Goodwill and Intangible Assets - Schedule of Intangible Assets (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Dec. 31, 2018	Mar. 31, 2019	Sep. 30, 2018
Indefinite Lived Intangible Assets By Major Class [Line Items]
Cost		$ 38,587	$ 38,587
Accumulated Amortization		10,119	5,640
Net		$ 28,468	32,947
Completed technologies
Indefinite Lived Intangible Assets By Major Class [Line Items]
Weighted Average Amortization Period	6 years 4 months 24 days	6 years 4 months 24 days
Cost		$ 20,341	20,341
Accumulated Amortization		5,202	3,070
Net		$ 15,139	17,271
Customer relationships
Indefinite Lived Intangible Assets By Major Class [Line Items]
Weighted Average Amortization Period	4 years 9 months 18 days	4 years 9 months 18 days
Cost		$ 17,628	17,628
Accumulated Amortization		4,615	2,351
Net		$ 13,013	15,277
Trade names
Indefinite Lived Intangible Assets By Major Class [Line Items]
Weighted Average Amortization Period	4 years 6 months	4 years 6 months
Cost		$ 618	618
Accumulated Amortization		302	219
Net		$ 316	$ 399