Senior Notes and Other Long-Term Debt - Components of Long-Term Debt (Parenthetical) (Detail) $ in Millions	6 Months Ended
Sep. 30, 2015 USD ($)
Senior Notes
Exposure fees on Ex-Im credit facility expected to be financed under Ex-Im credit facility	$ 8.4
Unamortized discount on Ex-Im Credit Facility related to exposure fees expected to be financed	$ 7.8

Unamortized discount related to exposure fees that are expected to be financed.

No definition available.

Name:	vsat_UnamortizedFinancedDebtDiscount
Namespace Prefix:	vsat_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant