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Segment Information - Segment Revenues and Operating Profits (Losses) (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2024 | Dec. 31, 2023
Revenues: |  |  |  |
Total revenues | $ 1,123,767 | $ 1,128,539 | $ 3,372,489 | $ 3,133,745
Operating profits (losses): |  |  |  |
Income (loss) from operations | 21,248 | (43,918) | 56,305 | (890,101)
Amortization of acquired intangible assets | (65,847) | (91,719) | (198,086) | (200,904)
Product [Member] |  |  |  |
Revenues: |  |  |  |
Total revenues | 314,397 | 303,073 | 944,084 | 941,174
Service [Member] |  |  |  |
Revenues: |  |  |  |
Total revenues | 809,370 | 825,466 | 2,428,405 | 2,192,571
Operating Segments [Member] |  |  |  |
Operating profits (losses): |  |  |  |
Income (loss) from operations | 87,095 | 47,801 | 254,391 | (689,197)
Operating Segments [Member] | Communication Services [Member] |  |  |  |
Revenues: |  |  |  |
Total revenues | 820,347 | 874,858 | 2,473,519 | 2,281,675
Operating profits (losses): |  |  |  |
Income (loss) from operations | 44,357 | 36,049 | 85,829 | (805,080)
Operating Segments [Member] | Communication Services [Member] | Government Satcom Services [Member] |  |  |  |
Revenues: |  |  |  |
Total revenues | 195,048 | 176,311 | 558,796 | 428,778
Operating Segments [Member] | Communication Services [Member] | Aviation Services [Member] |  |  |  |
Revenues: |  |  |  |
Total revenues | 263,880 | 236,008 | 783,022 | 611,169
Operating Segments [Member] | Communication Services [Member] | Maritime Services [Member] |  |  |  |
Revenues: |  |  |  |
Total revenues | 118,895 | 130,121 | 364,021 | 305,894
Operating Segments [Member] | Communication Services [Member] | Fixed Services and Other Services [Member] |  |  |  |
Revenues: |  |  |  |
Total revenues | 181,162 | 229,929 | 567,651 | 691,063
Operating Segments [Member] | Communication Services [Member] | Product [Member] |  |  |  |
Revenues: |  |  |  |
Total revenues | 61,362 | 102,489 | 200,029 | 244,771
Operating Segments [Member] | Communication Services [Member] | Service [Member] |  |  |  |
Revenues: |  |  |  |
Total revenues | 758,985 | 772,369 | 2,273,490 | 2,036,904
Operating Segments [Member] | Defense and Advanced Technologies [Member] |  |  |  |
Revenues: |  |  |  |
Total revenues | 303,420 | 253,681 | 898,970 | 852,070
Operating profits (losses): |  |  |  |
Income (loss) from operations | 42,738 | 11,752 | 168,562 | 115,883
Operating Segments [Member] | Defense and Advanced Technologies [Member] | Information Security and Cyber Defense Products [Member] |  |  |  |
Revenues: |  |  |  |
Total revenues | 89,497 | 72,115 | 228,552 | 211,169
Operating Segments [Member] | Defense and Advanced Technologies [Member] | Space and Mission Systems Products [Member] |  |  |  |
Revenues: |  |  |  |
Total revenues | 77,752 | 65,182 | 229,840 | 229,875
Operating Segments [Member] | Defense and Advanced Technologies [Member] | Tactical Networking Products [Member] |  |  |  |
Revenues: |  |  |  |
Total revenues | 78,528 | 57,676 | 229,972 | 137,505
Operating Segments [Member] | Defense and Advanced Technologies [Member] | Advanced Technologies and Other Products [Member] |  |  |  |
Revenues: |  |  |  |
Total revenues | 7,258 | 5,611 | 55,691 | 117,854
Operating Segments [Member] | Defense and Advanced Technologies [Member] | Product [Member] |  |  |  |
Revenues: |  |  |  |
Total revenues | 253,035 | 200,584 | 744,055 | 696,403
Operating Segments [Member] | Defense and Advanced Technologies [Member] | Service [Member] |  |  |  |
Revenues: |  |  |  |
Total revenues | 50,385 | 53,097 | 154,915 | 155,667
Material Reconciling Items [Member] |  |  |  |
Operating profits (losses): |  |  |  |
Amortization of acquired intangible assets | $ (65,847) | $ (91,719) | $ (198,086) | $ (200,904)

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