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Intangible Assets - Estimated Amortization Expense (Detail) - USD ($)
$ in Thousands
Jul. 31, 2019
Jan. 31, 2019
Intangible Assets, Net (Excluding Goodwill) [Abstract]    
Remaining for Fiscal 2020 $ 2,979  
Fiscal 2021 3,629  
Fiscal 2022 3,182  
Fiscal 2023 3,182  
Fiscal 2024 3,182  
Thereafter 5,284  
Net $ 21,438 $ 24,521