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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, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019 | Mar. 31, 2020
Segment Reporting Information [Line Items] |  |  |  |  |
Other acquired intangible assets, net | $ 12,030 |  | $ 12,030 |  | $ 14,439
Goodwill | 121,765 |  | 121,765 |  | 121,197
Amortization of acquired intangible assets | 1,300 | $ 2,027 | 2,858 | $ 4,064 |
Operating Segments [Member] | Satellite Services [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Other acquired intangible assets, net | 6,733 |  | 6,733 |  | 7,368
Goodwill | 13,758 |  | 13,758 |  | 13,489
Amortization of acquired intangible assets | 546 | 850 | 1,055 | 1,705 |
Operating Segments [Member] | Commercial Networks [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Other acquired intangible assets, net |  |  |  |  | 257
Goodwill | 44,063 |  | 44,063 |  | 43,981
Amortization of acquired intangible assets |  | 386 | 257 | 772 |
Operating Segments [Member] | Government Systems [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Other acquired intangible assets, net | 5,297 |  | 5,297 |  | 6,814
Goodwill | 63,944 |  | 63,944 |  | $ 63,727
Amortization of acquired intangible assets | $ 754 | $ 791 | $ 1,546 | $ 1,587 |

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