Segment Information - Schedule of Revenue by Geographic Area (Details) - USD ($) $ in Thousands	3 Months Ended
	Apr. 30, 2016	Apr. 30, 2015
Revenues From External Customers And Long Lived Assets [Line Items]
Total revenue	$ 139,947	$ 74,077
United States
Revenues From External Customers And Long Lived Assets [Line Items]
Total revenue	111,227	58,674
Rest of the world
Revenues From External Customers And Long Lived Assets [Line Items]
Total revenue	$ 28,720	$ 15,403