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Cost Savings Initiatives (Details Textual) - USD ($)
$ in Thousands
6 Months Ended 12 Months Ended
Jul. 31, 2017
Jan. 31, 2018
Restructuring Cost And Reserve [Line Items]    
Cost savings initiative $ 6,419  
Cost Savings Initiatives    
Restructuring Cost And Reserve [Line Items]    
Cost savings initiative   $ 13,600