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Property and Equipment, Net (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Oct. 31, 2021
Oct. 31, 2020
Oct. 31, 2021
Oct. 31, 2020
Jan. 31, 2021
Property, Plant and Equipment [Line Items]          
Total property and equipment, gross $ 109,588   $ 109,588   $ 100,941
Less: accumulated depreciation (32,486)   (32,486)   (20,597)
Total property and equipment, net 77,102   77,102   $ 80,344
Depreciation expense 4,400 $ 2,200 $ 12,000 $ 7,100  
Geographic Concentration Risk | UNITED STATES | Property, Plant and Equipment          
Property, Plant and Equipment [Line Items]          
Concentration risk, percentage     90.00%   88.00%
Computer software          
Property, Plant and Equipment [Line Items]          
Total property and equipment, gross 18,529   $ 18,529   $ 10,719
Office equipment          
Property, Plant and Equipment [Line Items]          
Total property and equipment, gross 18,721   18,721   14,856
Furniture and fixtures          
Property, Plant and Equipment [Line Items]          
Total property and equipment, gross 8,066   8,066   7,344
Leasehold improvements          
Property, Plant and Equipment [Line Items]          
Total property and equipment, gross 62,893   62,893   57,799
Construction in progress          
Property, Plant and Equipment [Line Items]          
Total property and equipment, gross 245   245   4,469
Software in progress          
Property, Plant and Equipment [Line Items]          
Total property and equipment, gross $ 1,134   $ 1,134   $ 5,754