Equity Incentive Plans and Stock-Based Compensation - Additional Information (Details) - USD ($) $ / shares in Units, $ in Thousands			1 Months Ended			12 Months Ended
	Jul. 29, 2022	Apr. 23, 2021	Jul. 31, 2023	Apr. 22, 2021	Jun. 30, 2018	Jan. 31, 2024	Jan. 31, 2023	Jan. 31, 2022	Apr. 30, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vested options expiration period after termination of employment						3 months
Weighted-average grant date fair value of stock options granted (in dollars per share)						$ 16.84	$ 12.23	$ 45.78
Intrinsic value of stock options exercised						$ 93,200	$ 83,600	$ 557,500
Cost not yet recognized for unvested options						102,500
Repurchase of unvested early exercised stock options						0	1,493	0
Stock-based compensation expense						$ 371,955	$ 369,840	$ 515,583
Re:infer
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted-average remaining period						1 year 6 months
Unrecognized compensation expense						$ 3,800
Stock issued at closing subject to clawback provisions (in shares)	400,000
ESPP
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares available for future issuances (in shares)				15,500,000
Period of shares automatically increase				10 years
Percentage of total number of shares				1.00%
Number of shares authorized (in shares)						21,500,000
Weighted-average remaining period						4 months 24 days
Unrecognized compensation expense						$ 3,000
Shares purchased (in shares)						1,400,000
Public offering price per share (in dollars per share)						$ 12.69
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award expiration period						10 years
Weighted-average remaining period						2 years 1 month 6 days
Accelerated vesting shares (in shares)							300,000	200,000
Incremental expense							$ 2,800	$ 2,900
Stock Options | Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period						3 years
Stock Options | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period						4 years
Early Exercised Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Repurchase of unvested early exercised stock options							$ 1,500
RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted-average remaining period						2 years 3 months 18 days
Accelerated vesting shares (in shares)							500,000	200,000
Incremental expense								$ 10,900
Fair value of RSUs vested						$ 329,600	$ 228,800	$ 1,400,000
Unrecognized compensation expense						$ 560,500
Net reduction in fair value of modified awards							$ (7,400)
Granted (in shares)						19,274,000
Granted (in dollars per share)						$ 16.95
Performance Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense						$ 0
Granted (in shares)			100,000
Granted (in dollars per share)			$ 18.08
Class A Common Stock | ESPP
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Purchase price of common stock, offering date, percent of market price				85.00%
Purchase price of common stock, purchase date, percent of market price				85.00%
Class A Common Stock | Early Exercised Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Repurchase of unvested early exercised stock options (in shares)						0	400,000
2021 Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Period of shares automatically increase				10 years
Percentage of total number of shares				5.00%
2021 Plan | RSUs | Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period						3 years
2021 Plan | RSUs | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period						4 years
2021 Plan | Class A Common Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares available for future issuances (in shares)						173,700,000
2015 Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares available for future issuances (in shares)					0
2018 Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares available for future issuances (in shares)									0
2018 Plan | RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award service period					4 years
Stock-based compensation expense		$ 233,000