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Goodwill and Intangible Assets, net - Narrative (Details) - USD ($)
 3 Months Ended 6 Months Ended 12 Months Ended
Jul. 31, 2018
Jul. 31, 2017
Jul. 31, 2018
Jul. 31, 2017
Jan. 31, 2018
Jan. 31, 2017
Jul. 13, 2018
Goodwill and Intangible Assets Disclosure [Abstract]              
Goodwill $ 18,095,000   $ 18,095,000   $ 6,282,000 [1]    
Goodwill impairments 0 $ 0 0 $ 0      
Capitalized internal-use software 800,000 1,900,000 2,000,000 3,300,000      
Stock-based compensation included in capitalized software costs 100,000 400,000 $ 300,000 $ 600,000      
Finite-Lived Intangible Assets [Line Items]              
Amortization expense $ 1,200,000 $ 700,000     $ 2,400,000 $ 1,400,000  
ScaleFT, Inc.              
Goodwill and Intangible Assets Disclosure [Abstract]              
Goodwill             $ 11,800,000
Finite-Lived Intangible Assets [Line Items]              
Purchased developed technology             4,600,000
ScaleFT, Inc. | Purchased developed technology              
Finite-Lived Intangible Assets [Line Items]              
Purchased developed technology             $ 4,600,000
[1] See Note 2 for a summary of adjustments.