CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Thousands	12 Months Ended
	Jan. 31, 2021	Jan. 31, 2020	Jan. 31, 2019
Income Statement [Abstract]
Revenue	$ 2,651,368	$ 622,658	$ 330,517
Cost of revenue	821,989	115,396	61,001
Gross profit	1,829,379	507,262	269,516
Operating expenses:
Research and development	164,080	67,079	33,014
Sales and marketing	684,904	340,646	185,821
General and administrative	320,547	86,841	44,514
Total operating expenses	1,169,531	494,566	263,349
Income from operations	659,848	12,696	6,167
Interest income and other, net	18,186	13,666	2,182
Total	678,034	26,362	8,349
Provision for income taxes	5,718	1,057	765
Net income	672,316	25,305	7,584
Undistributed earnings attributable to participating securities	(789)	(3,555)	(7,584)
Net income attributable to common stockholders	$ 671,527	$ 21,750	$ 0
Net income per share attributable to common stockholders:
Basic (in dollars per share)	$ 2.37	$ 0.09	$ 0.00
Diluted (in dollars per share)	$ 2.25	$ 0.09	$ 0.00
Weighted-average shares used in computing net income per share attributable to common stockholders:
Basic (in shares)	283,853,654	233,641,336	84,483,094
Diluted (in shares)	298,127,669	254,298,014	116,005,681