Segment Information - Schedule of Long-Lived Assets by Geographic Area (Details) - USD ($) $ in Thousands	Jan. 31, 2016	Jan. 31, 2015
Revenues From External Customers And Long Lived Assets [Line Items]
Property and equipment, net	$ 52,629	$ 39,859
United States
Revenues From External Customers And Long Lived Assets [Line Items]
Property and equipment, net	50,501	39,069
Rest of the world
Revenues From External Customers And Long Lived Assets [Line Items]
Property and equipment, net	$ 2,128	$ 790