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Goodwill and Other Intangible Assets - Future Estimated Amortization Expense Related to Amortizable Intangible Assets (Detail) - USD ($)
$ in Thousands
Apr. 30, 2018
Jan. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract]    
2019 $ 1,353  
2020 1,789  
2021 1,638  
2022 1,150  
2023 964  
Thereafter 4,590  
Net Carrying Amount $ 11,484 $ 8,015