Revenue Recognition - Summary Disaggregation of Revenue by Region (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Jan. 31, 2021	Oct. 31, 2020	Jul. 31, 2020	Apr. 30, 2020	Jan. 31, 2020	Oct. 31, 2019	Jul. 31, 2019	Apr. 30, 2019	Jan. 31, 2021	Jan. 31, 2020	Jan. 31, 2019
Disaggregation of Revenue [Line Items]
Revenue	$ 882,485	$ 777,196	$ 663,520	$ 328,167	$ 188,251	$ 166,593	$ 145,826	$ 121,988	$ 2,651,368	$ 622,658	$ 330,517
Revenue from Contract with Customer | Geographic Concentration Risk
Disaggregation of Revenue [Line Items]
Percentage of Revenue									100.00%	100.00%	100.00%
Americas
Disaggregation of Revenue [Line Items]
Revenue									$ 1,831,694	$ 500,622	$ 270,132
Americas | Revenue from Contract with Customer | Geographic Concentration Risk
Disaggregation of Revenue [Line Items]
Percentage of Revenue									69.00%	81.00%	82.00%
APAC
Disaggregation of Revenue [Line Items]
Revenue									$ 332,844	$ 51,152	$ 27,720
APAC | Revenue from Contract with Customer | Geographic Concentration Risk
Disaggregation of Revenue [Line Items]
Percentage of Revenue									13.00%	8.00%	8.00%
EMEA
Disaggregation of Revenue [Line Items]
Revenue									$ 486,830	$ 70,884	$ 32,665
EMEA | Revenue from Contract with Customer | Geographic Concentration Risk
Disaggregation of Revenue [Line Items]
Percentage of Revenue									18.00%	11.00%	10.00%