Condensed Consolidated Statements of Comprehensive Income - USD ($) shares in Thousands, $ in Thousands		3 Months Ended
		Apr. 30, 2016	Apr. 30, 2015
Revenues:
Subscription services		$ 96,032	$ 68,894
Professional services and other		23,732	21,029
Total revenues		119,764	89,923
Cost of revenues:
Cost of subscription services	[1]	21,745	15,873
Cost of professional services and other	[1]	19,346	16,112
Total cost of revenues	[1]	41,091	31,985
Gross profit		78,673	57,938
Operating expenses:
Research and development	[1]	22,073	12,957
Sales and marketing	[1]	26,723	15,496
General and administrative	[1]	12,071	8,560
Total operating expenses	[1]	60,867	37,013
Operating income		17,806	20,925
Other income, net		2,747	763
Income before income taxes		20,553	21,688
Provision for income taxes		8,044	8,706
Net income		12,509	12,982
Net income attributable to Class A and Class B common stockholders, basic and diluted		$ 12,505	$ 12,964
Net income per share attributable to Class A and Class B common stockholders:
Basic		$ 0.09	$ 0.10
Diluted		$ 0.09	$ 0.09
Weighted-average shares used to compute net income per share attributable to Class A and Class B common stockholders:
Basic		133,996	131,163
Diluted		145,708	144,734
Other comprehensive income (loss):
Net change in unrealized gains (losses) on available-for-sale investments		$ 174	$ (3)
Net change in cumulative foreign currency translation gain (loss)		113	(8)
Comprehensive income		$ 12,796	$ 12,971

[1] Includes stock-based compensation as follows:  Cost of revenues: Cost of subscription services$209 $111 Cost of professional services and other 1,178 742 Research and development 2,394 1,383 Sales and marketing 2,455 1,120 General and administrative 1,907 1,443 Total stock-based compensation$8,143 $4,799