Composition of Certain Balance Sheet Captions - Composition of Certain Balance Sheet Captions (Detail) - USD ($) $ in Thousands	Dec. 31, 2023	Mar. 31, 2023
Accounts receivable, net:
Accounts receivable, Billed	$ 550,000	$ 327,148
Accounts receivable, Unbilled	148,064	104,889
Allowance for doubtful accounts	(22,218)	(12,103)
Accounts receivable, net	675,846	419,934
Inventories:
Raw materials	93,722	68,655
Work in process	40,202	25,347
Finished goods	219,627	174,561
Inventories	353,551	268,563
Prepaid expenses and other current assets:
Insurance receivable	770,000
Prepaid expenses	154,254	115,701
Other	131,429	60,928
Prepaid expenses and other current assets	1,055,683	176,629
Property, equipment and satellites, net:
Property, equipment and satellites, gross	10,231,095	6,710,243
Less: accumulated depreciation and amortization	(2,856,753)	(2,331,960)
Property and equipment, net	7,374,342	4,378,283
Other acquired intangible assets, net:
Other acquired intangible assets, gross	3,121,451	346,525
Less: accumulated amortization	(347,786)	(145,320)
Other acquired intangible assets, net	2,773,665	201,205
Other assets:
Deferred income taxes	181,072	23,724
Capitalized software costs, net	235,064	222,155
Patents, orbital slots and other licenses, net	103,584	73,932
Other	224,547	146,227
Other assets	744,267	466,038
Accrued and other liabilities:
Collections in excess of revenues and deferred revenues	266,147	132,187
Accrued employee compensation	170,348	125,349
Accrued vacation	45,595	45,177
Operating lease liabilities	$ 75,002	$ 50,639
Operating Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration]	Accrued and other liabilities	Accrued and other liabilities
Income taxes payable	$ 39,007	$ 113,905
Other	402,969	179,975
Accrued and other liabilities	999,068	647,232
Other liabilities:
Deferred revenues, long-term portion	905,373	84,747
Deferred income taxes, long-term	1,292,495	85,989
Other	324,281	47,806
Other liabilities	2,522,149	218,542
Contracts and Customer Relationships [Member]
Other acquired intangible assets, net:
Other acquired intangible assets, gross	1,478,672	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	253,414	151,327
Trade Name [Member]
Other acquired intangible assets, net:
Other acquired intangible assets, gross	117,390	32,253
Other [Member]
Other acquired intangible assets, net:
Other acquired intangible assets, gross	253,375	21,782
Satellites [Member]
Prepaid expenses and other current assets:
Insurance receivable	770,000
Property, equipment and satellites, net:
Property, equipment and satellites, gross	3,349,663	1,056,313
Satellites under Construction [Member]
Property, equipment and satellites, net:
Property, equipment and satellites, gross	1,863,690	2,252,908
Equipment and Software [Member]
Property, equipment and satellites, net:
Property, equipment and satellites, gross	2,644,427	1,917,243
CPE Leased Equipment [Member]
Property, equipment and satellites, net:
Property, equipment and satellites, cost	585,205	395,427
Satellite Ka-band Capacity Obtained under Finance Leases [Member]
Property, equipment and satellites, net:
Property, equipment and satellites, gross	177,576	175,712
Furniture and Fixtures [Member]
Property, equipment and satellites, net:
Property, equipment and satellites, gross	62,701	58,807
Leasehold Improvements [Member]
Property, equipment and satellites, net:
Property, equipment and satellites, gross	176,658	151,827
Buildings [Member]
Property, equipment and satellites, net:
Property, equipment and satellites, gross	16,755	12,487
Land [Member]
Property, equipment and satellites, net:
Property, equipment and satellites, gross	29,498	3,873
Construction in Progress [Member]
Property, equipment and satellites, net:
Property, equipment and satellites, gross	$ 1,324,922	$ 685,646