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Segment Information - Segment Revenues, Expenses and Operating Profits (Losses) (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Revenues: |  |  |  |  |
Total revenues |  | $ 1,140,893 | $ 1,122,262 | $ 2,311,947 | $ 2,248,722
Operating Expenses [Abstract] |  |  |  |  |
Depreciation |  |  |  | 510,371 | 522,601
Stock-based compensation expense |  |  |  | 34,829 | 41,965
Total expenses |  | 1,040,049 | 1,080,916 | 2,098,690 | 2,081,426
Operating profits (losses): |  |  |  |  |
Amortization of acquired intangible assets |  | (65,069) | (66,024) | (130,810) | (132,239)
Interest income |  | 12,525 | 23,896 | 26,815 | 46,688
Interest expense |  | (93,487) | (115,340) | (193,844) | (221,116)
(Loss) gain on extinguishment of debt, net |  |  | (3,200) | (288) | (3,200)
Other income (expense), net |  |  |  | (5,164) |
Income (loss) before income taxes |  | (45,187) | (119,322) | (90,034) | (142,571)
Income (loss) from operations |  | 35,775 | (24,678) | 82,447 | 35,057
Product [Member] |  |  |  |  |
Revenues: |  |  |  |  |
Total revenues |  | 319,383 | 323,948 | 664,067 | 629,687
Service [Member] |  |  |  |  |
Revenues: |  |  |  |  |
Total revenues |  | 821,510 | 798,314 | 1,647,880 | 1,619,035
Operating Segments [Member] |  |  |  |  |
Operating profits (losses): |  |  |  |  |
Income (loss) from operations |  | 100,844 | 41,346 | 213,257 | 167,296
Operating Segments [Member] | Communication Services [Member] |  |  |  |  |
Revenues: |  |  |  |  |
Total revenues |  | 836,655 | 826,385 | 1,664,026 | 1,653,172
Operating Expenses [Abstract] |  |  |  |  |
Depreciation |  | 240,219 | 261,070 | 486,968 | 499,463
Stock-based compensation expense |  | 12,490 | 13,483 | 20,802 | 25,578
Other than acquired intangible assets amortization | [1] | 4,739 | 10,969 | 18,748 | 21,709
Acquisition and transaction related expenses |  | 3,480 | 29,685 | 11,354 | 31,471
Other segment items | [2] | 504,342 | 511,645 | 1,013,893 | 1,033,479
Total expenses | [3] | 765,270 | 826,852 | 1,551,765 | 1,611,700
Operating profits (losses): |  |  |  |  |
Income (loss) from operations |  | 71,385 | (467) | 112,261 | 41,472
Operating Segments [Member] | Communication Services [Member] | Government Satcom Services [Member] |  |  |  |  |
Revenues: |  |  |  |  |
Total revenues |  | 195,800 | 179,875 | 387,568 | 363,748
Operating Segments [Member] | Communication Services [Member] | Aviation Services [Member] |  |  |  |  |
Revenues: |  |  |  |  |
Total revenues |  | 300,732 | 261,987 | 593,624 | 519,142
Operating Segments [Member] | Communication Services [Member] | Maritime Services [Member] |  |  |  |  |
Revenues: |  |  |  |  |
Total revenues |  | 117,594 | 121,179 | 235,395 | 245,126
Operating Segments [Member] | Communication Services [Member] | Fixed Services and Other Services [Member] |  |  |  |  |
Revenues: |  |  |  |  |
Total revenues |  | 155,691 | 184,853 | 330,428 | 386,489
Operating Segments [Member] | Communication Services [Member] | Product [Member] |  |  |  |  |
Revenues: |  |  |  |  |
Total revenues |  | 66,838 | 78,491 | 117,011 | 138,667
Operating Segments [Member] | Communication Services [Member] | Service [Member] |  |  |  |  |
Revenues: |  |  |  |  |
Total revenues |  | 769,817 | 747,894 | 1,547,015 | 1,514,505
Operating Segments [Member] | Defense and Advanced Technologies [Member] |  |  |  |  |
Revenues: |  |  |  |  |
Total revenues |  | 304,238 | 295,877 | 647,921 | 595,550
Operating Expenses [Abstract] |  |  |  |  |
Depreciation |  | 12,451 | 11,731 | 23,403 | 23,138
Stock-based compensation expense |  | 7,632 | 9,300 | 14,027 | 16,387
Other than acquired intangible assets amortization | [1] | 6,650 | 4,872 | 11,543 | 9,321
Acquisition and transaction related expenses |  | 1,600 | 4,865 | 3,451 | 5,380
Other segment items | [2] | 246,446 | 223,296 | 494,501 | 415,500
Total expenses | [3] | 274,779 | 254,064 | 546,925 | 469,726
Operating profits (losses): |  |  |  |  |
Income (loss) from operations |  | 29,459 | 41,813 | 100,996 | 125,824
Operating Segments [Member] | Defense and Advanced Technologies [Member] | Information Security and Cyber Defense Products [Member] |  |  |  |  |
Revenues: |  |  |  |  |
Total revenues |  | 94,928 | 83,548 | 197,076 | 139,055
Operating Segments [Member] | Defense and Advanced Technologies [Member] | Space and Mission Systems Products [Member] |  |  |  |  |
Revenues: |  |  |  |  |
Total revenues |  | 78,231 | 78,782 | 166,204 | 152,088
Operating Segments [Member] | Defense and Advanced Technologies [Member] | Tactical Networking Products [Member] |  |  |  |  |
Revenues: |  |  |  |  |
Total revenues |  | 74,193 | 80,034 | 142,472 | 151,444
Operating Segments [Member] | Defense and Advanced Technologies [Member] | Advanced Technologies and Other Products [Member] |  |  |  |  |
Revenues: |  |  |  |  |
Total revenues |  | 5,193 | 3,093 | 41,304 | 48,433
Operating Segments [Member] | Defense and Advanced Technologies [Member] | Product [Member] |  |  |  |  |
Revenues: |  |  |  |  |
Total revenues |  | 252,545 | 245,457 | 547,056 | 491,020
Operating Segments [Member] | Defense and Advanced Technologies [Member] | Service [Member] |  |  |  |  |
Revenues: |  |  |  |  |
Total revenues |  | 51,693 | 50,420 | 100,865 | 104,530
Corporate, Non-Segment [Member] |  |  |  |  |
Operating profits (losses): |  |  |  |  |
Amortization of acquired intangible assets |  | (65,069) | (66,024) | (130,810) | (132,239)
Interest income |  | 12,525 | 23,896 | 26,815 | 46,688
Interest expense |  | $ (93,487) | (115,340) | (193,844) | (221,116)
(Loss) gain on extinguishment of debt, net |  |  | (3,200) | (288) | (3,200)
Other income (expense), net |  |  | $ 0 | $ (5,164) | $ 0
[1] | Including amortization of capitalized cloud computing implementation costs.
[2] | Other segment items include operating expenses such as cost of service and product revenues, selling, general and administrative expenses, IR&D expenses and related activities excluding allocable portion of depreciation, other than acquired intangibles amortization, stock-based compensation, and certain significant items that are disclosed under each segment.
[3] | For the three and six months ended September 30, 2025, IR&D expense and related activities, including allocable depreciation, stock-based compensation and other expenses w ere $21.7 million and $40.8 million, respectively, for the communication services segment, and $20.6 million and $35.6 million, resp ectively, for the defense and advanced technologies segment. For the three and six months ended September 30, 2024, IR&D expense and related activities, including allocable depreciation, stock-based compensation and other expense s were $19.7 million and $45.5 million, respectively, for the communication services segment, and $13.7 million and $26.5 million, respectively, for the defen se and advanced technologies segment.

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