Summary of Significant Accounting Policies and Select Balance Sheet Information - Schedule of Intangible Assets (Detail) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2016	Sep. 30, 2015
Intangible Assets [Line Items]
Definite-lived intangible assets, Accumulated Amortization	$ (8,604)	$ (6,033)
Intangible assets, Gross Carrying Amount	31,129	8,793
Intangible assets, Net	$ 22,525	$ 2,760
Customer Lists and Relationships [Member]
Intangible Assets [Line Items]
Definite-lived intangible assets, Weighted Average Original Life (Years)	8 years 10 months 24 days
Definite-lived intangible assets, Gross Carrying Amount	$ 17,692
Definite-lived intangible assets, Accumulated Amortization	(6,123)
Definite-lived intangible assets, Net	$ 11,569
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	$ 8,724
Definite-lived intangible assets, Accumulated Amortization	(618)
Definite-lived intangible assets, Net	$ 8,106
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	(58)	(12)
Definite-lived intangible assets, Net	$ 172	$ 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	(1,275)	(1,128)
Definite-lived intangible assets, Net	1,046	1,193
Definite-Lived Intangible Assets [Member]
Intangible Assets [Line Items]
Definite-lived intangible assets, Gross Carrying Amount	29,497	8,213
Definite-lived intangible assets, Accumulated Amortization	(8,604)	(6,033)
Definite-lived intangible assets, Net	20,893	2,180
In-Process Research and Development [Member]
Intangible Assets [Line Items]
Indefinite-lived intangible assets, Net	987
Trademarks and Trade Names [Member]
Intangible Assets [Line Items]
Indefinite-lived intangible assets, Net	$ 645
Trademarks [Member]
Intangible Assets [Line Items]
Indefinite-lived intangible assets, Net		$ 580