Major Customers and Foreign Sales - Schedule of Revenues by Geographic Region (Details) - Net Revenues - Geographic Concentration Risk	6 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Revenue, Major Customer [Line Items]
Concentration risk, percentage	100.00%	100.00%
United States
Revenue, Major Customer [Line Items]
Concentration risk, percentage	34.00%	40.00%
Other North America
Revenue, Major Customer [Line Items]
Concentration risk, percentage	6.00%	2.00%
Total North America
Revenue, Major Customer [Line Items]
Concentration risk, percentage	40.00%	42.00%
China
Revenue, Major Customer [Line Items]
Concentration risk, percentage	24.00%	19.00%
Malaysia
Revenue, Major Customer [Line Items]
Concentration risk, percentage	4.00%	3.00%
Taiwan
Revenue, Major Customer [Line Items]
Concentration risk, percentage	11.00%	6.00%
Other Asia
Revenue, Major Customer [Line Items]
Concentration risk, percentage	7.00%	7.00%
Total Asia
Revenue, Major Customer [Line Items]
Concentration risk, percentage	46.00%	35.00%
Germany
Revenue, Major Customer [Line Items]
Concentration risk, percentage	3.00%	11.00%
Other Europe
Revenue, Major Customer [Line Items]
Concentration risk, percentage	11.00%	12.00%
Total Europe
Revenue, Major Customer [Line Items]
Concentration risk, percentage	14.00%	23.00%