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Segment Information - Segment Revenues and Operating Profits (Losses) (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017
Revenues: |  |  |  |
Total revenues | $ 554,694 | $ 381,837 | $ 1,511,037 | $ 1,154,955
Operating profits (losses): |  |  |  |
Income (loss) from operations | 6,007 | (25,326) | (70,043) | (59,136)
Amortization of acquired intangible assets | (2,487) | (3,177) | (7,375) | (9,757)
Product [Member] |  |  |  |
Revenues: |  |  |  |
Total revenues | 301,865 | 175,957 | 800,429 | 523,858
Service [Member] |  |  |  |
Revenues: |  |  |  |
Total revenues | 252,829 | 205,880 | 710,608 | 631,097
Operating Segments [Member] |  |  |  |
Operating profits (losses): |  |  |  |
Income (loss) from operations | 8,494 | (22,149) | (62,668) | (49,379)
Operating Segments [Member] | Satellite Services [Member] |  |  |  |
Revenues: |  |  |  |
Total revenues | 177,651 | 144,543 | 494,174 | 444,335
Operating profits (losses): |  |  |  |
Income (loss) from operations | (10,196) | 1,681 | (64,971) | 33,140
Amortization of acquired intangible assets | (1,183) | (2,031) | (3,776) | (6,297)
Operating Segments [Member] | Satellite Services [Member] | Product [Member] |  |  |  |
Revenues: |  |  |  |
Total revenues |  | 233 |  | 664
Operating Segments [Member] | Satellite Services [Member] | Service [Member] |  |  |  |
Revenues: |  |  |  |
Total revenues | 177,651 | 144,310 | 494,174 | 443,671
Operating Segments [Member] | Commercial Networks [Member] |  |  |  |
Revenues: |  |  |  |
Total revenues | 126,977 | 55,536 | 336,563 | 157,053
Operating profits (losses): |  |  |  |
Income (loss) from operations | (31,219) | (53,505) | (117,424) | (179,007)
Amortization of acquired intangible assets | (386) | (385) | (1,157) | (1,178)
Operating Segments [Member] | Commercial Networks [Member] | Product [Member] |  |  |  |
Revenues: |  |  |  |
Total revenues | 115,409 | 47,073 | 304,732 | 130,903
Operating Segments [Member] | Commercial Networks [Member] | Service [Member] |  |  |  |
Revenues: |  |  |  |
Total revenues | 11,568 | 8,463 | 31,831 | 26,150
Operating Segments [Member] | Government Systems [Member] |  |  |  |
Revenues: |  |  |  |
Total revenues | 250,066 | 181,758 | 680,300 | 553,567
Operating profits (losses): |  |  |  |
Income (loss) from operations | 49,909 | 29,675 | 119,727 | 96,488
Amortization of acquired intangible assets | (918) | (761) | (2,442) | (2,282)
Operating Segments [Member] | Government Systems [Member] | Product [Member] |  |  |  |
Revenues: |  |  |  |
Total revenues | 186,456 | 128,651 | 495,697 | 392,291
Operating Segments [Member] | Government Systems [Member] | Service [Member] |  |  |  |
Revenues: |  |  |  |
Total revenues | 63,610 | 53,107 | 184,603 | 161,276
Material Reconciling Items [Member] |  |  |  |
Operating profits (losses): |  |  |  |
Amortization of acquired intangible assets | $ (2,487) | $ (3,177) | $ (7,375) | $ (9,757)

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