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REVENUES (Details) - USD ($)
$ in Thousands
12 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Contract with Customer, Asset and Liability [Abstract]    
Accounts receivable - trade $ 16,200 $ 28,100
Current (included in deferred revenue) 46,356 34,643
Non-current (included in other liabilities) 13,593 12,699
Revenue recognized from the beginning contract liability 32,000 $ 60,900
Revenue, Performance Obligation Satisfied over Time [Abstract]    
Remaining performance obligation 36,542  
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2019-04-01    
Revenue, Performance Obligation Satisfied over Time [Abstract]    
Remaining performance obligation $ 22,949  
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 $ 9,594  
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 $ 3,182  
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 $ 796  
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 $ 21  
Expected timing of satisfaction, period 1 year