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INTANGIBLE ASSETS: - Amounts allocated to intangible assets from acquisitions (Details) - USD ($)
$ in Thousands
Mar. 31, 2021
Mar. 31, 2020
Finite-Lived Intangible Assets [Line Items]    
Finite-lived intangible assets, gross $ 161,853 $ 149,244
Accumulated amortization (122,123) (104,044)
Total finite-lived intangible assets, net 39,730 45,200
Developed technology, gross (Software)    
Finite-Lived Intangible Assets [Line Items]    
Finite-lived intangible assets, gross 78,547 66,451
Accumulated amortization (60,424) (54,713)
Total finite-lived intangible assets, net 18,123 11,738
Customer relationships/trade names    
Finite-Lived Intangible Assets [Line Items]    
Finite-lived intangible assets, gross 43,506 42,993
Accumulated amortization (37,510) (33,109)
Total finite-lived intangible assets, net 5,996 9,884
Publisher/Data Supply Relationships    
Finite-Lived Intangible Assets [Line Items]    
Finite-lived intangible assets, gross 39,800 39,800
Accumulated amortization (24,189) (16,222)
Total finite-lived intangible assets, net $ 15,611 $ 23,578