Segment Information - Schedule of Long-Lived Assets by Geographic Area (Details) - USD ($) $ in Thousands	Jul. 31, 2018	Jan. 31, 2018
Revenues From External Customers And Long Lived Assets [Line Items]
Total long-lived assets	$ 101,718	$ 89,142	[1]
United States
Revenues From External Customers And Long Lived Assets [Line Items]
Total long-lived assets	97,250	85,430
Rest of the world
Revenues From External Customers And Long Lived Assets [Line Items]
Total long-lived assets	$ 4,468	$ 3,712

[1] *Prior period information has been adjusted to reflect the adoption impact of Accounting Standards Codification 606, Revenue from Contracts with Customers (ASC 606), which we adopted on February 1, 2018.