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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 | 12 Months Ended
--- | ---
Mar. 31, 2022 | Mar. 31, 2021 | Mar. 31, 2020
Segment Reporting Information [Line Items] |  |  |
Other acquired intangible assets, net | $ 236,043 | $ 9,568 |
Goodwill | 190,113 | 122,300 |
Amortization of acquired intangible assets | 28,729 | 5,482 | $ 7,611
Operating Segments [Member] | Satellite Services [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Other acquired intangible assets, net | 233,740 | 5,738 |
Goodwill | 81,972 | 13,814 |
Amortization of acquired intangible assets | 27,220 | 2,164 | 2,897
Operating Segments [Member] | Commercial Networks [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Goodwill | 44,050 | 44,044 |
Amortization of acquired intangible assets |  | 257 | 1,539
Operating Segments [Member] | Government Systems [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Other acquired intangible assets, net | 2,303 | 3,830 |
Goodwill | 64,091 | 64,442 |
Amortization of acquired intangible assets | $ 1,509 | $ 3,061 | $ 3,175

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