Senior Notes and Other Long-Term Debt - Ex-Im Credit Facility (Detail) - Ex-Im Credit Facility [Member] $ in Millions	12 Months Ended
	Mar. 31, 2024 USD ($) Installment
Debt Instrument [Line Items]
Credit Facility maximum borrowing capacity	$ 362.4
Amount of qualified ViaSat-2 satellite costs limited to finance	$ 321.2
Percent of qualified ViaSat-2 expenses used to finance	85.00%
The maximum exposure fees under Ex-Im Credit Facility	$ 41.2
Outstanding borrowings under the Credit Facility	$ 39.3
Interest rate on the outstanding borrowings	2.38%
Effective interest rate	4.54%
Required number of installment repayments | Installment	16
Credit facility repayment commenced date	Apr. 15, 2018
Debt maturity date	Oct. 15, 2025
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.
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