Condensed Consolidated Statements of Comprehensive Income (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended				9 Months Ended
	Oct. 31, 2013		Oct. 31, 2012		Oct. 31, 2013		Oct. 31, 2012
Revenues:
Subscription services	$ 38,935		$ 19,969		$ 100,935		$ 49,171
Professional services and other	16,044		15,827		46,413		40,589
Total revenues	54,979		35,796		147,348		89,760
Cost of revenues:
Cost of subscription services	9,511	[1]	5,160	[1]	24,409	[1]	12,909	[1]
Cost of professional services and other	11,881	[1]	10,696	[1]	33,835	[1]	27,346	[1]
Total cost of revenues	21,392	[1]	15,856	[1]	58,244	[1]	40,255	[1]
Gross profit	33,587	[1]	19,940	[1]	89,104	[1]	49,505	[1]
Operating expenses:
Research and development	6,585	[1]	3,605	[1]	18,469	[1]	9,946	[1]
Sales and marketing	11,467	[1]	5,316	[1]	28,739	[1]	13,304	[1]
General and administrative	5,550	[1]	2,235	[1]	13,900	[1]	5,584	[1]
Total operating expenses	23,602	[1]	11,156	[1]	61,108	[1]	28,834	[1]
Operating income	9,985		8,784		27,996		20,671
Other income (expense), net	125		74		(439)		(337)
Income before income taxes	10,110		8,858		27,557		20,334
Provision for income taxes	3,585		3,109		10,189		7,235
Net income	6,525		5,749		17,368		13,099
Net income attributable to Class A and Class B common stockholders
Basic	2,339		1,062		4,613		2,331
Diluted	6,387		1,062		16,937		2,331
Net income per share attributable to Class A and Class B common stockholders:
Basic	$ 0.07		$ 0.05		$ 0.16		$ 0.12
Diluted	$ 0.05		$ 0.03		$ 0.13		$ 0.08
Weighted-average shares used to compute earnings per share attributable to Class A and Class B common stockholders:
Basic	35,802		20,743		28,519		19,834
Diluted	131,963		30,369		129,601		29,160
Other comprehensive income:
Net change in unrealized gains on available-for-sale investments	8				6
Comprehensive income	$ 6,533		$ 5,749		$ 17,374		$ 13,099

[1] Includes stock-based compensation as follows: Cost of revenues: Cost of subscription services $ 49 $ 1 $ 58 $ 2 Cost of professional services and other 230 30 458 81 Research and development 429 65 895 155 Sales and marketing 488 34 970 97 General and administrative 890 51 1,655 155