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Segment Information - Segment Revenues and Operating Profits (Losses) (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2016 | Dec. 31, 2015
Revenues: |  |  |  |
Product revenues | $ 169,574 | $ 156,290 | $ 517,485 | $ 488,298
Service revenues | 211,056 | 191,469 | 625,433 | 557,169
Total revenues | 380,630 | 347,759 | 1,142,918 | 1,045,467
Operating profits (losses): |  |  |  |
Income from operations | 7,591 | 10,385 | 33,783 | 33,625
Amortization of acquired intangible assets | (2,775) | (4,261) | (7,565) | (13,658)
Operating Segments [Member] |  |  |  |
Operating profits (losses): |  |  |  |
Income from operations | 10,366 | 14,646 | 41,348 | 47,283
Operating Segments [Member] | Satellite Services [Member] |  |  |  |
Revenues: |  |  |  |
Product revenues | 7,114 | 6,453 | 20,581 | 19,105
Service revenues | 152,978 | 134,751 | 448,188 | 394,700
Total revenues | 160,092 | 141,204 | 468,769 | 413,805
Operating profits (losses): |  |  |  |
Income from operations | 34,846 | 21,772 | 98,263 | 59,849
Amortization of acquired intangible assets | (1,605) | (2,488) | (3,814) | (8,018)
Operating Segments [Member] | Commercial Networks [Member] |  |  |  |
Revenues: |  |  |  |
Product revenues | 46,878 | 49,617 | 163,919 | 173,111
Service revenues | 7,633 | 5,809 | 21,608 | 15,440
Total revenues | 54,511 | 55,426 | 185,527 | 188,551
Operating profits (losses): |  |  |  |
Income from operations | (48,598) | (29,889) | (127,997) | (70,928)
Amortization of acquired intangible assets | (411) | (706) | (1,267) | (1,957)
Operating Segments [Member] | Government Systems [Member] |  |  |  |
Revenues: |  |  |  |
Product revenues | 115,582 | 100,220 | 332,985 | 296,082
Service revenues | 50,445 | 50,909 | 155,637 | 147,029
Total revenues | 166,027 | 151,129 | 488,622 | 443,111
Operating profits (losses): |  |  |  |
Income from operations | 24,118 | 22,763 | 71,082 | 58,362
Amortization of acquired intangible assets | (759) | (1,067) | (2,484) | (3,683)
Material Reconciling Items [Member] |  |  |  |
Operating profits (losses): |  |  |  |
Amortization of acquired intangible assets | $ (2,775) | $ (4,261) | $ (7,565) | $ (13,658)

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