Intangible Assets - Schedule of Intangible Assets (Detail) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Jun. 30, 2015	Sep. 30, 2014
Intangible Assets [Line Items]
Intangible assets, Gross Carrying Amount	$ 8,223	$ 8,223
Definite-lived intangible assets, Accumulated Amortization	(5,834)	(5,277)
Intangible assets, Net	$ 2,389	$ 2,946
Customer Lists [Member]
Intangible Assets [Line Items]
Definite-lived intangible assets, Weighted Average Original Life (Years)	9 years	9 years
Definite-lived intangible assets, Gross Carrying Amount	$ 4,857	$ 4,857
Definite-lived intangible assets, Accumulated Amortization	(4,218)	(3,813)
Definite-lived intangible assets, Net	$ 639	$ 1,044
Core Technology [Member]
Intangible Assets [Line Items]
Definite-lived intangible assets, Weighted Average Original Life (Years)	8 years	8 years
Definite-lived intangible assets, Gross Carrying Amount	$ 530	$ 530
Definite-lived intangible assets, Accumulated Amortization	(524)	(475)
Definite-lived intangible assets, Net	$ 6	$ 55
Patents and Other [Member]
Intangible Assets [Line Items]
Definite-lived intangible assets, Weighted Average Original Life (Years)	16 years 9 months 18 days	16 years 9 months 18 days
Definite-lived intangible assets, Gross Carrying Amount	$ 2,256	$ 2,256
Definite-lived intangible assets, Accumulated Amortization	(1,092)	(989)
Definite-lived intangible assets, Net	1,164	1,267
Definite-Lived Intangible Assets [Member]
Intangible Assets [Line Items]
Definite-lived intangible assets, Gross Carrying Amount	7,643	7,643
Definite-lived intangible assets, Accumulated Amortization	(5,834)	(5,277)
Definite-lived intangible assets, Net	1,809	2,366
Trademarks [Member]
Intangible Assets [Line Items]
Indefinite-lived intangible assets, Net	$ 580	$ 580