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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, 2016 | Sep. 30, 2015 | Sep. 30, 2016 | Sep. 30, 2015 | Mar. 31, 2016
Segment Reporting Information [Line Items] |  |  |  |  |
Other acquired intangible assets, net | $ 28,742 |  | $ 28,742 |  | $ 33,604
Goodwill | 116,404 |  | 116,404 |  | 117,040
Amortization of acquired intangible assets | 2,277 | $ 4,587 | 4,790 | $ 9,397 |
Operating Segments [Member] | Satellite Services [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Other acquired intangible assets, net | 6,541 |  | 6,541 |  | 8,751
Goodwill | 9,809 |  | 9,809 |  | 9,809
Amortization of acquired intangible assets | 1,105 | 2,765 | 2,209 | 5,530 |
Operating Segments [Member] | Commercial Networks [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Other acquired intangible assets, net | 5,726 |  | 5,726 |  | 6,581
Goodwill | 43,977 |  | 43,977 |  | 43,990
Amortization of acquired intangible assets | 411 | 755 | 856 | 1,251 |
Operating Segments [Member] | Government Systems [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Other acquired intangible assets, net | 16,475 |  | 16,475 |  | 18,272
Goodwill | 62,618 |  | 62,618 |  | $ 63,241
Amortization of acquired intangible assets | $ 761 | $ 1,067 | $ 1,725 | $ 2,616 |

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