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CASH, CASH EQUIVALENTS, MARKETABLE SECURITIES AND INVESTMENTS - Narrative (Details) - USD ($) $ in Thousands, shares in Millions |  | 1 Months Ended | 6 Months Ended
--- | --- | --- | ---
Aug. 04, 2025 | Apr. 30, 2023 | Feb. 28, 2023 | Sep. 30, 2025 | Sep. 30, 2024
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |
(Loss) gain on fair value of equity investment |  |  |  | $ (1,008) | $ 7,633
Foreign Exchange Forward | Napatech |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |
Number of shares acquired (in shares) |  | 6.2 | 6.2 |  |
Payment for common stock |  |  | $ 7,500 |  |
Proceeds from sale of equity investment in Napatech | $ 11,800 |  |  |  |
(Loss) gain on fair value of equity investment |  |  |  | $ (1,000) | 7,600
Unrealized gain related to foreign currency translation |  |  |  |  | $ 700

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