Composition of Certain Balance Sheet Captions - Composition of Certain Balance Sheet Captions (Detail) - USD ($) $ in Thousands	Jun. 30, 2020	Mar. 31, 2020
Accounts receivable, net:
Accounts receivable, Billed	$ 196,234	$ 260,431
Accounts receivable, Unbilled	82,827	75,661
Allowance for doubtful accounts	(8,625)	(5,394)
Accounts receivable, net	270,436	330,698
Inventories:
Raw materials	91,731	83,353
Work in process	57,612	59,429
Finished goods	163,343	151,634
Inventories	312,686	294,416
Prepaid expenses and other current assets:
Prepaid expenses	81,747	84,872
Other	24,238	31,409
Prepaid expenses and other current assets	105,985	116,281
Property, equipment and satellites, net:
Property, equipment and satellites, gross	4,299,311	4,101,634
Less: accumulated depreciation and amortization	(1,583,489)	(1,514,899)
Property and equipment, net	2,715,822	2,586,735
Other acquired intangible assets, net:
Other acquired intangible assets, gross	213,690	213,281
Less: accumulated amortization	(200,649)	(198,842)
Other acquired intangible assets, net	13,041	14,439
Other assets:
Investment in unconsolidated affiliate	158,714	160,204
Deferred income taxes	286,235	276,331
Capitalized software costs, net	243,943	242,741
Patents, orbital slots and other licenses, net	46,565	39,135
Other	92,269	88,941
Other assets	827,726	807,352
Accrued and other liabilities:
Collections in excess of revenues and deferred revenues	128,079	123,019
Accrued employee compensation	33,570	72,654
Accrued vacation	53,060	48,963
Warranty reserve, current portion	6,189	6,233
Operating lease liabilities	$ 44,035	$ 42,146
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List]	vsat:AccruedAndOtherLiabilitiesCurrent	vsat:AccruedAndOtherLiabilitiesCurrent
Other	$ 94,829	$ 98,175
Accrued and other liabilities	359,762	391,190
Other liabilities:
Deferred revenues, long-term portion	91,260	80,802
Warranty reserve, long-term portion	5,533	5,410
Satellite performance incentive obligations, long-term portion	24,580	24,349
Other	21,156	10,373
Other liabilities	142,529	120,934
Technology [Member]
Other acquired intangible assets, net:
Other acquired intangible assets, gross	89,546	89,228
Contracts and Customer Relationships [Member]
Other acquired intangible assets, net:
Other acquired intangible assets, gross	103,200	103,114
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	5,940	5,940
Other [Member]
Other acquired intangible assets, net:
Other acquired intangible assets, gross	6,404	6,399
Satellites [Member]
Property, equipment and satellites, net:
Property, equipment and satellites, gross	969,952	969,952
Satellites under Construction [Member]
Property, equipment and satellites, net:
Property, equipment and satellites, gross	1,022,474	906,720
Equipment and Software [Member]
Property, equipment and satellites, net:
Property, equipment and satellites, gross	1,324,845	1,229,926
CPE Leased Equipment [Member]
Property, equipment and satellites, net:
Property, equipment and satellites, gross	405,874	399,343
Less: accumulated depreciation and amortization	(172,800)	(165,700)
Satellite Ka-band Capacity Obtained under Finance Leases [Member]
Property, equipment and satellites, net:
Property, equipment and satellites, gross	171,801	171,801
Furniture and Fixtures [Member]
Property, equipment and satellites, net:
Property, equipment and satellites, gross	56,134	54,688
Leasehold Improvements [Member]
Property, equipment and satellites, net:
Property, equipment and satellites, gross	139,320	137,287
Building [Member]
Property, equipment and satellites, net:
Property, equipment and satellites, gross	8,923	8,923
Land [Member]
Property, equipment and satellites, net:
Property, equipment and satellites, gross	2,291	2,291
Construction in Progress [Member]
Property, equipment and satellites, net:
Property, equipment and satellites, gross	$ 197,697	$ 220,703