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ACQUISITIONS: (Details)
2 Months Ended 3 Months Ended 12 Months Ended
Feb. 14, 2018
USD ($)
Mar. 31, 2018
USD ($)
Mar. 31, 2019
USD ($)
Mar. 31, 2019
USD ($)
numberOfIncrement
Mar. 31, 2018
USD ($)
Mar. 31, 2017
USD ($)
Business Acquisition [Line Items]            
Cash paid in acquisitions, net of cash acquired       $ 0 $ 4,478,000 $ 137,383,000
Number of increments | numberOfIncrement       4    
Non-cash stock-based compensation expense       $ 102,722,000 $ 52,867,000 $ 39,408,000
Pacific Data Partners LLC            
Business Acquisition [Line Items]            
Cash paid in acquisitions, net of cash acquired $ 4,478,000          
Funds held in escrow 500,000          
Cash $ 228,000          
Annual payout, percentage       90.00%    
Performance compensation plan, trading days       20 days    
End of period annual payout, percentage       10.00%    
Performance attainment payment     $ 0      
Non-cash stock-based compensation expense   $ 17,800,000        
Pacific Data Partners LLC | Minimum            
Business Acquisition [Line Items]            
Performance attainment payment       $ 0.0    
Pacific Data Partners LLC | Maximum            
Business Acquisition [Line Items]            
Performance attainment payment       $ 65,000,000.0