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Income Taxes (Details)
3 Months Ended 9 Months Ended
Oct. 31, 2016
Oct. 31, 2015
Oct. 31, 2016
Oct. 31, 2015
Income Tax Disclosure [Abstract]        
Effective Income Tax Rate Reconciliation, Tax Settlement, Percent 33.30% 14.80% 32.90% 28.10%
Effective Income Tax Rate Reconciliation, Deduction, Percent 1.90% 17.00% 1.40% 7.00%