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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, 2022 | Mar. 31, 2021
Revenue, Major Customer [Line Items] |  |
Concentration risk, percentage | 100.00% | 100.00%
United States |  |
Revenue, Major Customer [Line Items] |  |
Concentration risk, percentage | 21.00% | 24.00%
Other North America |  |
Revenue, Major Customer [Line Items] |  |
Concentration risk, percentage | 9.00% | 3.00%
Total North America |  |
Revenue, Major Customer [Line Items] |  |
Concentration risk, percentage | 30.00% | 27.00%
China |  |
Revenue, Major Customer [Line Items] |  |
Concentration risk, percentage | 20.00% | 28.00%
Malaysia |  |
Revenue, Major Customer [Line Items] |  |
Concentration risk, percentage | 9.00% | 5.00%
Taiwan |  |
Revenue, Major Customer [Line Items] |  |
Concentration risk, percentage | 14.00% | 20.00%
Other Asia |  |
Revenue, Major Customer [Line Items] |  |
Concentration risk, percentage | 5.00% | 8.00%
Total Asia |  |
Revenue, Major Customer [Line Items] |  |
Concentration risk, percentage | 48.00% | 61.00%
Germany |  |
Revenue, Major Customer [Line Items] |  |
Concentration risk, percentage | 6.00% | 3.00%
Austria |  |
Revenue, Major Customer [Line Items] |  |
Concentration risk, percentage | 9.00% | 1.00%
Other Europe |  |
Revenue, Major Customer [Line Items] |  |
Concentration risk, percentage | 7.00% | 8.00%
Total Europe |  |
Revenue, Major Customer [Line Items] |  |
Concentration risk, percentage | 22.00% | 12.00%

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