Segment Information - Schedule of Long-Lived Assets by Geographic Area (Details) - USD ($) $ in Thousands	Jan. 31, 2017	Jan. 31, 2016
Revenues From External Customers And Long Lived Assets [Line Items]
Property and equipment, net	$ 81,695	$ 52,629
United States
Revenues From External Customers And Long Lived Assets [Line Items]
Property and equipment, net	78,692	50,501
Rest of the world
Revenues From External Customers And Long Lived Assets [Line Items]
Property and equipment, net	$ 3,003	$ 2,128