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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, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | Mar. 31, 2019
Segment Reporting Information [Line Items] |  |  |  |  |
Other acquired intangible assets, net | $ 17,967 |  | $ 17,967 |  | $ 22,301
Goodwill | 121,223 |  | 121,223 |  | 121,719
Amortization of acquired intangible assets | 2,027 | $ 2,435 | 4,064 | $ 4,888 |
Operating Segments [Member] | Satellite Services [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Other acquired intangible assets, net | 8,550 |  | 8,550 |  | 10,453
Goodwill | 13,535 |  | 13,535 |  | 13,617
Amortization of acquired intangible assets | 850 | 1,289 | 1,705 | 2,593 |
Operating Segments [Member] | Commercial Networks [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Other acquired intangible assets, net | 1,028 |  | 1,028 |  | 1,798
Goodwill | 43,945 |  | 43,945 |  | 43,933
Amortization of acquired intangible assets | 386 | 385 | 772 | 771 |
Operating Segments [Member] | Government Systems [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Other acquired intangible assets, net | 8,389 |  | 8,389 |  | 10,050
Goodwill | 63,743 |  | 63,743 |  | $ 64,169
Amortization of acquired intangible assets | $ 791 | $ 761 | $ 1,587 | $ 1,524 |

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