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Business Combinations - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended 12 Months Ended
Mar. 18, 2019
Jul. 13, 2018
Apr. 30, 2019
Jul. 31, 2018
Jan. 31, 2020
Jan. 31, 2019
Jan. 31, 2018
[1]
Business Acquisition [Line Items]              
Payments for business acquisition, net of cash acquired         $ 44,283 $ 15,632 [1] $ 0
Purchased developed technology         24,200    
Goodwill         48,023 $ 18,089 [2]  
Azuqua, Inc.              
Business Acquisition [Line Items]              
Payments for business acquisition, net of cash acquired $ 44,200            
Cash received from acquisition 1,100            
Purchased developed technology         15,700    
Goodwill 29,900            
Acquisition related costs     $ 3,000        
Azuqua, Inc. | Purchased developed technology              
Business Acquisition [Line Items]              
Purchased developed technology $ 15,700            
ScaleFT, Inc.              
Business Acquisition [Line Items]              
Payments for business acquisition, net of cash acquired   $ 15,600          
Cash received from acquisition   600          
Goodwill   11,800          
Acquisition related costs       $ 1,100      
ScaleFT, Inc. | Purchased developed technology              
Business Acquisition [Line Items]              
Purchased developed technology   $ 4,600          
ScaleFT, Inc And Azuqua, Inc. [Member]              
Business Acquisition [Line Items]              
Deferred compensation liability, noncurrent         10,800    
Compensation expense         4,400    
Remaining deferred compensation balance         $ 4,800    
Future weighted-average period         1 year 7 months 6 days    
[1] Adjusted for adoption of ASC 842. See Note 2.
[2] Adjusted for adoption of ASC 842. See Note 2.