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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, 2021 | Mar. 31, 2020 | Mar. 31, 2019
Segment Reporting Information [Line Items] |  |  |
Other acquired intangible assets, net | $ 9,568 | $ 14,439 |
Goodwill | 122,300 | 121,197 |
Amortization of acquired intangible assets | 5,482 | 7,611 | $ 9,655
Operating Segments [Member] | Satellite Services [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Other acquired intangible assets, net | 5,738 | 7,368 |
Goodwill | 13,814 | 13,489 |
Amortization of acquired intangible assets | 2,164 | 2,897 | 4,857
Operating Segments [Member] | Commercial Networks [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Other acquired intangible assets, net |  | 257 |
Goodwill | 44,044 | 43,981 |
Amortization of acquired intangible assets | 257 | 1,539 | 1,542
Operating Segments [Member] | Government Systems [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Other acquired intangible assets, net | 3,830 | 6,814 |
Goodwill | 64,442 | 63,727 |
Amortization of acquired intangible assets | $ 3,061 | $ 3,175 | $ 3,256

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