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INTANGIBLE ASSETS: - Amounts allocated to intangible assets from acquisitions (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Mar. 31, 2021
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Finite-Lived Intangible Assets [Line Items] |  |
Finite-lived intangible assets, gross | $ 167,980 | $ 161,853
Accumulated amortization | (136,444) | (122,123)
Total finite-lived intangible assets, net | 31,536 | 39,730
Developed technology, gross (Software) |  |
Finite-Lived Intangible Assets [Line Items] |  |
Finite-lived intangible assets, gross | 84,195 | 78,547
Accumulated amortization | (65,943) | (60,424)
Total finite-lived intangible assets, net | 18,252 | 18,123
Customer relationship/Trade name, gross |  |
Finite-Lived Intangible Assets [Line Items] |  |
Finite-lived intangible assets, gross | 43,985 | 43,506
Accumulated amortization | (40,337) | (37,510)
Total finite-lived intangible assets, net | 3,648 | 5,996
Publisher/Data Supply Relationships |  |
Finite-Lived Intangible Assets [Line Items] |  |
Finite-lived intangible assets, gross | 39,800 | 39,800
Accumulated amortization | (30,164) | (24,189)
Total finite-lived intangible assets, net | $ 9,636 | $ 15,611

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