INTANGIBLE ASSETS: - Amounts allocated to intangible assets from acquisitions (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Mar. 31, 2020
Finite-Lived Intangible Assets [Line Items]
Developed technology, gross (Software)	$ 150,492	$ 149,244
Accumulated amortization	(117,915)	(104,044)
Total finite-lived intangible assets, net	32,577	45,200
Developed technology, gross (Software)
Finite-Lived Intangible Assets [Line Items]
Developed technology, gross (Software)	67,582	66,451
Accumulated amortization	(59,063)	(54,713)
Total finite-lived intangible assets, net	8,519	11,738
Trade name
Finite-Lived Intangible Assets [Line Items]
Developed technology, gross (Software)	43,110	42,993
Accumulated amortization	(36,655)	(33,109)
Total finite-lived intangible assets, net	6,455	9,884
Publisher Relationship
Finite-Lived Intangible Assets [Line Items]
Developed technology, gross (Software)	39,800	39,800
Accumulated amortization	(22,197)	(16,222)
Total finite-lived intangible assets, net	$ 17,603	$ 23,578