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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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Stock-Based Compensation - Narrative (Details) $ / shares in Units, $ in Thousands	1 Months Ended		12 Months Ended
	May 31, 2019 purchasePeriod shares	Sep. 30, 2018 installment tranche	Jan. 31, 2022 USD ($) installment changeInContribution $ / shares shares	Jan. 31, 2021 USD ($) $ / shares shares	Jan. 31, 2020 USD ($) $ / shares	May 31, 2021 shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Maximum number of additional shares of common stock that may be issued (in shares) \| shares						5,000,000
Accrued payroll and benefits			$ 104,563	$ 71,907
Shares of common stock issuable from stock options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options exercisable (in shares) \| shares			362,406
Options, aggregate intrinsic value			$ 480,500	$ 711,400	$ 469,600
Options exercisable, weighted average contractual term			5 years 8 months 12 days	6 years 4 months 24 days	6 years 8 months 12 days
Weighted average grant date fair value (in usd per share) \| $ / shares			$ 180.08	$ 66.31	$ 9.51
Options exercised, intrinsic value			$ 570,900	$ 847,500	$ 407,900
Options outstanding, intrinsic value			$ 678,000	$ 1,400,000	$ 816,300
Options outstanding, weighted average remaining contractual term			6 years 1 month 6 days	7 years	7 years 4 months 24 days
Total unrecognized stock-based compensation expense, unvested options			$ 16,600	$ 24,300
Expected amortization period, weighted average vesting period			1 year 4 months 24 days	1 year 8 months 12 days
Common stock shares issued, early exercised stock options \| shares			0	0
Number of shares of common stock related to early exercised stock options subject to repurchase (in shares) \| shares			197,994	548,028
Value of common stock related to early exercised stock options subject to repurchase			$ 2,200	$ 5,400
Shares of common stock issuable from stock options \| Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Risk-free interest rate			0.60%	0.20%	2.00%
Expected stock price volatility			36.10%	35.80%	37.70%
Shares of common stock issuable from stock options \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Risk-free interest rate			1.00%	0.40%	2.40%
Expected stock price volatility			37.10%	37.30%	37.90%
RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of vesting schedules \| tranche		4
RSUs \| Tranche One
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of quarterly installments \| installment		12
Vesting percentage		10.00%	25.00%
RSUs \| Tranche Two
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of quarterly installments \| installment		16
Vesting percentage		15.00%
RSUs \| Tranche Three
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of quarterly installments \| installment		8
Vesting percentage		25.00%
RSUs \| Tranche Four
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage		50.00%
Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected amortization period, weighted average vesting period			2 years 3 months 18 days	2 years 7 months 6 days
Unrecognized stock based compensation expense, unvested RSUs			$ 702,300	$ 393,900
PSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected amortization period, weighted average vesting period			1 year 2 months 12 days	1 year 3 months 18 days
Unrecognized stock based compensation expense, unvested RSUs			$ 42,900	$ 24,800
Special Performance-based Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected amortization period, weighted average vesting period			2 years 9 months 18 days
Number of quarterly installments \| installment			4
Unrecognized stock based compensation expense, unvested RSUs			$ 118,400
Historical volatility rate, weight			50.00%
Historical volatility rate, weight			50.00%
Special Performance-based Stock Units \| Executive Officer
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares) \| shares			655,000
Special Performance-based Stock Units \| Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Risk-free interest rate			0.85%
Expected stock price volatility			54.89%
Look back period			2 years 2 months 15 days
Special Performance-based Stock Units \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Risk-free interest rate			1.51%
Expected stock price volatility			55.36%
Look back period			2 years 6 months 29 days
Special Performance-based Stock Units \| Tranche One
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage			50.00%
Special Performance-based Stock Units \| Tranche Two
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage			12.50%
Special Performance-based Stock Units \| Tranche Three
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage			12.50%
Special Performance-based Stock Units \| Tranche Four
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage			12.50%
Special Performance-based Stock Units \| Tranche Five
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage			12.50%
Share purchase rights under the employee stock purchase plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Threshold percentage, outstanding shares	100.00%
Number of increases in contribution \| changeInContribution			1
Equity Incentive Plan 2019 \| Common Class A
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares authorized (in shares) \| shares	8,750,000
Threshold percentage, outstanding shares	2.00%
Employee Stock Purchase Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Threshold percentage, outstanding shares	1.00%
ESPP, consecutive offering period	24 months
ESPP, number of purchase periods \| purchasePeriod	4
ESPP, purchase period duration	6 months
ESPP, percentage of eligible compensation	15.00%
Maximum number of shares purchasable (in shares) \| shares	2,500
Purchase price of common stock, percentage	85.00%
Plan modification, incremental cost			$ 6,200	3,500
Accrued payroll and benefits			$ 14,800	$ 11,000
Employee Stock Purchase Plan \| Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Risk-free interest rate			0.00%	0.10%	1.60%
Expected stock price volatility			33.00%	30.10%	30.10%
Employee Stock Purchase Plan \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Risk-free interest rate			1.90%	2.00%	2.20%
Expected stock price volatility			55.90%	54.30%	35.70%
Employee Stock Purchase Plan \| Common Class A
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares authorized (in shares) \| shares	3,500,000