Segment Information - Schedule of Long-Lived Assets by Geographic Area (Details) - USD ($) $ in Thousands	Apr. 30, 2017	Jan. 31, 2017
Revenues From External Customers And Long Lived Assets [Line Items]
Total long-lived assets	$ 82,293	$ 81,695
United States
Revenues From External Customers And Long Lived Assets [Line Items]
Total long-lived assets	79,491	78,692
Rest of the world
Revenues From External Customers And Long Lived Assets [Line Items]
Total long-lived assets	$ 2,802	$ 3,003