Segment Information - Schedule of Long-Lived Assets by Geographic Area (Details) - USD ($) $ in Thousands	Oct. 31, 2017	Jan. 31, 2017
Revenues From External Customers And Long Lived Assets [Line Items]
Total long-lived assets	$ 84,264	$ 81,695
United States
Revenues From External Customers And Long Lived Assets [Line Items]
Total long-lived assets	80,387	78,692
Rest of the world
Revenues From External Customers And Long Lived Assets [Line Items]
Total long-lived assets	$ 3,877	$ 3,003