Goodwill and Intangible Assets (Narrative) (Details) - USD ($)	6 Months Ended	12 Months Ended
	Mar. 31, 2015	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2013
Finite Lived Intangible Assets [Line Items]
Impairment of goodwill		$ 0	$ 0
Amortization of intangible assets		435,000	779,000	$ 1,659,000
Cash received from amended supply agreement	$ 2,300,000	2,333,000	10,000,000
Other current assets		3,916,000	4,291,000
Long term receivable		$ 2,333,000	4,667,000
Deferred credit amortization period		4 years
Gain in other income		$ 2,402,000	$ 1,522,000
General Electric Company
Finite Lived Intangible Assets [Line Items]
Additional amount paid on execution of agreement		$ 7,000,000
Acquired finite-lived intangible assets, period		3 years
Other current assets		$ 2,300,000
Deferred credit					$ 8,100,000
Purchased Technology | Minimum
Finite Lived Intangible Assets [Line Items]
Useful life of intangible asset		6 years
Purchased Technology | Maximum
Finite Lived Intangible Assets [Line Items]
Useful life of intangible asset		7 years
Trade Names
Finite Lived Intangible Assets [Line Items]
Useful life of intangible asset		10 years
Supply Agreement
Finite Lived Intangible Assets [Line Items]
Useful life of intangible asset		15 years