CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 31, 2021	Jul. 31, 2020	Jul. 31, 2021	Jul. 31, 2020
Income Statement [Abstract]
Revenue	$ 1,021,495	$ 663,520	$ 1,977,732	$ 991,687
Cost of revenue	261,256	192,271	526,250	295,978
Gross profit	760,239	471,249	1,451,482	695,709
Operating expenses:
Research and development	82,311	42,734	147,486	69,123
Sales and marketing	271,179	159,173	516,846	280,729
General and administrative	112,146	81,238	266,235	134,368
Total operating expenses	465,636	283,145	930,567	484,220
Income from operations	294,603	188,104	520,915	211,489
Gains on strategic investments	32,076	0	32,076	2,538
Interest income and other, net	(2,795)	2,081	(176)	5,333
Income before provision for income taxes	323,884	190,185	552,815	219,360
Provision for income taxes	6,800	4,196	8,200	6,296
Net income	317,084	185,989	544,615	213,064
Undistributed earnings attributable to participating securities	(154)	(247)	(309)	(305)
Net income attributable to common stockholders	$ 316,930	$ 185,742	$ 544,306	$ 212,759
Net income per share attributable to common stockholders:
Basic (in dollars per share)	$ 1.07	$ 0.66	$ 1.85	$ 0.76
Diluted (in dollars per share)	$ 1.04	$ 0.63	$ 1.78	$ 0.72
Weighted-average shares used in computing net income per share attributable to common stockholders:
Basic (in shares)	295,712,675	282,850,805	294,769,619	281,394,901
Diluted (in shares)	305,861,051	297,162,309	305,652,628	296,408,229