Equity Incentive Plans - Summary of Stock-Based Compensation Expenses (Details) - USD ($) $ in Thousands	12 Months Ended
	Jan. 31, 2016	Jan. 31, 2015	Jan. 31, 2014
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock-based compensation expense	$ 58,225	$ 53,033	$ 21,566
Cost of Revenue Product
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock-based compensation expense	276	303	253
Cost of Revenue Support
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock-based compensation expense	2,388	1,273	316
Research and Development
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock-based compensation expense	31,135	22,512	11,477
Sales and Marketing
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock-based compensation expense	16,966	22,466	9,014
General and Administrative
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock-based compensation expense	$ 7,460	$ 6,479	$ 506