Major Customers and Foreign Sales (Details) - Net Revenues	3 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Customer Concentration Risk | Customer Number One
Revenue, Major Customer [Line Items]
Concentration risk, percentage	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	7.00%	18.00%
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	9.00%	20.00%
Geographic Concentration Risk | China
Revenue, Major Customer [Line Items]
Concentration risk, percentage	71.00%	26.00%
Geographic Concentration Risk | Malaysia
Revenue, Major Customer [Line Items]
Concentration risk, percentage	3.00%	17.00%
Geographic Concentration Risk | Taiwan
Revenue, Major Customer [Line Items]
Concentration risk, percentage	2.00%	12.00%
Geographic Concentration Risk | Other Asia
Revenue, Major Customer [Line Items]
Concentration risk, percentage	3.00%	6.00%
Geographic Concentration Risk | Total Asia
Revenue, Major Customer [Line Items]
Concentration risk, percentage	79.00%	61.00%
Geographic Concentration Risk | Germany
Revenue, Major Customer [Line Items]
Concentration risk, percentage	6.00%	5.00%
Geographic Concentration Risk | Other Europe
Revenue, Major Customer [Line Items]
Concentration risk, percentage	6.00%	14.00%
Geographic Concentration Risk | Total Europe
Revenue, Major Customer [Line Items]
Concentration risk, percentage	12.00%	19.00%