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, 2022	Mar. 31, 2021	Mar. 31, 2020
Segment Reporting Information [Line Items]
Other acquired intangible assets, net	$ 236,043	$ 9,568
Goodwill	190,113	122,300
Amortization of acquired intangible assets	28,729	5,482	$ 7,611
Operating Segments [Member] | Satellite Services [Member]
Segment Reporting Information [Line Items]
Other acquired intangible assets, net	233,740	5,738
Goodwill	81,972	13,814
Amortization of acquired intangible assets	27,220	2,164	2,897
Operating Segments [Member] | Commercial Networks [Member]
Segment Reporting Information [Line Items]
Goodwill	44,050	44,044
Amortization of acquired intangible assets		257	1,539
Operating Segments [Member] | Government Systems [Member]
Segment Reporting Information [Line Items]
Other acquired intangible assets, net	2,303	3,830
Goodwill	64,091	64,442
Amortization of acquired intangible assets	$ 1,509	$ 3,061	$ 3,175