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Intangible Assets - Estimated Amortization Expense (Detail) - USD ($)
$ in Thousands
Apr. 30, 2018
Jan. 31, 2018
[1]
Finite Lived Intangible Assets Future Amortization Expense Current And Five Succeeding Fiscal Years [Abstract]    
Fiscal 2019 $ 5,122  
Fiscal 2020 6,062  
Fiscal 2021 3,629  
Fiscal 2022 3,182  
Fiscal 2023 3,182  
Thereafter 8,467  
Intangible assets, Net $ 29,644 $ 31,490
[1] See note 1 of the notes to the condensed consolidated financial statements for a summary of adjustments.