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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, 2019 | Dec. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Mar. 31, 2019
Segment Reporting Information [Line Items] |  |  |  |  |
Other acquired intangible assets, net | $ 16,271 |  | $ 16,271 |  | $ 22,301
Goodwill | 121,745 |  | 121,745 |  | 121,719
Amortization of acquired intangible assets | 1,856 | $ 2,487 | 5,920 | $ 7,375 |
Operating Segments [Member] | Satellite Services [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Other acquired intangible assets, net | 7,966 |  | 7,966 |  | 10,453
Goodwill | 13,575 |  | 13,575 |  | 13,617
Amortization of acquired intangible assets | 678 | 1,183 | 2,383 | 3,776 |
Operating Segments [Member] | Commercial Networks [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Other acquired intangible assets, net | 642 |  | 642 |  | 1,798
Goodwill | 43,959 |  | 43,959 |  | 43,933
Amortization of acquired intangible assets | 384 | 386 | 1,156 | 1,157 |
Operating Segments [Member] | Government Systems [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Other acquired intangible assets, net | 7,663 |  | 7,663 |  | 10,050
Goodwill | 64,211 |  | 64,211 |  | $ 64,169
Amortization of acquired intangible assets | $ 794 | $ 918 | $ 2,381 | $ 2,442 |

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