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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 |
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Mar. 31, 2021
Segment Reporting Information [Line Items] |  |  |
Other acquired intangible assets, net | $ 261,941 |  | $ 9,568
Goodwill | 181,737 |  | 122,300
Amortization of acquired intangible assets | 5,929 | $ 1,558 |
Operating Segments [Member] | Satellite Services [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Other acquired intangible assets, net | 258,713 |  | 5,738
Goodwill | 73,155 |  | 13,814
Amortization of acquired intangible assets | 5,322 | 509 |
Operating Segments [Member] | Commercial Networks [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Goodwill | 44,083 |  | 44,044
Amortization of acquired intangible assets |  | 257 |
Operating Segments [Member] | Government Systems [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Other acquired intangible assets, net | 3,228 |  | 3,830
Goodwill | 64,499 |  | $ 64,442
Amortization of acquired intangible assets | $ 607 | $ 792 |

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