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GOODWILL AND INTANGIBLE ASSETS: - Amounts allocated to intangible assets from acquisitions (Details) - USD ($)
$ in Thousands
9 Months Ended
Dec. 31, 2018
Mar. 31, 2018
Finite-Lived Intangible Assets [Line Items]    
Developed technology, gross (Software) $ 113,600 $ 113,600
Accumulated amortization (82,027) (69,072)
Total finite-lived intangible assets, net 31,573 44,528
Developed technology, gross (Software)    
Finite-Lived Intangible Assets [Line Items]    
Developed technology, gross (Software) 54,000 54,000
Accumulated amortization (48,989) (43,383)
Total finite-lived intangible assets, net 5,011 10,617
Trade name    
Finite-Lived Intangible Assets [Line Items]    
Developed technology, gross (Software) 35,800 35,800
Accumulated amortization (24,774) (20,400)
Total finite-lived intangible assets, net 11,026 15,400
Publisher Relationship    
Finite-Lived Intangible Assets [Line Items]    
Developed technology, gross (Software) 23,800 23,800
Accumulated amortization (8,264) (5,289)
Total finite-lived intangible assets, net $ 15,536 $ 18,511
Minimum    
Finite-Lived Intangible Assets [Line Items]    
Amortization period 2 years  
Maximum    
Finite-Lived Intangible Assets [Line Items]    
Amortization period 6 years