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REVENUES (Details) - USD ($)
$ in Thousands
3 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Mar. 31, 2018
Contract with Customer, Asset and Liability [Abstract]      
Accounts receivable - trade $ 21,000 $ 28,100  
Current (included in deferred revenue) 34,448   $ 34,643
Non-current (included in other liabilities) 11,739   $ 12,699
Revenue recognized from the beginning contract liability 12,800 $ 19,500  
Revenue, Performance Obligation Satisfied over Time [Abstract]      
Remaining performance obligation 29,359    
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2018-07-01      
Revenue, Performance Obligation Satisfied over Time [Abstract]      
Remaining performance obligation $ 14,868    
Expected timing of satisfaction, period 9 months    
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2019-04-01      
Revenue, Performance Obligation Satisfied over Time [Abstract]      
Remaining performance obligation $ 9,105    
Expected timing of satisfaction, period 1 year    
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2020-04-01      
Revenue, Performance Obligation Satisfied over Time [Abstract]      
Remaining performance obligation $ 4,811    
Expected timing of satisfaction, period 1 year    
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-04-01      
Revenue, Performance Obligation Satisfied over Time [Abstract]      
Remaining performance obligation $ 421    
Expected timing of satisfaction, period 1 year    
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2022-04-01      
Revenue, Performance Obligation Satisfied over Time [Abstract]      
Remaining performance obligation $ 153    
Expected timing of satisfaction, period 1 year    
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2023-04-01      
Revenue, Performance Obligation Satisfied over Time [Abstract]      
Remaining performance obligation $ 1    
Expected timing of satisfaction, period 1 year