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Segment Information - Segment Revenues and Operating Profits (Losses) (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Revenues: |  |  |  |
Total revenues | $ 517,474 | $ 393,074 | $ 956,343 | $ 773,118
Operating profits (losses): |  |  |  |
Loss from operations | (21,571) | (15,860) | (76,050) | (33,810)
Amortization of acquired intangible assets | (2,435) | (3,320) | (4,888) | (6,580)
Product [Member] |  |  |  |
Revenues: |  |  |  |
Total revenues | 280,435 | 181,783 | 498,564 | 347,901
Service [Member] |  |  |  |
Revenues: |  |  |  |
Total revenues | 237,039 | 211,291 | 457,779 | 425,217
Operating Segments [Member] |  |  |  |
Operating profits (losses): |  |  |  |
Loss from operations | (19,136) | (12,540) | (71,162) | (27,230)
Operating Segments [Member] | Satellite Services [Member] |  |  |  |
Revenues: |  |  |  |
Total revenues | 162,962 | 147,578 | 316,523 | 299,792
Operating profits (losses): |  |  |  |
Loss from operations | (24,839) | 12,616 | (54,775) | 31,459
Amortization of acquired intangible assets | (1,289) | (2,173) | (2,593) | (4,267)
Operating Segments [Member] | Satellite Services [Member] | Product [Member] |  |  |  |
Revenues: |  |  |  |
Total revenues |  | 214 |  | 431
Operating Segments [Member] | Satellite Services [Member] | Service [Member] |  |  |  |
Revenues: |  |  |  |
Total revenues | 162,962 | 147,364 | 316,523 | 299,361
Operating Segments [Member] | Commercial Networks [Member] |  |  |  |
Revenues: |  |  |  |
Total revenues | 114,520 | 56,269 | 209,586 | 101,517
Operating profits (losses): |  |  |  |
Loss from operations | (39,197) | (59,377) | (86,205) | (125,502)
Amortization of acquired intangible assets | (385) | (386) | (771) | (792)
Operating Segments [Member] | Commercial Networks [Member] | Product [Member] |  |  |  |
Revenues: |  |  |  |
Total revenues | 104,190 | 47,347 | 189,323 | 83,830
Operating Segments [Member] | Commercial Networks [Member] | Service [Member] |  |  |  |
Revenues: |  |  |  |
Total revenues | 10,330 | 8,922 | 20,263 | 17,687
Operating Segments [Member] | Government Systems [Member] |  |  |  |
Revenues: |  |  |  |
Total revenues | 239,992 | 189,227 | 430,234 | 371,809
Operating profits (losses): |  |  |  |
Loss from operations | 44,900 | 34,221 | 69,818 | 66,813
Amortization of acquired intangible assets | (761) | (761) | (1,524) | (1,521)
Operating Segments [Member] | Government Systems [Member] | Product [Member] |  |  |  |
Revenues: |  |  |  |
Total revenues | 176,245 | 134,222 | 309,241 | 263,640
Operating Segments [Member] | Government Systems [Member] | Service [Member] |  |  |  |
Revenues: |  |  |  |
Total revenues | 63,747 | 55,005 | 120,993 | 108,169
Material Reconciling Items [Member] |  |  |  |
Operating profits (losses): |  |  |  |
Amortization of acquired intangible assets | $ (2,435) | $ (3,320) | $ (4,888) | $ (6,580)

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