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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, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016 | Mar. 31, 2017
Segment Reporting Information [Line Items] |  |  |  |  |
Other acquired intangible assets, net | $ 36,796 |  | $ 36,796 |  | $ 41,677
Goodwill | 120,592 |  | 120,592 |  | 119,876
Amortization of acquired intangible assets | 3,320 | $ 2,277 | 6,580 | $ 4,790 |
Operating Segments [Member] | Satellite Services [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Other acquired intangible assets, net | 19,238 |  | 19,238 |  | 21,843
Goodwill | 13,814 |  | 13,814 |  | 13,579
Amortization of acquired intangible assets | 2,173 | 1,105 | 4,267 | 2,209 |
Operating Segments [Member] | Commercial Networks [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Other acquired intangible assets, net | 4,111 |  | 4,111 |  | 4,903
Goodwill | 43,981 |  | 43,981 |  | 43,930
Amortization of acquired intangible assets | 386 | 411 | 792 | 856 |
Operating Segments [Member] | Government Systems [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Other acquired intangible assets, net | 13,447 |  | 13,447 |  | 14,931
Goodwill | 62,797 |  | 62,797 |  | $ 62,367
Amortization of acquired intangible assets | $ 761 | $ 761 | $ 1,521 | $ 1,725 |

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