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
		Jun. 30, 2024	Jun. 30, 2023	Mar. 31, 2024
Segment Reporting Information [Line Items]
Other acquired intangible assets, net		$ 2,475,492		$ 2,544,467
Goodwill		1,621,473		1,621,763
Depreciation and amortization of intangible assets		331,204	$ 174,579
Operating Segments [Member] | Communication Services [Member]
Segment Reporting Information [Line Items]
Other acquired intangible assets, net		2,475,492		2,544,315
Goodwill		1,581,631		1,581,937
Depreciation and amortization of intangible assets		249,133	134,783
Operating Segments [Member] | Defense and Advanced Technologies [Member]
Segment Reporting Information [Line Items]
Other acquired intangible assets, net				152
Goodwill		39,842		$ 39,826
Depreciation and amortization of intangible assets		15,856	11,985
Corporate, Non-Segment [Member]
Segment Reporting Information [Line Items]
Depreciation and amortization of intangible assets	[1]	$ 66,215	$ 27,811

[1] Corporate amounts include the amortization of acquired intangible assets as they are not considered part of management’s evaluation of segment performance.