Senior Notes and Other Long-Term Debt - Ex-Im Credit Facility (Detail) $ in Millions		12 Months Ended
	Oct. 15, 2025 USD ($)	Mar. 31, 2026 USD ($) Installment
Ex-Im Credit Facility [Member]
Debt Instrument [Line Items]
Credit Facility maximum borrowing capacity		$ 188.7
Amount of qualified ViaSat satellite costs limited to finance		$ 175.8
Percent of qualified ViaSat expenses used to finance		85.00%
The maximum exposure fees under Ex-Im Credit Facility		$ 12.9
Outstanding borrowings under the Credit Facility		$ 188.7
Interest rate on the outstanding borrowings		4.78%
Effective interest rate		7.52%
Required number of installment repayments | Installment		16
Credit facility repayment commenced date		May 30, 2026
Debt maturity date		Nov. 25, 2033
Credit facility description		The Ex-Im Credit Facility contains 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.
Cumulative Ex-Im Credit Facility loan discount		$ 12.9
Former Export Import Credit Facility [Member]
Debt Instrument [Line Items]
Credit Facility maximum borrowing capacity	$ 362.4
Amount of qualified ViaSat satellite costs limited to finance	$ 321.2
Percent of qualified ViaSat expenses used to finance	85.00%
The maximum exposure fees under Ex-Im Credit Facility	$ 41.2
Interest rate on the outstanding borrowings	2.38%
Effective interest rate	4.54%
Line of credit expiration date	Oct. 15, 2025
Cumulative Ex-Im Credit Facility loan discount		42.3
The exposure fees paid under Ex-Im Credit Facility borrowings		6.0
Exposure fees included in the principal		$ 35.3