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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 |
--- | --- | ---
Jun. 30, 2016 | Jun. 30, 2015 | Mar. 31, 2016
Segment Reporting Information [Line Items] |  |  |
Other acquired intangible assets, net | $ 31,039 |  | $ 33,604
Goodwill | 116,560 |  | 117,040
Amortization of acquired intangible assets | 2,513 | $ 4,810 |
Operating Segments [Member] | Satellite Services [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Other acquired intangible assets, net | 7,646 |  | 8,751
Goodwill | 9,809 |  | 9,809
Amortization of acquired intangible assets | 1,104 | 2,765 |
Operating Segments [Member] | Commercial Networks [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Other acquired intangible assets, net | 6,137 |  | 6,581
Goodwill | 43,956 |  | 43,990
Amortization of acquired intangible assets | 445 | 496 |
Operating Segments [Member] | Government Systems [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Other acquired intangible assets, net | 17,256 |  | 18,272
Goodwill | 62,795 |  | $ 63,241
Amortization of acquired intangible assets | $ 964 | $ 1,549 |

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