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Segment Information - Other Acquired Intangible Assets, Net and Goodwill Included in Segment Assets and Amortization of Acquired Intangible Assets by Segment (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
Segment Reporting Information [Line Items] |  |  |  |  |
Other acquired intangible assets, net | $ 2,773,665 |  | $ 2,773,665 |  | $ 201,205
Goodwill | 1,613,706 |  | 1,613,706 |  | 158,542
Amortization of acquired intangible assets | 91,719 | $ 7,433 | 200,904 | $ 22,335 |
Operating Segments [Member] | Satellite Services [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Other acquired intangible assets, net | 2,375,977 |  | 2,375,977 |  | 200,097
Goodwill | 1,050,740 |  | 1,050,740 |  | 80,589
Amortization of acquired intangible assets | 80,328 | 7,142 | 179,151 | 21,458 |
Operating Segments [Member] | Commercial Networks [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Goodwill | 41,188 |  | 41,188 |  | 41,014
Operating Segments [Member] | Government Systems [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Other acquired intangible assets, net | 397,688 |  | 397,688 |  | 1,108
Goodwill | 521,778 |  | 521,778 |  | $ 36,939
Amortization of acquired intangible assets | $ 11,391 | $ 291 | $ 21,753 | $ 877 |

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