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Revenue and Performance Obligations (Details) - USD ($)
$ in Millions
12 Months Ended
Jan. 31, 2020
Jan. 31, 2019
Jan. 31, 2018
Disaggregation of Revenue [Line Items]      
Remaining performance obligations $ 768.7    
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2020-02-01      
Disaggregation of Revenue [Line Items]      
Remaining performance obligation, percentage 53.00%    
Remaining performance obligations, period of recognition 12 months    
Product concentration risk | Revenue | Subscription      
Disaggregation of Revenue [Line Items]      
Concentration risk percentage 94.00% 95.00% 93.00%