Composition of Certain Balance Sheet Captions - Composition of Certain Balance Sheet Captions (Detail) - USD ($) $ in Thousands	Sep. 30, 2023	Mar. 31, 2023
Accounts receivable, net:
Accounts receivable, Billed	$ 516,488	$ 327,148
Accounts receivable, Unbilled	164,643	104,889
Allowance for doubtful accounts	(16,649)	(12,103)
Accounts receivable, net	664,482	419,934
Inventories:
Raw materials	102,415	68,655
Work in process	31,534	25,347
Finished goods	211,653	174,561
Inventories	345,602	268,563
Prepaid expenses and other current assets:
Insurance receivable	770,000
Prepaid expenses	157,646	115,701
Other	152,697	60,928
Prepaid expenses and other current assets	1,080,343	176,629
Property, equipment and satellites, net:
Property, equipment and satellites, gross	10,361,252	6,710,243
Less: accumulated depreciation and amortization	(2,653,196)	(2,331,960)
Property and equipment, net	7,708,056	4,378,283
Other acquired intangible assets, net:
Other acquired intangible assets, gross	3,025,764	346,525
Less: accumulated amortization	(253,927)	(145,320)
Other acquired intangible assets, net	2,771,837	201,205
Other assets:
Deferred income taxes	183,151	23,724
Capitalized software costs, net	224,712	222,155
Patents, orbital slots and other licenses, net	77,085	73,932
Other	249,508	146,227
Other assets	734,456	466,038
Accrued and other liabilities:
Collections in excess of revenues and deferred revenues	271,321	132,187
Accrued employee compensation	151,389	125,349
Accrued vacation	51,436	45,177
Operating lease liabilities	$ 65,942	$ 50,639
Operating Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration]	Accrued and other liabilities	Accrued and other liabilities
Income taxes payable	$ 141,182	$ 113,905
Other	416,914	179,975
Accrued and other liabilities	1,098,184	647,232
Other liabilities:
Deferred revenues, long-term portion	920,470	84,747
Deferred income taxes, long-term	1,401,904	85,989
Other	346,748	47,806
Other liabilities	2,669,122	218,542
Contracts and Customer Relationships [Member]
Other acquired intangible assets, net:
Other acquired intangible assets, gross	1,287,129	132,563
Orbital Slots And Spectrum Assets [Member]
Other acquired intangible assets, net:
Other acquired intangible assets, gross	1,018,600	8,600
Technology [Member]
Other acquired intangible assets, net:
Other acquired intangible assets, gross	256,128	151,327
Trade Name [Member]
Other acquired intangible assets, net:
Other acquired intangible assets, gross	122,250	32,253
Other [Member]
Other acquired intangible assets, net:
Other acquired intangible assets, gross	341,657	21,782
Satellites [Member]
Prepaid expenses and other current assets:
Insurance receivable	770,000
Property, equipment and satellites, net:
Property, equipment and satellites, gross	3,225,201	1,056,313
Satellites under Construction [Member]
Property, equipment and satellites, net:
Property, equipment and satellites, gross	1,700,090	2,252,908
Equipment and Software [Member]
Property, equipment and satellites, net:
Property, equipment and satellites, gross	3,202,111	1,917,243
CPE Leased Equipment [Member]
Property, equipment and satellites, net:
Property, equipment and satellites, cost	678,679	395,427
Satellite Ka-band Capacity Obtained under Finance Leases [Member]
Property, equipment and satellites, net:
Property, equipment and satellites, gross	177,581	175,712
Furniture and Fixtures [Member]
Property, equipment and satellites, net:
Property, equipment and satellites, gross	63,291	58,807
Leasehold Improvements [Member]
Property, equipment and satellites, net:
Property, equipment and satellites, gross	182,765	151,827
Buildings [Member]
Property, equipment and satellites, net:
Property, equipment and satellites, gross	16,247	12,487
Land [Member]
Property, equipment and satellites, net:
Property, equipment and satellites, gross	29,388	3,873
Construction in Progress [Member]
Property, equipment and satellites, net:
Property, equipment and satellites, gross	$ 1,085,899	$ 685,646