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Major Customers and Foreign Sales - Schedule of Revenues by Geographic Region (Details) - Net Revenues - Geographic Concentration Risk | 3 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
Revenue, Major Customer [Line Items] |  |
Concentration risk, percentage | 100.00% | 100.00%
United States |  |
Revenue, Major Customer [Line Items] |  |
Concentration risk, percentage | 19.00% | 33.00%
Other North America |  |
Revenue, Major Customer [Line Items] |  |
Concentration risk, percentage | 1.00% | 9.00%
Total North America |  |
Revenue, Major Customer [Line Items] |  |
Concentration risk, percentage | 20.00% | 42.00%
China |  |
Revenue, Major Customer [Line Items] |  |
Concentration risk, percentage | 24.00% | 23.00%
Malaysia |  |
Revenue, Major Customer [Line Items] |  |
Concentration risk, percentage | 3.00% | 2.00%
Taiwan |  |
Revenue, Major Customer [Line Items] |  |
Concentration risk, percentage | 32.00% | 13.00%
Other Asia |  |
Revenue, Major Customer [Line Items] |  |
Concentration risk, percentage | 9.00% | 6.00%
Total Asia |  |
Revenue, Major Customer [Line Items] |  |
Concentration risk, percentage | 68.00% | 44.00%
Germany |  |
Revenue, Major Customer [Line Items] |  |
Concentration risk, percentage | 2.00% | 3.00%
Other Europe |  |
Revenue, Major Customer [Line Items] |  |
Concentration risk, percentage | 10.00% | 11.00%
Total Europe |  |
Revenue, Major Customer [Line Items] |  |
Concentration risk, percentage | 12.00% | 14.00%

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