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Goodwill and Other Intangible Assets, Net - Overview (Details) - USD ($) $ in Thousands		3 Months Ended	6 Months Ended
	Jan. 07, 2015	Mar. 31, 2016	Mar. 31, 2016	Sep. 30, 2015
Goodwill and Other Intangible Assets, Net
Goodwill impairment charges		$ 0
Goodwill		$ 4,789	$ 4,789	$ 4,789
Leveltek Processing, LLC
Goodwill and Other Intangible Assets, Net
Acquisition price	$ 14,600
Goodwill	4,789
Customer relationships	2,100
Patents \| Minimum
Goodwill and Other Intangible Assets, Net
Useful life			2 years
Patents \| Maximum
Goodwill and Other Intangible Assets, Net
Useful life			16 years
Customer relationships \| Minimum
Goodwill and Other Intangible Assets, Net
Useful life			2 years
Customer relationships \| Maximum
Goodwill and Other Intangible Assets, Net
Useful life			16 years
Customer relationships \| Leveltek Processing, LLC
Goodwill and Other Intangible Assets, Net
Useful life			16 years
Customer relationships	$ 2,100