Segment Information - Segment Revenues and Operating Profits (Losses) (Detail) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Mar. 31, 2022
Revenues:
Total revenues	$ 4,283,758	$ 2,556,158	$ 2,417,179
Operating profits (losses):
Income (loss) from operations	(889,806)	(155,956)	(113,141)
Amortization of acquired intangible assets	(227,165)	(29,811)	(28,729)
Product [Member]
Revenues:
Total revenues	1,279,164	954,126	860,726
Service [Member]
Revenues:
Total revenues	3,004,594	1,602,032	1,556,453
Operating Segments [Member]
Operating profits (losses):
Income (loss) from operations	(662,641)	(126,145)	(84,412)
Operating Segments [Member] | Satellite Services [Member]
Revenues:
Total revenues	2,141,775	1,210,733	1,188,816
Operating profits (losses):
Income (loss) from operations	(770,883)	(41,045)	31,559
Amortization of acquired intangible assets	(197,563)	(28,641)	(27,220)
Operating Segments [Member] | Satellite Services [Member] | Service [Member]
Revenues:
Total revenues	2,141,775	1,210,733	1,188,816
Operating Segments [Member] | Commercial Networks [Member]
Revenues:
Total revenues	777,841	612,647	512,099
Operating profits (losses):
Income (loss) from operations	(134,956)	(145,319)	(209,093)
Operating Segments [Member] | Commercial Networks [Member] | Product [Member]
Revenues:
Total revenues	685,868	530,374	443,435
Operating Segments [Member] | Commercial Networks [Member] | Service [Member]
Revenues:
Total revenues	91,973	82,273	68,664
Operating Segments [Member] | Government Systems [Member]
Revenues:
Total revenues	1,364,142	732,778	716,264
Operating profits (losses):
Income (loss) from operations	243,198	60,219	93,122
Amortization of acquired intangible assets	(29,602)	(1,170)	(1,509)
Operating Segments [Member] | Government Systems [Member] | Product [Member]
Revenues:
Total revenues	593,296	423,752	417,291
Operating Segments [Member] | Government Systems [Member] | Service [Member]
Revenues:
Total revenues	770,846	309,026	298,973
Material Reconciling Items [Member]
Operating profits (losses):
Amortization of acquired intangible assets	$ (227,165)	$ (29,811)	$ (28,729)