Major Customers and Foreign Sales (Details) - Net Revenues	3 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Customer Concentration Risk | Customer One
Revenue, Major Customer [Line Items]
Concentration risk, percentage	13.00%	50.00%
Geographic Concentration Risk
Revenue, Major Customer [Line Items]
Concentration risk, percentage	100.00%	100.00%
Geographic Concentration Risk | United States
Revenue, Major Customer [Line Items]
Concentration risk, percentage	20.00%	7.00%
Geographic Concentration Risk | Other North America
Revenue, Major Customer [Line Items]
Concentration risk, percentage	2.00%	2.00%
Geographic Concentration Risk | Total North America
Revenue, Major Customer [Line Items]
Concentration risk, percentage	22.00%	9.00%
Geographic Concentration Risk | China
Revenue, Major Customer [Line Items]
Concentration risk, percentage	30.00%	71.00%
Geographic Concentration Risk | Malaysia
Revenue, Major Customer [Line Items]
Concentration risk, percentage	3.00%	3.00%
Geographic Concentration Risk | Taiwan
Revenue, Major Customer [Line Items]
Concentration risk, percentage	8.00%	2.00%
Geographic Concentration Risk | Other Asia
Revenue, Major Customer [Line Items]
Concentration risk, percentage	7.00%	3.00%
Geographic Concentration Risk | Total Asia
Revenue, Major Customer [Line Items]
Concentration risk, percentage	48.00%	79.00%
Geographic Concentration Risk | Germany
Revenue, Major Customer [Line Items]
Concentration risk, percentage	17.00%	6.00%
Geographic Concentration Risk | Other Europe
Revenue, Major Customer [Line Items]
Concentration risk, percentage	13.00%	6.00%
Geographic Concentration Risk | Total Europe
Revenue, Major Customer [Line Items]
Concentration risk, percentage	30.00%	12.00%