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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, 2016 | Dec. 31, 2015 | Dec. 31, 2016 | Dec. 31, 2015 | Mar. 31, 2016
Segment Reporting Information [Line Items] |  |  |  |  |
Other acquired intangible assets, net | $ 44,552 |  | $ 44,552 |  | $ 33,604
Goodwill | 119,625 |  | 119,625 |  | 117,040
Amortization of acquired intangible assets | 2,775 | $ 4,261 | 7,565 | $ 13,658 |
Operating Segments [Member] | Satellite Services [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Other acquired intangible assets, net | 23,556 |  | 23,556 |  | 8,751
Goodwill | 13,434 |  | 13,434 |  | 9,809
Amortization of acquired intangible assets | 1,605 | 2,488 | 3,814 | 8,018 |
Operating Segments [Member] | Commercial Networks [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Other acquired intangible assets, net | 5,314 |  | 5,314 |  | 6,581
Goodwill | 43,892 |  | 43,892 |  | 43,990
Amortization of acquired intangible assets | 411 | 706 | 1,267 | 1,957 |
Operating Segments [Member] | Government Systems [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Other acquired intangible assets, net | 15,682 |  | 15,682 |  | 18,272
Goodwill | 62,299 |  | 62,299 |  | $ 63,241
Amortization of acquired intangible assets | $ 759 | $ 1,067 | $ 2,484 | $ 3,683 |

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