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Revenue and Performance Obligations - Additional Information (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jul. 31, 2019
Jul. 31, 2018
Jul. 31, 2019
Jul. 31, 2018
Disaggregation of Revenue [Line Items]        
Remaining performance obligations $ 628.6   $ 628.6  
Subscription | Minimum        
Disaggregation of Revenue [Line Items]        
Contract term     1 year  
Subscription | Maximum        
Disaggregation of Revenue [Line Items]        
Contract term     3 years  
Product concentration risk | Revenue | Subscription        
Disaggregation of Revenue [Line Items]        
Concentration risk percentage 94.00% 95.00% 94.00% 95.00%