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Income Taxes - Narrative (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Mar. 31, 2025 | Mar. 31, 2024 | Mar. 31, 2023 | Mar. 31, 2022
Income Tax Contingency [Line Items] |  |  |  |
Provision for income taxes | $ 3,149 | $ 3,642 | $ 2,807 |
Undistributed earnings of foreign subsidiaries | 1,300 | 2,600 | 2,700 |
Deferred tax assets, valuation allowance | 368,773 | 368,408 |  |
Operating loss carryforwards | 1,023,800 |  |  |
Operating loss carryforwards, subject to expiration | 321,500 |  |  |
Operating loss carryforward, indefinitely | 702,300 |  |  |
Unrecognized tax benefits | 10,074 | 10,811 | $ 10,113 | $ 9,850
Accrued penalties and interest | 0 | $ 200 |  |
Domestic |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |
Research tax credit carryforwards | 15,500 |  |  |
State and local |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |
Operating loss carryforwards | 869,400 |  |  |
Research tax credit carryforwards | $ 24,200 |  |  |

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