Stockholders' Equity and Equity Incentive Plans - Additional Information (Details)	1 Months Ended	12 Months Ended
	Apr. 30, 2019 USD ($) vote $ / shares shares	Jan. 31, 2024 USD ($) $ / shares shares	Jan. 31, 2023 USD ($) $ / shares shares	Jan. 31, 2022 USD ($) shares	Feb. 29, 2024 USD ($)	Feb. 28, 2022 USD ($)	Apr. 23, 2019 shares	Nov. 30, 2018 vote $ / shares shares
Class of Stock [Line Items]
Common stock, conversion features, term (in months)		6 months
Initial offering period (in years)		15 years
Common stock, par value (in dollars per share) | $ / shares		$ 0.001	$ 0.001
Shares granted (in shares)		0	0	0
Aggregate intrinsic value, exercised | $		$ 90,039,000	$ 121,500,000	$ 843,000,000
Number of shares available for future issuance (in shares)		96,713,028	92,819,161
Number of purchase periods | vote	4
Stock options
Class of Stock [Line Items]
Number of shares available for future issuance (in shares)		3,314,228	4,800,616
Unvested RSUs
Class of Stock [Line Items]
Unrecognized compensation cost | $			$ 207,700,000
Unrecognized stock-based compensation expenses | $		$ 1,782,200,000
Unrecognized stock-based compensation excepted to be recognized over a weighted-average period (in years)		2 years 6 months
Number of shares available for future issuance (in shares)		26,040,557	21,868,533
Purchase rights committed under the ESPP
Class of Stock [Line Items]
Unrecognized stock-based compensation expenses | $		$ 38,600,000
Unrecognized stock-based compensation excepted to be recognized over a weighted-average period (in years)		1 year 1 month 6 days
Number of shares available for future issuance (in shares)		2,086,604	2,851,856
Maximum number of shares per employee (in shares)	3,000
Consecutive offering period (in months)	27 months
2019 Plan
Class of Stock [Line Items]
Vesting period of awards (in years)	4 years
Maximum term (in years)	10 years
Shares reserved for issuance (as a percent)	5.00%
2019 Employee Stock Purchase Plan | Purchase rights committed under the ESPP
Class of Stock [Line Items]
Number of shares available for future issuance (in shares)		14,712,385	11,930,797
Percent of outstanding stock, maximum (as a percent)	1.00%
Number of additional shares allowable under the plan (in shares)	7,500,000
Class A
Class of Stock [Line Items]
Common stock number of votes per share | vote								1
Common stock, conversion basis (in shares)								1
Common stock, shares authorized (in shares)	2,000,000,000	2,000,000,000	2,000,000,000					320,000,000
Common stock, par value (in dollars per share) | $ / shares	$ 0.001							$ 0.001
Stock repurchase program, amount authorized | $						$ 1,000,000,000
Stock prepurchased and retired (in shares)			11,170,907
Stock repurchased and retired | $			$ 1,000,000,000
Class A | Subsequent Event
Class of Stock [Line Items]
Stock repurchase program, amount authorized | $					$ 1,500,000,000
Class A | Purchase rights committed under the ESPP
Class of Stock [Line Items]
Percentage of purchase price of common stock to fair market value of common stock on offering or purchase date (as a percent)	85.00%
ESPP excess rate purchase right, value | $	$ 25,000
Shares issued of common stock (in shares)		921,892	678,279	838,395
Class A | 2019 Plan
Class of Stock [Line Items]
Number of shares authorized (in shares)	58,300,889
Number of additional shares authorized under the plan (in shares)	34,000,000
Class A | 2011 Plan
Class of Stock [Line Items]
Other shares authorized (in shares)	24,300,889
Class A | 2019 Employee Stock Purchase Plan | Purchase rights committed under the ESPP
Class of Stock [Line Items]
Number of shares available for future issuance (in shares)	9,000,000
Class B
Class of Stock [Line Items]
Common stock number of votes per share | vote								10
Common stock, conversion basis (in shares)								1
Common stock, shares authorized (in shares)		300,000,000	300,000,000				300,000,000	300,000,000
Common stock, par value (in dollars per share) | $ / shares	$ 0.001							$ 0.001