INTANGIBLE ASSETS: - Amounts allocated to intangible assets from acquisitions (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Mar. 31, 2020
Finite-Lived Intangible Assets [Line Items]
Developed technology, gross (Software)	$ 150,408	$ 149,244
Accumulated amortization	(113,699)	(104,044)
Total finite-lived intangible assets, net	36,709	45,200
Developed technology, gross (Software)
Finite-Lived Intangible Assets [Line Items]
Developed technology, gross (Software)	67,507	66,451
Accumulated amortization	(57,678)	(54,713)
Total finite-lived intangible assets, net	9,829	11,738
Trade name
Finite-Lived Intangible Assets [Line Items]
Developed technology, gross (Software)	43,101	42,993
Accumulated amortization	(35,816)	(33,109)
Total finite-lived intangible assets, net	7,285	9,884
Publisher Relationship
Finite-Lived Intangible Assets [Line Items]
Developed technology, gross (Software)	39,800	39,800
Accumulated amortization	(20,205)	(16,222)
Total finite-lived intangible assets, net	$ 19,595	$ 23,578