Condensed Consolidated Statements of Comprehensive Income - USD ($) shares in Thousands, $ in Thousands		3 Months Ended
		Apr. 30, 2020	Apr. 30, 2019
Revenues:
Total revenues		$ 337,106	$ 244,752
Cost of revenues:
Total cost of revenues	[1]	94,880	65,503
Gross profit		242,226	179,249
Operating expenses:
Research and development	[1]	62,237	44,973
Sales and marketing	[1]	55,755	39,617
General and administrative	[1]	36,669	23,490
Total operating expenses	[1]	154,661	108,080
Operating income		87,565	71,169
Other income, net		3,414	6,161
Income before income taxes		90,979	77,330
Provision for income taxes		4,409	3,881
Net income		86,570	73,449
Net income, basic and diluted		$ 86,570	$ 73,449
Net income per share:
Basic (in usd per share)		$ 0.58	$ 0.50
Diluted (in usd per share)		$ 0.54	$ 0.47
Weighted-average shares used to compute net income per share:
Basic (in shares)		149,541	146,708
Diluted (in shares)		159,474	157,910
Other comprehensive income:
Net change in unrealized gain on available-for-sale investments		$ 1,297	$ 962
Net change in cumulative foreign currency translation loss		389	(702)
Comprehensive income		88,256	73,709
Subscription services
Revenues:
Total revenues		270,235	198,115
Cost of revenues:
Total cost of revenues	[1]	43,212	30,378
Professional services and other
Revenues:
Total revenues		66,871	46,637
Cost of revenues:
Total cost of revenues	[1]	$ 51,668	$ 35,125

[1] Includes stock-based compensation as follows: Cost of revenues:       Cost of subscription services $ 1,019
  $ 385
Cost of professional services and other 5,074
  2,978
Research and development 11,401
  6,325
Sales and marketing 8,192
  5,152
General and administrative 11,221
  5,916
Total stock-based compensation $ 36,907
  $ 20,756