019 | Mar. 31, 2018
Customer Concentration Risk | Customer One |  |
Revenue, Major Customer [Line Items] |  |
Concentration risk, percentage | 11.00% | 14.00%
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 | 40.00% | 21.00%
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 | 42.00% | 24.00%
Geographic Concentration Risk | China |  |
Revenue, Major Customer [Line Items] |  |
Concentration risk, percentage | 19.00% | 28.00%
Geographic Concentration Risk | Malaysia |  |
Revenue, Major Customer [Line Items] |  |
Concentration risk, percentage | 3.00% | 5.00%
Geographic Concentration Risk | Taiwan |  |
Revenue, Major Customer [Line Items] |  |
Concentration risk, percentage | 6.00% | 9.00%
Geographic Concentration Risk | Other Asia |  |
Revenue, Major Customer [Line Items] |  |
Concentration risk, percentage | 7.00% | 5.00%
Geographic Concentration Risk | Total Asia |  |
Revenue, Major Customer [Line Items] |  |
Concentration risk, percentage | 35.00% | 47.00%
Geographic Concentration Risk | Germany |  |
Revenue, Major Customer [Line Items] |  |
Concentration risk, percentage | 11.00% | 14.00%
Geographic Concentration Risk | Other Europe |  |
Revenue, Major Customer [Line Items] |  |
Concentration risk, percentage | 12.00% | 15.00%
Geographic Concentration Risk | Total Europe |  |
Revenue, Major Customer [Line Items] |  |
Concentration risk, percentage | 23.00% | 29.00%

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