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Segment Information - Segment Revenues and Operating Profits (Losses) (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016
Revenues: |  |  |  |
Product revenues | $ 181,783 | $ 187,235 | $ 347,901 | $ 347,911
Service revenues | 211,291 | 211,923 | 425,217 | 414,377
Total revenues | 393,074 | 399,158 | 773,118 | 762,288
Operating profits (losses): |  |  |  |
(Loss) income from operations | (15,860) | 18,414 | (33,810) | 26,192
Amortization of acquired intangible assets | (3,320) | (2,277) | (6,580) | (4,790)
Operating Segments [Member] |  |  |  |
Operating profits (losses): |  |  |  |
(Loss) income from operations | (12,540) | 20,691 | (27,230) | 30,982
Operating Segments [Member] | Satellite Services [Member] |  |  |  |
Revenues: |  |  |  |
Product revenues | 214 | 6,782 | 431 | 13,467
Service revenues | 147,364 | 149,502 | 299,361 | 295,210
Total revenues | 147,578 | 156,284 | 299,792 | 308,677
Operating profits (losses): |  |  |  |
(Loss) income from operations | 12,616 | 32,550 | 31,459 | 63,417
Amortization of acquired intangible assets | (2,173) | (1,105) | (4,267) | (2,209)
Operating Segments [Member] | Commercial Networks [Member] |  |  |  |
Revenues: |  |  |  |
Product revenues | 47,347 | 58,445 | 83,830 | 117,041
Service revenues | 8,922 | 7,018 | 17,687 | 13,975
Total revenues | 56,269 | 65,463 | 101,517 | 131,016
Operating profits (losses): |  |  |  |
(Loss) income from operations | (59,377) | (40,868) | (125,502) | (79,399)
Amortization of acquired intangible assets | (386) | (411) | (792) | (856)
Operating Segments [Member] | Government Systems [Member] |  |  |  |
Revenues: |  |  |  |
Product revenues | 134,222 | 122,008 | 263,640 | 217,403
Service revenues | 55,005 | 55,403 | 108,169 | 105,192
Total revenues | 189,227 | 177,411 | 371,809 | 322,595
Operating profits (losses): |  |  |  |
(Loss) income from operations | 34,221 | 29,009 | 66,813 | 46,964
Amortization of acquired intangible assets | (761) | (761) | (1,521) | (1,725)
Material Reconciling Items [Member] |  |  |  |
Operating profits (losses): |  |  |  |
Amortization of acquired intangible assets | $ (3,320) | $ (2,277) | $ (6,580) | $ (4,790)

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