Segment Information - Segment Revenues and Operating Profits (Losses) (Detail) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Mar. 31, 2021
Revenues:
Total revenues	$ 2,556,158	$ 2,417,179	$ 1,920,878
Operating profits (losses):
Income (loss) from operations	(155,956)	(113,141)	(45,953)
Amortization of acquired intangible assets	(29,811)	(28,729)	(5,482)
Product [Member]
Revenues:
Total revenues	954,126	860,726	739,373
Service [Member]
Revenues:
Total revenues	1,602,032	1,556,453	1,181,505
Operating Segments [Member]
Operating profits (losses):
Income (loss) from operations	(126,145)	(84,412)	(40,471)
Operating Segments [Member] | Satellite Services [Member]
Revenues:
Total revenues	1,210,733	1,188,816	868,943
Operating profits (losses):
Income (loss) from operations	(41,045)	31,559	26,263
Amortization of acquired intangible assets	(28,641)	(27,220)	(2,164)
Operating Segments [Member] | Satellite Services [Member] | Service [Member]
Revenues:
Total revenues	1,210,733	1,188,816	868,943
Operating Segments [Member] | Commercial Networks [Member]
Revenues:
Total revenues	612,647	512,099	320,856
Operating profits (losses):
Income (loss) from operations	(145,319)	(209,093)	(206,437)
Amortization of acquired intangible assets			(257)
Operating Segments [Member] | Commercial Networks [Member] | Product [Member]
Revenues:
Total revenues	530,374	443,435	268,830
Operating Segments [Member] | Commercial Networks [Member] | Service [Member]
Revenues:
Total revenues	82,273	68,664	52,026
Operating Segments [Member] | Government Systems [Member]
Revenues:
Total revenues	732,778	716,264	731,079
Operating profits (losses):
Income (loss) from operations	60,219	93,122	139,703
Amortization of acquired intangible assets	(1,170)	(1,509)	(3,061)
Operating Segments [Member] | Government Systems [Member] | Product [Member]
Revenues:
Total revenues	423,752	417,291	470,543
Operating Segments [Member] | Government Systems [Member] | Service [Member]
Revenues:
Total revenues	309,026	298,973	260,536
Material Reconciling Items [Member]
Operating profits (losses):
Amortization of acquired intangible assets	$ (29,811)	$ (28,729)	$ (5,482)