v3.26.1
Segment Information - Segment Revenues, Expenses and Operating Profits (Losses) (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Mar. 31, 2024
Revenues:      
Total revenues $ 4,640,280 $ 4,519,571 $ 4,283,758
Expenses:      
Depreciation 1,038,515 1,036,467 867,641
Stock-based compensation expense 81,070 80,385 83,631
Total expenses 4,271,443 4,353,118 4,946,399
Operating profits (losses):      
Income (loss) from operations 108,125 (97,480) (889,806)
Amortization of acquired intangible assets (260,712) (263,933) (227,165)
Interest income 205,849 83,920 96,258
Interest expense (360,250) (421,944) (400,398)
(Loss) gain on extinguishment of debt, net (11,935) (99,814)  
Other income (expense), net 163,012 (9,976)  
Income (loss) from continuing operations before income taxes 104,801 (545,294) (1,193,946)
Product [Member]      
Revenues:      
Total revenues 1,365,857 1,293,795 1,279,164
Service [Member]      
Revenues:      
Total revenues 3,274,423 3,225,776 3,004,594
Operating Segments [Member]      
Operating profits (losses):      
Income (loss) from operations 368,837 166,453 (662,641)
Operating Segments [Member] | Communication Services [Member]      
Revenues:      
Total revenues 3,299,651 3,298,485 3,141,540
Expenses:      
Depreciation 990,147 988,447 825,788
Stock-based compensation expense 48,685 48,760 52,662
Other than acquired intangibles amortization [1] 37,321 41,373 50,718
Acquisition and transaction related expenses 19,691 50,807 114,113
Other segment items [2] 2,051,254 2,049,920 2,009,817
Total expenses [3] 3,147,098 3,348,707 3,958,594
Operating profits (losses):      
Income (loss) from operations 152,553 (50,222) (817,054)
Operating Segments [Member] | Communication Services [Member] | Product [Member]      
Revenues:      
Total revenues 242,428 276,139 343,028
Operating Segments [Member] | Communication Services [Member] | Service [Member]      
Revenues:      
Total revenues 3,057,223 3,022,346 2,798,512
Operating Segments [Member] | Communication Services [Member] | Fixed services and other services [Member]      
Revenues:      
Total revenues 607,693 741,601 906,762
Operating Segments [Member] | Communication Services [Member] | Aviation Services [Member]      
Revenues:      
Total revenues 1,191,426 1,048,225 864,834
Operating Segments [Member] | Communication Services [Member] | Government Satcom Services [Member]      
Revenues:      
Total revenues 795,043 754,552 596,826
Operating Segments [Member] | Communication Services [Member] | Maritime Services [Member]      
Revenues:      
Total revenues 463,061 477,968 430,090
Operating Segments [Member] | Communication Services [Member] | Ground Network and Satellite [Member]      
Expenses:      
Ground network (FY25), satellite (FY24) impairment and related charges, net   169,400 905,496
Operating Segments [Member] | Defense and Advanced Technologies [Member]      
Revenues:      
Total revenues 1,340,629 1,221,086 1,142,218
Expenses:      
Depreciation 48,368 48,020 41,853
Stock-based compensation expense 32,385 31,625 30,969
Other than acquired intangibles amortization [1] 22,611 19,034 12,000
Acquisition and transaction related expenses 4,701 13,660 43,466
Other segment items 1,016,280 892,072 859,517
Total expenses [3] 1,124,345 1,004,411 987,805
Operating profits (losses):      
Income (loss) from operations 216,284 216,675 154,413
Operating Segments [Member] | Defense and Advanced Technologies [Member] | Product [Member]      
Revenues:      
Total revenues 1,123,429 1,017,656 936,136
Operating Segments [Member] | Defense and Advanced Technologies [Member] | Service [Member]      
Revenues:      
Total revenues 217,200 203,430 206,082
Operating Segments [Member] | Defense and Advanced Technologies [Member] | Advanced Technologies and Other Products [Member]      
Revenues:      
Total revenues 48,663 67,770 122,733
Operating Segments [Member] | Defense and Advanced Technologies [Member] | Information Security and Cyber Defense Products [Member]      
Revenues:      
Total revenues 414,482 325,439 302,056
Operating Segments [Member] | Defense and Advanced Technologies [Member] | Space and Mission Systems Products [Member]      
Revenues:      
Total revenues 330,867 304,870 309,253
Operating Segments [Member] | Defense and Advanced Technologies [Member] | Tactical Networking Products [Member]      
Revenues:      
Total revenues 329,417 319,577 202,094
Corporate, Non-Segment [Member]      
Operating profits (losses):      
Amortization of acquired intangible assets (260,712) (263,933) (227,165)
Interest income 205,849 83,920 96,258
Interest expense (360,250) (421,944) $ (400,398)
(Loss) gain on extinguishment of debt, net (11,935) (99,814)  
Other income (expense), net $ 163,012 $ (9,976)  
[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 fiscal years 2026, 2025, and 2024, IR&D expense and related activities, including allocable depreciation, stock-based compensation and other expenses were $93.1 million, $83.4 million and $105.0 million, respectively, for the communication services segment, and $71.8 million, $59.0 million and $45.7 million, respectively, for the defense and advanced technologies segment.