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Balance Sheet Components - Property and Equipment, Net (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jul. 31, 2019
Jul. 31, 2018
Jul. 31, 2019
Jul. 31, 2018
Jan. 31, 2019
Property and Equipment, Net          
Property, Plant and Equipment, Gross $ 144,825   $ 144,825   $ 100,423
Less: Accumulated depreciation and amortization (36,836)   (36,836)   (26,688)
Total property and equipment, net 107,989   107,989   73,735
Purchases     47,000    
Depreciation and amortization 5,300 $ 3,400 10,193 $ 6,424  
Data center and other computer equipment          
Property and Equipment, Net          
Property, Plant and Equipment, Gross 55,980   55,980   44,735
Capitalized internal-use software          
Property and Equipment, Net          
Property, Plant and Equipment, Gross 25,764   25,764   22,209
Leasehold improvements          
Property and Equipment, Net          
Property, Plant and Equipment, Gross 9,916   9,916   10,011
Purchased software          
Property and Equipment, Net          
Property, Plant and Equipment, Gross 1,757   1,757   1,460
Furniture And Equipment          
Property and Equipment, Net          
Property, Plant and Equipment, Gross 3,417   3,417   2,553
Construction in process          
Property and Equipment, Net          
Property, Plant and Equipment, Gross $ 47,991   $ 47,991   $ 19,455