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Major Customers and Sales by Country - Schedule of Revenues by Geographic Region (Details) - Net Revenues - Geographic Concentration Risk | 12 Months Ended
--- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2018
Revenue, Major Customer [Line Items] |  |  |
Concentration risk, percentage | 100.00% | 100.00% | 100.00%
United States |  |  |
Revenue, Major Customer [Line Items] |  |  |
Concentration risk, percentage | 28.00% | 35.00% | 21.00%
Other Americas |  |  |
Revenue, Major Customer [Line Items] |  |  |
Concentration risk, percentage | 7.00% | 6.00% | 3.00%
Total Americas |  |  |
Revenue, Major Customer [Line Items] |  |  |
Concentration risk, percentage | 35.00% | 41.00% | 24.00%
China |  |  |
Revenue, Major Customer [Line Items] |  |  |
Concentration risk, percentage | 25.00% | 18.00% | 30.00%
Malaysia |  |  |
Revenue, Major Customer [Line Items] |  |  |
Concentration risk, percentage | 5.00% | 5.00% | 8.00%
Taiwan |  |  |
Revenue, Major Customer [Line Items] |  |  |
Concentration risk, percentage | 15.00% | 10.00% | 9.00%
Other Asia |  |  |
Revenue, Major Customer [Line Items] |  |  |
Concentration risk, percentage | 7.00% | 8.00% | 5.00%
Total Asia |  |  |
Revenue, Major Customer [Line Items] |  |  |
Concentration risk, percentage | 52.00% | 41.00% | 52.00%
Germany |  |  |
Revenue, Major Customer [Line Items] |  |  |
Concentration risk, percentage | 3.00% | 8.00% | 10.00%
Other Europe |  |  |
Revenue, Major Customer [Line Items] |  |  |
Concentration risk, percentage | 10.00% | 10.00% | 14.00%
Total Europe |  |  |
Revenue, Major Customer [Line Items] |  |  |
Concentration risk, percentage | 13.00% | 18.00% | 24.00%

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