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Property and Equipment, Net (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended 12 Months Ended
Jul. 31, 2021
Jul. 31, 2020
Jul. 31, 2021
Jul. 31, 2020
Jan. 31, 2021
Property, Plant and Equipment [Line Items]          
Total property and equipment, gross $ 108,458   $ 108,458   $ 100,941
Less: accumulated depreciation (28,171)   (28,171)   (20,597)
Total property and equipment, net 80,287   80,287   $ 80,344
Depreciation expense 4,000 $ 3,000 $ 7,600 $ 4,900  
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 18,528   $ 18,528   $ 10,719
Office equipment          
Property, Plant and Equipment [Line Items]          
Total property and equipment, gross 17,853   17,853   14,856
Furniture and fixtures          
Property, Plant and Equipment [Line Items]          
Total property and equipment, gross 8,098   8,098   7,344
Leasehold improvements          
Property, Plant and Equipment [Line Items]          
Total property and equipment, gross 63,070   63,070   57,799
Construction in progress          
Property, Plant and Equipment [Line Items]          
Total property and equipment, gross 313   313   4,469
Software in progress          
Property, Plant and Equipment [Line Items]          
Total property and equipment, gross $ 596   $ 596   $ 5,754