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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, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Mar. 31, 2021
Segment Reporting Information [Line Items] |  |  |  |  |
Other acquired intangible assets, net | $ 243,331 |  | $ 243,331 |  | $ 9,568
Goodwill | 191,125 |  | 191,125 |  | 122,300
Amortization of acquired intangible assets | 7,399 | $ 1,300 | 13,328 | $ 2,858 |
Operating Segments [Member] | Satellite Services [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Other acquired intangible assets, net | 240,419 |  | 240,419 |  | 5,738
Goodwill | 82,764 |  | 82,764 |  | 13,814
Amortization of acquired intangible assets | 7,097 | 546 | 12,419 | 1,055 |
Operating Segments [Member] | Commercial Networks [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Goodwill | 44,067 |  | 44,067 |  | 44,044
Amortization of acquired intangible assets |  |  |  | 257 |
Operating Segments [Member] | Government Systems [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Other acquired intangible assets, net | 2,912 |  | 2,912 |  | 3,830
Goodwill | 64,294 |  | 64,294 |  | $ 64,442
Amortization of acquired intangible assets | $ 302 | $ 754 | $ 909 | $ 1,546 |

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