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Basis of Presentation - Additional Information (Detail 2) - USD ($) shares in Thousands |  |  | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | --- | ---
Jan. 01, 2024 | May 30, 2023 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2023 | Dec. 31, 2022 | Mar. 31, 2023
Company And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Increase in collections in excess of revenues and deferred revenues |  |  |  |  | $ 134,000,000 |  |
Restricted cash |  |  |  |  |  |  | $ 30,532,000
Subsequent Event [Member] |  |  |  |  |  |  |
Company And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Insurance recovery proceeds | $ 260,000,000 |  |  |  |  |  |
Letter of Credit [Member] |  |  |  |  |  |  |
Company And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Restricted cash |  |  | $ 0 |  | $ 0 |  | $ 30,500,000
Funded Research and Development from Customer Contracts [Member] |  |  |  |  |  |  |
Company And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Percentage of revenue |  |  | 10.00% | 15.00% | 12.00% | 15.00% |
Other Customers [Member] |  |  |  |  |  |  |
Company And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Percentage of revenue |  |  | 83.00% | 85.00% | 83.00% | 84.00% |
U.S. Government as an Individual Customer [Member] |  |  |  |  |  |  |
Company And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Percentage of revenue |  |  | 17.00% | 15.00% | 17.00% | 16.00% |
Satellite Services [Member] |  |  |  |  |  |  |
Company And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Increase in collections in excess of revenues and deferred revenues |  |  |  |  | $ 7,500,000 |  |
Increase in collections in excess of revenues and deferred revenues(long-term) |  |  |  |  | 41,900,000 |  |
Satellite Services and Government Systems [Member] |  |  |  |  |  |  |
Company And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Increase (decrease) in unbilled accounts receivable |  |  |  |  | $ 43,200,000 |  |
Operating Segments [Member] | Commercial Networks and Government Systems [Member] | Fixed-price Contract [Member] |  |  |  |  |  |  |
Company And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Percentage of revenue |  |  | 91.00% | 90.00% | 91.00% | 88.00% |
Inmarsat Holdings [Member] |  |  |  |  |  |  |
Company And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Payments to acquire business |  | $ 550,700,000 |  |  |  |  |
Shares issued in connection with acquisition of business, net of issuance costs , shares |  | 46,360 |  |  |  |  |
Increase (decrease) in unbilled accounts receivable |  |  |  |  | $ 16,300,000 |  |
Increase in collections in excess of revenues and deferred revenues |  |  |  |  | 141,500,000 |  |
Deferred revenues, long-term portion |  |  |  |  | $ 862,500,000 |  |

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