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Summary of Significant Accounting Policies - Concentration Risk Revenue (Details) - Revenue Benchmark - Customer Concentration Risk
3 Months Ended 6 Months Ended
Jul. 31, 2021
Jul. 31, 2020
Jul. 31, 2021
Jul. 31, 2020
Channel partner A        
Concentration Risk [Line Items]        
Percentage of Revenue 19.00% 19.00% 18.00% 19.00%
Channel partner B        
Concentration Risk [Line Items]        
Percentage of Revenue   13.00%   13.00%