Goodwill and Intangible Assets - Schedule of Intangible Assets (Detail) - USD ($) $ in Thousands	3 Months Ended
	Dec. 31, 2016	Sep. 30, 2016
Indefinite Lived Intangible Assets By Major Class [Line Items]
Cost	$ 3,570
Accumulated Amortization	1,103
Net	$ 2,467	$ 2,783
Completed technologies [Member]
Indefinite Lived Intangible Assets By Major Class [Line Items]
Weighted Average Amortization Period	6 years
Cost	$ 2,370
Accumulated Amortization	725
Net	$ 1,645
Customer relationships [Member]
Indefinite Lived Intangible Assets By Major Class [Line Items]
Weighted Average Amortization Period	6 years
Cost	$ 970
Accumulated Amortization	297
Net	$ 673
Tradenames [Member]
Indefinite Lived Intangible Assets By Major Class [Line Items]
Weighted Average Amortization Period	5 years
Cost	$ 230
Accumulated Amortization	81
Net	$ 149