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

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

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Stock-Based Compensation - Additional Information (Details) $ / shares in Units, $ in Thousands	1 Months Ended		3 Months Ended		12 Months Ended
	May 31, 2019 purchasePeriod shares	Sep. 30, 2018 installment tranche	Apr. 30, 2021 USD ($) changeInContribution $ / shares shares	Apr. 30, 2020 USD ($) shares	Jan. 31, 2021 USD ($) shares
Stock Based Compensation
Options granted (in shares) \| shares			93,000	0
Options unvested (in shares) \| shares			409,281
Aggregate intrinsic value of options vested and exercisable			$ 655,900		$ 711,400
Weighted-average remaining contractual term of options vested and exercisable (in years)			6 years 3 months 18 days		6 years 4 months 24 days
Weighted-average grant date fair value of options granted (in usd per share) \| $ / shares			$ 180.08
Total intrinsic value of options exercised			$ 154,400	$ 111,200
Aggregate intrinsic value of stock options outstanding			$ 1,200,000		$ 1,400,000
Weighted-average remaining contractual term of stock options outstanding (in years)			6 years 9 months 18 days		7 years
Total unrecognized stock-based compensation expenses related to unvested options			$ 30,600		$ 24,300
Number of shares of common stock related to early exercised stock options subject to repurchase (in shares) \| shares			458,280		548,028
Value of common stock related to early exercised stock options subject to repurchase			$ 4,600		$ 5,400
Employee payroll contributions accrued			$ 79,099		71,907
Common Stock
Stock Based Compensation
Issuance of common stock upon exercise of options (in shares) \| shares			0	0
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%
Service-based vesting
Stock Based Compensation
Number of vesting schedules \| tranche		3
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			$ 2,500
Employee payroll contributions accrued			$ 24,300		$ 11,000
Employee Stock Purchase Plan \| Class A common stock
Stock Based Compensation
Maximum number of shares of common stock that may be issued (in shares) \| shares	3,500,000
Stock options
Stock Based Compensation
Expected to be amortized over weighted-average vesting period (in years)			1 year 7 months 6 days		1 year 8 months 12 days
RSUs
Stock Based Compensation
Expected to be amortized over weighted-average vesting period (in years)			2 years 6 months
Total unrecognized stock-based compensation expenses related to unvested RSUs			$ 496,400
PSUs
Stock Based Compensation
Expected to be amortized over weighted-average vesting period (in years)			1 year 8 months 12 days
Total unrecognized stock-based compensation expenses related to unvested RSUs			$ 89,200
Vesting one \| Service-based vesting
Stock Based Compensation
Vesting percentage			25.00%
Number of quarterly installments \| installment		12
Vesting two \| Service-based vesting
Stock Based Compensation
Number of quarterly installments \| installment		16
Vesting three \| Service-based vesting
Stock Based Compensation
Number of quarterly installments \| installment		8