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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, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Mar. 31, 2018
Segment Reporting Information [Line Items] |  |  |  |  |
Other acquired intangible assets, net | $ 26,072 |  | $ 26,072 |  | $ 31,862
Goodwill | 122,676 |  | 122,676 |  | 121,085
Amortization of acquired intangible assets | 2,435 | $ 3,320 | 4,888 | $ 6,580 |
Operating Segments [Member] | Satellite Services [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Other acquired intangible assets, net | 13,112 |  | 13,112 |  | 16,580
Goodwill | 13,749 |  | 13,749 |  | 13,991
Amortization of acquired intangible assets | 1,289 | 2,173 | 2,593 | 4,267 |
Operating Segments [Member] | Commercial Networks [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Other acquired intangible assets, net | 2,569 |  | 2,569 |  | 3,340
Goodwill | 43,959 |  | 43,959 |  | 44,011
Amortization of acquired intangible assets | 385 | 386 | 771 | 792 |
Operating Segments [Member] | Government Systems [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Other acquired intangible assets, net | 10,391 |  | 10,391 |  | 11,942
Goodwill | 64,968 |  | 64,968 |  | $ 63,083
Amortization of acquired intangible assets | $ 761 | $ 761 | $ 1,524 | $ 1,521 |

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