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Goodwill and Intangible Assets, net Narrative (Details) - USD ($)
 12 Months Ended
Jan. 31, 2020
Jan. 31, 2019
Jan. 31, 2018
Mar. 18, 2019
Goodwill [Line Items]        
Goodwill $ 48,023,000 $ 18,089,000 [1]    
Goodwill impairments 0 0 $ 0  
Stock-based compensation included in capitalized software costs 1,200,000 500,000    
Amortization expense 10,600,000 5,800,000 2,900,000  
Company wrote-off an immaterial amount 119,000 $ 0 [2] 1,114,000 [2]  
Purchased developed technology $ 24,200,000      
Weighted average useful life 3 years 10 months 24 days 2 years 6 months    
Capitalized internal-use software costs        
Goodwill [Line Items]        
Capitalized internal-use software $ 5,100,000 $ 3,400,000    
Amortization expense 4,900,000 4,800,000 $ 2,700,000  
Company wrote-off an immaterial amount 119,000 0    
Purchased developed technology        
Goodwill [Line Items]        
Company wrote-off an immaterial amount 0 $ 0    
Finite-lived Intangible Assets Acquired 8,500,000      
Azuqua, Inc.        
Goodwill [Line Items]        
Goodwill       $ 29,900,000
Goodwill recorded in connection with Azuqua acquisition 29,934,000      
Purchased developed technology $ 15,700,000      
Azuqua, Inc. | Purchased developed technology        
Goodwill [Line Items]        
Purchased developed technology       $ 15,700,000
[1] Adjusted for adoption of ASC 842. See Note 2.
[2] Adjusted for adoption of ASC 842. See Note 2.