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Major Customers and Foreign Sales (Details) - Net Revenues | 9 Months Ended
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Jun. 30, 2019 | Jun. 30, 2018
Customer Concentration Risk | Customer One |  |
Revenue, Major Customer [Line Items] |  |
Concentration risk, percentage | 11.00% | 16.00%
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 | 36.00% | 21.00%
Geographic Concentration Risk | Other North America |  |
Revenue, Major Customer [Line Items] |  |
Concentration risk, percentage | 5.00% | 3.00%
Geographic Concentration Risk | Total North America |  |
Revenue, Major Customer [Line Items] |  |
Concentration risk, percentage | 41.00% | 24.00%
Geographic Concentration Risk | China |  |
Revenue, Major Customer [Line Items] |  |
Concentration risk, percentage | 18.00% | 28.00%
Geographic Concentration Risk | Malaysia |  |
Revenue, Major Customer [Line Items] |  |
Concentration risk, percentage | 5.00% | 7.00%
Geographic Concentration Risk | Taiwan |  |
Revenue, Major Customer [Line Items] |  |
Concentration risk, percentage | 10.00% | 9.00%
Geographic Concentration Risk | Other Asia |  |
Revenue, Major Customer [Line Items] |  |
Concentration risk, percentage | 6.00% | 4.00%
Geographic Concentration Risk | Total Asia |  |
Revenue, Major Customer [Line Items] |  |
Concentration risk, percentage | 39.00% | 48.00%
Geographic Concentration Risk | Germany |  |
Revenue, Major Customer [Line Items] |  |
Concentration risk, percentage | 9.00% | 12.00%
Geographic Concentration Risk | Other Europe |  |
Revenue, Major Customer [Line Items] |  |
Concentration risk, percentage | 11.00% | 16.00%
Geographic Concentration Risk | Total Europe |  |
Revenue, Major Customer [Line Items] |  |
Concentration risk, percentage | 20.00% | 28.00%

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