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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 | 6 Months Ended |
--- | --- | --- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022 | Mar. 31, 2023
Segment Reporting Information [Line Items] |  |  |  |  |
Other acquired intangible assets, net | $ 2,771,837 |  | $ 2,771,837 |  | $ 201,205
Goodwill | 1,375,542 |  | 1,375,542 |  | 158,542
Amortization of acquired intangible assets | 81,374 | $ 7,379 | 109,185 | $ 14,902 |
Operating Segments [Member] | Satellite Services [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Other acquired intangible assets, net | 2,441,089 |  | 2,441,089 |  | 200,097
Goodwill | 891,681 |  | 891,681 |  | 80,589
Amortization of acquired intangible assets | 77,172 | 7,088 | 98,823 | 14,316 |
Operating Segments [Member] | Commercial Networks [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Goodwill | 41,021 |  | 41,021 |  | 41,014
Operating Segments [Member] | Government Systems [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Other acquired intangible assets, net | 330,748 |  | 330,748 |  | 1,108
Goodwill | 442,840 |  | 442,840 |  | $ 36,939
Amortization of acquired intangible assets | $ 4,202 | $ 291 | $ 10,362 | $ 586 |

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