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Represents the number of purchase periods under ESPP.

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Number of quarterly installments for share based payment awards.

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Share-based Payment Arrangement, Plan Modification, Number of Contribution Changes

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Number of shares of common stock related to early exercised stock options subject to repurchase.

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Value of common stock related to early exercised stock options subject to repurchase.

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Number of early share options (or share units) exercised during the current period.

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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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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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Gross number of share options (or share units) granted during the period.

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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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Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.

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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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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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Percentage of vesting of award under share-based payment arrangement.

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Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable.

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Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Number of non-vested options outstanding.

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Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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

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Stock-Based Compensation - Additional Information (Details) $ / shares in Units, $ in Thousands	1 Months Ended		3 Months Ended		6 Months Ended		12 Months Ended
	May 31, 2019 purchasePeriod shares	Sep. 30, 2018 installment tranche	Jul. 31, 2021 USD ($) shares	Jul. 31, 2020 USD ($) $ / shares shares	Jul. 31, 2021 USD ($) changeInContribution $ / shares shares	Jul. 31, 2020 USD ($) $ / shares	Jan. 31, 2021 USD ($) shares	May 31, 2021 shares
Stock Based Compensation
Maximum number of additional shares of common stock that may be issued (in shares) \| shares								5,000,000
Options unvested (in shares) \| shares			393,656		393,656
Aggregate intrinsic value of options vested and exercisable			$ 695,400		$ 695,400		$ 711,400
Weighted-average remaining contractual term of options vested and exercisable (in years)					6 years 2 months 12 days		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				$ 32.91	$ 180.08	$ 32.91
Total intrinsic value of options exercised			$ 234,000	$ 242,800	$ 388,400	$ 354,000
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 7 months 6 days		7 years
Total unrecognized stock-based compensation expenses related to unvested options			$ 23,000		$ 23,000		$ 24,300
Issuance of common stock upon exercise of options (in shares) \| shares			0	0
Number of shares of common stock related to early exercised stock options subject to repurchase (in shares) \| shares			368,532		368,532		548,028
Value of common stock related to early exercised stock options subject to repurchase			$ 3,800		$ 3,800		$ 5,400
Employee payroll contributions accrued			95,462		$ 95,462		$ 71,907
Stock options
Stock Based Compensation
Expected to be amortized over weighted-average vesting period (in years)					1 year 6 months		1 year 8 months 12 days
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			557,700		$ 557,700
PSUs
Stock Based Compensation
Expected to be amortized over weighted-average vesting period (in years)					1 year 6 months
Total unrecognized stock-based compensation expenses related to unvested RSUs/PSUs			71,600		$ 71,600
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			1,800	$ 800	$ 4,300	$ 800
Employee payroll contributions accrued			$ 8,700		$ 8,700		$ 11,000
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%