Composition of Certain Balance Sheet Captions - Composition of Certain Balance Sheet Captions (Detail) - USD ($) $ in Thousands	Dec. 31, 2022	Mar. 31, 2022
Accounts receivable, net:
Accounts receivable, Billed	$ 290,733	$ 233,948
Accounts receivable, Unbilled	92,600	85,383
Allowance for doubtful accounts	(14,506)	(7,159)
Accounts receivable, net	368,827	312,172
Inventories:
Raw materials	83,939	62,520
Work in process	23,285	21,702
Finished goods	153,662	113,642
Inventories	260,886	197,864
Prepaid expenses and other current assets:
Prepaid expenses	97,544	102,433
Other	59,388	38,953
Prepaid expenses and other current assets	156,932	141,386
Property, equipment and satellites, net:
Property, equipment and satellites, gross	6,446,566	5,719,303
Less: accumulated depreciation and amortization	(2,248,433)	(2,014,312)
Property and equipment, net	4,198,133	3,704,991
Other acquired intangible assets, net:
Other acquired intangible assets, gross	374,108	382,585
Less: accumulated amortization	(166,934)	(146,542)
Other acquired intangible assets, net	207,174	236,043
Other assets:
Deferred income taxes	230,295	304,642
Capitalized software costs, net	220,417	217,159
Patents, orbital slots and other licenses, net	74,060	62,200
Other	142,975	115,279
Other assets	667,747	699,280
Accrued and other liabilities:
Collections in excess of revenues and deferred revenues	115,509	131,623
Accrued employee compensation	77,633	108,456
Accrued vacation	41,444	48,097
Warranty reserve, current portion	2,952	2,804
Operating lease liabilities	$ 51,627	$ 49,988
Operating Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration]	Accrued and other liabilities	Accrued and other liabilities
Other	$ 156,568	$ 141,596
Accrued and other liabilities	445,733	482,564
Other liabilities:
Deferred revenues, long-term portion	87,343	88,983
Warranty reserve, long-term portion	2,463	2,548
Satellite performance incentive obligations, long-term portion	15,696	18,651
Deferred income taxes, long-term	14,216	16,869
Other	28,577	26,105
Other liabilities	148,295	153,156
Technology [Member]
Other acquired intangible assets, net:
Other acquired intangible assets, gross	149,810	154,624
Contracts and Customer Relationships [Member]
Other acquired intangible assets, net:
Other acquired intangible assets, gross	161,901	164,635
Satellite Co-Location Rights [Member]
Other acquired intangible assets, net:
Other acquired intangible assets, gross	8,600	8,600
Trade Name [Member]
Other acquired intangible assets, net:
Other acquired intangible assets, gross	32,126	32,463
Other [Member]
Other acquired intangible assets, net:
Other acquired intangible assets, gross	21,671	22,263
Satellites [Member]
Property, equipment and satellites, net:
Property, equipment and satellites, gross	1,054,983	1,059,182
Satellites under Construction [Member]
Property, equipment and satellites, net:
Property, equipment and satellites, gross	2,144,102	1,808,474
Equipment and Software [Member]
Property, equipment and satellites, net:
Property, equipment and satellites, gross	1,823,501	1,676,736
CPE Leased Equipment [Member]
Property, equipment and satellites, net:
Property, equipment and satellites, cost	385,356	395,539
Satellite Ka-band Capacity Obtained under Finance Leases [Member]
Property, equipment and satellites, net:
Property, equipment and satellites, gross	175,712	173,480
Furniture and Fixtures [Member]
Property, equipment and satellites, net:
Property, equipment and satellites, gross	59,219	57,847
Leasehold Improvements [Member]
Property, equipment and satellites, net:
Property, equipment and satellites, gross	151,816	149,982
Buildings [Member]
Property, equipment and satellites, net:
Property, equipment and satellites, gross	12,461	12,440
Land [Member]
Property, equipment and satellites, net:
Property, equipment and satellites, gross	3,849	3,944
Construction in Progress [Member]
Property, equipment and satellites, net:
Property, equipment and satellites, gross	$ 635,567	$ 381,679