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Senior Notes and Other Long-Term Debt - Additional Information (Detail)		12 Months Ended
	Mar. 04, 2022 USD ($)	Mar. 31, 2022 USD ($) Installment	Mar. 31, 2021 USD ($)	Jun. 30, 2020 USD ($)	Mar. 31, 2019 USD ($)	Sep. 30, 2017 USD ($)
Debt Instrument [Line Items]
Debt instrument, unamortized discount (premium) and debt issuance costs, net		$ 38,234,000	$ 21,441,000
Term Loan Facility [Member]
Debt Instrument [Line Items]
Credit Facility maximum borrowing capacity	$ 700,000,000.0
Maturity date of the Credit Facility		Mar. 04, 2029
Outstanding borrowings under the Credit Facility		$ 700,000,000.0
Term loan facility quarterly installments required to be repaid		1,750,000
Term loan facility final installment at maturity		$ 654,500,000
Proceeds from line of credit	$ 686,000,000.0
Credit Facility interest rate description		Borrowings under the Term Loan Facility bear interest, at the Company’s option, at either (1) a base rate equal to the greater of the administrative agent’s prime rate as announced from time to time, the federal funds effective rate plus 0.50%, and the forward-looking SOFR term rate administered by CME for a one-month interest period plus 1.00%, subject to a floor of 1.50% for the initial term loans, plus an applicable margin of 3.50%, or (2) the forward-looking SOFR term rate administered by CME for the applicable interest period, subject to a floor of 0.50% for the initial term loans, plus an applicable margin of 4.50%. As of March 31, 2022, the effective interest rate on the Company’s outstanding borrowings under the Term Loan Facility was 5.51%.
Credit facility description		The Term Loan Facility contains covenants that restrict, among other things, the ability of Company and its restricted subsidiaries to incur additional debt, grant liens, sell assets, make investments, pay dividends and make certain other restricted payments. Borrowings under the Term Loan Facility are recorded as current portion of long-term debt and as other long-term debt, net of unamortized discount and debt issuance costs, in the Company’s consolidated financial statements. The Term Loan Facility was issued with an original issue discount of 2.00%, or $14.0 million. The original issue discount and deferred financing cost associated with the issuance of the borrowings under the Term Loan Facility are amortized to interest expense on a straight-line basis over the term of the Term Loan Facility, the results of which are not materially different from the effective interest rate basis.
Debt instrument, unamortized discount (premium) and debt issuance costs, percent		2.00%
Debt instrument, unamortized discount (premium) and debt issuance costs, net		$ 14,000,000.0
Effective interest rate on outstanding borrowings		5.51%
Credit facility repayment commenced date		Sep. 30, 2022
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Credit Facility maximum borrowing capacity		$ 700,000,000.0
Maturity date of the Credit Facility		Jan. 18, 2024
Outstanding borrowings under the Credit Facility		$ 0
Borrowing availability under the Credit Facility		$ 637,000,000.0
Credit Facility interest rate description		Borrowings under the Revolving Credit Facility bear interest, at the Company’s option, at either (1) the highest of the Federal Funds rate plus 0.50%, the Eurodollar rate plus 1.00%, or the administrative agent’s prime rate as announced from time to time, or (2) the Eurodollar rate, plus, in the case of each of (1) and (2), an applicable margin that is based on the Company’s total leverage ratio.
Credit facility description		The Revolving Credit Facility contains financial covenants regarding a maximum total leverage ratio and a minimum interest coverage ratio. In addition, the Revolving Credit Facility contains covenants that restrict, among other things, the Company’s ability to sell assets, make investments and acquisitions, make capital expenditures, grant liens, pay dividends and make certain other restricted payments. The Company was in compliance with its financial covenants under the Revolving Credit Facility as of March 31, 2022.In November 2021, the Company amended the Revolving Credit Facility to, among other matters, permit the consummation of the Inmarsat Transaction and provide additional covenant flexibility following the completion of the Inmarsat Transaction. These amendments will become effective at and are conditional upon the closing of the Inmarsat Transaction. In March 2022, the Company further amended the Revolving Credit Facility to provide additional covenant flexibility and permit the incurrence of the Term Loan Facility.
Ex-Im Credit Facility [Member]
Debt Instrument [Line Items]
Credit Facility maximum borrowing capacity		$ 362,400,000
Outstanding borrowings under the Credit Facility		$ 78,600,000
Credit facility description		The Ex-Im Credit Facility contains financial covenants regarding Viasat’s maximum total leverage ratio and minimum interest coverage ratio. In addition, the Ex-Im Credit Facility contains covenants that restrict, among other things, the Company’s ability to sell assets, make investments and acquisitions, make capital expenditures, grant liens, pay dividends and make certain other restricted payments.
Amount of qualified ViaSat-2 satellite costs limited to finance		$ 321,200,000
Percent of qualified ViaSat-2 expenses used to finance		85.00%
The maximum exposure fees under Ex-Im Credit Facility		$ 41,200,000
Interest rate on the outstanding borrowings		2.38%
Effective interest rate on outstanding borrowings		4.54%
Required number of installment repayments \| Installment		16
Debt maturity date		Oct. 15, 2025
Credit facility repayment commenced date		Apr. 15, 2018
Cumulative Ex-Im Credit Facility loan discount		$ 42,300,000
Exposure fees included in the principal		35,300,000
The exposure fees paid under Ex-Im Credit Facility borrowings		$ 6,000,000.0
2028 Notes [Member]
Debt Instrument [Line Items]
Interest rate on the outstanding borrowings		6.50%
Principal amount of senior notes issued		$ 400,000,000.0		$ 400,000,000.0
Debt maturity year		2028
2028 Notes [Member] \| Debt Instrument, Redemption, Other Period One [Member]
Debt Instrument [Line Items]
Redemption price percentage of Senior Notes		106.50%
Redemption description of Senior Notes		Prior to July 15, 2023, the Company may redeem up to 40% of the 2028 Notes at a redemption price of 106.500% of the principal amount thereof, plus accrued and unpaid interest, if any, thereon to the redemption date, from the net cash proceeds of specified equity offerings.
2028 Notes [Member] \| Debt Instrument, Redemption, Period One [Member]
Debt Instrument [Line Items]
Redemption price percentage of Senior Notes		100.00%
Redemption description of Senior Notes		The Company may also redeem the 2028 Notes prior to July 15, 2023, in whole or in part, at a redemption price equal to 100% of the principal amount thereof plus the applicable premium and any accrued and unpaid interest, if any, thereon to the redemption date. The applicable premium is calculated as the greater of: (i) 1.0% of the principal amount of such 2028 Notes and (ii) the excess, if any, of (a) the present value at such date of redemption of (1) the redemption price of such 2028 Notes on July 15, 2023 plus (2) all required interest payments due on such 2028 Notes through July 15, 2023 (excluding accrued but unpaid interest to the date of redemption), computed using a discount rate equal to the treasury rate (as defined under the indenture governing the 2028 Notes) plus 50 basis points, over (b) the then-outstanding principal amount of such 2028 Notes.
2028 Notes [Member] \| Debt Instrument, Redemption, Period Two [Member]
Debt Instrument [Line Items]
Redemption price percentage of Senior Notes		103.25%
Redemption description of Senior Notes		in whole or in part, at any time during the 12 months beginning on July 15, 2023 at a redemption price of 103.250%
2028 Notes [Member] \| Debt Instrument, Redemption, Period Four [Member]
Debt Instrument [Line Items]
Redemption price percentage of Senior Notes		100.00%
Redemption description of Senior Notes		at any time on or after July 15, 2025 at a redemption price of 100%, in each case plus accrued and unpaid interest, if any, thereon to the redemption date.
2028 Notes [Member] \| Debt Instrument, Redemption, Period Three [Member]
Debt Instrument [Line Items]
Redemption price percentage of Senior Notes		101.625%
Redemption description of Senior Notes		during the 12 months beginning on July 15, 2024 at a redemption price of 101.625%
2028 Notes [Member] \| Change of Control [Member]
Debt Instrument [Line Items]
Redemption price percentage of Senior Notes		101.00%
Redemption description of Senior Notes		In the event a change of control triggering event occurs (as defined in the indenture governing the 2028 Notes), each holder will have the right to require the Company to repurchase all or any part of such holder’s 2028 Notes at a purchase price in cash equal to 101% of the aggregate principal amount of the 2028 Notes repurchased, plus accrued and unpaid interest, if any, to the date of purchase (subject to the right of holders of record on the relevant record date to receive interest due on the relevant interest payment date).
2027 Notes [Member]
Debt Instrument [Line Items]
Interest rate on the outstanding borrowings		5.625%
Principal amount of senior notes issued		$ 600,000,000.0			$ 600,000,000.0
Debt maturity year		2027
2027 Notes [Member] \| Debt Instrument, Redemption, Period Two [Member]
Debt Instrument [Line Items]
Redemption price percentage of Senior Notes		102.813%
Redemption description of Senior Notes		in whole or in part, at any time during the 12 months beginning on April 15, 2022 at a redemption price of 102.813%
2027 Notes [Member] \| Debt Instrument, Redemption, Period Four [Member]
Debt Instrument [Line Items]
Redemption price percentage of Senior Notes		100.00%
Redemption description of Senior Notes		at any time on or after April 15, 2024 at a redemption price of 100%, in each case plus accrued and unpaid interest, if any, thereon to the redemption date.
2027 Notes [Member] \| Debt Instrument, Redemption, Period Three [Member]
Debt Instrument [Line Items]
Redemption price percentage of Senior Notes		101.406%
Redemption description of Senior Notes		during the 12 months beginning on April 15, 2023 at a redemption price of 101.406%
2027 Notes [Member] \| Change of Control [Member]
Debt Instrument [Line Items]
Redemption price percentage of Senior Notes		101.00%
Redemption description of Senior Notes		In the event a change of control triggering event occurs (as defined in the indenture governing the 2027 Notes), each holder will have the right to require the Company to repurchase all or any part of such holder’s 2027 Notes at a purchase price in cash equal to 101% of the aggregate principal amount of the 2027 Notes repurchased, plus accrued and unpaid interest, if any, to the date of purchase (subject to the right of holders of record on the relevant record date to receive interest due on the relevant interest payment date).
2025 Notes [Member]
Debt Instrument [Line Items]
Interest rate on the outstanding borrowings		5.625%
Principal amount of senior notes issued		$ 700,000,000.0				$ 700,000,000.0
Debt maturity year		2025
2025 Notes [Member] \| Debt Instrument, Redemption, Other Period One [Member]
Debt Instrument [Line Items]
Redemption price percentage of Senior Notes		101.406%
2025 Notes [Member] \| Debt Instrument, Redemption, Period One [Member]
Debt Instrument [Line Items]
Redemption price percentage of Senior Notes		100.00%
2025 Notes [Member] \| Debt Instrument, Redemption, Period Two [Member]
Debt Instrument [Line Items]
Redemption price percentage of Senior Notes		101.406%
Redemption description of Senior Notes		in whole or in part, at any time prior to September 15, 2022
2025 Notes [Member] \| Debt Instrument, Redemption, Period Four [Member]
Debt Instrument [Line Items]
Redemption price percentage of Senior Notes		100.00%
Redemption description of Senior Notes			at any time thereafter at a redemption price of 100%, in each case plus accrued and unpaid interest, if any, thereon to the redemption date.
2025 Notes [Member] \| Debt Instrument, Redemption, Period Three [Member]
Debt Instrument [Line Items]
Redemption description of Senior Notes		at a redemption price of 101.406%
2025 Notes [Member] \| Change of Control [Member]
Debt Instrument [Line Items]
Redemption price percentage of Senior Notes		101.00%
Redemption description of Senior Notes		In the event a change of control triggering event occurs (as defined in the indenture governing the 2025 Notes), each holder will have the right to require the Company to repurchase all or any part of such holder’s 2025 Notes at a purchase price in cash equal to 101% of the aggregate principal amount of the 2025 Notes repurchased, plus accrued and unpaid interest, if any, to the date of purchase (subject to the right of holders of record on the relevant record date to receive interest due on the relevant interest payment date).
Letter of Credit [Member]
Debt Instrument [Line Items]
Credit Facility maximum borrowing capacity		$ 150,000,000.0
Standby letters of credit outstanding amount		$ 63,000,000.0