Income Taxes - Schedule of Components of Loss Before Income Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
	Jan. 31, 2021	Jan. 31, 2020	Jan. 31, 2019
Income Tax Disclosure [Abstract]
U.S.	$ (544,700)	$ (351,100)	$ (178,732)
Foreign	7,660	3,558	1,524
Loss before income taxes	$ (537,040)	$ (347,542)	$ (177,208)