Condensed Consolidated Statements of Comprehensive Income (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended				9 Months Ended
	Oct. 31, 2014		Oct. 31, 2013		Oct. 31, 2014		Oct. 31, 2013
Revenues:
Subscription services	$ 61,435		$ 38,935		$ 166,528		$ 100,935
Professional services and other	22,390		16,044		59,682		46,413
Total revenues	83,825		54,979		226,210		147,348
Cost of revenues:
Cost of subscription services	14,409	[1]	9,511	[1]	39,795	[1]	24,409	[1]
Cost of professional services and other	16,007	[1]	11,881	[1]	44,707	[1]	33,835	[1]
Total cost of revenues	30,416	[1]	21,392	[1]	84,502	[1]	58,244	[1]
Gross profit	53,409		33,587		141,708		89,104
Operating expenses:
Research and development	10,635	[1]	6,585	[1]	29,414	[1]	18,469	[1]
Sales and marketing	14,251	[1]	11,467	[1]	40,875	[1]	28,739	[1]
General and administrative	8,582	[1]	5,550	[1]	22,136	[1]	13,900	[1]
Total operating expenses	33,468	[1]	23,602	[1]	92,425	[1]	61,108	[1]
Operating income	19,941		9,985		49,283		27,996
Other income (expense), net	(989)		125		(1,120)		(439)
Income before income taxes	18,952		10,110		48,163		27,557
Provision for income taxes	8,694		3,585		21,106		10,189
Net income	10,258		6,525		27,057		17,368
Net income attributable to Class A and Class B common stockholders:
Basic	10,198		2,339		26,851		4,613
Diluted	10,198		6,387		26,851		16,937
Net income per share attributable to Class A and Class B common stockholders:
Basic	$ 0.08		$ 0.07		$ 0.21		$ 0.16
Diluted	$ 0.07		$ 0.05		$ 0.19		$ 0.13
Weighted-average shares used to compute earnings per share attributable to Class A and Class B common stockholders:
Basic	129,212		35,802		126,836		28,519
Diluted	144,289		131,963		144,082		129,601
Other comprehensive income:
Net change in unrealized gains on available-for-sale investments	97		8		29		6
Net change in cumulative foreign currency translation gain	(15)				(72)
Comprehensive income	$ 10,340		$ 6,533		$ 27,014		$ 17,374

[1] Includes stock-based compensation as follows: Cost of revenues: Cost of subscription services$74 $49 $181 $58 Cost of professional services and other 549 230 1,711 458 Research and development 942 429 2,703 895 Sales and marketing 754 488 2,290 970 General and administrative 1,266 890 3,356 1,655 Total stock-based compensation$3,585 $2,086 $10,241 $4,036