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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, 2019 | Mar. 31, 2018 | Mar. 31, 2017
Segment Reporting Information [Line Items] |  |  |
Other acquired intangible assets, net | $ 22,301 | $ 31,862 |
Goodwill | 121,719 | 121,085 |
Amortization of acquired intangible assets | 9,655 | 12,231 | $ 10,788
Operating Segments [Member] | Satellite Services [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Other acquired intangible assets, net | 10,453 | 16,580 |
Goodwill | 13,617 | 13,991 |
Amortization of acquired intangible assets | 4,857 | 7,622 | 5,866
Operating Segments [Member] | Commercial Networks [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Other acquired intangible assets, net | 1,798 | 3,340 |
Goodwill | 43,933 | 44,011 |
Amortization of acquired intangible assets | 1,542 | 1,563 | 1,679
Operating Segments [Member] | Government Systems [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Other acquired intangible assets, net | 10,050 | 11,942 |
Goodwill | 64,169 | 63,083 |
Amortization of acquired intangible assets | $ 3,256 | $ 3,046 | $ 3,243

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