Income Taxes - Schedule of Geographical Breakdown of Income (Loss) before Provision for Income Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
	Jan. 31, 2017	Jan. 31, 2016	Jan. 31, 2015
Income Tax Disclosure [Abstract]
Domestic	$ (200,355)	$ (195,019)	$ (186,922)
International	(42,824)	(17,164)	5,028
Loss before provision for income taxes	$ (243,179)	$ (212,183)	$ (181,894)