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Goodwill and Other Intangible Assets - Future Estimated Amortization Expense Related to Amortizable Intangible Assets (Detail) - USD ($)
$ in Thousands
Jul. 31, 2015
Jan. 31, 2015
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]    
2016 $ 838  
2017 1,637  
2018 1,644  
2019 1,299  
2020 1,299  
2021 and thereafter 3,258  
Net Carrying Amount $ 9,975 $ 10,831