Intangible Assets - Schedule of Intangible Assets (Detail) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Mar. 31, 2016	Sep. 30, 2015
Intangible Assets [Line Items]
Definite-lived intangible assets, Accumulated Amortization	$ (7,257)	$ (6,033)
Intangible assets, Gross Carrying Amount	31,316	8,793
Intangible assets, Net	$ 24,059	$ 2,760
Customer Lists and Relationships [Member]
Intangible Assets [Line Items]
Definite-lived intangible assets, Weighted Average Original Life (Years)	7 years 9 months 18 days
Definite-lived intangible assets, Gross Carrying Amount	$ 17,830
Definite-lived intangible assets, Accumulated Amortization	(5,271)
Definite-lived intangible assets, Net	$ 12,559
Customer Lists [Member]
Intangible Assets [Line Items]
Definite-lived intangible assets, Weighted Average Original Life (Years)		9 years
Definite-lived intangible assets, Gross Carrying Amount		$ 5,132
Definite-lived intangible assets, Accumulated Amortization		(4,363)
Definite-lived intangible assets, Net		$ 769
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	$ (530)	$ (530)
Developed Technology [Member]
Intangible Assets [Line Items]
Definite-lived intangible assets, Weighted Average Original Life (Years)	11 years 9 months 18 days
Definite-lived intangible assets, Gross Carrying Amount	$ 8,746
Definite-lived intangible assets, Accumulated Amortization	(219)
Definite-lived intangible assets, Net	$ 8,527
Non-compete [Member]
Intangible Assets [Line Items]
Definite-lived intangible assets, Weighted Average Original Life (Years)	5 years	5 years
Definite-lived intangible assets, Gross Carrying Amount	$ 230	$ 230
Definite-lived intangible assets, Accumulated Amortization	(35)	(12)
Definite-lived intangible assets, Net	$ 195	$ 218
Patents and Other [Member]
Intangible Assets [Line Items]
Definite-lived intangible assets, Weighted Average Original Life (Years)	16 years 6 months	16 years 9 months 18 days
Definite-lived intangible assets, Gross Carrying Amount	$ 2,321	$ 2,321
Definite-lived intangible assets, Accumulated Amortization	(1,202)	(1,128)
Definite-lived intangible assets, Net	1,119	1,193
In-Process Research and Development [Member]
Intangible Assets [Line Items]
Indefinite-lived intangible assets, Net	999
Definite-Lived Intangible Assets [Member]
Intangible Assets [Line Items]
Definite-lived intangible assets, Gross Carrying Amount	29,657	8,213
Definite-lived intangible assets, Accumulated Amortization	(7,257)	(6,033)
Definite-lived intangible assets, Net	22,400	2,180
Trademarks and Trade Names [Member]
Intangible Assets [Line Items]
Indefinite-lived intangible assets, Net	$ 660
Trademarks [Member]
Intangible Assets [Line Items]
Indefinite-lived intangible assets, Net		$ 580