Intangible Assets - Intangible Assets (Detail) (USD $) In Thousands, unless otherwise specified	9 Months Ended	12 Months Ended
	Jun. 30, 2013	Sep. 30, 2012
Intangible Assets [Line Items]
Intangible assets, Gross carrying amount	$ 8,223	$ 8,223
Intangible assets, Accumulated amortization	(4,349)	(3,793)
Intangible assets, Net	3,874	4,430
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	(3,139)	(2,734)
Definite lived intangible assets, Net	1,718	2,123
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	(392)	(343)
Definite lived intangible assets, Net	138	187
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	(818)	(716)
Definite lived intangible assets, Net	1,438	1,540
Subtotal [Member]
Intangible Assets [Line Items]
Definite lived intangible assets, Gross Carrying Amount	7,643	7,643
Definite lived intangible assets, Accumulated Amortization	(4,349)	(3,793)
Definite lived intangible assets, Net	3,294	3,850
Trademarks [Member]
Intangible Assets [Line Items]
Unamortized intangible assets, Gross	580	580
Unamortized intangible assets, Net	$ 580	$ 580