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Goodwill and Other Intangible Assets - Future Estimated Amortization Expense Related to Amortizable Intangible Assets (Detail) (USD $)
In Thousands, unless otherwise specified
Apr. 30, 2015
Jan. 31, 2015
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]    
2016 $ 1,332us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseRemainderOfFiscalYear  
2017 1,694us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo  
2018 1,673us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree  
2019 1,359us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour  
2020 1,331us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive  
2021 and thereafter 3,327us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFive  
Net Carrying Amount $ 10,716us-gaap_FiniteLivedIntangibleAssetsNet $ 10,831us-gaap_FiniteLivedIntangibleAssetsNet