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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 | 12 Months Ended
--- | ---
Mar. 31, 2018 | Mar. 31, 2017 | Mar. 31, 2016
Segment Reporting Information [Line Items] |  |  |
Other acquired intangible assets, net | $ 31,862 | $ 41,677 |
Goodwill | 121,085 | 119,876 |
Amortization of acquired intangible assets | 12,231 | 10,788 | $ 16,438
Operating Segments [Member] | Satellite Services [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Other acquired intangible assets, net | 16,580 | 21,843 |
Goodwill | 13,991 | 13,579 |
Amortization of acquired intangible assets | 7,622 | 5,866 | 9,122
Operating Segments [Member] | Commercial Networks [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Other acquired intangible assets, net | 3,340 | 4,903 |
Goodwill | 44,011 | 43,930 |
Amortization of acquired intangible assets | 1,563 | 1,679 | 2,569
Operating Segments [Member] | Government Systems [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Other acquired intangible assets, net | 11,942 | 14,931 |
Goodwill | 63,083 | 62,367 |
Amortization of acquired intangible assets | $ 3,046 | $ 3,243 | $ 4,747

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- Definition Amount after amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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