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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, 2018 | Dec. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Mar. 31, 2018
Segment Reporting Information [Line Items] |  |  |  |  |
Other acquired intangible assets, net | $ 24,760 |  | $ 24,760 |  | $ 31,862
Goodwill | 121,506 |  | 121,506 |  | 121,085
Amortization of acquired intangible assets | 2,487 | $ 3,177 | 7,375 | $ 9,757 |
Operating Segments [Member] | Satellite Services [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Other acquired intangible assets, net | 11,751 |  | 11,751 |  | 16,580
Goodwill | 13,694 |  | 13,694 |  | 13,991
Amortization of acquired intangible assets | 1,183 | 2,031 | 3,776 | 6,297 |
Operating Segments [Member] | Commercial Networks [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Other acquired intangible assets, net | 2,183 |  | 2,183 |  | 3,340
Goodwill | 43,955 |  | 43,955 |  | 44,011
Amortization of acquired intangible assets | 386 | 385 | 1,157 | 1,178 |
Operating Segments [Member] | Government Systems [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Other acquired intangible assets, net | 10,826 |  | 10,826 |  | 11,942
Goodwill | 63,857 |  | 63,857 |  | $ 63,083
Amortization of acquired intangible assets | $ 918 | $ 761 | $ 2,442 | $ 2,282 |

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