CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Thousands	3 Months Ended
	Apr. 30, 2020	Apr. 30, 2019
Income Statement [Abstract]
Revenue	$ 328,167	$ 121,988
Cost of revenue	103,707	24,104
Gross profit	224,460	97,884
Operating expenses:
Research and development	26,389	13,783
Sales and marketing	121,556	64,041
General and administrative	53,130	18,503
Total operating expenses	201,075	96,327
Income from operations	23,385	1,557
Interest income and other, net	5,790	973
Net income before provision for income taxes	29,175	2,530
Provision for income taxes	2,100	316
Net income	27,075	2,214
Undistributed earnings attributable to participating securities	(39)	(2,016)
Net income attributable to common stockholders	$ 27,036	$ 198
Net income per share attributable to common stockholders:
Basic (in dollars per share)	$ 0.10	$ 0.00
Diluted (in dollars per share)	$ 0.09	$ 0.00
Weighted-average shares used in computing net income per share attributable to common stockholders:
Basic (in shares)	279,891,111	109,708,898
Diluted (in shares)	295,184,958	136,428,379