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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, 2017 | Dec. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Mar. 31, 2017
Segment Reporting Information [Line Items] |  |  |  |  |
Other acquired intangible assets, net | $ 33,862 |  | $ 33,862 |  | $ 41,677
Goodwill | 120,682 |  | 120,682 |  | 119,876
Amortization of acquired intangible assets | 3,177 | $ 2,775 | 9,757 | $ 7,565 |
Operating Segments [Member] | Satellite Services [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Other acquired intangible assets, net | 17,449 |  | 17,449 |  | 21,843
Goodwill | 13,876 |  | 13,876 |  | 13,579
Amortization of acquired intangible assets | 2,031 | 1,605 | 6,297 | 3,814 |
Operating Segments [Member] | Commercial Networks [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Other acquired intangible assets, net | 3,725 |  | 3,725 |  | 4,903
Goodwill | 43,969 |  | 43,969 |  | 43,930
Amortization of acquired intangible assets | 385 | 411 | 1,178 | 1,267 |
Operating Segments [Member] | Government Systems [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Other acquired intangible assets, net | 12,688 |  | 12,688 |  | 14,931
Goodwill | 62,837 |  | 62,837 |  | $ 62,367
Amortization of acquired intangible assets | $ 761 | $ 759 | $ 2,282 | $ 2,484 |

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