Segment Information - Other Acquired Intangible Assets, Net and Goodwill Included in Segment Assets and Amortization of Acquired Intangible Assets by Segment (Detail) - USD ($) $ in Thousands	3 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Mar. 31, 2023
Segment Reporting Information [Line Items]
Other acquired intangible assets, net	$ 2,546,130		$ 201,205
Goodwill	1,592,057		158,542
Amortization of acquired intangible assets	27,811	$ 7,523
Operating Segments [Member] | Satellite Services [Member]
Segment Reporting Information [Line Items]
Other acquired intangible assets, net	2,298,775		200,097
Goodwill	1,035,692		80,589
Amortization of acquired intangible assets	21,651	7,228
Operating Segments [Member] | Commercial Networks [Member]
Segment Reporting Information [Line Items]
Goodwill	41,061		41,014
Operating Segments [Member] | Government Systems [Member]
Segment Reporting Information [Line Items]
Other acquired intangible assets, net	247,355		1,108
Goodwill	515,304		$ 36,939
Amortization of acquired intangible assets	$ 6,160	$ 295