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Stock-Based Compensation - Additional Information (Details) $ / shares in Units, $ in Thousands		1 Months Ended		3 Months Ended		9 Months Ended		12 Months Ended
	Aug. 28, 2021 installment shares	May 31, 2019 purchasePeriod shares	Sep. 30, 2018 tranche installment	Oct. 31, 2021 USD ($) shares	Oct. 31, 2020 USD ($) $ / shares shares	Oct. 31, 2021 USD ($) changeInContribution $ / shares shares	Oct. 31, 2020 USD ($) $ / shares shares	Jan. 31, 2021 USD ($) shares	May 31, 2021 shares
Stock Based Compensation
Options unvested (in shares) \| shares				378,031		378,031
Aggregate intrinsic value of options vested and exercisable				$ 790,100		$ 790,100		$ 711,400
Weighted-average remaining contractual term of options vested and exercisable (in years)						6 years		6 years 4 months 24 days
Options granted (in shares) \| shares				0		93,000
Weighted-average grant date fair value of options granted (in usd per share) \| $ / shares					$ 121.00	$ 180.08	$ 66.31
Total intrinsic value of options exercised				$ 94,900	$ 162,400	$ 483,300	$ 516,400
Aggregate intrinsic value of stock options outstanding				1,200,000		$ 1,200,000		$ 1,400,000
Weighted-average remaining contractual term of stock options outstanding (in years)						6 years 4 months 24 days		7 years
Total unrecognized stock-based compensation expenses related to unvested options				$ 21,000		$ 21,000		$ 24,300
Issuance of common stock upon exercise of options (in shares) \| shares				0	0	0	0
Number of shares of common stock related to early exercised stock options subject to repurchase (in shares) \| shares				279,409		279,409		548,028
Value of common stock related to early exercised stock options subject to repurchase				$ 3,000		$ 3,000		$ 5,400
Maximum number of additional shares of common stock that may be issued (in shares) \| shares									5,000,000
Employee payroll contributions accrued				94,738		$ 94,738		$ 71,907
Stock options
Stock Based Compensation
Expected to be amortized over weighted-average vesting period (in years)						1 year 4 months 24 days		1 year 8 months 12 days
Stock options \| Minimum
Stock Based Compensation
Risk-free interest rate						0.60%	0.20%
Expected stock price volatility						36.10%	35.80%
Stock options \| Maximum
Stock Based Compensation
Risk-free interest rate						1.00%	0.40%
Expected stock price volatility						37.10%	37.30%
Service-based vesting
Stock Based Compensation
Number of vesting schedules \| tranche			4
Service-based vesting \| Vesting one
Stock Based Compensation
Vesting percentage			10.00%			25.00%
Number of quarterly installments \| installment			12
Service-based vesting \| Vesting two
Stock Based Compensation
Vesting percentage			15.00%
Number of quarterly installments \| installment			16
Service-based vesting \| Vesting three
Stock Based Compensation
Vesting percentage			25.00%
Number of quarterly installments \| installment			8
Service-based vesting \| Vesting four
Stock Based Compensation
Vesting percentage			50.00%
Number of quarterly installments \| installment			16
RSUs
Stock Based Compensation
Expected to be amortized over weighted-average vesting period (in years)						2 years 4 months 24 days
Total unrecognized stock-based compensation expenses related to unvested RSUs/PSUs				719,800		$ 719,800
PSUs
Stock Based Compensation
Expected to be amortized over weighted-average vesting period (in years)						1 year 3 months 18 days
Total unrecognized stock-based compensation expenses related to unvested RSUs/PSUs				56,900		$ 56,900
Special PSUs
Stock Based Compensation
Expected to be amortized over weighted-average vesting period (in years)						3 years 1 month 6 days
Number of quarterly installments \| installment	4
Total unrecognized stock-based compensation expenses related to unvested RSUs/PSUs				115,300		$ 115,300
Risk-free interest rate	0.85%
Expected stock price volatility	55.36%
Historical volatility rate, weight	50.00%
Implied volatility rate, weight	50.00%
Look back period	2 years 2 months 15 days
Special PSUs \| Chief Executive Officer
Stock Based Compensation
Granted (in shares) \| shares	540,000
Special PSUs \| Vesting one
Stock Based Compensation
Vesting percentage	50.00%
Special PSUs \| Vesting two
Stock Based Compensation
Vesting percentage	12.50%
Special PSUs \| Vesting three
Stock Based Compensation
Vesting percentage	12.50%
Special PSUs \| Vesting four
Stock Based Compensation
Vesting percentage	12.50%
Special PSUs \| Vesting five
Stock Based Compensation
Vesting percentage	12.50%
Employee Stock Purchase Plan
Stock Based Compensation
Threshold percentage of outstanding shares		1.00%
Offering period		24 months
Number of purchase periods \| purchasePeriod		4
Duration of purchase periods		6 months
Percentage of eligible compensation		15.00%
Maximum number of shares each participant can purchase during purchase period (in shares) \| shares		2,500
Purchase price, threshold percentage of fair market value		85.00%
Number of increases in contribution \| changeInContribution						1
Plan modification, incremental cost				1,100	$ 800	$ 5,400	$ 1,600
Employee payroll contributions accrued				$ 20,400		$ 20,400		$ 11,000
Employee Stock Purchase Plan \| Minimum
Stock Based Compensation
Risk-free interest rate						0.00%	0.20%
Expected stock price volatility						33.00%	30.10%
Employee Stock Purchase Plan \| Maximum
Stock Based Compensation
Risk-free interest rate						1.90%	2.00%
Expected stock price volatility						55.90%	54.30%
Class A common stock \| Employee Stock Purchase Plan
Stock Based Compensation
Maximum number of shares of common stock that may be issued (in shares) \| shares		3,500,000
2019 Plan \| Class A common stock
Stock Based Compensation
Maximum number of shares of common stock that may be issued (in shares) \| shares		8,750,000
Threshold percentage of outstanding shares		2.00%