INTANGIBLE ASSETS: - Amounts allocated to intangible assets from acquisitions (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Mar. 31, 2019
Finite-Lived Intangible Assets [Line Items]
Developed technology, gross (Software)	$ 149,244	$ 113,600
Accumulated amortization	(104,044)	(85,008)
Total finite-lived intangible assets, net	45,200	28,592
Developed technology, gross (Software)
Finite-Lived Intangible Assets [Line Items]
Developed technology, gross (Software)	66,451	54,000
Accumulated amortization	(54,713)	(49,625)
Total finite-lived intangible assets, net	11,738	4,375
Trade name
Finite-Lived Intangible Assets [Line Items]
Developed technology, gross (Software)	42,993	35,800
Accumulated amortization	(33,109)	(26,128)
Total finite-lived intangible assets, net	9,884	9,672
Publisher Relationship
Finite-Lived Intangible Assets [Line Items]
Developed technology, gross (Software)	39,800	23,800
Accumulated amortization	(16,222)	(9,255)
Total finite-lived intangible assets, net	$ 23,578	$ 14,545