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PROPERTY, PLANT AND EQUIPMENT - Depreciation Expense and Cost of Maintenance and Repairs (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jul. 31, 2016
Jul. 31, 2015
Jul. 31, 2016
Jul. 31, 2015
Property, Plant and Equipment        
Depreciation expense $ 484 $ 140 $ 918 $ 258
Costs of Revenues        
Property, Plant and Equipment        
Rent expense $ 2,600 $ 3,800 $ 5,700 $ 8,400