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Segment Information - Segment Revenues and Operating Profits (Losses) (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023
Revenues: |  |  |  |
Total revenues | $ 1,122,262 | $ 1,225,415 | $ 2,248,722 | $ 2,005,206
Operating profits (losses): |  |  |  |
Income (loss) from operations | (24,678) | (804,667) | 35,057 | (846,183)
Amortization of acquired intangible assets | (66,024) | (81,374) | (132,239) | (109,185)
Product [Member] |  |  |  |
Revenues: |  |  |  |
Total revenues | 323,948 | 401,729 | 629,687 | 638,101
Service [Member] |  |  |  |
Revenues: |  |  |  |
Total revenues | 798,314 | 823,686 | 1,619,035 | 1,367,105
Operating Segments [Member] |  |  |  |
Operating profits (losses): |  |  |  |
Income (loss) from operations | 41,346 | (723,293) | 167,296 | (736,998)
Operating Segments [Member] | Communication Services [Member] |  |  |  |
Revenues: |  |  |  |
Total revenues | 826,385 | 846,557 | 1,653,172 | 1,406,817
Operating profits (losses): |  |  |  |
Income (loss) from operations | (467) | (831,186) | 41,472 | (841,129)
Operating Segments [Member] | Communication Services [Member] | Government Satcom Services [Member] |  |  |  |
Revenues: |  |  |  |
Total revenues | 179,875 | 169,843 | 363,748 | 252,467
Operating Segments [Member] | Communication Services [Member] | Aviation Services [Member] |  |  |  |
Revenues: |  |  |  |
Total revenues | 261,987 | 224,049 | 519,142 | 375,161
Operating Segments [Member] | Communication Services [Member] | Maritime Services [Member] |  |  |  |
Revenues: |  |  |  |
Total revenues | 121,179 | 130,428 | 245,126 | 175,773
Operating Segments [Member] | Communication Services [Member] | Fixed Services and Other Services [Member] |  |  |  |
Revenues: |  |  |  |
Total revenues | 184,853 | 246,442 | 386,489 | 461,134
Operating Segments [Member] | Communication Services [Member] | Product [Member] |  |  |  |
Revenues: |  |  |  |
Total revenues | 78,491 | 75,795 | 138,667 | 142,282
Operating Segments [Member] | Communication Services [Member] | Service [Member] |  |  |  |
Revenues: |  |  |  |
Total revenues | 747,894 | 770,762 | 1,514,505 | 1,264,535
Operating Segments [Member] | Defense and Advanced Technologies [Member] |  |  |  |
Revenues: |  |  |  |
Total revenues | 295,877 | 378,858 | 595,550 | 598,389
Operating profits (losses): |  |  |  |
Income (loss) from operations | 41,813 | 107,893 | 125,824 | 104,131
Operating Segments [Member] | Defense and Advanced Technologies [Member] | Information Security and Cyber Defense Products [Member] |  |  |  |
Revenues: |  |  |  |
Total revenues | 83,548 | 82,378 | 139,055 | 139,054
Operating Segments [Member] | Defense and Advanced Technologies [Member] | Space and Mission Systems Products [Member] |  |  |  |
Revenues: |  |  |  |
Total revenues | 78,782 | 92,306 | 152,088 | 164,693
Operating Segments [Member] | Defense and Advanced Technologies [Member] | Tactical Networking Products [Member] |  |  |  |
Revenues: |  |  |  |
Total revenues | 80,034 | 42,445 | 151,444 | 79,829
Operating Segments [Member] | Defense and Advanced Technologies [Member] | Advanced Technologies and Other Products [Member] |  |  |  |
Revenues: |  |  |  |
Total revenues | 3,093 | 108,805 | 48,433 | 112,243
Operating Segments [Member] | Defense and Advanced Technologies [Member] | Product [Member] |  |  |  |
Revenues: |  |  |  |
Total revenues | 245,457 | 325,934 | 491,020 | 495,819
Operating Segments [Member] | Defense and Advanced Technologies [Member] | Service [Member] |  |  |  |
Revenues: |  |  |  |
Total revenues | 50,420 | 52,924 | 104,530 | 102,570
Material Reconciling Items [Member] |  |  |  |
Operating profits (losses): |  |  |  |
Amortization of acquired intangible assets | $ (66,024) | $ (81,374) | $ (132,239) | $ (109,185)

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