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Goodwill and Other Intangible Assets - Future Estimated Amortization Expense Related to Amortizable Intangible Assets (Detail) - USD ($)
$ in Thousands
Apr. 30, 2016
Jan. 31, 2016
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]    
2017 $ 1,178  
2018 1,480  
2019 1,480  
2020 1,480  
2021 1,327  
2022 and thereafter 3,556  
Net Carrying Amount $ 10,501 $ 10,466