Composition of Certain Balance Sheet Captions - Composition of Certain Balance Sheet Captions (Detail) - USD ($) $ in Thousands	Sep. 30, 2022	Mar. 31, 2022
Accounts receivable, net:
Accounts receivable, Billed	$ 251,098	$ 233,948
Accounts receivable, Unbilled	83,000	85,383
Allowance for doubtful accounts	(13,849)	(7,159)
Accounts receivable, net	320,249	312,172
Inventories:
Raw materials	71,752	62,520
Work in process	23,066	21,702
Finished goods	149,466	113,642
Inventories	244,284	197,864
Prepaid expenses and other current assets:
Prepaid expenses	96,075	102,433
Other	52,047	38,953
Prepaid expenses and other current assets	148,122	141,386
Property, equipment and satellites, net:
Property, equipment and satellites, gross	6,158,766	5,719,303
Less: accumulated depreciation and amortization	(2,156,024)	(2,014,312)
Property and equipment, net	4,002,742	3,704,991
Other acquired intangible assets, net:
Other acquired intangible assets, gross	367,658	382,585
Less: accumulated amortization	(156,385)	(146,542)
Other acquired intangible assets, net	211,273	236,043
Other assets:
Deferred income taxes	243,394	304,642
Capitalized software costs, net	218,865	217,159
Patents, orbital slots and other licenses, net	70,213	62,200
Other	136,793	115,279
Other assets	669,265	699,280
Accrued and other liabilities:
Collections in excess of revenues and deferred revenues	133,639	131,623
Accrued employee compensation	73,911	108,456
Accrued vacation	43,309	48,097
Warranty reserve, current portion	2,627	2,804
Operating lease liabilities	$ 50,559	$ 49,988
Operating Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration]	Accrued and other liabilities	Accrued and other liabilities
Other	$ 148,599	$ 141,596
Accrued and other liabilities	452,644	482,564
Other liabilities:
Deferred revenues, long-term portion	82,103	88,983
Warranty reserve, long-term portion	2,366	2,548
Satellite performance incentive obligations, long-term portion	16,713	18,651
Deferred income taxes, long-term	13,909	16,869
Other	26,651	26,105
Other liabilities	141,742	153,156
Technology [Member]
Other acquired intangible assets, net:
Other acquired intangible assets, gross	146,866	154,624
Contracts and Customer Relationships [Member]
Other acquired intangible assets, net:
Other acquired intangible assets, gross	159,172	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	31,999	32,463
Other [Member]
Other acquired intangible assets, net:
Other acquired intangible assets, gross	21,021	22,263
Satellites [Member]
Property, equipment and satellites, net:
Property, equipment and satellites, gross	1,047,188	1,059,182
Satellites under Construction [Member]
Property, equipment and satellites, net:
Property, equipment and satellites, gross	2,042,569	1,808,474
Equipment and Software [Member]
Property, equipment and satellites, net:
Property, equipment and satellites, gross	1,765,905	1,676,736
CPE Leased Equipment [Member]
Property, equipment and satellites, net:
Property, equipment and satellites, cost	380,240	395,539
Satellite Ka-band Capacity Obtained under Finance Leases [Member]
Property, equipment and satellites, net:
Property, equipment and satellites, gross	176,348	173,480
Furniture and Fixtures [Member]
Property, equipment and satellites, net:
Property, equipment and satellites, gross	58,426	57,847
Leasehold Improvements [Member]
Property, equipment and satellites, net:
Property, equipment and satellites, gross	149,947	149,982
Buildings [Member]
Property, equipment and satellites, net:
Property, equipment and satellites, gross	12,368	12,440
Land [Member]
Property, equipment and satellites, net:
Property, equipment and satellites, gross	3,766	3,944
Construction in Progress [Member]
Property, equipment and satellites, net:
Property, equipment and satellites, gross	$ 522,009	$ 381,679