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Income Tax (Details) - USD ($)
$ in Thousands
3 Months Ended
Apr. 30, 2018
Apr. 30, 2017
Income Tax Contingency [Line Items]    
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent 21.00% 35.00%
Effective Income Tax Rate Reconciliation, Percent 18.60% 31.40%
Other Tax benefit (expense) $ 243 $ (479)