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Income Taxes - Additional Information (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2023 | Dec. 31, 2022 | Mar. 31, 2023
Operating Loss Carryforwards [Line Items] |  |  |  |  |
(Provision for) benefit from income taxes from continuing operations | $ 34,496 | $ (5,212) | $ 128,106 | $ (59,045) |
Effective income tax rate | 22.00% | (13.00%) | 12.00% | (63.00%) |
Increase (decrease) in gross unrecognized tax benefits | $ (28,300) |  | $ 49,600 |  |
Valuation allowance | 285,100 |  | 285,100 |  | $ 150,000
Valuation allowance aganist R&D tax credit carryforwards |  |  | 69,000 |  |
Increase (decrease) in unrecognized tax benefits income tax penalties and interest expense | (7,600) |  | 10,100 |  |
Impact on effective tax rate | 14,500 |  | 14,500 |  |
Unrecognized tax benefits | $ 179,300 |  | 179,300 |  |
Inmarsat Holdings [Member] |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |
Unrecognized tax benefits, Income tax penalties and interest expense resulting from acquisition |  |  | 14,900 |  |
Unrecognized tax Benefits, Increase resulting from acquisition |  |  | $ 51,600 |  |

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