Major Customers and Foreign Sales - Schedule of Revenues by Geographic Region (Details) - Net Revenues - Geographic Concentration Risk	9 Months Ended
	Jun. 30, 2022	Jun. 30, 2021
Revenue, Major Customer [Line Items]
Concentration risk, percentage	100.00%	100.00%
United States
Revenue, Major Customer [Line Items]
Concentration risk, percentage	24.00%	22.00%
Other North America
Revenue, Major Customer [Line Items]
Concentration risk, percentage	7.00%	3.00%
Total North America
Revenue, Major Customer [Line Items]
Concentration risk, percentage	31.00%	25.00%
China
Revenue, Major Customer [Line Items]
Concentration risk, percentage	19.00%	33.00%
Malaysia
Revenue, Major Customer [Line Items]
Concentration risk, percentage	8.00%	4.00%
Taiwan
Revenue, Major Customer [Line Items]
Concentration risk, percentage	13.00%	17.00%
Other Asia
Revenue, Major Customer [Line Items]
Concentration risk, percentage	6.00%	9.00%
Total Asia
Revenue, Major Customer [Line Items]
Concentration risk, percentage	46.00%	63.00%
Germany
Revenue, Major Customer [Line Items]
Concentration risk, percentage	5.00%	4.00%
Austria
Revenue, Major Customer [Line Items]
Concentration risk, percentage	11.00%	1.00%
Other Europe
Revenue, Major Customer [Line Items]
Concentration risk, percentage	7.00%	7.00%
Total Europe
Revenue, Major Customer [Line Items]
Concentration risk, percentage	23.00%	12.00%