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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 | 6 Months Ended |
--- | --- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023 | Mar. 31, 2024
Segment Reporting Information [Line Items] |  |  |  |  |
Other acquired intangible assets, net | $ 2,410,852 |  | $ 2,410,852 |  | $ 2,544,467
Goodwill | 1,623,760 |  | 1,623,760 |  | 1,621,763
Depreciation and amortization of intangible assets | 354,666 | $ 333,765 | 685,870 | $ 508,344 |
Operating Segments [Member] | Communication Services [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Other acquired intangible assets, net | 2,410,852 |  | 2,410,852 |  | 2,544,315
Goodwill | 1,583,374 |  | 1,583,374 |  | 1,581,937
Depreciation and amortization of intangible assets | 272,039 | 238,681 | 521,172 | 373,464 |
Operating Segments [Member] | Defense and Advanced Technologies [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Other acquired intangible assets, net |  |  |  |  | 152
Goodwill | 40,386 |  | 40,386 |  | $ 39,826
Depreciation and amortization of intangible assets | 16,603 | 13,710 | 32,459 | 25,695 |
Corporate, Non-Segment [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Depreciation and amortization of intangible assets | $ 66,024 | $ 81,374 | $ 132,239 | $ 109,185 |

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