Condensed Consolidated Statements of Comprehensive Income - USD ($) shares in Thousands, $ in Thousands		3 Months Ended
		Apr. 30, 2017	Apr. 30, 2016
Revenues:
Subscription services		$ 127,277	$ 96,032
Professional services and other		30,641	23,732
Total revenues		157,918	119,764
Cost of revenues:
Cost of subscription services	[1]	26,138	21,745
Cost of professional services and other	[1]	22,744	19,346
Total cost of revenues	[1]	48,882	41,091
Gross profit		109,036	78,673
Operating expenses:
Research and development	[1]	28,311	22,073
Sales and marketing	[1]	29,810	26,723
General and administrative	[1]	13,576	12,071
Total operating expenses	[1]	71,697	60,867
Operating income		37,339	17,806
Other income, net		591	2,747
Income before income taxes		37,930	20,553
Provision for income taxes		1,907	8,044
Net income		36,023	12,509
Net income attributable to Class A and Class B common stockholders, basic and diluted		$ 36,023	$ 12,505
Net income per share attributable to Class A and Class B common stockholders:
Basic		$ 0.26	$ 0.09
Diluted		$ 0.24	$ 0.09
Weighted-average shares used to compute net income per share attributable to Class A and Class B common stockholders:
Basic		137,096	133,996
Diluted		151,056	145,708
Other comprehensive income (loss):
Net change in unrealized gains (losses) on available-for-sale investments		$ (106)	$ 174
Net change in cumulative foreign currency translation gain (loss)		905	113
Comprehensive income		$ 36,822	$ 12,796

[1] Includes stock-based compensation as follows:  Cost of revenues: Cost of subscription services$342 $209 Cost of professional services and other 1,689 1,178 Research and development 3,802 2,394 Sales and marketing 3,847 2,455 General and administrative 2,108 1,907 Total stock-based compensation$11,788 $8,143