Revenue Recognition - Summary Disaggregation of Revenue by Region (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 31, 2020	Jul. 31, 2019	Jul. 31, 2020	Jul. 31, 2019
Disaggregation of Revenue [Line Items]
Revenue	$ 663,520	$ 145,826	$ 991,687	$ 267,814
Percentage of revenue	100.00%	100.00%	100.00%	100.00%
Americas
Disaggregation of Revenue [Line Items]
Revenue	$ 454,160	$ 117,098	$ 699,793	$ 215,258
Percentage of revenue	69.00%	80.00%	71.00%	80.00%
Asia Pacific (“APAC”)
Disaggregation of Revenue [Line Items]
Revenue	$ 81,384	$ 12,088	$ 111,641	$ 22,529
Percentage of revenue	12.00%	8.00%	11.00%	9.00%
Europe, Middle East, and Africa (“EMEA”)
Disaggregation of Revenue [Line Items]
Revenue	$ 127,976	$ 16,640	$ 180,253	$ 30,027
Percentage of revenue	19.00%	12.00%	18.00%	11.00%