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Intangible Assets - Summary of Estimated Future Amortization Expense of Software Licenses (Detail) - USD ($)
$ in Thousands
Jul. 31, 2018
Jan. 31, 2018
Finite Lived Intangible Assets [Line Items]    
Net Carrying Amount $ 12,366 $ 14,417
Internal-use software licenses [Member]    
Finite Lived Intangible Assets [Line Items]    
2019 2,301  
2020 4,594  
2021 1,371  
2022 0  
2023 0  
Thereafter 0  
Net Carrying Amount $ 8,266 $ 10,317