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Goodwill and Other Intangible Assets - Future Estimated Amortization Expense Related to Amortizable Intangible Assets (Detail) - USD ($)
$ in Thousands
Jan. 31, 2018
Jan. 31, 2017
Jan. 31, 2016
Goodwill and Intangible Assets Disclosure [Abstract]      
2019 $ 1,508    
2020 1,508    
2021 1,355    
2022 820    
2023 726    
Thereafter 2,098    
Net Carrying Amount $ 8,015 $ 9,012 $ 10,466