CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands		12 Months Ended
		Jan. 31, 2016	Jan. 31, 2015	Jan. 31, 2014
Revenues
License		$ 405,399	$ 283,191	$ 199,024
Maintenance and services		263,036	167,684	103,599
Total revenues		668,435	450,875	302,623
Cost of revenues
License	[1]	9,080	1,859	330
Maintenance and services	[1]	105,042	66,519	35,495
Total cost of revenues	[1]	114,122	68,378	35,825
Gross profit		554,313	382,497	266,798
Operating expenses
Research and development	[1]	215,309	150,790	75,895
Sales and marketing	[1]	505,348	344,471	215,335
General and administrative	[1]	121,579	103,046	53,875
Total operating expenses	[1]	842,236	598,307	345,105
Operating loss		(287,923)	(215,810)	(78,307)
Interest and other income (expense), net
Interest income, net		1,798	754	225
Other income (expense), net		(519)	216	(920)
Total interest and other income (expense), net		1,279	970	(695)
Loss before income taxes		(286,644)	(214,840)	(79,002)
Provision for income taxes (benefit)		(7,872)	2,276	6
Net loss		$ (278,772)	$ (217,116)	$ (79,008)
Basic and diluted net loss per share (in dollars per share)		$ (2.20)	$ (1.81)	$ (0.75)
Weighted-average shares used in computing basic and diluted net loss per share (in shares)		126,746	119,775	105,067

[1] Amounts include stock-based compensation expense as follows: cost of revenues $26,057 thousand, $17,189 thousand, $5,283 thousand, research and development 89,197 thousand, 60,777 thousand, 20,829 thousand, sales and marketing 130,054 thousand, 90,064 thousand, 30,012 thousand, and general and administrative 46,949 thousand, 46,149 thousand, 13,244 thousand for the years ended January 31, 2016, 2015 and 2014 respectively.