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Intangible Assets - Estimated Amortization Expense (Detail) - USD ($)
$ in Thousands
Apr. 30, 2016
Jan. 31, 2016
Finite Lived Intangible Assets Future Amortization Expense Current And Five Succeeding Fiscal Years [Abstract]    
Fiscal 2017 $ 6,172  
Fiscal 2018 7,791  
Fiscal 2019 6,963  
Fiscal 2020 6,062  
Fiscal 2021 3,628  
Thereafter 14,830  
Intangible assets, Net Carrying Amount $ 45,446 $ 47,500