The Company and a Summary of Its Significant Accounting Policies - Additional Information (Detail 2) - USD ($)	2 Months Ended	3 Months Ended		12 Months Ended
	May 24, 2024	Mar. 31, 2024	Sep. 30, 2023	Mar. 31, 2024	Mar. 31, 2023	Mar. 31, 2022	Mar. 31, 2021	Dec. 31, 2023
Company And Summary Of Significant Accounting Policies [Line Items]
Capitalized interest expense				$ 227,500,000	$ 159,700,000	$ 102,100,000
Proportion of insured amount to asset net book value			On July 12, 2023, the Company reported a reflector deployment issue that materially impacted the performance of the ViaSat-3 F1 satellite. The Company and the reflector provider conducted a rigorous review of the development and deployment of the affected reflector to determine its impact and potential remedial measures. In connection with the root cause analysis, the Company determined that while the satellite payload is functional, the Company will recover less than 10% of the planned throughput on the ViaSat-3 F1 satellite.
Insurance claim receivables		$ 261,500,000		261,500,000
Insurance recovery proceeds				508,560,000
Capitalized costs, net, related to software developed for resale		723,900,000		723,900,000	646,200,000
Gross capitalized implementation costs incurred in cloud computing arrangements		63,600,000		63,600,000	38,000,000
Accumulated amortization related to capitalized software developed for resale		483,300,000		483,300,000	424,000,000
Accumulated amortization related to capitalized implementation costs incurred in cloud computing arrangements		9,500,000		9,500,000	5,300,000
Total capitalized costs related to patents		3,900,000		3,900,000	3,700,000
Total capitalized costs related to orbital slots and other licenses		117,000,000		117,000,000	77,000,000
Accumulated amortization of patents, orbital slots and other licenses		8,400,000		8,400,000	6,800,000
Debt issuance costs capitalized				53,900,000	0	7,800,000
Capitalized costs, net, related to software developed for resale		240,597,000		240,597,000	222,155,000
Capitalized cost related to software development for resale				77,500,000	59,400,000
Amortization expense of capitalized software development costs				59,100,000	54,400,000	56,500,000
Amortization of capitalized implementation costs incurred in cloud computing arrangements				4,200,000	4,200,000
Goodwill and other intangible assets impairment				0	0	$ 0
Self-insurance liability		$ 6,500,000		6,500,000	$ 7,900,000
Revenue, practical expedient, financing component					true	true	true
Revenue, practical expedient, incremental cost of obtaining contract [true false]					true	true	true
Asset Impairment				$ 0	$ 0	$ 0
Minimum [Member]
Company And Summary Of Significant Accounting Policies [Line Items]
Property, equipment and satellites, estimated useful life (years)		2 years		2 years
Expected capitalized software developed for resale over each of the next five fiscal years, estimated based on annual minimum straight-line amortization		$ 30,000,000		$ 30,000,000
Estimated useful life, years		2 years		2 years
Maximum [Member]
Company And Summary Of Significant Accounting Policies [Line Items]
Property, equipment and satellites, estimated useful life (years)		38 years		38 years
Expected capitalized software developed for resale over each of the next five fiscal years, estimated based on annual minimum straight-line amortization		$ 60,000,000		$ 60,000,000
Estimated useful life, years		20 years		20 years
Maximum [Member] | Software Development Costs [Member]
Company And Summary Of Significant Accounting Policies [Line Items]
Estimated useful life, years		5 years		5 years
Internally Developed Software [Member] | Minimum [Member]
Company And Summary Of Significant Accounting Policies [Line Items]
Property, equipment and satellites, estimated useful life (years)		3 years		3 years
Internally Developed Software [Member] | Maximum [Member]
Company And Summary Of Significant Accounting Policies [Line Items]
Property, equipment and satellites, estimated useful life (years)		7 years		7 years
CPE Leased Equipment [Member]
Company And Summary Of Significant Accounting Policies [Line Items]
Property, equipment and satellites		$ 567,548,000		$ 567,548,000	395,427,000
Accumulated depreciation and amortization		$ 267,400,000		$ 267,400,000	$ 213,600,000
CPE Leased Equipment [Member] | Minimum [Member]
Company And Summary Of Significant Accounting Policies [Line Items]
Property, equipment and satellites, estimated useful life (years)		4 years		4 years
CPE Leased Equipment [Member] | Maximum [Member]
Company And Summary Of Significant Accounting Policies [Line Items]
Property, equipment and satellites, estimated useful life (years)		7 years		7 years
ViaSat-3 F1 satellite [Member]
Company And Summary Of Significant Accounting Policies [Line Items]
Maximum expected recovery % of the planned throughput				10.00%
Satellites [Member]
Company And Summary Of Significant Accounting Policies [Line Items]
Reduction to carrying value including capitalized interest		$ 1,670,000,000		$ 1,670,000,000
Insurance claim receivables								$ 770,000,000
Insurance recovery proceeds		$ 508,600,000
Satellites [Member] | Subsequent Event [Member]
Company And Summary Of Significant Accounting Policies [Line Items]
Insurance recovery proceeds	$ 75,000,000
Satellites [Member] | Selling General and Administrative Expenses [Member]
Company And Summary Of Significant Accounting Policies [Line Items]
Satellite impairment loss, net, including liabilities associated with the termination of certain subcontractor agreements				$ 905,500,000
Satellites [Member] | Minimum [Member]
Company And Summary Of Significant Accounting Policies [Line Items]
Property, equipment and satellites, estimated useful life (years)		7 years		7 years
Satellites [Member] | Maximum [Member]
Company And Summary Of Significant Accounting Policies [Line Items]
Property, equipment and satellites, estimated useful life (years)		17 years		17 years