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Intangible Assets - Estimated Amortization Expense (Detail) - USD ($)
$ in Thousands
Jul. 31, 2017
Jan. 31, 2017
Finite Lived Intangible Assets Future Amortization Expense Current And Five Succeeding Fiscal Years [Abstract]    
Fiscal 2018 $ 3,800  
Fiscal 2019 6,966  
Fiscal 2020 6,062  
Fiscal 2021 3,629  
Fiscal 2022 3,182  
Thereafter 11,649  
Intangible assets, Net $ 35,288 $ 39,283