Equity - Shares Outstanding (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Jan. 31, 2022	Jan. 31, 2021	Jan. 31, 2020	Jan. 31, 2019
Shares Available for Grant
Shares available for grant, beginning (in shares)	32,871,367	412,401	5,479,974
Shares authorized (in shares)	14,395,880	54,970,187	33,799,630
Shares ceased to be available for issuance (in shares)		(15,696,031)
Options granted (in shares)	0	(876,961)	(46,934,532)
Options forfeited (in shares)	1,629,050	3,406,764	7,831,769
Repurchase of unvested common stock (in shares)		40,000	252,260
Shares available for grant, ending (in shares)	45,446,313	32,871,367	412,401	5,479,974
Number of Options Outstanding
Shares outstanding, beginning (in shares)	64,574,656	80,903,200	51,535,443
Options granted (in shares)	0	876,961	46,934,532
Options exercised (in shares)	(20,902,509)	(13,798,741)	(9,735,006)
Options forfeited (in shares)	(1,629,050)	(3,406,764)	(7,831,769)
Shares outstanding, ending (in shares)	42,043,097	64,574,656	80,903,200	51,535,443
Weighted- Average Exercise Price
Shares outstanding, beginning balance (in dollars per share)	$ 7.04	$ 6.21	$ 2.63
Granted (in dollars per share)		34.83	9.21
Exercises (in dollars per share)	6.08	3.90	3.47
Forfeited (in dollars per share)	6.80	7.04	4.07
Shares outstanding, ending balance (in dollars per share)	$ 7.53	$ 7.04	$ 6.21	$ 2.63
Weighted-average remaining contractual life	6 years 10 months 24 days	7 years 8 months 12 days	8 years 7 months 6 days	8 years 9 months 18 days
Aggregate Intrinsic Value (in thousands)
Aggregate intrinsic value	$ 11,283,299	$ 17,138,896	$ 1,546,313	$ 287,993
Vested and exercisable (in shares)	22,862,872
Vested and exercisable, weighted average share price (in dollars per share)	$ 6.44
Vested and exercisable, weighted average remaining contractual life	6 years 6 months
Vested and exercisable, intrinsic value	$ 6,160,733
RSUs
Shares Available for Grant
RSU's granted (in shares)	(4,025,850)	(9,552,687)	(16,700)
RSU's forfeited (in shares)	575,866	167,694