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INTANGIBLE ASSETS - Amounts Allocated to Intangible Assets from Acquisitions (Details) - USD ($) $ in Thousands | Sep. 30, 2023 | Mar. 31, 2023
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Finite-Lived Intangible Assets [Line Items] |  |
Finite-lived intangible assets, gross | $ 122,404 | $ 122,479
Accumulated amortization | (117,043) | (112,611)
Total finite-lived intangible assets, net | 5,361 | 9,868
Developed technology, gross |  |
Finite-Lived Intangible Assets [Line Items] |  |
Finite-lived intangible assets, gross | 72,028 | 72,095
Accumulated amortization | (66,698) | (63,658)
Total finite-lived intangible assets, net | 5,330 | 8,437
Customer relationship/trade name, gross |  |
Finite-Lived Intangible Assets [Line Items] |  |
Finite-lived intangible assets, gross | 34,376 | 34,384
Accumulated amortization | (34,345) | (33,953)
Total finite-lived intangible assets, net | 31 | 431
Publisher/data supply relationships, gross |  |
Finite-Lived Intangible Assets [Line Items] |  |
Finite-lived intangible assets, gross | 16,000 | 16,000
Accumulated amortization | (16,000) | (15,000)
Total finite-lived intangible assets, net | $ 0 | $ 1,000

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