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	12 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Mar. 31, 2022
Segment Reporting Information [Line Items]
Other acquired intangible assets, net	$ 2,544,467	$ 201,205
Goodwill	1,621,763	158,542
Amortization of acquired intangible assets	227,165	29,811	$ 28,729
Operating Segments [Member] | Satellite Services [Member]
Segment Reporting Information [Line Items]
Other acquired intangible assets, net	2,174,628	200,097
Goodwill	1,055,929	80,589
Amortization of acquired intangible assets	197,563	28,641	27,220
Operating Segments [Member] | Commercial Networks [Member]
Segment Reporting Information [Line Items]
Goodwill	41,048	41,014
Operating Segments [Member] | Government Systems [Member]
Segment Reporting Information [Line Items]
Other acquired intangible assets, net	369,839	1,108
Goodwill	524,786	36,939
Amortization of acquired intangible assets	$ 29,602	$ 1,170	$ 1,509