Equity Plans and Stock-based Compensation - Stock-based Compensation Expense (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 31, 2022	Oct. 31, 2021	Oct. 31, 2022	Oct. 31, 2021
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Total stock-based compensation expense	$ 25,698	$ 16,022	$ 67,644	$ 51,893
Unrecognized stock-based compensation cost	206,938		206,938
Stock Options
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Total stock-based compensation expense	4,145	4,411	12,491	16,429
Stock Options	19,882		$ 19,882
Weighted average period (in years)			1 year 1 month 17 days
RSUs
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Total stock-based compensation expense	17,074	11,290	$ 45,287	35,143
Unrecognized compensation costs related to RSUs and ESPP	158,662		$ 158,662
Weighted average period (in years)			3 years 3 months 25 days
PRSUs
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Total stock-based compensation expense	2,696	0	$ 4,649	0
Unrecognized compensation costs related to RSUs and ESPP	19,498		$ 19,498
Weighted average period (in years)			2 years 8 months 1 day
ESPP
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Total stock-based compensation expense	1,783	321	$ 5,217	321
Unrecognized compensation costs related to RSUs and ESPP	8,896		$ 8,896
Weighted average period (in years)			1 year 10 months 9 days
Cost of revenue
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Total stock-based compensation expense	1,145	885	$ 3,271	3,073
Research and development
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Total stock-based compensation expense	10,200	5,840	27,598	20,198
Sales and marketing
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Total stock-based compensation expense	4,962	2,251	12,793	7,018
General and administrative
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Total stock-based compensation expense	$ 9,391	$ 7,046	$ 23,982	$ 21,604