Major Customers and Foreign Sales (Details) - Net Revenues	9 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Customer Concentration Risk | Customer One
Revenue, Major Customer [Line Items]
Concentration risk, percentage	29.00%	18.00%
Customer Concentration Risk | Customer Two
Revenue, Major Customer [Line Items]
Concentration risk, percentage		11.00%
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	12.00%	13.00%
Geographic Concentration Risk | Other North America
Revenue, Major Customer [Line Items]
Concentration risk, percentage	1.00%	1.00%
Geographic Concentration Risk | Total North America
Revenue, Major Customer [Line Items]
Concentration risk, percentage	13.00%	14.00%
Geographic Concentration Risk | China
Revenue, Major Customer [Line Items]
Concentration risk, percentage	54.00%	43.00%
Geographic Concentration Risk | Malaysia
Revenue, Major Customer [Line Items]
Concentration risk, percentage	5.00%	11.00%
Geographic Concentration Risk | Taiwan
Revenue, Major Customer [Line Items]
Concentration risk, percentage	6.00%	10.00%
Geographic Concentration Risk | Other Asia
Revenue, Major Customer [Line Items]
Concentration risk, percentage	5.00%	8.00%
Geographic Concentration Risk | Total Asia
Revenue, Major Customer [Line Items]
Concentration risk, percentage	70.00%	72.00%
Geographic Concentration Risk | Germany
Revenue, Major Customer [Line Items]
Concentration risk, percentage	8.00%	5.00%
Geographic Concentration Risk | Other Europe
Revenue, Major Customer [Line Items]
Concentration risk, percentage	9.00%	9.00%
Geographic Concentration Risk | Total Europe
Revenue, Major Customer [Line Items]
Concentration risk, percentage	17.00%	14.00%