Senior Notes and Other Long-Term Debt - Viasat Revolving Credit Facility (Detail) - Viasat Revolving Credit Facility [Member] $ in Millions	6 Months Ended
	Sep. 30, 2025 USD ($)
Debt Instrument [Line Items]
Credit Facility maximum borrowing capacity	$ 647.5
Maturity date	Aug. 24, 2028
Borrowing availability under the Credit Facility	$ 596.9
Credit Facility interest rate description	Borrowings under the Viasat Revolving Credit Facility bear interest, at the Company’s option, at either (1) the highest of the federal funds rate plus 0.50%, forward-looking term SOFR (as defined in the definitive credit agreement governing the Viasat Revolving Credit Facility) for an interest period of one month plus 1.00%, or the administrative agent’s prime rate as announced from time to time, or (2) forward-looking term SOFR (not to be less than 0.00% per annum), 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 Viasat Revolving Credit Facility contains covenants regarding a maximum total leverage ratio and a minimum interest coverage ratio. In addition, the Viasat Revolving Credit Facility contains covenants that restrict, among other things, the Company’s ability to incur additional debt, grant liens, sell assets, make investments and acquisitions, make capital expenditures, pay dividends and make certain other restricted payments. The Company was in compliance with its covenants under the Viasat Revolving Credit Facility as of September 30, 2025.
Letter of Credit [Member]
Debt Instrument [Line Items]
Credit Facility maximum borrowing capacity	$ 150.0
Standby letters of credit outstanding amount	$ 50.6