Revenue Recognition - Summary Disaggregation of Revenue by Region (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 31, 2020	Oct. 31, 2019	Oct. 31, 2020	Oct. 31, 2019
Disaggregation of Revenue [Line Items]
Revenue	$ 777,196	$ 166,593	$ 1,768,883	$ 434,407
Percentage of revenue	100.00%	100.00%	100.00%	100.00%
Americas
Disaggregation of Revenue [Line Items]
Revenue	$ 538,504	$ 133,864	$ 1,238,298	$ 349,122
Percentage of revenue	69.00%	81.00%	70.00%	81.00%
Asia Pacific (“APAC”)
Disaggregation of Revenue [Line Items]
Revenue	$ 103,458	$ 13,661	$ 215,099	$ 36,189
Percentage of revenue	13.00%	8.00%	12.00%	8.00%
Europe, Middle East, and Africa (“EMEA”)
Disaggregation of Revenue [Line Items]
Revenue	$ 135,234	$ 19,068	$ 315,486	$ 49,096
Percentage of revenue	18.00%	11.00%	18.00%	11.00%