Stock-Based Compensation - Components of Stock Based Compensation Expense (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 31, 2021	Oct. 31, 2020	Oct. 31, 2021	Oct. 31, 2020
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Total	$ 27,362	$ 4,595	$ 62,192	$ 9,834
Cost of revenue
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Total	1,202	66	2,425	201
Research and development
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Total	9,035	443	24,997	3,467
Sales and marketing
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Total	4,848	985	10,800	2,052
General and administrative
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Total	$ 12,277	$ 3,101	$ 23,970	$ 4,114