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Income Taxes (Details)
3 Months Ended
Apr. 30, 2015
Apr. 30, 2014
Income Tax Disclosure [Abstract]    
Effective Income Tax Rate Reconciliation, Tax Settlement, Percent 35.20%us-gaap_EffectiveIncomeTaxRateReconciliationTaxSettlements 36.50%us-gaap_EffectiveIncomeTaxRateReconciliationTaxSettlements