Goodwill and Other Intangible Assets - Summary of Other Intangible Asset Balances (Details) - USD ($) $ in Thousands	Oct. 31, 2017	Jan. 31, 2017
Finite Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 21,069	$ 7,284
Accumulated Amortization	(3,840)	(1,436)
Net Carrying Amount	17,229	5,848
Developed technology
Finite Lived Intangible Assets [Line Items]
Gross Carrying Amount	17,085	7,210
Accumulated Amortization	(3,385)	(1,393)
Net Carrying Amount	13,700	5,817
Customer relationships
Finite Lived Intangible Assets [Line Items]
Gross Carrying Amount	3,174	74
Accumulated Amortization	(376)	(43)
Net Carrying Amount	2,798	$ 31
Trademarks
Finite Lived Intangible Assets [Line Items]
Gross Carrying Amount	160
Accumulated Amortization	(79)
Net Carrying Amount	81
In-process research and development
Finite Lived Intangible Assets [Line Items]
Gross Carrying Amount	650
Net Carrying Amount	$ 650