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Acquisition - Additional Information (Detail) - USD ($) shares in Thousands, $ in Thousands |  | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
May 30, 2023 | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2024 | Dec. 31, 2023 | Mar. 31, 2024
Business Acquisition [Line Items] |  |  |  |  |  |
Preliminary estimated goodwill |  | $ 1,620,267 |  | $ 1,620,267 |  | $ 1,621,763
Issuance of common stock in connection with acquisition |  |  |  |  | $ 2,123,455 |
Total revenues |  | 1,123,767 | $ 1,128,539 | 3,372,489 | 3,133,745 |
Net losses |  | (158,413) | (124,399) | (328,909) | (968,641) |
Operating Expense [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Severance costs |  |  | 45,000 |  | 45,000 |
Inmarsat Holdings [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Preliminary estimated goodwill | $ 1,462,881 |  |  |  |  |
The consideration transferred | 2,700,000 |  |  |  |  |
Payments to acquire business | 550,700 |  |  |  |  |
Issuance of common stock in connection with acquisition | $ 2,100,000 |  |  |  |  |
Shares issued in connection with acquisition of business, net of issuance costs, shares | 46,360 |  |  |  |  |
Unfavorable contract liabilities included in current liabilities | $ 29,600 |  |  |  |  |
Unfavorable contract liabilities included in other long term liabilities | $ 248,300 |  |  |  |  |
Unfavorable contract liabilities weighted average estimated useful life | 9 years |  |  |  |  |
Total revenues |  |  | 443,100 |  | 1,000,000 |
Net losses |  |  | (24,200) |  | (159,300) |
Inmarsat Holdings [Member] | Selling General and Administrative Expenses [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Acquisition-related transaction costs |  | $ 0 | $ 30,800 | $ 0 | $ 30,800 |
Communication Services [Member] | Inmarsat Holdings [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Preliminary estimated goodwill | $ 1,500,000 |  |  |  |  |

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