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REVENUES (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Mar. 31, 2018
Contract with Customer, Asset and Liability [Abstract]          
Accounts receivable - trade $ 38,000   $ 38,000   $ 28,100
Current (included in deferred revenue) 35,036   35,036   34,643
Non-current (included in other liabilities) 13,430   13,430   $ 12,699
Revenue recognized from the beginning contract liability 8,100 $ 36,000 20,900 $ 55,500  
Revenue, Performance Obligation Satisfied over Time [Abstract]          
Remaining performance obligation 33,163   33,163    
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2018-10-01          
Revenue, Performance Obligation Satisfied over Time [Abstract]          
Remaining performance obligation $ 12,337   $ 12,337    
Expected timing of satisfaction, period 6 months   6 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 $ 12,607   $ 12,607    
Expected timing of satisfaction, period 1 year   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 $ 6,837   $ 6,837    
Expected timing of satisfaction, period 1 year   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 $ 1,078   $ 1,078    
Expected timing of satisfaction, period 1 year   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 $ 302   $ 302    
Expected timing of satisfaction, period 1 year   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 $ 2   $ 2    
Expected timing of satisfaction, period 1 year   1 year