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Business Combinations - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 18, 2019
Apr. 30, 2020
Apr. 30, 2019
Jan. 31, 2020
Business Acquisition [Line Items]        
Payments for business acquisition, net of cash acquired   $ 0 $ 44,223  
Goodwill   48,023   $ 48,023
Compensation expense   1,200    
Azuqua, Inc.        
Business Acquisition [Line Items]        
Payments for business acquisition, net of cash acquired $ 44,200      
Cash acquired from acquisition 1,100      
Goodwill 29,900      
Acquisition related costs     $ 3,000  
Azuqua, Inc. | Purchased developed technology        
Business Acquisition [Line Items]        
Purchased developed technology $ 15,700      
Useful life of acquired intangible assets 5 years      
Azuqua and Prior Acquisitions        
Business Acquisition [Line Items]        
Deferred compensation liability   10,800    
Remaining balance of noncurrent deferred compensation liability   $ 3,600    
Period of recognition of deferred compensation   1 year 7 months 6 days