Composition of Certain Balance Sheet Captions - Composition of Certain Balance Sheet Captions (Detail) - USD ($) $ in Thousands	Mar. 31, 2022	Mar. 31, 2021
Accounts receivable, net:
Accounts receivable, Billed	$ 263,383	$ 172,559
Accounts receivable, Unbilled	103,045	70,785
Allowance for doubtful accounts	(7,159)	(4,692)
Accounts receivable, net	359,269	238,652
Inventories:
Raw materials	92,650	98,338
Work in process	64,371	71,875
Finished goods	184,869	166,459
Inventories	341,890	336,672
Prepaid expenses and other current assets:
Prepaid expenses	107,885	94,405
Other	39,969	25,555
Prepaid expenses and other current assets	147,854	119,960
Property, equipment and satellites, net:
Property, equipment and satellites, gross	5,801,692	4,834,919
Less: accumulated depreciation and amortization	(2,059,780)	(1,784,436)
Property and equipment, net	3,741,912	3,050,483
Other assets:
Deferred income taxes	304,642	273,288
Capitalized software costs, net	221,647	237,100
Patents, orbital slots and other licenses, net	62,200	52,889
Investment in unconsolidated affiliate	840	176,938
Other	116,301	95,212
Other assets	705,630	835,427
Accrued and other liabilities:
Collections in excess of revenues and deferred revenues	148,906	216,594
Accrued employee compensation	113,554	87,153
Accrued vacation	51,675	59,509
Warranty reserve, current portion	5,043	6,693
Operating lease liabilities	$ 52,122	$ 48,896
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List]	Accrued and other liabilities	Accrued and other liabilities
Other	$ 145,122	$ 113,986
Accrued and other liabilities	516,422	532,831
Other liabilities:
Deferred revenues, long-term portion	90,151	84,654
Warranty reserve, long-term portion	5,675	5,193
Satellite performance incentive obligations, long-term portion	18,651	22,191
Deferred income taxes	16,869
Other	26,105	25,312
Other liabilities	157,451	137,350
Satellites [Member]
Property, equipment and satellites, net:
Property, equipment and satellites, gross	1,059,182	969,952
Satellites under Construction [Member]
Property, equipment and satellites, net:
Property, equipment and satellites, gross	1,808,474	1,338,408
Equipment and Software [Member]
Property, equipment and satellites, net:
Property, equipment and satellites, gross	1,750,855	1,505,697
CPE Leased Equipment [Member]
Property, equipment and satellites, net:
Property, equipment and satellites, gross	395,539	409,942
Less: accumulated depreciation and amortization	(210,600)
Satellite Ka-band Capacity Obtained under Finance Leases [Member]
Property, equipment and satellites, net:
Property, equipment and satellites, gross	173,480	173,467
Furniture and Fixtures [Member]
Property, equipment and satellites, net:
Property, equipment and satellites, gross	58,602	57,433
Leasehold Improvements [Member]
Property, equipment and satellites, net:
Property, equipment and satellites, gross	151,508	149,324
Building [Member]
Property, equipment and satellites, net:
Property, equipment and satellites, gross	12,440	8,923
Land [Member]
Property, equipment and satellites, net:
Property, equipment and satellites, gross	3,944	2,291
Construction in Progress [Member]
Property, equipment and satellites, net:
Property, equipment and satellites, gross	$ 387,668	$ 219,482