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Income Taxes (Details)
3 Months Ended 9 Months Ended
Oct. 31, 2013
Oct. 31, 2012
Oct. 31, 2013
Oct. 31, 2012
Income Tax Disclosure [Abstract]        
Effective Income Tax Rate Reconciliation, Tax Settlement, Percent 33.20% 17.40% 34.50% 27.60%