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Intangible Assets - Summary of Estimated Future Amortization Expense of Software Licenses (Detail) - USD ($)
$ in Thousands
Oct. 31, 2018
Jan. 31, 2018
Finite Lived Intangible Assets [Line Items]    
Net Carrying Amount $ 11,222 $ 14,417
Internal-use software licenses [Member]    
Finite Lived Intangible Assets [Line Items]    
2019 1,151  
2020 4,599  
2021 1,372  
2022 0  
2023 0  
Thereafter 0  
Net Carrying Amount $ 7,122 $ 10,317