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INTANGIBLE ASSETS: - Amounts allocated to intangible assets from acquisitions (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Mar. 31, 2021
Finite-Lived Intangible Assets [Line Items]    
Finite-lived intangible assets, gross $ 165,321 $ 161,853
Accumulated amortization (131,351) (122,123)
Total finite-lived intangible assets, net 33,970 39,730
Developed technology, gross (Software)    
Finite-Lived Intangible Assets [Line Items]    
Finite-lived intangible assets, gross 82,018 78,547
Accumulated amortization (64,065) (60,424)
Total finite-lived intangible assets, net 17,953 18,123
Customer relationship/Trade name, gross    
Finite-Lived Intangible Assets [Line Items]    
Finite-lived intangible assets, gross 43,503 43,506
Accumulated amortization (39,114) (37,510)
Total finite-lived intangible assets, net 4,389 5,996
Publisher/Data Supply Relationships    
Finite-Lived Intangible Assets [Line Items]    
Finite-lived intangible assets, gross 39,800 39,800
Accumulated amortization (28,172) (24,189)
Total finite-lived intangible assets, net $ 11,628 $ 15,611