Stockholders’ Equity and Equity Incentive Plans - Additional Information (Details) $ / shares in Units, $ in Millions	3 Months Ended
	Apr. 30, 2021 USD ($) plan $ / shares shares	Jan. 31, 2021 $ / shares shares	Apr. 30, 2019 $ / shares shares
Class of Stock [Line Items]
Common stock, par value (in dollars per share) | $ / shares	$ 0.001	$ 0.001
Number of equity incentive plans | plan	2
Stock options
Class of Stock [Line Items]
Unrecognized stock-based compensation expenses related to outstanding unvested stock options | $	$ 39.6
Unrecognized stock-based compensation excepted to be recognized over a weighted-average period	1 year 3 months 18 days
RSUs
Class of Stock [Line Items]
Unrecognized stock-based compensation excepted to be recognized over a weighted-average period	2 years 6 months
Unrecognized stock-based compensation expenses | $	$ 772.9
Employee Stock Purchase Plan
Class of Stock [Line Items]
Unrecognized stock-based compensation excepted to be recognized over a weighted-average period	1 month 6 days
Unrecognized stock-based compensation expenses | $	$ 10.2
Class A Common Stock
Class of Stock [Line Items]
Common stock, shares authorized (in shares)	2,000,000,000	2,000,000,000
Class A Common Stock | Initial public offering
Class of Stock [Line Items]
Common stock, shares authorized (in shares)			2,000,000,000
Common stock, par value (in dollars per share) | $ / shares			$ 0.001
Class B Common Stock
Class of Stock [Line Items]
Common stock, shares authorized (in shares)	300,000,000	300,000,000
Class B Common Stock | Initial public offering
Class of Stock [Line Items]
Common stock, shares authorized (in shares)			300,000,000
Common stock, par value (in dollars per share) | $ / shares			$ 0.001