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Intangible Assets - Summary of Expected Annual Amortization Expense Related to Software Licenses (Detail) - USD ($)
$ in Thousands
Jan. 31, 2019
Jan. 31, 2018
Finite Lived Intangible Assets [Line Items]    
Net Carrying Amount $ 10,936 $ 14,417
Internal-use software license [Member]    
Finite Lived Intangible Assets [Line Items]    
2020 4,906  
2021 1,669  
2022 261  
2023 0  
2024 0  
Thereafter 0  
Net Carrying Amount $ 6,836 $ 10,317