Basis of Presentation - Finite-lived intangible asset (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Sep. 30, 2017
Finite-lived intangible asset
Gross Carrying Amount	$ 79,700	$ 51,000
Accumulated Amortization	3,618	1,134
Developed technology
Finite-lived intangible asset
Gross Carrying Amount	70,000	51,000
Accumulated Amortization	3,256	$ 1,134
Trade Name
Finite-lived intangible asset
Gross Carrying Amount	5,700
Accumulated Amortization	95
Customer Relationships
Finite-lived intangible asset
Gross Carrying Amount	4,000
Accumulated Amortization	$ 267