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, 2023	Mar. 31, 2022	Mar. 31, 2021
Segment Reporting Information [Line Items]
Other acquired intangible assets, net	$ 201,205	$ 236,043
Goodwill	158,542	168,710
Amortization of acquired intangible assets	29,811	28,729	$ 5,482
Operating Segments [Member] | Satellite Services [Member]
Segment Reporting Information [Line Items]
Other acquired intangible assets, net	200,097	233,740
Goodwill	80,589	81,972
Amortization of acquired intangible assets	28,641	27,220	2,164
Operating Segments [Member] | Commercial Networks [Member]
Segment Reporting Information [Line Items]
Goodwill	41,014	44,050
Amortization of acquired intangible assets			257
Operating Segments [Member] | Government Systems [Member]
Segment Reporting Information [Line Items]
Other acquired intangible assets, net	1,108	2,303
Goodwill	36,939	42,688
Amortization of acquired intangible assets	$ 1,170	$ 1,509	$ 3,061