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INCOME TAXES - Narrative (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023 | Mar. 31, 2024 | Mar. 31, 2023 | Mar. 31, 2022 | Mar. 31, 2021
Income Tax Contingency [Line Items] |  |  |  |  |  |  |  |
Increase (decrease) in valuation allowance |  |  |  |  | $ 6,500 | $ 3,100 | $ (7,400) |
Increase in balances related to tax positions in prior period |  |  |  |  | 8,000 |  |  |
Total unrecognized tax benefit including interest and penalties |  |  |  |  | 89,500 |  |  |
Unrecognized tax benefits that would impact effective tax rate | $ 78,000 |  | $ 78,000 |  | 77,100 |  |  |
Accrued interest and penalties | 1,300 |  | 1,300 |  | 1,200 |  |  |
Unrecognized tax benefits | $ 90,500 |  | $ 90,500 |  | 88,341 | $ 96,343 | $ 99,603 | $ 101,119
Increase in unrecognized tax benefits is reasonably possible |  |  |  |  | 12,600 |  |  |
Increase in unrecognized tax benefits valuation allowance is reasonably possible |  |  |  |  | 11,900 |  |  |
Increase in unrecognized tax benefits net is reasonably possible |  |  |  |  | 700 |  |  |
Federal net operating loss |  |  |  |  | 208,500 |  |  |
Tax credit carryforwards |  |  |  |  | 47,300 |  |  |
Indefinite lived operating loss carry forward |  |  |  |  | 12,800 |  |  |
Acquired net operating losses included in carryforwards |  |  |  |  | 11,100 |  |  |
Acquired credits included in carryforwards |  |  |  |  | 2,500 |  |  |
Effective Income Tax Rate Reconciliation, Percent | (2.30%) | (19.00%) | (1.60%) | (9.30%) |  |  |  |
Other long-term assets |  |  |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |  |  |
Unrecognized tax benefits | $ 83,000 |  | $ 83,000 |  | 82,400 |  |  |
Other long-term liabilities |  |  |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |  |  |
Unrecognized tax benefits | $ 7,600 |  | $ 7,600 |  | $ 7,100 |  |  |

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