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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, 2021 | Dec. 31, 2020 | Dec. 31, 2021 | Dec. 31, 2020 | Mar. 31, 2021
Segment Reporting Information [Line Items] |  |  |  |  |
Other acquired intangible assets, net | $ 237,850 |  | $ 237,850 |  | $ 9,568
Goodwill | 190,907 |  | 190,907 |  | 122,300
Amortization of acquired intangible assets | 7,531 | $ 1,313 | 20,859 | $ 4,171 |
Operating Segments [Member] | Satellite Services [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Other acquired intangible assets, net | 235,240 |  | 235,240 |  | 5,738
Goodwill | 82,567 |  | 82,567 |  | 13,814
Amortization of acquired intangible assets | 7,231 | 557 | 19,650 | 1,612 |
Operating Segments [Member] | Commercial Networks [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Goodwill | 44,083 |  | 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 | 2,610 |  | 2,610 |  | 3,830
Goodwill | 64,257 |  | 64,257 |  | $ 64,442
Amortization of acquired intangible assets | $ 300 | $ 756 | $ 1,209 | $ 2,302 |

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