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Major Customers and Foreign Sales - Schedule of Revenues by Geographic Region (Details) - Net Revenues - Geographic Concentration Risk | 6 Months Ended
--- | ---
Mar. 31, 2021 | Mar. 31, 2020
Revenue, Major Customer [Line Items] |  |
Concentration risk, percentage | 100.00% | 100.00%
United States |  |
Revenue, Major Customer [Line Items] |  |
Concentration risk, percentage | 24.00% | 34.00%
Other North America |  |
Revenue, Major Customer [Line Items] |  |
Concentration risk, percentage | 3.00% | 6.00%
Total North America |  |
Revenue, Major Customer [Line Items] |  |
Concentration risk, percentage | 27.00% | 40.00%
China |  |
Revenue, Major Customer [Line Items] |  |
Concentration risk, percentage | 28.00% | 24.00%
Malaysia |  |
Revenue, Major Customer [Line Items] |  |
Concentration risk, percentage | 5.00% | 4.00%
Taiwan |  |
Revenue, Major Customer [Line Items] |  |
Concentration risk, percentage | 20.00% | 11.00%
Other Asia |  |
Revenue, Major Customer [Line Items] |  |
Concentration risk, percentage | 8.00% | 7.00%
Total Asia |  |
Revenue, Major Customer [Line Items] |  |
Concentration risk, percentage | 61.00% | 46.00%
Germany |  |
Revenue, Major Customer [Line Items] |  |
Concentration risk, percentage | 3.00% | 3.00%
Other Europe |  |
Revenue, Major Customer [Line Items] |  |
Concentration risk, percentage | 9.00% | 11.00%
Total Europe |  |
Revenue, Major Customer [Line Items] |  |
Concentration risk, percentage | 12.00% | 14.00%

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