CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Thousands	3 Months Ended
	Apr. 30, 2021	Apr. 30, 2020
Income Statement [Abstract]
Revenue	$ 956,237	$ 328,167
Cost of revenue	264,994	103,707
Gross profit	691,243	224,460
Operating expenses:
Research and development	65,175	26,389
Sales and marketing	245,667	121,556
General and administrative	154,089	53,130
Total operating expenses	464,931	201,075
Income from operations	226,312	23,385
Interest income and other, net	2,619	5,790
Income before provision for income taxes	228,931	29,175
Provision for income taxes	1,400	2,100
Net income	227,531	27,075
Undistributed earnings attributable to participating securities	(148)	(39)
Net income attributable to common stockholders	$ 227,383	$ 27,036
Net income per share attributable to common stockholders:
Basic (in dollars per share)	$ 0.77	$ 0.10
Diluted (in dollars per share)	$ 0.74	$ 0.09
Weighted-average shares used in computing net income per share attributable to common stockholders:
Basic (in shares)	293,794,778	279,891,111
Diluted (in shares)	305,412,419	295,184,958