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REVENUES (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Mar. 31, 2019
Contract with Customer, Asset and Liability [Abstract]          
Accounts receivable - trade $ 22,100   $ 22,100   $ 16,200
Current (included in deferred revenue) 49,416   49,416   46,356
Non-current (included in other liabilities) 17,133   17,133   $ 13,593
Revenue recognized from the beginning contract liability 13,600 $ 8,100 29,400 $ 20,900  
Revenue, Performance Obligation Satisfied over Time [Abstract]          
Remaining performance obligation 41,826   41,826    
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2019-07-01          
Revenue, Performance Obligation Satisfied over Time [Abstract]          
Remaining performance obligation $ 15,118   $ 15,118    
Expected timing of satisfaction, period 6 months   6 months    
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-04-01          
Revenue, Performance Obligation Satisfied over Time [Abstract]          
Remaining performance obligation $ 15,940   $ 15,940    
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 $ 7,817   $ 7,817    
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 $ 2,124   $ 2,124    
Expected timing of satisfaction, period 1 year   1 year    
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2024-04-01          
Revenue, Performance Obligation Satisfied over Time [Abstract]          
Remaining performance obligation $ 404   $ 404    
Expected timing of satisfaction, period 1 year   1 year    
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2025-04-01          
Revenue, Performance Obligation Satisfied over Time [Abstract]          
Remaining performance obligation $ 423   $ 423    
Expected timing of satisfaction, period 1 year   1 year