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		9 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2022	Dec. 31, 2021	Mar. 31, 2022
Segment Reporting Information [Line Items]
Other acquired intangible assets, net	$ 207,174		$ 207,174		$ 236,043
Goodwill	166,293		166,293		168,710
Amortization of acquired intangible assets	7,433	$ 7,531	22,335	$ 20,859
Operating Segments [Member] | Satellite Services [Member]
Segment Reporting Information [Line Items]
Other acquired intangible assets, net	205,776		205,776		233,740
Goodwill	79,947		79,947		81,972
Amortization of acquired intangible assets	7,142	7,231	21,458	19,650
Operating Segments [Member] | Commercial Networks [Member]
Segment Reporting Information [Line Items]
Goodwill	44,056		44,056		44,050
Operating Segments [Member] | Government Systems [Member]
Segment Reporting Information [Line Items]
Other acquired intangible assets, net	1,398		1,398		2,303
Goodwill	42,290		42,290		$ 42,688
Amortization of acquired intangible assets	$ 291	$ 300	$ 877	$ 1,209