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Income Taxes - Additional Information (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022 | Mar. 31, 2023
Operating Loss Carryforwards [Line Items] |  |  |  |  |
Provision for income taxes | $ (93,077) | $ 76,646 | $ (93,610) | $ 53,833 |
Effective income tax rate | 11.00% | 1104.00% | 10.00% | (99.00%) |
Increase (decrease) in gross unrecognized tax benefits | $ 4,600 |  | $ 77,900 |  |
Valuation allowance | 288,800 |  | 288,800 |  | $ 150,000
Valuation allowance aganist R&D tax credit carryforwards |  |  | 69,000 |  |
Unrecognized tax benefits, Income tax penalties and interest expense | 3,500 |  | 17,700 |  |
Impact on effective tax rate | 18,400 |  | 18,400 |  |
Unrecognized tax benefits | $ 207,600 |  | 207,600 |  |
Inmarsat Holdings [Member] |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |
Unrecognized tax benefits, Income tax penalties and interest expense resulting from acquisition |  |  | 17,100 |  |
Unrecognized tax Benefits, Increase resulting from acquisition |  |  | $ 62,100 |  |

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