Composition of Certain Balance Sheet Captions - Composition of Certain Balance Sheet Captions (Detail) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Dec. 31, 2021	Mar. 31, 2021
Accounts receivable, net:
Accounts receivable, Billed	$ 268,013	$ 172,559
Accounts receivable, Unbilled	102,110	70,785
Allowance for doubtful accounts	(7,110)	(4,692)
Accounts receivable, net	363,013	238,652
Inventories:
Raw materials	103,845	98,338
Work in process	76,184	71,875
Finished goods	173,964	166,459
Inventories	353,993	336,672
Prepaid expenses and other current assets:
Prepaid expenses	102,826	94,405
Other	42,007	25,555
Prepaid expenses and other current assets	144,833	119,960
Property, equipment and satellites, net:
Property, equipment and satellites, gross	5,578,377	4,834,919
Less: accumulated depreciation and amortization	(1,975,196)	(1,784,436)
Property and equipment, net	3,603,181	3,050,483
Other acquired intangible assets, net:
Other acquired intangible assets, gross	380,883	151,549
Less: accumulated amortization	(143,033)	(141,981)
Other acquired intangible assets, net	237,850	9,568
Other assets:
Investment in unconsolidated affiliate		176,938
Deferred income taxes	289,181	273,288
Capitalized software costs, net	223,142	237,100
Patents, orbital slots and other licenses, net	62,553	52,889
Other	107,610	95,212
Other assets	682,486	835,427
Accrued and other liabilities:
Collections in excess of revenues and deferred revenues	180,854	216,594
Accrued employee compensation	83,017	87,153
Accrued vacation	49,134	59,509
Warranty reserve, current portion	5,009	6,693
Operating lease liabilities	50,049	48,896
Other	$ 137,639	$ 113,986
Operating Lease Liability Current Statement Of Financial Position Extensible List	http://www.viasat.com/#AccruedAndOtherLiabilitiesCurrent	http://www.viasat.com/#AccruedAndOtherLiabilitiesCurrent
Accrued And Other Liabilities Current	$ 505,702	$ 532,831
Accrued and other liabilities	505,702	532,831
Other liabilities:
Deferred revenues, long-term portion	89,083	84,654
Warranty reserve, long-term portion	5,699	5,193
Satellite performance incentive obligations, long-term portion	19,568	22,191
Deferred income taxes, long-term	15,160
Other	27,594	25,312
Other liabilities	157,104	137,350
Technology [Member]
Other acquired intangible assets, net:
Other acquired intangible assets, gross	150,559	78,185
Contracts and Customer Relationships [Member]
Other acquired intangible assets, net:
Other acquired intangible assets, gross	167,294	55,161
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	32,042	5,940
Other [Member]
Other acquired intangible assets, net:
Other acquired intangible assets, gross	22,388	3,663
Satellites [Member]
Property, equipment and satellites, net:
Property, equipment and satellites, gross	1,060,656	969,952
Satellites under Construction [Member]
Property, equipment and satellites, net:
Property, equipment and satellites, gross	1,708,565	1,338,408
Equipment and Software [Member]
Property, equipment and satellites, net:
Property, equipment and satellites, gross	1,671,024	1,505,697
CPE Leased Equipment [Member]
Property, equipment and satellites, net:
Property, equipment and satellites, gross	397,416	409,942
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	60,076	57,433
Leasehold Improvements [Member]
Property, equipment and satellites, net:
Property, equipment and satellites, gross	155,603	149,324
Buildings [Member]
Property, equipment and satellites, net:
Property, equipment and satellites, gross	12,405	8,923
Land [Member]
Property, equipment and satellites, net:
Property, equipment and satellites, gross	3,978	2,291
Construction in Progress [Member]
Property, equipment and satellites, net:
Property, equipment and satellites, gross	$ 335,174	$ 219,482