Equity Incentive Plans - Summary of Stock-Based Compensation Expenses (Details) - USD ($) $ in Thousands	3 Months Ended
	Apr. 30, 2016	Apr. 30, 2015
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock-based compensation expense	$ 22,134	$ 8,859
Cost of Revenue Product
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock-based compensation expense	102	56
Cost of Revenue Support
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock-based compensation expense	1,051	333
Research and Development
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock-based compensation expense	11,220	3,625
Sales and Marketing
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock-based compensation expense	7,237	3,444
General and Administrative
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock-based compensation expense	$ 2,524	$ 1,401