Significant Accounting Policies - Recent Accounting Guidance (Details) - USD ($) $ in Thousands	Feb. 01, 2022	Jan. 31, 2022	Jan. 31, 2021	Jan. 31, 2020	Jan. 31, 2019
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Stockholders equity		$ 893,578	$ 1,040,231	$ 445,657	$ 313,281
Additional Paid-In Capital
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Stockholders equity		1,778,840	1,556,865	790,468	567,797
Accumulated Deficit
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Stockholders equity		$ (894,912)	$ (525,806)	$ (345,689)	$ (254,857)
Cumulative Effect, Period of Adoption, Adjustment | Forecast
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Convertible senior notes	$ 541,900
Deferred tax liabilities	(4,800)
Cumulative Effect, Period of Adoption, Adjustment | Forecast | Additional Paid-In Capital
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Stockholders equity	(738,900)
Cumulative Effect, Period of Adoption, Adjustment | Forecast | Accumulated Deficit
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Stockholders equity	$ (201,800)