Senior Notes and Other Long-Term Debt - Former Ex-Im Credit Facility (Detail) - Former Ex-Im Credit Facility [Member] $ in Millions	9 Months Ended
	Dec. 31, 2025 USD ($)
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
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