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Equity - Valuation Assumptions (Details)
3 Months Ended
Apr. 30, 2021
Apr. 30, 2020
Stock options    
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology    
Expected term (in years)   6 years
Expected volatility   36.60%
Risk-free interest rate   1.30%
Expected dividend yield   0.00%
ESPP    
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology    
Expected term (in years) 6 months  
Expected volatility 49.50%  
Risk-free interest rate 0.10%  
Expected dividend yield 0.00%