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INTANGIBLE ASSETS: - Amounts allocated to intangible assets from acquisitions (Details) - USD ($) $ in Thousands | Mar. 31, 2021 | Mar. 31, 2020
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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

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