Intangible Assets (Narrative) (Details) (USD $)	12 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2012
Finite Lived Intangible Assets [Line Items]
Impairment of goodwill	$ 0	$ 0
Amortization of intangible assets	779,000	1,659,000	2,599,000
Cash received from amended supply agreement	10,000,000
Other current assets	4,291,000	658,000
Long term receivable	4,667,000
Deferred credit amortization period	4 years
Gain on amended supply agreement	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