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The Company and a Summary of Its Significant Accounting Policies - Additional Information (Detail 6) - USD ($) $ in Millions | 12 Months Ended
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Mar. 31, 2024 | Mar. 31, 2023 | Mar. 31, 2022
Company And Summary Of Significant Accounting Policies [Line Items] |  |  |
Increase (decrease) in collections in excess of revenues and deferred revenues | $ 128.1 |  |
Increase (decrease) in unbilled accounts receivable | 51.4 |  |
Collections in excess of revenues and deferred revenues, recognized revenue | $ 97.8 | $ 115.1 |
Funded Research and Development from Customer Contracts [Member] |  |  |
Company And Summary Of Significant Accounting Policies [Line Items] |  |  |
Percentage of revenue | 12.00% | 16.00% | 18.00%
Other Customers [Member] |  |  |
Company And Summary Of Significant Accounting Policies [Line Items] |  |  |
Percentage of revenue | 83.00% | 83.00% | 82.00%
U.S. Government as an Individual Customer [Member] |  |  |
Company And Summary Of Significant Accounting Policies [Line Items] |  |  |
Percentage of revenue | 17.00% | 17.00% | 18.00%
Satellite Services [Member] |  |  |
Company And Summary Of Significant Accounting Policies [Line Items] |  |  |
Increase (decrease) in collections in excess of revenues and deferred revenues | $ (13.4) |  |
Increase (decrease) in deferred revenues, long-term portion | $ (50.8) |  |
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% | 88.00% | 91.00%
Inmarsat Holdings [Member] |  |  |
Company And Summary Of Significant Accounting Policies [Line Items] |  |  |
Increase (decrease) in unbilled accounts receivable | $ 16.3 |  |
Increase (decrease) in collections in excess of revenues and deferred revenues | 141.5 |  |
Increase (decrease) in deferred revenues, long-term portion | $ 862.5 |  |

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