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Goodwill and Other Intangible Assets - Future Estimated Amortization Expense Related to Amortizable Intangible Assets (Detail) - USD ($)
$ in Thousands
Jul. 31, 2018
Jan. 31, 2018
For fiscal years ending January 31 (in thousands):    
2019 $ 902  
2020 1,783  
2021 1,636  
2022 1,150  
2023 964  
2024 and thereafter 4,602  
Net Carrying Amount $ 11,037 $ 8,015