Major Customers and Foreign Sales (Details) - Net Revenues	6 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Customer Concentration Risk | Customer Number One
Revenue, Major Customer [Line Items]
Concentration risk, percentage	19.00%
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	16.00%	23.00%
Geographic Concentration Risk | Other North America
Revenue, Major Customer [Line Items]
Concentration risk, percentage	2.00%	3.00%
Geographic Concentration Risk | Total North America
Revenue, Major Customer [Line Items]
Concentration risk, percentage	18.00%	26.00%
Geographic Concentration Risk | China
Revenue, Major Customer [Line Items]
Concentration risk, percentage	29.00%	22.00%
Geographic Concentration Risk | Malaysia
Revenue, Major Customer [Line Items]
Concentration risk, percentage	18.00%	15.00%
Geographic Concentration Risk | Taiwan
Revenue, Major Customer [Line Items]
Concentration risk, percentage	13.00%	12.00%
Geographic Concentration Risk | Other Asia
Revenue, Major Customer [Line Items]
Concentration risk, percentage	8.00%	7.00%
Geographic Concentration Risk | Total Asia
Revenue, Major Customer [Line Items]
Concentration risk, percentage	68.00%	56.00%
Geographic Concentration Risk | Germany
Revenue, Major Customer [Line Items]
Concentration risk, percentage	5.00%	3.00%
Geographic Concentration Risk | Other Europe
Revenue, Major Customer [Line Items]
Concentration risk, percentage	9.00%	15.00%
Geographic Concentration Risk | Total Europe
Revenue, Major Customer [Line Items]
Concentration risk, percentage	14.00%	18.00%