Stock-Based Compensation - Summary Stock Option Plan (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended	9 Months Ended	12 Months Ended
	Oct. 31, 2021	Oct. 31, 2021	Jan. 31, 2021
Number of Options
Outstanding, beginning of period (in shares)		37,231,191
Outstanding, end of period (in shares)	46,333,088	46,333,088	37,231,191
2013 Equity Incentive Plan
Number of Options
Outstanding, beginning of period (in shares)		37,231,191
Granted (in shares)	0	14,048,623
Exercised (in shares)		(5,003,134)
Forfeited (in shares)		(668,764)
Outstanding, end of period (in shares)	45,607,916	45,607,916	37,231,191
Expected to vest (in shares)	45,607,916	45,607,916
Options, vested and exercisable, number (in shares)	17,549,104	17,549,104
Weighted-Average Exercise Price
Outstanding, beginning of period (in USD per share)		$ 1.68
Granted (in USD per share)		9.66
Exercised (in USD per share)		1.37
Forfeited (in USD per share)		3.46
Outstanding, end of period (in USD per share)	$ 4.14	4.14	$ 1.68
Expected to vest (in USD per shares)	4.14	4.14
Options, vested and exercisable, weighted average exercise price (in USD per share)	$ 2.00	$ 2.00
Weighted-Average Remaining Contractual Term (in years)
Weighted-Average Remaining Contractual Term (in years), Outstanding		8 years 2 months 1 day	8 years 4 months 2 days
Expected to vest (in years)		8 years 2 months 1 day
Weighted-Average Remaining Contractual Term (in years), Vested and exercisable (in years)		7 years 3 months
Aggregate Intrinsic Value (in thousands)
Outstanding, beginning of period		$ 442,515
Outstanding, end of period	$ 2,839,436	2,839,436	$ 442,515
Expected to vest	2,839,436	2,839,436
Vested and exerisable	$ 1,130,248	$ 1,130,248