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Segment Information - Segment Revenues and Operating Profits (Losses) (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2016 | Sep. 30, 2015
Revenues: |  |  |  |
Product revenues | $ 187,235 | $ 163,660 | $ 347,911 | $ 332,008
Service revenues | 211,923 | 189,670 | 414,377 | 365,700
Total revenues | 399,158 | 353,330 | 762,288 | 697,708
Operating profits (losses): |  |  |  |
Income from operations | 18,414 | 13,826 | 26,192 | 23,240
Amortization of acquired intangible assets | (2,277) | (4,587) | (4,790) | (9,397)
Operating Segments [Member] |  |  |  |
Operating profits (losses): |  |  |  |
Income from operations | 20,691 | 18,413 | 30,982 | 32,637
Operating Segments [Member] | Satellite Services [Member] |  |  |  |
Revenues: |  |  |  |
Product revenues | 6,782 | 6,376 | 13,467 | 12,652
Service revenues | 149,502 | 133,809 | 295,210 | 259,949
Total revenues | 156,284 | 140,185 | 308,677 | 272,601
Operating profits (losses): |  |  |  |
Income from operations | 32,550 | 21,036 | 63,417 | 38,077
Amortization of acquired intangible assets | (1,105) | (2,765) | (2,209) | (5,530)
Operating Segments [Member] | Commercial Networks [Member] |  |  |  |
Revenues: |  |  |  |
Product revenues | 58,445 | 61,983 | 117,041 | 123,494
Service revenues | 7,018 | 4,387 | 13,975 | 9,631
Total revenues | 65,463 | 66,370 | 131,016 | 133,125
Operating profits (losses): |  |  |  |
Income from operations | (40,868) | (22,306) | (79,399) | (41,039)
Amortization of acquired intangible assets | (411) | (755) | (856) | (1,251)
Operating Segments [Member] | Government Systems [Member] |  |  |  |
Revenues: |  |  |  |
Product revenues | 122,008 | 95,301 | 217,403 | 195,862
Service revenues | 55,403 | 51,474 | 105,192 | 96,120
Total revenues | 177,411 | 146,775 | 322,595 | 291,982
Operating profits (losses): |  |  |  |
Income from operations | 29,009 | 19,683 | 46,964 | 35,599
Amortization of acquired intangible assets | (761) | (1,067) | (1,725) | (2,616)
Material Reconciling Items [Member] |  |  |  |
Operating profits (losses): |  |  |  |
Amortization of acquired intangible assets | $ (2,277) | $ (4,587) | $ (4,790) | $ (9,397)

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