Composition of Certain Balance Sheet Captions - Composition of Certain Balance Sheet Captions (Detail) - USD ($) $ in Thousands	Mar. 31, 2026	Mar. 31, 2025
Accounts receivable, net:
Accounts receivable, Billed	$ 539,758	$ 539,522
Accounts receivable, Unbilled	227,840	180,871
Allowance for doubtful accounts	(14,168)	(20,841)
Accounts receivable, net	753,430	699,552
Inventories:
Raw materials	108,697	96,893
Work in process	25,054	19,761
Finished goods	147,469	177,289
Inventories	281,220	293,943
Prepaid expenses and other current assets:
Prepaid expenses	179,081	176,694
Other	163,441	105,649
Prepaid expenses and other current assets	342,522	282,343
Property, equipment and satellites, net:
Property, equipment and satellites, gross	12,283,827	11,440,273
Less: accumulated depreciation and amortization	(5,011,190)	(4,034,609)
Property and equipment, net	7,272,637	7,405,664
Other assets:
Deferred income taxes	68,699	160,452
Capitalized software costs, net	316,947	264,492
Patents, orbital slots and other licenses, net	120,194	119,193
Other	273,669	301,641
Other assets	779,509	845,778
Accrued and other liabilities:
Collections in excess of revenues and deferred revenues	292,592	294,034
Accrued employee compensation	207,741	185,556
Operating lease liabilities	$ 60,879	$ 65,310
Operating Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration]	Accrued and other liabilities	Accrued and other liabilities
Interest payable	$ 34,064	$ 52,183
Other	355,916	311,446
Accrued and other liabilities	951,192	908,529
Other liabilities:
Deferred revenues, long-term portion	1,064,261	786,710
Deferred income taxes	1,016,850	1,069,717
Other	298,190	324,726
Other liabilities	2,379,301	2,181,153
Equipment and Software [Member]
Property, equipment and satellites, net:
Property, equipment and satellites, gross	4,298,300	3,837,083
CPE Leased Equipment [Member]
Property, equipment and satellites, net:
Property, equipment and satellites, gross	522,882	525,972
Furniture and Fixtures [Member]
Property, equipment and satellites, net:
Property, equipment and satellites, gross	54,185	58,153
Leasehold Improvements [Member]
Property, equipment and satellites, net:
Property, equipment and satellites, gross	325,087	313,249
Buildings [Member]
Property, equipment and satellites, net:
Property, equipment and satellites, gross	15,062	15,388
Land [Member]
Property, equipment and satellites, net:
Property, equipment and satellites, gross	11,251	19,661
Construction in Progress [Member]
Property, equipment and satellites, net:
Property, equipment and satellites, gross	662,841	722,194
Satellites [Member]
Property, equipment and satellites, net:
Property, equipment and satellites, gross	3,410,741	3,405,067
Satellite Ka-band Capacity Obtained under Finance Leases [Member]
Property, equipment and satellites, net:
Property, equipment and satellites, gross	339,428	338,201
Satellites under Construction [Member]
Property, equipment and satellites, net:
Property, equipment and satellites, gross	$ 2,644,050	$ 2,205,305