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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
Jan. 31, 2015
Jan. 31, 2014
Jan. 31, 2013
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]      
2016 $ 1,687us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths    
2017 1,646us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo    
2018 1,626us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree    
2019 1,327us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour    
2020 1,300us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive    
Thereafter 3,245us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFive    
Net Carrying Amount $ 10,831us-gaap_FiniteLivedIntangibleAssetsNet $ 3,201us-gaap_FiniteLivedIntangibleAssetsNet $ 3,989us-gaap_FiniteLivedIntangibleAssetsNet