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STOCKHOLDERS' EQUITY: - PDP Assumed Performance Plan and Qualified EPP (Details)
$ in Thousands
12 Months Ended
Mar. 31, 2020
USD ($)
numberOfIncrement
shares
Mar. 31, 2019
USD ($)
shares
Mar. 31, 2018
USD ($)
shares
Share-based compensation      
Number of increments | numberOfIncrement 4    
Other Accrued Liabilities, Current $ 68,991 $ 40,916  
Employee Stock [Member]      
Share-based compensation      
Shares which remained available for future grants (in shares) | shares 500,000    
Stock Issued During Period, Shares, Employee Stock Purchase Plans | shares 264,996 264,996 264,996
Share-based compensation expense $ 500 $ 400 $ 200
Pacific Data Partners LLC      
Share-based compensation      
Annual payout, percentage 90.00%    
Performance compensation plan, trading days 20 days    
End of period annual payout, percentage 10.00%    
Non-cash stock-based compensation expense $ 37,800    
Other Accrued Liabilities, Current $ 16,300    
Pacific Data Partners LLC | Time Vesting Restricted Stock Units      
Share-based compensation      
Debt conversion, converted instrument, rate 100.00%    
Number of increments | numberOfIncrement 3    
Incremental compensation cost $ 600    
Pacific Data Partners LLC | Common Stock      
Share-based compensation      
Performance payout $ 19,700    
Deferred compensation arrangement, shares issued (in shares) | shares 465,389    
Deferred compensation arrangement, liability-classified portion, shares issued (in shares) | shares 393,306