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Segment Information - Other Acquired Intangible Assets, Net, Goodwill Included in Segment Assets and Depreciation and Amortization of Acquired Intangible Assets by Segment (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2024 | Dec. 31, 2023 | Mar. 31, 2024
Segment Reporting Information [Line Items] |  |  |  |  |
Other acquired intangible assets, net | $ 2,338,088 |  | $ 2,338,088 |  | $ 2,544,467
Goodwill | 1,620,267 |  | 1,620,267 |  | 1,621,763
Depreciation and amortization of intangible assets | 337,755 | $ 336,626 | 1,023,625 | $ 844,970 |
Operating Segments [Member] | Communication Services [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Other acquired intangible assets, net | 2,338,088 |  | 2,338,088 |  | 2,544,315
Goodwill | 1,580,480 |  | 1,580,480 |  | 1,581,937
Depreciation and amortization of intangible assets | 254,962 | 231,274 | 776,134 | 604,738 |
Operating Segments [Member] | Defense and Advanced Technologies [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Other acquired intangible assets, net |  |  |  |  | 152
Goodwill | 39,787 |  | 39,787 |  | $ 39,826
Depreciation and amortization of intangible assets | 16,946 | 13,633 | 49,405 | 39,328 |
Corporate, Non-Segment [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Depreciation and amortization of intangible assets | $ 65,847 | $ 91,719 | $ 198,086 | $ 200,904 |

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