CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) shares in Thousands, $ in Thousands		3 Months Ended		9 Months Ended
		Oct. 31, 2021	Oct. 31, 2020	Oct. 31, 2021	Oct. 31, 2020
Revenues:
Total revenues		$ 476,111	$ 377,519	$ 1,365,278	$ 1,068,308
Cost of revenues:
Total cost of revenues	[1]	129,564	102,997	367,797	295,081
Gross profit	[1]	346,547	274,522	997,481	773,227
Operating expenses:
Research and development	[1]	98,635	79,992	276,760	212,282
Sales and marketing	[1]	72,423	57,982	208,822	172,909
General and administrative	[1]	42,781	35,243	126,121	109,085
Total operating expenses	[1]	213,839	173,217	611,703	494,276
Operating income		132,708	101,305	385,778	278,951
Other income, net		824	3,455	7,054	9,750
Income before income taxes		133,532	104,760	392,832	288,701
Provision for income taxes		27,663	7,801	62,538	11,621
Net income		$ 105,869	$ 96,959	$ 330,294	$ 277,080
Net income per share:
Basic (in usd per share)		$ 0.69	$ 0.64	$ 2.16	$ 1.84
Diluted (in usd per share)		$ 0.65	$ 0.60	$ 2.03	$ 1.73
Weighted-average shares used to compute net income per share:
Basic (in shares)		153,514	150,993	153,020	150,322
Diluted (in shares)		163,034	161,711	162,663	160,517
Other comprehensive income:
Net change in unrealized gain (loss) on available-for-sale investments		$ (2,741)	$ (1,230)	$ (4,044)	$ 1,198
Net change in cumulative foreign currency translation gain (loss)		(308)	(1,438)	(2,686)	1,844
Comprehensive income		102,820	94,291	323,564	280,122
Subscription services
Revenues:
Total revenues		380,738	302,938	1,088,293	856,675
Cost of revenues:
Total cost of revenues	[1]	59,648	45,845	164,774	132,457
Professional services and other
Revenues:
Total revenues		95,373	74,581	276,985	211,633
Cost of revenues:
Total cost of revenues	[1]	$ 69,916	$ 57,152	$ 203,023	$ 162,624

[1] (1) Includes stock-based compensation as follows:Cost of revenues:Cost of subscription services$1,292 $1,149 $3,514 $3,700 Cost of professional services and other9,616 7,510 26,579 19,902 Research and development22,311 17,685 61,463 45,523 Sales and marketing15,102 10,711 41,772 30,089 General and administrative13,724 11,918 39,591 36,032 Total stock-based compensation$62,045 $48,973 $172,919 $135,246