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Goodwill and Other Intangible Assets - Future Estimated Amortization Expense Related to Amortizable Intangible Assets (Detail) - USD ($)
$ in Thousands
Jan. 31, 2017
Jan. 31, 2016
Jan. 31, 2015
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]      
2018 $ 1,417    
2019 1,417    
2020 1,417    
2021 1,273    
2022 815    
Thereafter 2,673    
Net Carrying Amount $ 9,012 $ 10,466 $ 10,831