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Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

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Amount of cost not yet recognized for nonvested award under share-based payment arrangement.

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Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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Amount of cost to be recognized for nonvested award under share-based payment arrangement. Excludes share and unit options.

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Amount of cost to be recognized for option under share-based payment arrangement.

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Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition.

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The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash.

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Number of shares authorized for issuance under share-based payment arrangement.

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Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares.

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The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

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Maximum number of shares that may be issued in accordance with the plan as a proportion of outstanding capital stock.

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Per share or per unit amount of equity securities issued.

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Equity Incentive Plans and Stock-Based Compensation - Additional Information (Details) - USD ($)				1 Months Ended		3 Months Ended				6 Months Ended
	Jul. 31, 2022	Jul. 29, 2022	Apr. 23, 2021	Apr. 22, 2021	Sep. 30, 2020	Jul. 31, 2022	Apr. 30, 2022	Jul. 31, 2021	Apr. 30, 2021	Jul. 31, 2022	Jul. 31, 2021	Jan. 31, 2022
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted-average grant date fair value of stock options granted (in dollars per share)										$ 13.01
Intrinsic value of stock options exercised										$ 59,900,000
Cost not yet recognized for unvested options	$ 131,100,000					$ 131,100,000				131,100,000
Repurchase of unvested early exercised stock options										1,493,000	$ 0
Stock-based compensation expense						88,252,000		$ 92,613,000		189,706,000	343,448,000
Restricted stock awards issued, value						1,000
Capitalized stock-based compensation expenses relating to software development cost						0		$ 100,000		$ 0	$ 2,300,000
Re:infer
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock issued at closing subject to clawback provisions (in shares)		400,000
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted-average remaining period										3 years 1 month 6 days
Early Exercised Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Accrued proceeds from unvested early exercised stock options	0					0				$ 0		$ 2,800,000
Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted-average remaining period										3 years 1 month 6 days
Fair value of RSUs vested										$ 139,500,000
Unrecognized compensation expense	758,300,000					758,300,000				$ 758,300,000
Grant date fair value per share (in dollars per share)										$ 19.15
Restricted Stock Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted-average remaining period										2 years 1 month 6 days
Award vesting period					4 years
Unrecognized compensation expense	2,100,000					2,100,000				$ 2,100,000
Restricted stock awards issued (in shares)					100,000
Grant date fair value per share (in dollars per share)					$ 33.22
Restricted stock awards issued, value					$ 4,000,000
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)				15,900,000
Weighted-average remaining period										4 months 24 days
Unrecognized compensation expense	$ 3,400,000					$ 3,400,000				$ 3,400,000
Shares purchased (in shares)										600,000	0
Purchase price (in dollars per share)	$ 15.68					$ 15.68				$ 15.68
Common Stock \| Re:infer
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted-average remaining period	3 years
Unrecognized compensation expense	$ 7,600,000					$ 7,600,000				$ 7,600,000
Class A Common Stock \| Common Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Repurchase of unvested early exercised stock options (in shares)						441,000				400,000
Restricted stock awards issued (in shares)						3,183,000	3,499,000	2,492,000	389,000
Restricted stock awards issued, value						$ 1,000
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%
2021 Stock 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 Stock Plan \| Class A Common Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares available for future issuances (in shares)	145,900,000					145,900,000				145,900,000
2018 Stock Plan \| Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period			4 years
Stock-based compensation expense			$ 233,000,000