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REVENUE Deferred Revenue (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jul. 31, 2018
Jul. 31, 2018
Jan. 31, 2018
Deferred Revenue Arrangement [Line Items]      
Deferred Revenue $ 22,731 $ 22,731 $ 32,324
Recognition of Deferred Revenue (9,800) (27,000)  
Deferred Revenue from Operating Leases and Rental Contracts [Member]      
Deferred Revenue Arrangement [Line Items]      
Deferred Revenue 1,605 1,605 2,186
Deferred Revenue from Contracts with Customers [Member]      
Deferred Revenue Arrangement [Line Items]      
Deferred Revenue $ 21,126 $ 21,126 $ 30,139