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Stock-Based Compensation (Details) $ / shares in Units, $ in Thousands	1 Months Ended				3 Months Ended	12 Months Ended
	May 31, 2019 unit_Standard_item shares	Oct. 31, 2018 USD ($) $ / shares shares	Sep. 30, 2018 unit_Standard_installment unit_Standard_tranche	Oct. 31, 2017 USD ($) $ / shares shares	Jan. 31, 2020 USD ($) shares	Jan. 31, 2020 USD ($) unit_Standard_installment $ / shares shares	Jan. 31, 2019 USD ($) $ / shares shares	Jan. 31, 2018 USD ($) $ / shares	Jun. 14, 2019 USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation expense						$ 79,940	$ 20,505	$ 12,343
Vesting period						4 years
Accrued payroll and benefits					$ 36,810	$ 36,810	19,284
Stock-based compensation expense						$ 79,940	20,505	12,343
Shares of common stock issuable from stock options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options exercisable \| shares					857,201	857,201
Options, aggregate intrinsic value					$ 469,600	$ 469,600	$ 181,100	$ 17,900
Options exercisable, weighted average contractual term						6 years 8 months 12 days	7 years 1 month 6 days	6 years 7 months 6 days
Weighted average grant date fair value (in usd per share) \| $ / shares						$ 9.51	$ 5.70	$ 0.90
Options exercised, intrinsic value						$ 407,900	$ 26,900	$ 4,000
Options outstanding, intrinsic value					816,300	$ 816,300	$ 286,100	$ 26,100
Options outstanding, weighted average remaining contractual term						7 years 4 months 24 days	7 years 10 months 24 days	8 years
Total unrecognized stock-based compensation expense, unvested options					$ 34,700	$ 34,700	$ 45,800
Expected amortization period, weighted average vesting period						2 years 1 month 6 days	3 years 4 months 24 days
Common stock shares issued, early exercised stock options \| shares						1,037,356	37,605
Stock issued during period, early exercise of employee options, Value						$ 10,300	$ 74
Number of shares of common stock related to early exercised stock options subject to repurchase (in shares) \| shares					984,417	984,417	545,941
Value of common stock related to early exercised stock options subject to repurchase					$ 8,700	$ 8,700	$ 1,200
RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of vesting schedules			3			3
Vesting period						4 years
RSUs \| Tranche One
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of quarterly installments \| unit_Standard_installment			12			12
Vesting percentage			25.00%
RSUs \| Tranche Two
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of quarterly installments \| unit_Standard_installment			16			16
RSUs \| Tranche Three
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of quarterly installments \| unit_Standard_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 6 months	2 years 2 months 12 days
Unrecognized stock based compensation expense, unvested RSUs					$ 139,400	$ 139,400	$ 51,900
PSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected amortization period, weighted average vesting period					1 year 7 months 6 days
Unrecognized stock based compensation expense, unvested RSUs					$ 2,700	$ 2,700
Vesting period						4 years
Series D-1 \| Secondary Stock Sale
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Sale of stock, shares issued (in shares) \| shares				3,300,000
Sale of stock, aggregate purchase price				$ 17,500
Total stock-based compensation expense				8,800
Stock-based compensation expense				$ 8,800
Series D-1 \| Minimum \| Secondary Stock Sale
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Sale of stock, price per share (in usd per share) \| $ / shares				$ 5.12
Series D-1 \| Maximum \| Secondary Stock Sale
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Sale of stock, price per share (in usd per share) \| $ / shares				$ 5.69
Series E \| 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
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%
Total stock-based compensation expense					10,300
ESPP, number of purchase periods \| unit_Standard_item	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%
Accrued payroll and benefits					6,600	$ 6,600
Stock-based compensation expense					$ 10,300
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