Equity - Narrative (Details) $ / shares in Units, $ in Thousands					1 Months Ended				2 Months Ended	3 Months Ended				9 Months Ended		13 Months Ended
	Mar. 03, 2021 shares	Mar. 01, 2021 vote $ / shares shares	Feb. 28, 2021 vote	Feb. 28, 2020	Sep. 30, 2020 USD ($) shares	Mar. 31, 2020 shares	Mar. 31, 2019 USD ($) shares	Dec. 31, 2017 $ / shares shares	Jun. 30, 2020 USD ($)	Oct. 31, 2021 USD ($) class $ / shares shares	Jul. 31, 2021 shares	Apr. 30, 2021 shares	Oct. 31, 2020 USD ($)	Oct. 31, 2021 USD ($) class $ / shares shares	Oct. 31, 2020 USD ($) $ / shares	Apr. 30, 2020 USD ($)	Jan. 31, 2021 USD ($) $ / shares shares	Feb. 29, 2020 $ / 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
Preferred stock, par value (in dollars per share) | $ / shares										$ 0.0001				$ 0.0001			$ 0.0001
Common stock, number of classes of stock | class										2				2
Conversion, percent threshold				10.00%
Common stock reserved for future issuances (shares)										111,787,754				111,787,754			112,494,580
Options granted (shares)														0
Granted (in dollars per share) | $ / shares															$ 22.67
Intrinsic value of shares exercised | $														$ 3,800,000	$ 544,500
Grant date fair value of vested shares | $														62,700	71,000
Proceeds from repayments of a nonrecourse promissory note | $														0	2,090
Share-based compensation | $										$ 144,387			$ 119,141	$ 459,392	157,790
Shares subject to repurchase (in shares)										66,515				66,515			245,633
Liabilities for common stock subject to repurchase | $										$ 500				$ 500			$ 1,200
Compensation modification cost | $															$ 2,700	$ 16,700
Unrecognized share-based compensation expense | $										$ 1,500,000				$ 1,500,000
Unrecognized share-based compensation expense recognition period (term)														3 years 1 month 6 days
Employee stock purchase rights under the 2020 ESPP
Share-based Compensation Arrangement by Share-based Payment Award
Common stock reserved for future issuances (shares)										8,208,724				8,208,724			5,700,000
Stock market discount														85.00%
Offering period														6 months
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
Vesting period (years)														4 years
Unvested shares (shares)										10,115,953	10,763,236	11,117,993		10,115,953			9,348,557
Vested (shares)										980,901	820,002	531,845
Share-based compensation | $					$ 55,500
2020 Plan | RSUs
Share-based Compensation Arrangement by Share-based Payment Award
Common stock reserved for future issuances (shares)										5,081,153				5,081,153			1,828,083
2012 Plan | Stock options
Share-based Compensation Arrangement by Share-based Payment Award
Common stock reserved for future issuances (shares)										47,781,688				47,781,688			64,574,656
Expiration period (years)														10 years
2012 Plan | RSUs
Share-based Compensation Arrangement by Share-based Payment Award
Common stock reserved for future issuances (shares)										5,034,800				5,034,800			7,520,474
Out of the Plans | RSA
Share-based Compensation Arrangement by Share-based Payment Award
Unvested shares (shares)										470,673	561,085	651,499		470,673			741,911
Vested (shares)										90,412	90,414	90,412
Out of the Plans | RSA | Privately-Held Company
Share-based Compensation Arrangement by Share-based Payment Award
Unvested shares (shares)										158,173				158,173
Issuance of common stock in connection with an acquisition (in shares)							661,635
Vested (shares)							215,031
Share-based compensation | $							$ 1,100
Vesting period (years)							4 years
Out of the Plans | RSA | Privately-Held Company | Share-based Payment Arrangement, Tranche One
Share-based Compensation Arrangement by Share-based Payment Award
Vesting period (years)							4 years
Out of the Plans | RSA | Promissory Notes
Share-based Compensation Arrangement by Share-based Payment Award
Vesting period (years)								5 years
Shares authorized (shares)								1,250,000
Shares issued (in dollars 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)										312,500				312,500
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
Common stock, par value (in dollars per share) | $ / shares		$ 0.0001								$ 0.0001				$ 0.0001			$ 0.0001
Common stock, voting rights, votes per share | vote		1
Class A Common Stock | Employee stock purchase rights under the 2020 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					185,461,432				185,461,432			355,000,000
Shares converted (in shares)	169,538,568	169,538,568
Common stock, par value (in dollars per share) | $ / shares		$ 0.0001								$ 0.0001				$ 0.0001			$ 0.0001
Common stock, voting rights, votes per share | vote			10
Shares issued (in dollars per share) | $ / shares																		$ 38.77
Shares issued for common stock (shares)						8,600,000