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Stock-Based Compensation (Details) $ / shares in Units, $ in Thousands	1 Months Ended			12 Months Ended
	May 31, 2019 purchasePeriod shares	Oct. 31, 2018 USD ($) $ / shares shares	Sep. 30, 2018 tranche installment	Jan. 31, 2021 USD ($) installment $ / shares shares	Jan. 31, 2020 USD ($) $ / shares shares	Jan. 31, 2019 USD ($) $ / shares	Jun. 14, 2019 USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation expense				$ 149,675	$ 79,940	$ 20,505
Accrued payroll and benefits				$ 71,907	36,810
Shares of common stock issuable from stock options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options exercisable (in shares) \| shares				424,906
Options, aggregate intrinsic value				$ 711,400	$ 469,600	$ 181,100
Options exercisable, weighted average contractual term				6 years 4 months 24 days	6 years 8 months 12 days	7 years 1 month 6 days
Weighted average grant date fair value (in usd per share) \| $ / shares				$ 66.31	$ 9.51	$ 5.70
Options exercised, intrinsic value				$ 847,500	$ 407,900	$ 26,900
Options outstanding, intrinsic value				$ 1,400,000	$ 816,300	$ 286,100
Options outstanding, weighted average remaining contractual term				7 years	7 years 4 months 24 days	7 years 10 months 24 days
Total unrecognized stock-based compensation expense, unvested options				$ 24,300	$ 34,700
Expected amortization period, weighted average vesting period				1 year 8 months 12 days	2 years 1 month 6 days
Common stock shares issued, early exercised stock options \| shares				0	1,037,356
Stock issued during period, early exercise of employee options, Value					$ 10,300
Number of shares of common stock related to early exercised stock options subject to repurchase (in shares) \| shares				548,028	984,417
Value of common stock related to early exercised stock options subject to repurchase				$ 5,400	$ 8,700
RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of vesting schedules			3	3
RSUs \| Tranche One
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage			25.00%
Number of quarterly installments \| installment			12	12
RSUs \| Tranche Two
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of quarterly installments \| installment			16	16
RSUs \| Tranche Three
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of quarterly installments \| installment			8	8
Performance Based RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Deferred compensation expense							$ 17,300
Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected amortization period, weighted average vesting period				2 years 7 months 6 days	2 years 6 months
Unrecognized stock based compensation expense, unvested RSUs				$ 393,900	$ 139,400
PSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected amortization period, weighted average vesting period				1 year 3 months 18 days	1 year 7 months 6 days
Unrecognized stock based compensation expense, unvested RSUs				$ 24,800	$ 2,700
PSUs \| Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Threshold percentage, outstanding shares				0.00%
PSUs \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Threshold percentage, outstanding shares				130.00%
Series E Redeemable Convertible Preferred Stock \| Tender Offer Transaction
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Sale of stock, shares issued (in shares) \| shares		2,400,000
Sale of stock, price per share (in usd per share) \| $ / shares		$ 15.64
Sale of stock, aggregate purchase price		$ 37,600
Total stock-based compensation expense		$ 10,800
Equity Incentive Plan 2019 \| Class A Common Stock
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				$ 3,500
Accrued payroll and benefits				$ 11,000	$ 6,600
Employee Stock Purchase Plan \| Class A Common Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares authorized (in shares) \| shares	3,500,000