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Segment Information - Segment Revenues and Operating Profits (Losses) (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Mar. 31, 2018 | Mar. 31, 2017 | Mar. 31, 2016
Revenues: |  |  |
Product revenues | $ 755,547 | $ 713,936 | $ 664,821
Service revenues | 839,078 | 845,401 | 752,610
Total revenues | 1,594,625 | 1,559,337 | 1,417,431
Operating profits (losses): |  |  |
(Loss) income from operations | (92,187) | 36,459 | 41,119
Amortization of acquired intangible assets | (12,231) | (10,788) | (16,438)
Operating Segments [Member] |  |  |
Operating profits (losses): |  |  |
(Loss) income from operations | (79,956) | 47,247 | 57,557
Operating Segments [Member] | Satellite Services [Member] |  |  |
Revenues: |  |  |
Product revenues | 664 | 27,711 | 25,606
Service revenues | 588,623 | 601,936 | 533,628
Total revenues | 589,287 | 629,647 | 559,234
Operating profits (losses): |  |  |
(Loss) income from operations | 12,018 | 131,085 | 81,830
Amortization of acquired intangible assets | (7,622) | (5,866) | (9,122)
Operating Segments [Member] | Commercial Networks [Member] |  |  |
Revenues: |  |  |
Product revenues | 198,034 | 211,458 | 228,694
Service revenues | 35,187 | 33,149 | 22,042
Total revenues | 233,221 | 244,607 | 250,736
Operating profits (losses): |  |  |
(Loss) income from operations | (229,105) | (180,496) | (111,339)
Amortization of acquired intangible assets | (1,563) | (1,679) | (2,569)
Operating Segments [Member] | Government Systems [Member] |  |  |
Revenues: |  |  |
Product revenues | 556,849 | 474,767 | 410,521
Service revenues | 215,268 | 210,316 | 196,940
Total revenues | 772,117 | 685,083 | 607,461
Operating profits (losses): |  |  |
(Loss) income from operations | 137,131 | 96,658 | 87,066
Amortization of acquired intangible assets | (3,046) | (3,243) | (4,747)
Material Reconciling Items [Member] |  |  |
Operating profits (losses): |  |  |
Amortization of acquired intangible assets | $ (12,231) | $ (10,788) | $ (16,438)

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