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Common Stock Subject To Repurchase, Liability

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Common Stock Subject To Repurchase, Shares

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Common Stock, Votes Per Share

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Conversion, Percent Threshold Outstanding

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Sale Of Stock, Third Party Transaction, Share Price

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Share-based Compensation Arrangement by Share-based Payment Award, Base Number Of Options Issuable

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Share-based Compensation Arrangement By Share-based Payment Award, Stock Plan Offering Period

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

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Aggregate number of common shares reserved for future issuance.

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Face amount or stated value per share of common stock.

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The maximum number of common shares permitted to be issued by an entity's charter and bylaws.

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Contractual interest rate for funds borrowed, under the debt agreement.

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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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Face amount or stated value per share of preferred stock nonredeemable or redeemable solely at the option of the issuer.

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The maximum number of nonredeemable preferred shares (or preferred stock redeemable solely at the option of the issuer) permitted to be issued by an entity's charter and bylaws.

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Cash inflow from repayment of loans for purchasing common stock.

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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 number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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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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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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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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An excess of the fair value of the modified award over the fair value of the award immediately before the modification.

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Number of shares issued under share-based payment arrangement.

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Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Fair value of options vested. Excludes equity instruments other than options, for example, but not limited to, share units, stock appreciation rights, restricted stock.

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Purchase price of common stock expressed as a percentage of its fair value.

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Per share or per unit amount of equity securities issued.

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Equity - Narrative (Details) $ / shares in Units, $ in Thousands		1 Months Ended		2 Months Ended	3 Months Ended		9 Months Ended		13 Months Ended
	Oct. 31, 2020 USD ($) class $ / shares shares	Mar. 31, 2020 shares	Dec. 31, 2017 $ / shares shares	Jun. 30, 2020 USD ($)	Oct. 31, 2020 USD ($) class $ / shares shares	Oct. 31, 2019 USD ($)	Oct. 31, 2020 USD ($) class $ / shares shares	Oct. 31, 2019 USD ($) $ / shares	Apr. 30, 2020 USD ($) shares	Sep. 18, 2020 vote $ / shares shares	Jul. 31, 2020 shares	Feb. 29, 2020 $ / shares	Jan. 31, 2020 USD ($) $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award
Preferred stock, shares authorized (in shares)	200,000,000				200,000,000		200,000,000			200,000,000			0
Preferred stock, par value (in dollars per share) \| $ / shares	$ 0.0001				$ 0.0001		$ 0.0001			$ 0.0001			$ 0.0001
Common stock, number of classes of stock \| class	2				2		2
Conversion, percent threshold							10.00%
Common stock reserved for future issuances (shares)	117,292,639				117,292,639		117,292,639						251,269,209
Granted (per share) \| $ / shares							$ 22.67	$ 4.29
Intrinsic value of shares exercised \| $							$ 544,500	$ 55,700
Grant date fair value of vested shares \| $							71,000	38,800
Proceeds from repayments of a nonrecourse promissory note \| $							$ 2,090	0
Shares subject to repurchase (in shares)	338,800				338,800		338,800						2,104,331
Liabilities for common stock subject to repurchase \| $	$ 1,400				$ 1,400		$ 1,400						$ 4,500
Compensation modification cost \| $							2,700	11,100	$ 16,700
Share-based compensation \| $					119,141	$ 22,958	157,790	57,425
Unrecognized share-based compensation expense \| $	$ 664,500				$ 664,500		$ 664,500
Unrecognized share-based compensation expense recognition period (term)	2 years 2 months 12 days
ESPP
Share-based Compensation Arrangement by Share-based Payment Award
Common stock reserved for future issuances (shares)	5,700,000				5,700,000		5,700,000						0
Offering period							6 months
Stock market discount							85.00%
Stock options
Share-based Compensation Arrangement by Share-based Payment Award
Vesting period (years)							4 years
Expiration period (years)							10 years
RSUs
Share-based Compensation Arrangement by Share-based Payment Award
Unvested shares (shares)	7,616,097				7,616,097		7,616,097		2,285,492		4,853,231		0
Share-based compensation \| $							$ 55,500
The Plan \| RSA
Share-based Compensation Arrangement by Share-based Payment Award
Unvested shares (shares)	0				0		0		0		0		16,700
2012 Plan \| Stock options
Share-based Compensation Arrangement by Share-based Payment Award
Common stock reserved for future issuances (shares)	69,634,367				69,634,367		69,634,367						80,903,200
2012 Plan \| RSA
Share-based Compensation Arrangement by Share-based Payment Award
Grant date fair value of shares other than options vested \| $							$ 100	$ 4,900
2012 Plan \| RSUs
Share-based Compensation Arrangement by Share-based Payment Award
Common stock reserved for future issuances (shares)	7,616,097				7,616,097		7,616,097						0
Out of the Plan \| RSA
Share-based Compensation Arrangement by Share-based Payment Award
Unvested shares (shares)	832,324				832,324		832,324		1,575,650		922,736		1,603,562
Out of the Plan \| RSA \| Promissory Notes
Share-based Compensation Arrangement by Share-based Payment Award
Shares authorized (shares)			1,250,000
Shares issued (per share) \| $ / shares			$ 1.59
Debt instrument, stated interest rate			2.11%
Proceeds from repayments of a nonrecourse promissory note \| $				$ 2,100
Unvested shares (shares)	562,500				562,500		562,500
Class A Common Stock
Share-based Compensation Arrangement by Share-based Payment Award
Common stock, shares authorized (in shares)	2,500,000,000				2,500,000,000		2,500,000,000			2,500,000,000			2,000
Votes per share (votes) \| vote										1
Common stock, par value (in dollars per share) \| $ / shares	$ 0.0001				$ 0.0001		$ 0.0001			$ 0.0001			$ 0.0001
Class A Common Stock \| ESPP
Share-based Compensation Arrangement by Share-based Payment Award
Common stock reserved for future issuances (shares)										5,700,000
Class A Common Stock \| 2020 Plan
Share-based Compensation Arrangement by Share-based Payment Award
Common stock reserved for future issuances (shares)										34,100,000
Maximum common shares authorized to be outstanding (shares)										78,816,888
Class B Common Stock
Share-based Compensation Arrangement by Share-based Payment Award
Common stock, shares authorized (in shares)	355,000,000				355,000,000		355,000,000			355,000,000			312,000,000
Votes per share (votes) \| vote										10
Common stock, par value (in dollars per share) \| $ / shares	$ 0.0001				$ 0.0001		$ 0.0001			$ 0.0001			$ 0.0001
Shares issued (per share) \| $ / shares												$ 38.77
Shares issued for common stock (shares)		8,600,000