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Income Taxes (Tables)
9 Months Ended
Oct. 31, 2018
Income Tax Disclosure [Abstract]  
Schedule of Unrecognized Tax Benefits Roll Forward [Table Text Block] A reconciliation of the beginning and ending amount of unrecognized tax benefits, including interest and penalties, is as follows (amounts in thousands):

   Nine Months Ended
October 31,
   2018   2017 
           
Unrecognized tax benefits, beginning of period  $2,325   $2,096 
Changes for prior years’ tax positions   4,666    247 
Changes for current year tax positions        
Unrecognized tax benefits, end of period  $6,991   $2,343