Senior Notes and Other Long-Term Debt - Components of Long-Term Debt (Parenthetical) (Detail) - Ex-Im Credit Facility [Member] - USD ($) $ in Millions	Jun. 30, 2016	Mar. 31, 2016
Other Long-Term Debt
Exposure fees accrued as of balance sheet date expected to be financed under the Ex-Im Credit Facility	$ 28.4	$ 21.0
Unamortized discount and debt issuance costs on Ex-Im Credit Facility related to the exposure fees expected to be financed under the Ex-Im Credit Facility	$ 25.4	$ 18.7

Accrued debt discount related to exposure fees that are expected to be financed as of balance sheet date.

No definition available.

Name:	vsat_AccruedFinancedDebtDiscount
Namespace Prefix:	vsat_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant