Condensed Consolidated Statements of Comprehensive Income (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended				6 Months Ended
	Jul. 31, 2014		Jul. 31, 2013		Jul. 31, 2014		Jul. 31, 2013
Revenues:
Subscription services	$ 56,572		$ 34,063		$ 105,093		$ 62,000
Professional services and other	19,092		15,518		37,292		30,369
Total revenues	75,664		49,581		142,385		92,369
Cost of revenues:
Cost of subscription services	13,346	[1]	7,948	[1]	25,386	[1]	14,898	[1]
Cost of professional services and other	14,790	[1]	11,195	[1]	28,700	[1]	21,954	[1]
Total cost of revenues	28,136	[1]	19,143	[1]	54,086	[1]	36,852	[1]
Gross profit	47,528		30,438		88,299		55,517
Operating expenses:
Research and development	9,787	[1]	6,357	[1]	18,779	[1]	11,884	[1]
Sales and marketing	13,810	[1]	9,610	[1]	26,624	[1]	17,272	[1]
General and administrative	7,146	[1]	4,633	[1]	13,554	[1]	8,350	[1]
Total operating expenses	30,743	[1]	20,600	[1]	58,957	[1]	37,506	[1]
Operating income	16,785		9,838		29,342		18,011
Other expense, net	(101)		(65)		(131)		(564)
Income before income taxes	16,684		9,773		29,211		17,447
Provision for income taxes	7,106		3,775		12,412		6,604
Net income	9,578		5,998		16,799		10,843
Net income attributable to Class A and Class B common stockholders, basic and diluted	9,490		1,275		16,643		2,222
Net income per share attributable to Class A and Class B common stockholders:
Basic	$ 0.07		$ 0.05		$ 0.13		$ 0.09
Diluted	$ 0.07		$ 0.03		$ 0.12		$ 0.06
Weighted-average shares used to compute earnings per share attributable to Class A and Class B common stockholders:
Basic	127,314		24,418		125,632		23,440
Diluted	143,353		37,038		143,506		35,833
Other comprehensive income:
Net change in unrealized gains on available-for-sale investments	(114)		(5)		(68)		(2)
Net change in cumulative foreign currency translation gain	(23)				(57)
Comprehensive income	$ 9,441		$ 5,993		$ 16,674		$ 10,841

[1] Includes stock-based compensation as follows: Cost of revenues: Cost of subscription services$54 $6 $107 $9 Cost of professional services and other 580 135 1,162 228 Research and development 874 271 1,761 466 Sales and marketing 760 299 1,536 482 General and administrative 1,132 504 2,090 765 Total stock-based compensation$3,400 $1,215 $6,656 $1,950